/**
   * json 三種實現(xiàn)方法
   * 1 @RestController自動返回json
   */
  @GetMapping("/json")
  public Student getjson() {
    Student student = new Student("bennyrhys",158
    );
    return student;
  }

//@RestController
  @Controller
// 類名上方


  @GetMapping("/json")
  @ResponseBody
  public Student getjson() {
    Student student = new Student("bennyrhys",158
    );
    return student;
  }

//@RestController
  @Controller
// 類名上方


@GetMapping("/fastjson")
  public void fastjson(HttpServletResponse response){
    Student student = new Student("bennyrhys",158);
    String data = JSON.toJSONString(student);


    try {
      sendJsonData(response, data);
    } catch (IOException e) {
      e.printStackTrace();
    }

  }

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

JSONObject jSONObject = JSONObject.parseObject(String);
JSONArray jsonArray= JSONArray.parseArray(String);

JSONArray jsonArray= jsonObject.getJSONArray(“Result”);

JSONObject jsonObject = jsonArray.getJSONObject(0);

JSONArray jsonArray= jsonObject.getJSONArray(“Result”);
JSONObject jsonObject = jsonArray.getJSONObject(0);

import java.io.Serializable;

public class JsonResponse<T> implements Serializable {
  private Integer code;
  private String msg;
  private T result;

  public JsonResponse() {
  }

  public JsonResponse(Integer code, String msg, T result) {
    this.code = code;
    this.msg = msg;
    this.result = result;
  }

  public Integer getCode() {
    return code;
  }

  public void setCode(Integer code) {
    this.code = code;
  }

  public String getMsg() {
    return msg;
  }

  public void setMsg(String msg) {
    this.msg = msg;
  }

  public T getResult() {
    return result;
  }

  public void setResult(T result) {
    this.result = result;
  }

  public static class JsonResponseUtil {
    public static JsonResponse<Object> ok() {
      return ok(null);
    }

    public static <T> JsonResponse<T> ok(T result) {
      return new JsonResponse<>(0, "", result);
    }

    public static JsonResponse<Object> error(Integer code) {
      return error(code, "error!");
    }

    public static JsonResponse<Object> error(String msg) {
      return error(-1, msg);
    }

    public static JsonResponse<Object> error(Integer code, String msg) {
      return new JsonResponse<>(code, msg, null);
    }
  }
}

return ResponseEntity.ok(JsonResponse.JsonResponseUtil.ok(source));