SpringMVC---CRUD实现-阿里云开发者社区

思路分析

搭建环境

逆向生层对应的类（model、mapper.xml、mapper.java）

编写业务逻辑层

编写web层（控制器）

前端页面

一、环境搭建

1.1、导入项目所需依赖(pom.xml)

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>liwen_zyssm</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>liwen_zyssm Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
    <!--添加jar包依赖-->
    <!--1.spring 5.0.2.RELEASE相关-->
    <spring.version>5.0.2.RELEASE</spring.version>
    <!--2.mybatis相关-->
    <mybatis.version>3.4.5</mybatis.version>
    <!--mysql-->
    <mysql.version>5.1.44</mysql.version>
    <!--pagehelper分页jar依赖-->
    <pagehelper.version>5.1.2</pagehelper.version>
    <!--mybatis与spring集成jar依赖-->
    <mybatis.spring.version>1.3.1</mybatis.spring.version>
    <!--3.dbcp2连接池相关 druid-->
    <commons.dbcp2.version>2.1.1</commons.dbcp2.version>
    <commons.pool2.version>2.4.3</commons.pool2.version>
    <!--4.log日志相关-->
    <log4j2.version>2.9.1</log4j2.version>
    <log4j2.disruptor.version>3.2.0</log4j2.disruptor.version>
    <slf4j.version>1.7.13</slf4j.version>
    <!--5.其他-->
    <junit.version>4.12</junit.version>
    <servlet.version>4.0.0</servlet.version>
    <lombok.version>1.18.2</lombok.version>
    <mybatis.ehcache.version>1.1.0</mybatis.ehcache.version>
    <ehcache.version>2.10.0</ehcache.version>
    <redis.version>2.9.0</redis.version>
    <redis.spring.version>1.7.1.RELEASE</redis.spring.version>
    <jackson.version>2.9.3</jackson.version>
    <jstl.version>1.2</jstl.version>
    <standard.version>1.1.2</standard.version>
    <tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
    <commons-fileupload.version>1.3.3</commons-fileupload.version>
    <hibernate-validator.version>5.0.2.Final</hibernate-validator.version>
    <shiro.version>1.3.2</shiro.version>
  </properties>
  <dependencies>
    <!--1.spring相关-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--2.mybatis相关-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <!--pagehelper分页插件jar包依赖-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>${pagehelper.version}</version>
    </dependency>
    <!--mybatis与spring集成jar包依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--mybatis与ehcache整合-->
    <dependency>
      <groupId>org.mybatis.caches</groupId>
      <artifactId>mybatis-ehcache</artifactId>
      <version>${mybatis.ehcache.version}</version>
    </dependency>
    <!--ehcache依赖-->
    <dependency>
      <groupId>net.sf.ehcache</groupId>
      <artifactId>ehcache</artifactId>
      <version>${ehcache.version}</version>
    </dependency>
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>${redis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-redis</artifactId>
      <version>${redis.spring.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <!--3.dbcp2连接池相关-->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-dbcp2</artifactId>
      <version>${commons.dbcp2.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>commons-pool2</artifactId>
          <groupId>org.apache.commons</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.pool2.version}</version>
    </dependency>
    <!--springmvc依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--4.log日志相关依赖-->
    <!-- log4j2日志相关依赖 -->
    <!-- log配置：Log4j2 + Slf4j -->
    <!-- slf4j核心包-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
      <version>${slf4j.version}</version>
      <scope>runtime</scope>
    </dependency>
    <!--核心log4j2jar包-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--用于与slf4j保持桥接-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-slf4j-impl</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--web工程需要包含log4j-web，非web工程不需要-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>${log4j2.version}</version>
      <scope>runtime</scope>
    </dependency>
    <!--需要使用log4j2的AsyncLogger需要包含disruptor-->
    <dependency>
      <groupId>com.lmax</groupId>
      <artifactId>disruptor</artifactId>
      <version>${log4j2.disruptor.version}</version>
    </dependency>
    <!--5.其他-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>${standard.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-jsp-api</artifactId>
      <version>${tomcat-jsp-api.version}</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>${commons-fileupload.version}</version>
    </dependency>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>${hibernate-validator.version}</version>
    </dependency>
    <!--shiro依赖-->
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-core</artifactId>
      <version>${shiro.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-web</artifactId>
      <version>${shiro.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-spring</artifactId>
      <version>${shiro.version}</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>liwen_zyssm</finalName>
    <resources>
      <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>jdbc.properties</include>
          <include>*.xml</include>
        </includes>
      </resource>
    </resources>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven.compiler.plugin.version}</version>
        <configuration>
          <source>${maven.compiler.source}</source>
          <target>${maven.compiler.target}</target>
          <encoding>${project.build.sourceEncoding}</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.2</version>
        <dependencies>
          <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
          </dependency>
        </dependencies>
        <configuration>
          <overwrite>true</overwrite>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

