SpringBoot 进阶2-与 Mybatis实现SpringMVC Web项目

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一，热身

Spring Boot是一个一全新框架。Spring Boot就是用来简化Spring应用的搭建以及开发过程。该框架致力于实现免XML配置，提供便捷，独立的运行环境，实现“一键运行”满足快速应用开发的需求。补充提示，Spring Boot 推荐采用基于 Java 注解的配置方式，而不是传统的 XML。只需要在主配置 Java 类上添加“@EnableAutoConfiguration”注解就可以启用自动配置。Spring Boot 的自动配置功能是没有侵入性的，只是作为一种基本的默认实现。开发人员可以通过定义其他 bean 来替代自动配置所提供的功能，例如在配置本案例数据源（DataSource）时，可以体会到该用法。

更多基础知识参考
Spring boot 入门helloWorld

二、实践

一些说明：

项目IDE采用IEclipse

工程依赖管理采用个人比较熟悉的Maven（事实上SpringBoot与Groovy才是天生一对）
1.预览：

（1）github地址
https://github.com/lichch/stringboot-mybatis.git
（2）完整项目结构
这里写图片描述

（3）数据库

数据库名：test

【user.sql】

SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for user-- ----------------------------DROP TABLE IF EXISTS `user`;CREATE TABLE `user` (  `id` int(11) NOT NULL,  `name` varchar(255) DEFAULT NULL,  `age` int(11) DEFAULT NULL,  `password` varchar(255) DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;-- ------------------------------ Records of user-- ----------------------------INSERT INTO `user` VALUES ('1', 'lichch', '18', '123456');

2.Maven配置

完整的【pom.xml】配置如下：

<?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>cn.7player.framework</groupId>    <artifactId>springboot-mybatis</artifactId>    <version>1.0-SNAPSHOT</version>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.2.5.RELEASE</version>    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <version.spring>3.2.9.RELEASE</version.spring>        <version.jackson>2.4.4</version.jackson>        <java.version>1.7</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-thymeleaf</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-jdbc</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis-spring</artifactId>            <version>1.2.2</version>        </dependency>        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis</artifactId>            <version>3.2.8</version>        </dependency>        <dependency>            <groupId>org.apache.tomcat</groupId>            <artifactId>tomcat-jdbc</artifactId>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>        </dependency>        <!---->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.1.43</version>        </dependency>        <dependency>            <groupId>com.mangofactory</groupId>            <artifactId>swagger-springmvc</artifactId>            <version>0.9.5</version>        </dependency>         <!--swagger2--><dependency>  <groupId>io.springfox</groupId>  <artifactId>springfox-swagger2</artifactId>  <version>2.6.1</version></dependency><dependency>  <groupId>io.springfox</groupId>  <artifactId>springfox-swagger-ui</artifactId>  <version>2.6.1</version></dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-annotations</artifactId>            <version>${version.jackson}</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-databind</artifactId>            <version>${version.jackson}</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-core</artifactId>            <version>${version.jackson}</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build>    <repositories>        <repository>            <id>spring-milestone</id>            <url>https://repo.spring.io/libs-release</url>        </repository>    </repositories>    <pluginRepositories>        <pluginRepository>            <id>spring-milestone</id>            <url>https://repo.spring.io/libs-release</url>        </pluginRepository>    </pluginRepositories></project>

3.主函数

【Application.java】包含main函数，像普通java程序启动即可。

此外，该类中还包含和数据库相关的DataSource，SqlSeesion配置内容。

注：@MapperScan(“cn.no7player.mapper”) 表示Mybatis的映射路径（package路径）

 package cn.no7player;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.log4j.Logger;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.PlatformTransactionManager;import javax.sql.DataSource;@EnableAutoConfiguration@SpringBootApplication@ComponentScan@MapperScan("cn.no7player.mapper")public class Application {    private static Logger logger = Logger.getLogger(Application.class);    @Bean    @ConfigurationProperties(prefix="spring.datasource")    public DataSource dataSource() {        return new org.apache.tomcat.jdbc.pool.DataSource();    }    @Bean    public SqlSessionFactory sqlSessionFactoryBean() throws Exception {        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();        sqlSessionFactoryBean.setDataSource(dataSource());        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();        sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));        return sqlSessionFactoryBean.getObject();    }    @Bean    public PlatformTransactionManager transactionManager() {        return new DataSourceTransactionManager(dataSource());    }    /**     * Start     */    public static void main(String[] args) {        SpringApplication.run(Application.class, args);        logger.info("SpringBoot Start Success");    }}

