SpringMVC之CRUD(增删改查)

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简介: SpringMVC之CRUD(增删改查)
  • SpringMVC之CRUD(增删改查)

数据库

# 创建表
CREATE TABLE Student (
    sid INT PRIMARY KEY,
    sname VARCHAR(50),
    sage INT,
    spic VARCHAR(255));
给student表插入数据
INSERT INTO Student (sid, sname, sage, spic)
VALUES 
(1, 'John Do', 25, 'path/to/image1.jpg'),
(2, 'Jane Smith', 30, 'path/to/image2.jpg'),
(3, 'Alex Johnson', 35, 'path/to/image3.jpg'),
(4, 'Emily Davis', 28, 'path/to/image4.jpg'),
(5, 'Michael Wilson', 40, 'path/to/image5.jpg'),
(6, 'Sarah Brown', 37, 'path/to/image6.jpg'),
(7, 'David Lee', 45, 'path/to/image7.jpg'),
(8, 'Carolyn Taylor', 22, 'path/to/image8.jpg');

公共页面跳转,配置。。。

package com.zlj.web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * @author zlj
 * @create 2023-09-07 14:50
 * 处理页面跳转
 * 以往
 *<a href="clz/preSave">新增</a>
 *<a href="book/preSave">新增</a>
 *<a href="order/preSave">新增</a>
 * 现在
 *<a href="page/clz/preSave">新增</a>
 *<a href="page/book/preSave">新增</a>
 *<a href="page/order/preSave">新增</a>
 */
@Controller
public class pageController {
@RequestMapping("/page/{page}")
    public String toPage(@PathVariable("page") String page){
    return page;
}
@RequestMapping("/page/{dir}{page}")
    public String toDirPage(
            @PathVariable("dir") String dir,
            @PathVariable("page") String page){
    return dir + "/" + page;
    }
//    @RequestMapping("/order/presave")
//    public String orderpre(){
//        return "/order/presave";
//    }
//    @RequestMapping("/clz/presave")
//    public String clzpre(){
//        return "/clz/presave";
//    }
}
package com.zlj.util;
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
        + "]";
  }
}
package com.zlj.util;
import com.fasterxml.jackson.databind.ObjectMapper;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
public class ResponseUtil {
  public static void write(HttpServletResponse response,Object o)throws Exception{
    response.setContentType("text/html;charset=utf-8");
    PrintWriter out=response.getWriter();
    out.println(o.toString());
    out.flush();
    out.close();
  }
  public static void writeJson(HttpServletResponse response,Object o)throws Exception{
    ObjectMapper om = new ObjectMapper();
//    om.writeValueAsString(o)代表了json串
    write(response, om.writeValueAsString(o));
  }
}
//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:\\software\\apache-maven-3.5.0-bin\\apache-maven-3.5.0-bin\\apache-maven-3.5.0\\conf\\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}"/>
        <!-- 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.zlj.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.zlj.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.zlj.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="student" domainObjectName="Stu"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>
    </context>
</generatorConfiguration>
//jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://47.100.191.44:3308/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=test01
jdbc.password=test01
//log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- status : 指定log4j本身的打印日志的级别.ALL< Trace < DEBUG < INFO < WARN < ERROR
  < FATAL < OFF。 monitorInterval : 用于指定log4j自动重新配置的监测间隔时间,单位是s,最小是5s. -->
<Configuration status="WARN" monitorInterval="30">
    <Properties>
        <!-- 配置日志文件输出目录 ${sys:user.home} -->
        <Property name="LOG_HOME">/root/workspace/lucenedemo/logs</Property>
        <property name="ERROR_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/error</property>
        <property name="WARN_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/warn</property>
        <property name="PATTERN">%d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n</property>
    </Properties>
    <Appenders>
        <!--这个输出控制台的配置 -->
        <Console name="Console" target="SYSTEM_OUT">
            <!-- 控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
            <ThresholdFilter level="trace" onMatch="ACCEPT"
                             onMismatch="DENY" />
            <!-- 输出日志的格式 -->
            <!-- %d{yyyy-MM-dd HH:mm:ss, SSS} : 日志生产时间 %p : 日志输出格式 %c : logger的名称
                %m : 日志内容,即 logger.info("message") %n : 换行符 %C : Java类名 %L : 日志输出所在行数 %M
                : 日志输出所在方法名 hostName : 本地机器名 hostAddress : 本地ip地址 -->
            <PatternLayout pattern="${PATTERN}" />
        </Console>
        <!--文件会打印出所有信息,这个log每次运行程序会自动清空,由append属性决定,这个也挺有用的,适合临时测试用 -->
        <!--append为TRUE表示消息增加到指定文件中,false表示消息覆盖指定的文件内容,默认值是true -->
        <File name="log" fileName="logs/test.log" append="false">
            <PatternLayout
                    pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </File>
        <!-- 这个会打印出所有的info及以下级别的信息,每次大小超过size, 则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩,作为存档 -->
        <RollingFile name="RollingFileInfo" fileName="${LOG_HOME}/info.log"
                     filePattern="${LOG_HOME}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log">
            <!--控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
            <ThresholdFilter level="info" onMatch="ACCEPT"