1.2、数据库配置信息

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456

1.3、代码生成插件--配置文件（generatorConfig.xml）

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
    <!-- 引入配置文件 -->
    <properties resource="jdbc.properties"/>
    <!--指定数据库jdbc驱动jar包的位置-->
    <classPathEntry location="D:\\Tools\\MavenHouse\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
    <!-- 一个数据库一个context -->
    <context id="infoGuardian">
        <!-- 注释 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
        </commentGenerator>
        <!-- jdbc连接 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}">
            <!--用于解决重复自动生层xml代码-->
<!--            <property name="nullCatalogMeansCurrent" value="true"/>-->
        </jdbcConnection>
        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 01 指定javaBean生成的位置 -->
        <!-- targetPackage：指定生成的model生成所在的包名 -->
        <!-- targetProject：指定在该项目下所在的路径  -->
        <javaModelGenerator targetPackage="com.liwen.model"
                            targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否对model添加构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否针对string类型的字段在set的时候进行trim调用 -->
            <property name="trimStrings" value="false"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>
        <!-- 02 指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.liwen.mapper"
                         targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>
        <!-- 03 生成XxxMapper接口 -->
        <!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
        <!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
        <!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
        <javaClientGenerator targetPackage="com.liwen.mapper"
                             targetProject="src/main/java" type="XMLMAPPER">
            <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>
        <!-- 配置表信息 -->
        <!-- schema即为数据库名 -->
        <!-- tableName为对应的数据库表 -->
        <!-- domainObjectName是要生成的实体类 -->
        <!-- enable*ByExample是否生成 example类 -->
        <!--<table schema="" tableName="t_book" domainObjectName="Book"-->
        <!--enableCountByExample="false" enableDeleteByExample="false"-->
        <!--enableSelectByExample="false" enableUpdateByExample="false">-->
        <!--&lt;!&ndash; 忽略列，不生成bean 字段 &ndash;&gt;-->
        <!--&lt;!&ndash; <ignoreColumn column="FRED" /> &ndash;&gt;-->
        <!--&lt;!&ndash; 指定列的java数据类型 &ndash;&gt;-->
        <!--&lt;!&ndash; <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> &ndash;&gt;-->
        <!--</table>-->
        <table schema="" tableName="t_oa_user" domainObjectName="User"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
            <!-- 忽略列，不生成bean 字段 -->
            <!-- <ignoreColumn column="FRED" /> -->
            <!-- 指定列的java数据类型 -->
            <!-- <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> -->
        </table>
    </context>
</generatorConfiguration>

1.4、spring与mybatis整合的配置文件 spring-mybatis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--1. 注解式开发 -->
    <!-- 注解驱动 -->
    <context:annotation-config/>
    <!-- 用注解方式注入bean，并指定查找范围：com.javaxl.ssm及子子孙孙包-->
    <context:component-scan base-package="com.liwen"/>
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!--初始连接数-->
        <property name="initialSize" value="10"/>
        <!--最大活动连接数-->
        <property name="maxTotal" value="100"/>
        <!--最大空闲连接数-->
        <property name="maxIdle" value="50"/>
        <!--最小空闲连接数-->
        <property name="minIdle" value="10"/>
        <!--设置为-1时，如果没有可用连接，连接池会一直无限期等待，直到获取到连接为止。-->
        <!--如果设置为N（毫秒），则连接池会等待N毫秒，等待不到，则抛出异常-->
        <property name="maxWaitMillis" value="-1"/>
    </bean>
    <!--4. spring和MyBatis整合 -->
    <!--1) 创建sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 自动扫描XxxMapping.xml文件，**任意路径 -->
        <property name="mapperLocations" value="classpath*:com/liwen/**/mapper/*.xml"/>
        <!-- 指定别名 -->
        <property name="typeAliasesPackage" value="com/liwen/**/model"/>
        <!--配置pagehelper插件-->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <value>
                            helperDialect=mysql
                        </value>
                    </property>
                </bean>
            </array>
        </property>
    </bean>
    <!--2) 自动扫描com/javaxl/ssm/**/mapper下的所有XxxMapper接口(其实就是DAO接口)，并实现这些接口，-->
    <!--   即可直接在程序中使用dao接口，不用再获取sqlsession对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--basePackage 属性是映射器接口文件的包路径。-->
        <!--你可以使用分号或逗号 作为分隔符设置多于一个的包路径-->
        <property name="basePackage" value="com/liwen/**/mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <aop:aspectj-autoproxy/>
</beans>

