SSM是企业中广泛应用的框架。大家再熟练地使用SSM进行业务逻辑开发的时候，也被它大量的xml配置困扰。今
天快速优雅的使用SpringBoot实现简易的SSM工程。废话不多说，come on
开发工具idea
1.创建一个web工程，pom.xml中加入如下配置：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--使用jsp页面--> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> </resources> </build>
2.工程结构
3.数据库和实体类
数据库使用mysql，创建部门表dept，表结构很简单，id主键和name部门名称。
4.dao层
dao的代码我们演示两种方式，一种使用传统的Mapper映射文件，一种使用注解编写sql:
package com.test.springboot.ssm.dao; import com.test.springboot.ssm.pojo.Dept; import org.apache.ibatis.annotations.Insert; import org.apache.ibatis.annotations.Options; import java.util.List; public interface DeptDAO { //查询列表，演示使用传统的mapper映射文件 List<Dept> getDeltList(); //插入，演示使用注解编写sql，省略xml配置 @Insert("insert into DEPT(NAME) values(#{name})") @Options(useGeneratedKeys = true, keyProperty = "id", keyColumn = "ID") void addDept(String name); } mapper映射文件如下 <?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.test.springboot.ssm.dao.DeptDAO"> <resultMap id="deptMap" type="Dept"> <id property="id" column="ID"/> <result property="name" column="NAME"/> </resultMap> <select id="getDeltList" resultMap="deptMap"> select ID,NAME from DEPT </select> </mapper>
注意mapper的namespace是DAO接口的全路径，mapper中语句的id与DAO接口中的方法名是一致的
5.service层
接口:
package com.test.springboot.ssm.service; import com.test.springboot.ssm.pojo.Dept; import java.util.List; public interface DeptService { List<Dept> getDeltList(); void addDept(String name); } 实现类; package com.test.springboot.ssm.service.impl; import com.test.springboot.ssm.dao.DeptDAO; import com.test.springboot.ssm.pojo.Dept; import com.test.springboot.ssm.service.DeptService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class DeptServiceImpl implements DeptService { @Autowired private DeptDAO deptDAO; @Override public List<Dept> getDeltList() { return deptDAO.getDeltList(); } @Override public void addDept(String name) { deptDAO.addDept(name); } }
6.controller层
package com.test.springboot.ssm.controller; import com.test.springboot.ssm.pojo.Dept; import com.test.springboot.ssm.service.DeptService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import java.util.List; @Controller public class DeptController { @Autowired private DeptService deptService; @RequestMapping("list.html") public ModelAndView list() { List<Dept> deptList = deptService.getDeltList(); return new ModelAndView("list", "deptList", deptList); } @RequestMapping("add.html") public String add(String name) { deptService.addDept(name); //添加成功后重定向到列表页 return "redirect:list.html"; } } jsp页面 add.jsp <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <body> <form action="/add.html" method="post"> 部门名:<input type="text" name="name"/><br/> <input type="submit" value="add"/> </form> </body> </html> list.jsp <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <body> <c:forEach items="${deptList}" var="dept"> ${dept.id}-${dept.name}<br/> </c:forEach> </body> </html>
貌似到目前为止，编码的形式和我们开发普通的SSM没什么区别，不要着急，重点来了。传统的ssm中我们需需要
在spring.xml中配置数据源、声明式事务、mybatis配置信息、注解扫描等。使用SpringBoot，我们可以省略掉所
有的xml。没错，就是一个配置文件都没有，废话少说，上代码：
SpringBoot有个全局的属性配置文件application.properties
#数据源的基本信息
spring.datasource.url = jdbc:mysql://localhost:3306/test?characterEncoding=utf-8 spring.datasource.username = root spring.datasource.password = spring.datasource.driverClassName = com.mysql.jdbc.Driver #mybatis中mapper文件的路径 mybatis.mapper-locations=classpath*:com/test/springboot/ssm/dao/mappers/*.xml #起别名。可省略写mybatis的xml中的resultType的全路径 mybatis.type-aliases-package=com.test.springboot.ssm.pojo #springMVC中的视图信息，响应前缀 spring.mvc.view.prefix=/ # 响应页面默认后缀 spring.mvc.view.suffix=.jsp #DispatcherServlet中响应的url-pattern server.sevlet-path=*.html
7.入口类
package com.test.springboot.ssm; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; import org.springframework.transaction.annotation.EnableTransactionManagement; @SpringBootApplication @EnableTransactionManagement//开启事务管理 @ComponentScan("com.test.springboot.ssm")//扫描注解元素 @MapperScan("com.test.springboot.ssm.dao")//Mybatis的DAO所在包 public class SpringbootSsmApplication { public static void main(String[] args) { SpringApplication.run(SpringbootSsmApplication.class, args); } }
对比发现，SpringBoot可以省略大量的xml配置文件，几个注解轻松代替繁琐的配置。为了方便大家接受
SpringBoot，本文中的示例使用的页面模板引擎还是jsp。Spring官网推荐使用Thymeleaf 作为页面模板引擎，后
续的学习中