4.Controller

请求入口Controller部分提供三种接口样例：视图模板，Json，restful风格

（1）视图模板

返回结果为视图文件路径。视图相关文件默认放置在路径 resource/templates下：

package cn.no7player.controller;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;@Controllerpublic class HelloController {    @RequestMapping("/hello")    public String greeting(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {        model.addAttribute("name", name);        return "hello";    }}

（2）Json

返回Json格式数据，多用于Ajax请求。

package cn.no7player.controller;import org.apache.log4j.Logger;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import cn.no7player.model.User;import cn.no7player.service.UserService;/** *  * ClassName: UserController <br/> * date: 2017年4月14日 上午10:58:17 <br/> * * @author lichch * @version * @since JDK 1.7 */@Controllerpublic class UserController {    private Logger logger = Logger.getLogger(UserController.class);    @Autowired    private UserService userService;    @RequestMapping("/getUserInfo")    @ResponseBody    public User getUserInfo() {        User user = userService.getUserInfo();        if (user != null) {            System.out.println("user.getName():" + user.getName());            logger.info("user.getAge():" + user.getAge());        }        return user;    }}

（3）restful

REST 指的是一组架构约束条件和原则。满足这些约束条件和原则的应用程序或设计就是 RESTful。

此外，有一款RESTFUL接口的文档在线自动生成+功能测试功能软件——Swagger UI，具体配置过程可移步《Spring Boot进阶1 - 整合Swagger2自动生成RESTful API文档》
http://blog.csdn.net/qq_15969757/article/details/70160541

package cn.no7player.controller;import java.util.ArrayList;import java.util.List;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import com.wordnik.swagger.annotations.ApiOperation;import cn.no7player.model.User;/** *  * ClassName: SwaggerController <br/> * Function: TODO ADD FUNCTION. <br/> * Reason: TODO ADD REASON(可选). <br/> * date: 2017年4月13日 下午2:21:00 <br/> * * @author lichch * @version * @since JDK 1.7 */@RestController@RequestMapping(value = "/users")public class SwaggerController {    /**     *     * @return     */    @ApiOperation(value = "查询所有用户", notes = "查询得到所有用户")    @RequestMapping(method = RequestMethod.GET)    public List<User> getUsers() {        List<User> list = new ArrayList<User>();        User user = new User();        user.setName("hello");        list.add(user);        User user2 = new User();        user.setName("world");        list.add(user2);        return list;    }    @ApiOperation(value = "通过id查询用户", notes = "通过id查询用户")    @RequestMapping(value = "/{name}", method = RequestMethod.GET)    public User getUserById(@PathVariable String name) {        User user = new User();        user.setName("hello world");        return user;    }}

5.Mybatis

配置相关代码在Application.java中体现。

（1）【application.properties】

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNullspring.datasource.username=rootspring.datasource.password=rootspring.datasource.driver-class-name=com.mysql.jdbc.Driver

注意，在Application.java代码中，配置DataSource时的注解

@ConfigurationProperties(prefix=“spring.datasource”)

表示将根据前缀“spring.datasource”从application.properties中匹配相关属性值。
（2）【UserMapper.xml】

Mybatis的sql映射文件。Mybatis同样支持注解方式。

<?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="cn.no7player.mapper.UserMapper">  <select id="findUserInfo" resultType="cn.no7player.model.User">    select name, age,password from user;  </select></mapper>

（3）接口UserMapper

package cn.no7player.mapper;import cn.no7player.model.User;public interface UserMapper {    public User findUserInfo();}

三、总结

（1）运行 Application.java

（2）控制台输出：
开始
这里写图片描述

运行成功
这里写图片描述

（3）访问：

针对三种控制器的访问分别为：视图：

http://localhost:8080/hello?name=7player

这里写图片描述

Json：

http://localhost:8080/getUserInfo
这里写图片描述

Restful（使用了swagger）：

http://localhost:8080/swagger-ui.html

这里写图片描述

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