1.5、spring-context.xml 上下文配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--spring框架与mybatis整合配置文夹加载到spring上下文中-->
    <import resource="spring-mybatis.xml"></import>
</beans>

1.6、spring-mvc-xml: 配置Spring框架的一些关键组件和功能

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
      http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--1) 扫描com.zking.zf及子子孙孙包下的控制器(扫描范围过大，耗时)-->
    <context:component-scan base-package="com.liwen"/>
    <!--2) 此标签默认注册DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter -->
    <mvc:annotation-driven/>
    <!--3) 创建ViewResolver视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar -->
        <property name="viewClass"
                  value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--4) 单独处理图片、样式、js等资源 -->
    <!--     <mvc:resources location="/css/" mapping="/css/**"/>-->
    <!--     <mvc:resources location="/js/" mapping="/js/**"/>-->
    <!--     <mvc:resources location="/static/" mapping="/static/**"/>-->
    <!--处理controller层发送请求到biz，会经过切面的拦截处理-->
    <aop:aspectj-autoproxy/>
</beans>

1.7、配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <display-name>Archetype Created Web Application</display-name>
  <!-- Spring和web项目集成start -->
  <!-- spring上下文配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-context.xml</param-value>
  </context-param>
  <!-- 读取Spring上下文的监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring和web项目集成end -->
  <!-- 中文乱码处理 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <async-supported>true</async-supported>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Spring MVC servlet -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--此参数可以不配置，默认值为：/WEB-INF/springmvc-servlet.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <!--web.xml 3.0的新特性，是否支持异步-->
    <async-supported>true</async-supported>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

1.8、分页所需要的配置

1.8.1、分页工具类

package com.liwen.utils;
import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;
public class PageBean implements Serializable {
  private static final long serialVersionUID = 2422581023658455731L;
  //页码
  private int page=1;
  //每页显示记录数
  private int rows=10;
  //总记录数
  private int total=0;
  //是否分页
  private boolean isPagination=true;
  //上一次的请求路径
  private String url;
  //获取所有的请求参数
  private Map<String,String[]> map;
  public PageBean() {
    super();
  }
  //设置请求参数
  public void setRequest(HttpServletRequest req) {
    String page=req.getParameter("page");
    String rows=req.getParameter("rows");
    String pagination=req.getParameter("pagination");
    this.setPage(page);
    this.setRows(rows);
    this.setPagination(pagination);
    this.url=req.getContextPath()+req.getServletPath();
    this.map=req.getParameterMap();
  }
  public String getUrl() {
    return url;
  }
  public void setUrl(String url) {
    this.url = url;
  }
  public Map<String, String[]> getMap() {
    return map;
  }
  public void setMap(Map<String, String[]> map) {
    this.map = map;
  }
  public int getPage() {
    return page;
  }
  public void setPage(int page) {
    this.page = page;
  }
  public void setPage(String page) {
    if(null!=page&&!"".equals(page.trim()))
      this.page = Integer.parseInt(page);
  }
  public int getRows() {
    return rows;
  }
  public void setRows(int rows) {
    this.rows = rows;
  }
  public void setRows(String rows) {
    if(null!=rows&&!"".equals(rows.trim()))
      this.rows = Integer.parseInt(rows);
  }
  public int getTotal() {
    return total;
  }
  public void setTotal(int total) {
    this.total = total;
  }
  public void setTotal(String total) {
    this.total = Integer.parseInt(total);
  }
  public boolean isPagination() {
    return isPagination;
  }
  public void setPagination(boolean isPagination) {
    this.isPagination = isPagination;
  }
  public void setPagination(String isPagination) {
    if(null!=isPagination&&!"".equals(isPagination.trim()))
      this.isPagination = Boolean.parseBoolean(isPagination);
  }
  /**
   * 获取分页起始标记位置
   * @return
   */
  public int getStartIndex() {
    //(当前页码-1)*显示记录数
    return (this.getPage()-1)*this.rows;
  }
  /**
   * 末页
   * @return
   */
  public int getMaxPage() {
    int totalpage=this.total/this.rows;
    if(this.total%this.rows!=0)
      totalpage++;
    return totalpage;
  }
  /**
   * 下一页
   * @return
   */
  public int getNextPage() {
    int nextPage=this.page+1;
    if(this.page>=this.getMaxPage())
      nextPage=this.getMaxPage();
    return nextPage;
  }
  /**
   * 上一页
   * @return
   */
  public int getPreivousPage() {
    int previousPage=this.page-1;
    if(previousPage<1)
      previousPage=1;
    return previousPage;
  }
  @Override
  public String toString() {
    return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
        + "]";
  }
}