                             onMismatch="DENY" />
            <PatternLayout
                    pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
            <Policies>
                <!-- 基于时间的滚动策略,interval属性用来指定多久滚动一次,默认是1 hour。 modulate=true用来调整时间:比如现在是早上3am,interval是4,那么第一次滚动是在4am,接着是8am,12am...而不是7am. -->
                <!-- 关键点在于 filePattern后的日期格式,以及TimeBasedTriggeringPolicy的interval, 日期格式精确到哪一位,interval也精确到哪一个单位 -->
                <!-- log4j2的按天分日志文件 : info-%d{yyyy-MM-dd}-%i.log -->
                <TimeBasedTriggeringPolicy interval="1"
                                           modulate="true" />
                <!-- SizeBasedTriggeringPolicy:Policies子节点, 基于指定文件大小的滚动策略,size属性用来定义每个日志文件的大小. -->
                <!-- <SizeBasedTriggeringPolicy size="2 kB" /> -->
            </Policies>
        </RollingFile>
        <RollingFile name="RollingFileWarn" fileName="${WARN_LOG_FILE_NAME}/warn.log"
                     filePattern="${WARN_LOG_FILE_NAME}/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log">
            <ThresholdFilter level="warn" onMatch="ACCEPT"
                             onMismatch="DENY" />
            <PatternLayout
                    pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
            <Policies>
                <TimeBasedTriggeringPolicy />
                <SizeBasedTriggeringPolicy size="2 kB" />
            </Policies>
            <!-- DefaultRolloverStrategy属性如不设置,则默认为最多同一文件夹下7个文件,这里设置了20 -->
            <DefaultRolloverStrategy max="20" />
        </RollingFile>
        <RollingFile name="RollingFileError" fileName="${ERROR_LOG_FILE_NAME}/error.log"
                     filePattern="${ERROR_LOG_FILE_NAME}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd-HH-mm}-%i.log">
            <ThresholdFilter level="error" onMatch="ACCEPT"
                             onMismatch="DENY" />
            <PatternLayout
                    pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
            <Policies>
                <!-- log4j2的按分钟 分日志文件 : warn-%d{yyyy-MM-dd-HH-mm}-%i.log -->
                <TimeBasedTriggeringPolicy interval="1"
                                           modulate="true" />
                <!-- <SizeBasedTriggeringPolicy size="10 MB" /> -->
            </Policies>
        </RollingFile>
    </Appenders>
    <!--然后定义logger,只有定义了logger并引入的appender,appender才会生效 -->
    <Loggers>
        <!--过滤掉spring和mybatis的一些无用的DEBUG信息 -->
        <logger name="org.springframework" level="INFO"></logger>
        <logger name="org.mybatis" level="INFO"></logger>
        <!-- 第三方日志系统 -->
        <logger name="org.springframework" level="ERROR" />
        <logger name="org.hibernate" level="ERROR" />
        <logger name="org.apache.struts2" level="ERROR" />
        <logger name="com.opensymphony.xwork2" level="ERROR" />
        <logger name="org.jboss" level="ERROR" />
        <!-- 配置日志的根节点 -->
        <root level="all">
            <appender-ref ref="Console" />
            <appender-ref ref="RollingFileInfo" />
            <appender-ref ref="RollingFileWarn" />
            <appender-ref ref="RollingFileError" />
        </root>
    </Loggers>
</Configuration>
//spring-content.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--    String框架与mybatis整合的配置文件加载到Spring的上下文中-->
    <import resource="classpath:spring-mybatis.xml"></import>
</beans>
//spring-mvc.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:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.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.zlj"/>
    <!--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="WEB-INF/images/" mapping="/images/**"/>  -->
    <mvc:resources location="/static/" mapping="/static/**"/>
<!--    处理controller层发送请求到biz,会经过切面拦截处理-->
    <aop:aspectj-autoproxy/>
</beans>
//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.zlj"/>
    <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/zlj/**/mapper/*.xml"/>
        <!-- 指定别名 -->
        <property name="typeAliasesPackage" value="com/zlj/**/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/zlj/**/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>
//header.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<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>
    <title>学生信息</title>
    <base href="${pageContext.request.contextPath }"/>
    <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>
<%
    request.setAttribute("ctx",request.getContextPath());
%>
</body>
</html>
//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-content.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>
//zlj.tld
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    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>zlj 1.1 core library</description>
  <display-name>zlj core</display-name>
  <tlib-version>1.1</tlib-version>
  <short-name>zlj</short-name>
  <uri>http://jsp.veryedu.cn</uri>
  <tag>
    <name>page</name>
    <tag-class>com.zlj.tag.PageTag</tag-class>
    <body-content>JSP</body-content>
    <attribute>
        <name>pageBean</name>
        <required>true</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
</taglib>

