Mybatis这个框架式当下比较流行的框架，SpringBoot整合Mybatis其实和整合JPA是比较相似的，有区别的只是数据操作的部分。
1、引入相应依赖
mybatis-spring-boot-starter
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency>
pagehelper
<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.6</version> </dependency>
完整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/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>edu.hpu</groupId> <artifactId>SpringBoot</artifactId> <version>0.0.1-SNAPSHOT</version> <name>SpringBoot</name> <!-- Spring Boot 启动父依赖 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.3.3.RELEASE</version> </parent> <dependencies> <!-- Spring Boot web依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- Junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!-- 添加servlet依赖 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> </dependency> <!--添加 jstl依赖 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <!-- tomcat的支持 --> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency> <!-- 热部署依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> <!-- 这个需要为 true 热部署才有效 --> </dependency> <!-- 添加对mysql的支持 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.21</version> </dependency> <!--mybatis支持 --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency> <!-- pagehelper --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.6</version> </dependency> </dependencies> <properties> <java.version>1.8</java.version> </properties> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2、application.properties
除了数据源相关的配置，和Mybatis相关的还要指明从哪里去找xml配置文件，同时指定别名
spring.mvc.view.prefix=/WEB-INF/jsp/ spring.mvc.view.suffix=.jsp spring.datasource.url=jdbc:mysql://localhost:3306/springbootjpa?characterEncoding=UTF-8 spring.datasource.username=root spring.datasource.password=xing0515 spring.datasource.driver-class-name=com.mysql.jdbc.Driver mybatis.mapper-locations=classpath:edu/hpu/springboot/mapper/*.xml mybatis.type-aliases-package=edu.hpu.springboot.pojo
3、数据
懒得再建了，还是用之前的
create database springbootjpa;
use springbootjpa; CREATE TABLE category_ ( id int(11) NOT NULL AUTO_INCREMENT, name varchar(30), PRIMARY KEY (id) ) DEFAULT CHARSET=UTF8;
相应的实体类
package edu.hpu.springboot.pojo; public class Category { private int id; private String name; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
4、PageHelperConfig
新建一个包edu.hpu.springboot.config，包下新建一个类 PageHelperConfig，这个类是干什么的，管分页的。
注解@Configuration 表示PageHelperConfig 这个类是用来做配置的。
注解@Bean 表示启动PageHelper这个拦截器。
import org.springframework.context.annotation.Configuration; import com.github.pagehelper.PageHelper; @Configuration public class PageHelperConfig { @Bean public PageHelper pageHelper() { PageHelper pageHelper = new PageHelper(); Properties p = new Properties(); p.setProperty("offsetAsPageNum", "true"); //将RowBounds第一个参数offset当成pageNum页码使用. p.setProperty("rowBoundsWithCount", "true"); //使用RowBounds分页会进行count查询 p.setProperty("reasonable", "true"); //启用合理化时，如果pageNum<1会查询第一页，如果pageNum>pages会查询最后一页 pageHelper.setProperties(p); return pageHelper; } }
5、CategoryMapper
新建一个edu.hpu.springboot.mapper包，包下新建一个接口CategoryMapper
package edu.hpu.springboot.mapper; import java.util.List; import org.apache.ibatis.annotations.Mapper; import edu.hpu.springboot.pojo.Category; @Mapper public interface CategoryMapper { List<Category> findAll(); public int save(Category category); public void delete(int id); public Category get(int id); public int update(Category category); }
6、Category.xml
在edu.hpu.springboot.mapper下新建Category.xml
<?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="edu.hpu.springboot.mapper.CategoryMapper"> <select id="findAll" resultType="Category"> select * from category_ </select> <insert id="save" parameterType="Category"> insert into category_ ( name ) values (#{name}) </insert> <delete id="delete" parameterType="int"> delete from category_ where id= #{id} </delete> <select id="get" parameterType="int" resultType="Category"> select * from category_ where id= #{id} </select> <update id="update" parameterType="Category"> update category_ set name=#{name} where id=#{id} </update> </mapper>
7、CategoryController
package edu.hpu.springboot.web; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.servlet.ModelAndView; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import edu.hpu.springboot.mapper.CategoryMapper; import edu.hpu.springboot.pojo.Category; @Controller public class CategoryController { @Autowired CategoryMapper categoryMapper; @RequestMapping("/listCategory") public String listCategory(Model m,@RequestParam(value = "start", defaultValue = "0") int start,@RequestParam(value = "size", defaultValue = "5") int size) throws Exception { PageHelper.startPage(start,size,"id desc"); List<Category> cs=categoryMapper.findAll(); PageInfo<Category> page = new PageInfo<>(cs); m.addAttribute("page", page); return "listCategory"; } @RequestMapping("/addCategory") public String listCategory(Category c) throws Exception { categoryMapper.save(c); return "redirect:listCategory"; } @RequestMapping("/deleteCategory") public String deleteCategory(Category c) throws Exception { categoryMapper.delete(c.getId()); return "redirect:listCategory"; } @RequestMapping("/updateCategory") public String updateCategory(Category c) throws Exception { categoryMapper.update(c); return "redirect:listCategory"; } @RequestMapping("/editCategory") public String listCategory(int id,Model m) throws Exception { Category c= categoryMapper.get(id); m.addAttribute("c", c); return "editCategory"; } }
8、listCategory.jsp与editCategory.jsp
listCategory.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ 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"> <title>查看分类</title> </head> <body> <div style="width: 500px; margin: 20px auto; text-align: center"> <table align='center' border='1' cellspacing='0'> <tr> <td>id</td> <td>name</td> <td>编辑</td> <td>删除</td> </tr> <c:forEach items="${page.list}" var="c" varStatus="st"> <tr> <td>${c.id}</td> <td>${c.name}</td> <td><a href="editCategory?id=${c.id}">编辑</a></td> <td><a href="deleteCategory?id=${c.id}">删除</a></td> </tr> </c:forEach> </table> <br> <div> <a href="?start=1">[首 页]</a> <a href="?start=${page.pageNum-1}">[上一页]</a> <a href="?start=${page.pageNum+1}">[下一页]</a> <a href="?start=${page.pages}">[末 页]</a> </div> <br> <form action="addCategory" method="post"> name: <input name="name"> <br> <button type="submit">提交</button> </form> </div> </html>
editCategory.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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"> <title>修改</title> </head> <body> <div style="margin: 0px auto; width: 500px"> <form action="updateCategory" method="post"> name: <input name="name" value="${c.name}"> <br> <input name="id" type="hidden" value="${c.id}"> <button type="submit">提交</button> </form> </div> </body> </html>
整个项目结构一览（忽略掉那个红叉，不影响）
跑一下
关于Mybatis，还可以使用注解的方式，就是不用xml配置，在接口相应语句上添加注解，比如
@Select("select * from category_ ") List<Category> findAll();