1.8.2、分页助手类

package com.liwen.tag;
import com.liwen.utils.PageBean;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
public class PageTag extends BodyTagSupport{
  private PageBean pageBean;// 包含了所有分页相关的元素
  public PageBean getPageBean() {
    return pageBean;
  }
  public void setPageBean(PageBean pageBean) {
    this.pageBean = pageBean;
  }
  @Override
  public int doStartTag() throws JspException {
//    没有标签体，要输出内容
    JspWriter out = pageContext.getOut();
    try {
      out.print(toHTML());
    } catch (IOException e) {
      e.printStackTrace();
    }
    return super.doStartTag();
  }
  private String toHTML() {
    StringBuffer sb = new StringBuffer();
//    隐藏的form表单---这个就是上一次请求下次重新发的奥义所在
//    上一次请求的URL
    sb.append("<form action='"+pageBean.getUrl()+"' id='pageBeanForm' method='get'>");
    sb.append(" <input type='hidden' name='page'>");
//    上一次请求的参数
    Map<String, String[]> paramMap = pageBean.getMap();
    if(paramMap != null && paramMap.size() > 0) {
      Set<Entry<String, String[]>> entrySet = paramMap.entrySet();
      for (Entry<String, String[]> entry : entrySet) {
//        参数名
        String key = entry.getKey();
//        参数值
        for (String value : entry.getValue()) {
//          上一次请求的参数，再一次组装成了新的Form表单
//          注意：page参数每次都会提交，我们需要避免
          if(!"page".equals(key)) {
            sb.append(" <input type='hidden' name='"+key+"' value='"+value+"' >");
          }
        }
      }
    }
    sb.append("</form>");
//    分页条
    sb.append("<ul class='pagination justify-content-center'>");
    sb.append(" <li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");
    sb.append(" href='javascript:gotoPage(1)'>首页</a></li>");
    sb.append(" <li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");
    sb.append(" href='javascript:gotoPage("+pageBean.getPreivousPage()+")'>&lt;</a></li>");// less than 小于号
//    sb.append(" <li class='page-item'><a class='page-link' href='#'>1</a></li>");
//    sb.append(" <li class='page-item'><a class='page-link' href='#'>2</a></li>");
    sb.append(" <li class='page-item active'><a class='page-link' href='#'>"+pageBean.getPage()+"</a></li>");
    sb.append(" <li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getNextPage()+")'>&gt;</a></li>");
    sb.append(" <li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a></li>");
    sb.append(" <li class='page-item go-input'><b>到第</b><input class='page-link'");
    sb.append(" type='text' id='skipPage' name='' /><b>页</b></li>");
    sb.append(" <li class='page-item go'><a class='page-link'");
    sb.append(" href='javascript:skipPage()'>确定</a></li>");
    sb.append(" <li class='page-item'><b>共"+pageBean.getTotal()+"条</b></li>");
    sb.append("</ul>");
//    分页执行的JS代码
    sb.append("<script type='text/javascript'>");
    sb.append(" function gotoPage(page) {");
    sb.append("   document.getElementById('pageBeanForm').page.value = page;");
    sb.append("   document.getElementById('pageBeanForm').submit();");
    sb.append(" }");
    sb.append(" function skipPage() {");
    sb.append("   var page = document.getElementById('skipPage').value;");
    sb.append("   if (!page || isNaN(page) || parseInt(page) < 1 || parseInt(page) > "+pageBean.getMaxPage()+") {");
    sb.append("     alert('请输入1~"+pageBean.getMaxPage()+"的数字');");
    sb.append("     return;");
    sb.append("   }");
    sb.append("   gotoPage(page);");
    sb.append(" }");
    sb.append("</script>");
    return sb.toString();
  }
}