后台接口准备

ssm的增删改查

1.先逆向生成对应的类(model,mapper.xml,mapper.java)

2.biz层

3.web层(依托于自定义mvc的分页标签==>pom.xml)

4.前端

package com.zlj.model;
import lombok.ToString;
@ToString
public class Stu {
    private Integer sid;
    private String sname;
    private Integer sage;
    private String spic="暂无图片";
    public Stu(Integer sid, String sname, Integer sage, String spic) {
        this.sid = sid;
        this.sname = sname;
        this.sage = sage;
        this.spic = spic;
    }
    public Stu() {
        super();
    }
    public Integer getSid() {
        return sid;
    }
    public void setSid(Integer sid) {
        this.sid = sid;
    }
    public String getSname() {
        return sname;
    }
    public void setSname(String sname) {
        this.sname = sname;
    }
    public Integer getSage() {
        return sage;
    }
    public void setSage(Integer sage) {
        this.sage = sage;
    }
    public String getSpic() {
        return spic;
    }
    public void setSpic(String spic) {
        this.spic = spic;
    }
}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zlj.mapper.StuMapper" >
  <resultMap id="BaseResultMap" type="com.zlj.model.Stu" >
    <constructor >
      <idArg column="sid" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="sname" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="sage" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="spic" jdbcType="VARCHAR" javaType="java.lang.String" />
    </constructor>
  </resultMap>
  <sql id="Base_Column_List" >
    sid, sname, sage, spic
  </sql>
  <select id="selectByCon" resultType="com.zlj.model.Stu" parameterType="com.zlj.model.Stu" >
    select
    <include refid="Base_Column_List" />
    from student
   <where>
    <if test="sname != null">
     and sname like concat('%' , #{sname} , '%')
    </if>
    </where>
  </select>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select
    <include refid="Base_Column_List" />
    from student
    where sid = #{sid,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from student
    where sid = #{sid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.zlj.model.Stu" >
    insert into student (sid, sname, sage,
      spic)
    values (#{sid,jdbcType=INTEGER}, #{sname,jdbcType=VARCHAR}, #{sage,jdbcType=INTEGER},
      #{spic,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.zlj.model.Stu" >
    insert into student
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="sid != null" >
        sid,
      </if>
      <if test="sname != null" >
        sname,
      </if>
      <if test="sage != null" >
        sage,
      </if>
      <if test="spic != null" >
        spic,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="sid != null" >
        #{sid,jdbcType=INTEGER},
      </if>
      <if test="sname != null" >
        #{sname,jdbcType=VARCHAR},
      </if>
      <if test="sage != null" >
        #{sage,jdbcType=INTEGER},
      </if>
      <if test="spic != null" >
        #{spic,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.zlj.model.Stu" >
    update student
    <set >
      <if test="sname != null" >
        sname = #{sname,jdbcType=VARCHAR},
      </if>
      <if test="sage != null" >
        sage = #{sage,jdbcType=INTEGER},
      </if>
      <if test="spic != null" >
        spic = #{spic,jdbcType=VARCHAR},
      </if>
    </set>
    where sid = #{sid,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.zlj.model.Stu" >
    update student
    set sname = #{sname,jdbcType=VARCHAR},
      sage = #{sage,jdbcType=INTEGER},
      spic = #{spic,jdbcType=VARCHAR}
    where sid = #{sid,jdbcType=INTEGER}
  </update>
</mapper>
package com.zlj.mapper;
import com.zlj.model.Stu;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface StuMapper {
    int deleteByPrimaryKey(Integer sid);
    int insert(Stu record);
    int insertSelective(Stu record);
    Stu selectByPrimaryKey(Integer sid);
    int updateByPrimaryKeySelective(Stu record);
    int updateByPrimaryKey(Stu record);
    List<Stu> selectByCon(Stu stu);
}
package com.zlj.biz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import java.util.List;
/**
 * @author zlj
 * @create 2023-09-07 17:09
 */
public interface StuBiz {
    int deleteByPrimaryKey(Integer sid);
    int insert(Stu record);
    int insertSelective(Stu record);
    Stu selectByPrimaryKey(Integer sid);
    int updateByPrimaryKeySelective(Stu record);
    int updateByPrimaryKey(Stu record);
    List<Stu> ListPager(Stu stu, PageBean PageBean);
}
package com.zlj.biz.Impl;
import com.zlj.biz.StuBiz;
