spring boot入门（二）- 输出json对象

pom文件引入fastjson的依赖

        <!-- 添加fastjson 依赖包. -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.2.15</version>        </dependency>

pojo类

package com.hnust.pojo;import com.hnust.utils.Validator;import java.io.Serializable;import java.util.Date;public class User implements Serializable {    private static final long serialVersionUID = 1L;    private Integer uid;    private String username;    private String realname;    public Integer getUid() {        return uid;    }    public void setUid(Integer uid) {        this.uid = uid;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getRealname() {        return realname;    }    public void setRealname(String realname) {        this.realname = realname;    }}

controller类

package com.hnust.controller;import com.hnust.pojo.UserInfo;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;/** * Created by xiaojiang on 2017/8/27. */@RestController@Controllerpublic class HelloController {    @RequestMapping("/hello")    public String hello() {        return "helloworld";    }    /**     * Spring Boot默认使用的json解析框架是jackson     */    @RequestMapping("/getUserInfo")    @ResponseBody    public UserInfo getUserInfo() {        UserInfo userInfo = new UserInfo();        userInfo.setUid(123456);        userInfo.setUsername("张三");        userInfo.setRealname("zhangsan123");        return userInfo;    }}

启动类添加配置json的bean

package com.hnust;import com.alibaba.fastjson.serializer.SerializerFeature;import com.alibaba.fastjson.support.config.FastJsonConfig;import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.web.HttpMessageConverters;import org.springframework.context.annotation.Bean;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import java.nio.charset.Charset;import java.util.ArrayList;import java.util.List;/** * Created by xiaojiang on 2017/8/27. */@SpringBootApplicationpublic class AppMain {    /**     * 在这里我们使用 @Bean注入 fastJsonHttpMessageConvert     * @return     */    @Bean    public HttpMessageConverters fastJsonHttpMessageConverters() {        // 1、需要先定义一个 convert 转换消息的对象;        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();        //2、添加fastJson 的配置信息，比如：是否要格式化返回的json数据;        FastJsonConfig fastJsonConfig = new FastJsonConfig();        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);        fastJsonConfig.setCharset(Charset.forName("UTF-8"));        //3、在convert中添加配置信息.        //处理中文乱码问题        List<MediaType> fastMediaTypes = new ArrayList<>();        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);        fastConverter.setSupportedMediaTypes(fastMediaTypes);        HttpMessageConverter<?> converter = fastConverter;        return new HttpMessageConverters(converter);    }    public static void main(String[] args) {        /**在main方法进行启动我们的应用程序*/        SpringApplication.run(AppMain.class);    }}

结果运行图：

注意：
1、spring默认支持jackson格式的json
2、springboot配置bean使用@bean