1.8.3、tld文件

<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://java.sun.com/xml/ns/j2ee"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
        version="2.0">
    <description>liwen 1.1 core library</description>
    <display-name>liwen core</display-name>
    <tlib-version>1.1</tlib-version>
    <short-name>liwen</short-name>
    <uri>http://jsp.veryedu.cn</uri>
    <tag>
        <name>page</name>
        <tag-class>com.liwen.tag.PageTag</tag-class>
        <body-content>JSP</body-content>
        <attribute>
            <name>pageBean</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
</taglib>

二、编写业务逻辑层（增删改查方法）

因为基本的增删改查都是插件自动生成的了，所以不需要再写了，这里加一个查询单个的sql

  <select id="listPager" resultMap="BaseResultMap" parameterType="com.liwen.model.User" >
    select
    <include refid="Base_Column_List" />
    from t_oa_user
    <where>
      <if test="name!=null">
        and name like concat('%',#{name},'%')
      </if>
    </where>
  </select>

这里加了接口自然也是要加的

List<User> listPager(User user);

业务逻辑层接口

package com.liwen.biz;
import com.liwen.model.User;
import com.liwen.utils.PageBean;
import java.util.List;
public interface UserBiz {
    int deleteByPrimaryKey(Long id);
    int insert(User record);
    int insertSelective(User record);
    User selectByPrimaryKey(Long id);
    int updateByPrimaryKeySelective(User record);
    int updateByPrimaryKey(User record);
    List<User> listPager(User user, PageBean page);
}

实现接口

package com.liwen.biz.impl;
import com.liwen.biz.UserBiz;
import com.liwen.mapper.UserMapper;
import com.liwen.model.User;
import com.liwen.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
 * @author liwen
 */
@Service
public class UserBizImpl implements UserBiz {
    @Autowired
    private UserMapper userMapper;
    @Override
    public int deleteByPrimaryKey(Long id) {
        return userMapper.deleteByPrimaryKey(id);
    }
    @Override
    public int insert(User record) {
        return userMapper.insert(record);
    }
    @Override
    public int insertSelective(User record) {
        return userMapper.insertSelective(record);
    }
    @Override
    public User selectByPrimaryKey(Long id) {
        return userMapper.selectByPrimaryKey(id);
    }
    @Override
    public int updateByPrimaryKeySelective(User record) {
        return userMapper.updateByPrimaryKeySelective(record);
    }
    @Override
    public int updateByPrimaryKey(User record) {
        return userMapper.updateByPrimaryKey(record);
    }
    @Override
    public List<User> listPager(User user, PageBean page) {
        return userMapper.listPager(user);
    }
}

编写切面

如果需要分页则需进行代码，在spring-mvc-xml文件中已经配置了aop代理，如果注释掉将不会进行分页

package com.liwen.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.liwen.utils.PageBean;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import java.util.List;
/**
 * @author liwen
 */
@Aspect //代表当前为切面类
@Component //代表当前类交给spring进行管理
public class PageAspect {
    @Around("execution(* *..*Biz.*Pager(..))")
    public Object invoke(ProceedingJoinPoint args) throws Throwable {
        PageBean pageBean = null;
        //获取目标方法的所有参数
        Object[] args1 = args.getArgs();
        for (Object param:args1) {
            if (param instanceof PageBean){
                pageBean = (PageBean) param;
                break;
            }
        }
        if(pageBean!=null && pageBean.isPagination())
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        //执行目标方法
        Object proceed = args.proceed();
        if(pageBean!=null && pageBean.isPagination()){
            PageInfo info = new PageInfo((List) proceed);
            pageBean.setTotal((int) info.getTotal());
        }
        return proceed;
    }
}