import com.zlj.mapper.StuMapper;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
 * @author zlj
 * @create 2023-09-08 14:52
 */
@Service
public class StuBizImpl implements StuBiz {
@Autowired
private StuMapper stuMapper;
    @Override
    public int deleteByPrimaryKey(Integer sid) {
        return stuMapper.deleteByPrimaryKey(sid);
    }
    @Override
    public int insert(Stu record) {
        return stuMapper.insert(record);
    }
    @Override
    public int insertSelective(Stu record) {
        return stuMapper.insertSelective(record);
    }
    @Override
    public Stu selectByPrimaryKey(Integer sid) {
        return stuMapper.selectByPrimaryKey(sid);
    }
    @Override
    public int updateByPrimaryKeySelective(Stu record) {
        return stuMapper.updateByPrimaryKeySelective(record);
    }
    @Override
    public int updateByPrimaryKey(Stu record) {
        return stuMapper.updateByPrimaryKey(record);
    }
    @Override
    public List<Stu> ListPager(Stu stu, PageBean pageBean) {
        return stuMapper.selectByCon(stu);
    }
}
package com.zlj.web;
import com.zlj.biz.StuBiz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * @author zlj
 * @create 2023-09-08 16:55
 */
@Controller
@RequestMapping("/stu")
public class StuController {
    @Autowired
    private StuBiz stuBiz;
    //    增
    @RequestMapping("/add")
    public String add(Stu stu,HttpServletRequest request) {
        int i = stuBiz.insert(stu);
        return "redirect:list";
    }
    //            删
    @RequestMapping("/del/{sid}")
    public String del(@PathVariable("sid") Integer sid) {
        stuBiz.deleteByPrimaryKey(sid);
        return "redirect:/stu/list";
    }
//        改
@RequestMapping("/edit")
public String edit(Stu stu) {
    stuBiz.updateByPrimaryKeySelective(stu);
    return "redirect:list";
}
//                查
    @RequestMapping("/list")
    public String list(Stu stu, HttpServletRequest request) {
        //stu是用来接收前台传递后台的参数
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        List<Stu> stus = stuBiz.ListPager(stu, pageBean);
        request.setAttribute("lst", stus);
        request.setAttribute("pageBean", pageBean);
//      WEB-INF/jsp/stu/list.jsp
        return "stu/list";
    }
    //数据回显
    @RequestMapping("/preSave")
    public String preSave(Stu stu, Model model) {
        if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
            Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
            model.addAttribute("s", s);
        }
        return "stu/edit";
    }
}
<%@ page language="java"
         pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>博客的编辑界面</title>
</head>
<body>
<form action="${ctx }${empty s ? 'add' : 'edit'}" method="post">
    学生id:<input type="text" name="sid" value="${s.sid }"><br>
    学生姓名:<input type="text" name="sname" value="${s.sname }"><br>
    学生年龄:<input type="text" name="sage" value="${s.sage }"><br>
    学生图片:<input type="text" name="spic" value="${s.spic }"><br>
    <input type="submit">
</form>
</body>
</html>
//list.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>学生信息</title>
</head>
<body>
<form class="form-inline"
      action="${ctx}/stu/list" method="post">
    <div class="form-group mb-2">
        <input type="text" class="form-control-plaintext" name="sname"
               placeholder="请输入学生姓名">
        <!--      <input name="rows" value="20" type="hidden"> -->
        <!-- 不想分页 -->
        <%--        <input name="pagination" value="false" type="hidden">--%>
    </div>
    <button type="submit" class="btn btn-primary mb-2">查询</button>
    <a class="btn btn-primary mb-2" href="${ctx}/stu/preSave">新增</a>
</form>
<table class="table table-striped">
    <thead>
    <tr>
        <th scope="col">学生id</th>
        <th scope="col">学生姓名</th>
        <th scope="col">学生年龄</th>
        <th scope="col">学生图片</th>
        <th scope="col">操作</th>
    </tr>
    </thead>
    <tbody>
    <c:forEach  var="s" items="${lst }">
        <tr>
            <td>${s.sid }</td>
            <td>${s.sname }</td>
            <td>${s.sage }</td>
            <td>${s.spic }</td>
            <td>
                <a href="${ctx}/stu/preSave?sid=${s.sid}">修改</a>
                <a href="${ctx}/stu/del/${s.sid}">删除</a>
            </td>
        </tr>
    </c:forEach>
    </tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>
<%--
  Created by IntelliJ IDEA.
  User: 朱
  Date: 2023/9/8
  Time: 23:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
博客列表
</body>
</html>

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