LZ今天自己搭建了下Spring boot+Mybatis,比原来的Spring+SpringMVC+Mybatis简单好多。其实只用Spring boot也可以开发,但是对于多表多条件分页查询,Spring boot就有点力不从心了,所以LZ把Mybatis整合进去,不得不说,现在的框架搭建真的是方便。话不多说,进入正题。
一、java web开发环境搭建
网上有很多教程,参考教程:http://www.cnblogs.com/Leo_wl/p/4752875.html
二、Spring boot搭建
1、Intellij idea菜单栏File->new->project。
2、选择左侧栏中spring initializr,右侧选择jdk版本,以及默认的Service URL,点击next。
/3、然后填写项目的Group、Artifact等信息,helloworld阶段选默认就可以了,点击next。
4、左侧点击Web,中间一侧选择Web,然后左侧选择SQL,中间一侧选择JPA、Mybatis、MYSQL(LZ数据库用的是mysql,大家可以选择其他DB),点击next。
5、填写Project name 等信息,然后点击Finish。
至此,一个maven web项目就创建好了,目录结构如下:
这样,Spring boot就搭建好了,pom.xml里已经有了Spring boot的jar包,包括我们的mysql数据连接的jar包。Spring boot内置了类似tomcat这样的中间件,所以,只要运行DemoApplication中的main方法就可以启动项目了。我们测试一下。
在src/main/java下新建目录com/demo/entity/User。
package com.demo.entity; public class User { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
相同目录下新建com/demo/controller/TestBootController。
package com.demo.controller; import com.demo.entity.User; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @EnableAutoConfiguration @RequestMapping("/testboot") public class TestBootController { @RequestMapping("getuser") public User getUser() { User user = new User(); user.setName("test"); return user; } }
spring boot启动DemoAplication是需要扫描它下面的Controller等类的,所以将DemoApplication移动到com/demo目录下。还有就是Spring boot启动默认是要加载数据源的,所以我们在src/main/resources下新建application.yml:
#默认使用配置 spring: profiles: active: dev #公共配置与profiles选择无关 mybatis: typeAliasesPackage: com.xdd.entity mapperLocations: classpath:mapper/*.xml --- #开发配置 spring: profiles: dev datasource: url: jdbc:mysql://localhost:3306/test username: root password: root driver-class-name: com.mysql.jdbc.Driver
或者将pom.xml中加载数据源的jar包先注释掉也可以。
/*<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.0</version> </dependency>*/
最终的目录结构如下,
启动DemoApplication的main方法,访问http://localhost:8080/testboot/getuser即可。
三、整合Mybatis
1、集成druid,使用连接池。pom.xml中添加:
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.0</version> </dependency>
最终的pom.xml文件:
<?xml version="1.0" encoding="UTF-8"?> <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>com.arm</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.8.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-data-jpa</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-web</artifactId> </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> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.0</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
在application.yml中添加数据源、Mybatis的实体和配置文件位置。
#默认使用配置 spring: profiles: active: dev #公共配置与profiles选择无关 mapperLocations指的路径是src/main/resources mybatis: typeAliasesPackage: com.xdd.entity mapperLocations: classpath:mapper/*.xml --- #开发配置 spring: profiles: dev datasource: url: jdbc:mysql://localhost:3306/test username: root password: root driver-class-name: com.mysql.jdbc.Driver # 使用druid数据源 type: com.alibaba.druid.pool.DruidDataSource
就这样就整合完成了!我们测试一下。
用MyBatis Generator自动生成代码,参考博文:http://blog.csdn.net/zhshulin/article/details/23912615 这里列一下自动生成的代码。
import com.xdd.entity.User; import org.springframework.stereotype.Component; public interface UserDao { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); }
UserMapper.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="com.xdd.dao.UserDao" > <resultMap id="BaseResultMap" type="com.xdd.entity.User" > <id column="id" property="id" jdbcType="INTEGER" /> <result column="user_name" property="userName" jdbcType="VARCHAR" /> <result column="password" property="password" jdbcType="VARCHAR" /> <result column="age" property="age" jdbcType="INTEGER" /> </resultMap> <sql id="Base_Column_List" > id, user_name, password, age </sql> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > select <include refid="Base_Column_List" /> from user_t where id = #{id,jdbcType=INTEGER} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > delete from user_t where id = #{id,jdbcType=INTEGER} </delete> <insert id="insert" parameterType="com.xdd.entity.User" > insert into user_t (id, user_name, password, age) values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}) </insert> <insert id="insertSelective" parameterType="com.xdd.entity.User" > insert into user_t <trim prefix="(" suffix=")" suffixOverrides="," > <if test="id != null" > id, </if> <if test="userName != null" > user_name, </if> <if test="password != null" > password, </if> <if test="age != null" > age, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="id != null" > #{id,jdbcType=INTEGER}, </if> <if test="userName != null" > #{userName,jdbcType=VARCHAR}, </if> <if test="password != null" > #{password,jdbcType=VARCHAR}, </if> <if test="age != null" > #{age,jdbcType=INTEGER}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.xdd.entity.User" > update user_t <set > <if test="userName != null" > user_name = #{userName,jdbcType=VARCHAR}, </if> <if test="password != null" > password = #{password,jdbcType=VARCHAR}, </if> <if test="age != null" > age = #{age,jdbcType=INTEGER}, </if> </set> where id = #{id,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.xdd.entity.User" > update user_t set user_name = #{userName,jdbcType=VARCHAR}, password = #{password,jdbcType=VARCHAR}, age = #{age,jdbcType=INTEGER} where id = #{id,jdbcType=INTEGER} </update> </mapper>
public class User { private Integer id; private String userName; private String password; private Integer age; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName == null ? null : userName.trim(); } public String getPassword() { return password; } public void setPassword(String password) { this.password = password == null ? null : password.trim(); } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
最后将DemoApplication.java修改一下,让其扫描dao层接口。
import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.support.SpringBootServletInitializer; @SpringBootApplication @MapperScan("com.xdd.dao") public class DemoApplication extends SpringBootServletInitializer{ public static void main(String[] args) { SpringApplication.run(DemoApplication.class,args); } }
自己添加controller和service
import java.util.List; import java.util.Map; public interface UserService { public User getUserById(int userId); boolean addUser(User record); }
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.List; import java.util.Map; @Service("userService") public class UserServiceImpl implements UserService { @Resource private UserDao userDao; public User getUserById(int userId) { return userDao.selectByPrimaryKey(userId); } public boolean addUser(User record){ boolean result = false; try { userDao.insertSelective(record); result = true; } catch (Exception e) { e.printStackTrace(); } return result; } }
@Controller @RequestMapping("/user") public class UserController { @Resource private UserService userService; @RequestMapping("/showUser") @ResponseBody public User toIndex(HttpServletRequest request, Model model){ int userId = Integer.parseInt(request.getParameter("id")); User user = this.userService.getUserById(userId); return user; } }
浏览器访问http://localhost:8080/user/showUser?id=1
以前找别人的教程的时候总是嫌弃人家写的不详细,真的自己写的时候发现很多细节我也详细介绍不到,比如yml文件使用,比如数据库,看来还是要求别人容易,要求自己难。