三、编写web控制层

package com.liwen.web;
import com.liwen.biz.UserBiz;
import com.liwen.model.User;
import com.liwen.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * @author liwen
 */
@Controller
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserBiz userBiz;
    /*新增方法*/
    @RequestMapping("/add")
    public String save(User user, HttpServletRequest request) {
        userBiz.insertSelective(user);
        return "redirect:list";
    }
    /*删除方法*/
    @RequestMapping("/del/{id}")
    public String del(@PathVariable("id") Long id, HttpServletRequest request) {
        userBiz.deleteByPrimaryKey(id);
        return "redirect:/users/list";
    }
    /*修改方法*/
    @RequestMapping("/edit")
    public String edit(User user, HttpServletRequest request) {
        userBiz.updateByPrimaryKeySelective(user);
        return "redirect:list";
    }
    /*查询方法*/
    @GetMapping("/list")
    public ModelAndView list(User user, HttpServletRequest request) {
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        List<User> users = userBiz.listPager(user, pageBean);
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("users", users);
        modelAndView.addObject("pageBean", pageBean);
        modelAndView.setViewName("user/list");
        return modelAndView;
    }
    /*数据回显*/
    @RequestMapping("/preSave")
    public String preSave(User user, HttpServletRequest request) {
        if (user != null && user.getId() != null && user.getId() != 0) {
            User u = userBiz.selectByPrimaryKey(user.getId());
            request.setAttribute("u", u);
        }
        return "user/edit";
    }
}

四、前端页面

主界面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="z" uri="http://jsp.veryedu.cn" %>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <link
            href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
            rel="stylesheet">
    <script
            src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
    <base href="${pageContext.request.contextPath }">
    <title>博客列表</title>
    <style type="text/css">
        .page-item input {
            padding: 0;
            width: 40px;
            height: 100%;
            text-align: center;
            margin: 0 6px;
        }
        .page-item input, .page-item b {
            line-height: 38px;
            float: left;
            font-weight: 400;
        }
        .page-item.go-input {
            margin: 0 10px;
        }
    </style>
</head>
<body>
<form class="form-inline"
      action="/users/list" method="post">
    <div class="form-group mb-2">
        <input type="text" class="form-control-plaintext" name="name"
               placeholder="请输入用户名称">
        <!-- 不想分页 -->
        <!-- <input name="rows" value="20" type="hidden"> -->
        <%--<input name="pagination" value="false" type="hidden">--%>
    </div>
    <button type="submit" class="btn btn-primary mb-2">查询</button>
    <a class="btn btn-primary mb-2" href="/users/preSave">新增</a>
</form>
<table class="table table-striped">
    <thead>
    <tr>
        <th scope="col">用户ID</th>
        <th scope="col">用户名</th>
        <th scope="col">账号</th>
        <th scope="col">密码</th>
        <th scope="col">权限</th>
    </tr>
    </thead>
    <tbody>
    <c:forEach var="u" items="${users }">
        <tr>
            <td>${u.id }</td>
            <td>${u.name }</td>
            <td>${u.loginname }</td>
            <td>${u.pwd }</td>
            <td>${u.rid }</td>
            <td>
                <a href="/users/preSave?id=${u.id}">修改</a>
                <a href="/users/del/${u.id}">删除</a>
            </td>
        </tr>
    </c:forEach>
    </tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

预编辑界面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户编辑、新增公共页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/${empty u ? 'users/add' : 'users/edit'}" method="post">
    用户id:<input type="text" name="id" value="${u.id }"><br>
    用户名:<input type="text" name="name" value="${u.name }"><br>
    账号:<input type="text" name="loginname" value="${u.loginname }"><br>
    密码:<input type="text" name="pwd" value="${u.pwd }"><br>
    权限:<input type="text" name="rid" value="${u.rid }"><br>
    <input type="submit">
</form>
</body>
</html>

SpringMVC---CRUD实现

思路分析

一、环境搭建

1.1、导入项目所需依赖(pom.xml)

1.2、数据库配置信息

1.3、代码生成插件--配置文件（generatorConfig.xml）

1.4、spring与mybatis整合的配置文件 spring-mybatis.xml

1.5、spring-context.xml 上下文配置文件

1.6、spring-mvc-xml: 配置Spring框架的一些关键组件和功能

1.7、配置web.xml

1.8、分页所需要的配置

1.8.1、分页工具类

1.8.2、分页助手类

1.8.3、tld文件

二、编写业务逻辑层（增删改查方法）

三、编写web控制层

四、前端页面

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