SpringBoot 返回json数据 的几种方式

（一）@RestController    +   @RequestMapping("/")

@RestController
public class TestController {

    @RequestMapping("/")
    public User test(){
        User user = new User();
        user.setId(new BigDecimal(12));
        user.setSex("12");
        user.setUsername("phpfzh");
        return user;
    }
}

（二）@ResponseBody

@Controller
public class TestController2 {

    @ResponseBody
    @RequestMapping("/test2")
        public User test2(){
        User user = new User();
        user.setId(new BigDecimal(12));
        user.setSex("12");
        user.setUsername("phpfzh-test2");
        return user;
    }
}

（三）、response

@Controller
public class TestController3 {

@RequestMapping("/test3")
  public String test(HttpServletResponse response){
        User user = new User();
        user.setId(new BigDecimal(12));
        user.setSex("12");
        user.setUsername("phpfzh-test3");
        String date = JSON.toJSONString(user);
        try {
        sendJsonData(response, date);
        } catch (Exception e) {
          e.printStackTrace();
    }
    return null;
}

protected void sendJsonData(HttpServletResponse response, String data) throws Exception{
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    out.println(data);
    out.flush();
    out.close();
    }
}

转载：https://blog.csdn.net/phpfzh/article/details/77978232

可参考：https://blog.csdn.net/yelllowcong/article/details/79718068