（2）学习SrpingBoot 之 返回Json数据

上一篇讲到了怎么创建一个简易的SpringBoot程序，这一篇讲讲SpringBoot返回的Json数据

1.用Maven创建Spring-boot-json项目，编写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>cn.moye</groupId><artifactId>spring-boot-json</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-json</name><url>http://maven.apache.org</url><!-- 可以直接从Spring官网Demo拷贝 --><parent><!-- SpringBoot 父节点依赖，引入之后相关的依赖就不需要添加version配置 --><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.7.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><jdk.version>1.8</jdk.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><build><finalName>spring-boot-json</finalName><plugins><plugin><!-- 这是一个maven用来编译源码的插件 --><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><srouce>${jdk.version}</srouce><target>${jdk.version}</target><encoed>${project.build.sourceEncoding}</encoed></configuration></plugin></plugins></build></project>

2.创建一个测试实体类Student

package cn.moye.spring_boot_json.model;/* * 测试实体类 */public class Student {private int id;private String name;public int getId() {return id;}public String getName() {return name;}public void setId(int id) {this.id = id;}public void setName(String name) {this.name = name;}public Student(int id, String name) {super();this.id = id;this.name = name;}public Student() {super();}}

3.编写启动类，由于SpringBoot集成了jackson包，返回值会有框架底层代码自动转换。所以我们直接返回实体类就好了

（1）@ResponseBody 方式

package cn.moye.spring_boot_json;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import cn.moye.spring_boot_json.model.Student;@SpringBootApplication@Controllerpublic class StartSpringBootMain {public static void main(String[] args) {/* * main入口 */SpringApplication.run(StartSpringBootMain.class, args);}@RequestMapping("/json")@ResponseBodypublic Student json() {Student s = new Student();s.setId(1001);s.setName("Spring Boot");return s;}}

（2）RestController方式

package cn.moye.spring_boot_json;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import cn.moye.spring_boot_json.model.Student;@SpringBootApplication@RestControllerpublic class StartSpringBootMain {public static void main(String[] args) {/* * main入口 */SpringApplication.run(StartSpringBootMain.class, args);}@RequestMapping("/json")public Student json() {Student s = new Student();s.setId(1001);s.setName("Spring Boot");return s;}}

4.右键 Run as Applcation ,启动SpringBoot项目。 打开浏览器 输入http://localhost:8080/json  就可以看到输出结果了