后端返回Json的方式

Java返回Json的两种方式
1 返回一个对象

@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;
    }

2 利用JSON.toJSONString

@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();
    }
}