java往前端ajax反数据实体类

╰+哭是因爲堅強的太久メ 2022-05-27 11:08 56阅读 0赞

## 前言 ##

最近在springMVC框架中用到一个实体类，用来返回ajax请求，这里分享一下这个类。

## 具体用法 ##

1.实体类

import java.io.Serializable;
    /** 1. 响应类 */
    public class ResponseVO<T> implements Serializable{ 
    
        private static final long serialVersionUID = -5007654155748473782L;
    
        /** * 状态码 */
        private String code;
        /** * 消息（错误信息） */
        private String msg;
        /** * 返回数据 */
        private T data;
    
        public String getCode() {
            return code;
        }
        public ResponseVO<T> setCode(String code) {
            this.code = code;
            return this;
        }
        public String getMsg() {
            return msg;
        }
        public ResponseVO<T> setMsg(String msg) {
            this.msg = msg;
            return this;
        }
        public T getData() {
            return data;
        }
        public ResponseVO<T> setData(T data) {
            this.data = data;
            return this;
        }
    
        /** * 状态码定义 */
        public interface ResponseCode{
    
            /** * 成功 */
            public static final String SUCCESS = "0";
            /** * 业务报错 */
            public static final String ERROR = "1";
            /** * 程序异常 */
            public static final String EXCEPTION = "-1";
    
        }
    
        /** * 默认创建方法 * @return */
        public static <T> ResponseVO<T> build(){
            ResponseVO<T> responseVO = new ResponseVO<T>();
            return responseVO.setCode(ResponseCode.SUCCESS);
        }
    
        /** * 默认抛出异常 * @return */
        public static <T> ResponseVO<T> exception(){
            ResponseVO<T> responseVO = new ResponseVO<T>();
            return responseVO.setCode(ResponseCode.EXCEPTION).setMsg("服务器发生异常，请联系管理员！");
        }
    
        /** * 默认错误 * @return */
        public static <T> ResponseVO<T> error(){
            ResponseVO<T> responseVO = new ResponseVO<T>();
            return responseVO.setCode(ResponseCode.ERROR);
        }
    }

2.后端用法

@ResponseBody
    @RequestMapping(value = "getNames")
    public ResponseVO<List<String>> getNames(String id) {
        List<String> names = new ArrayList<String>();
        try {
            names.add("zhangsan");
            names.add("lisi");
            return ResponseVO.<List<String>>build().setData(names);
        } catch (Exception e) {
            return ResponseVO.<List<String>>exception();
        }
    }

@ResponseBody
    @RequestMapping(value = "getNames")
    public ResponseVO<Student> getNames(String id) {
        Student student = new Student();
        try {
            student.setName("zhangsan");
            student.setAge(21);
            return ResponseVO.<Student>build().setData(student);
        } catch (Exception e) {
            return ResponseVO.<List<String>>exception();
        }
    }

以上列举2中数据类型

3.前端ajax用法

$.ajax({
        type: "POST",
        url: ctx + '/.../getNames',
        data: {id:id},
        dataType: "json",
        success: function(dataMap){
            if(dataMap.code == '0'){
                $.each(dataMap.data,function(k,v){
                    ...
                });
            }else{
                layer.msg(dataMap.msg,{icon:7});
            }
        }
    });

## 后记 ##

这个类主要是用到了泛型类和泛型方法，使得它能够通用各种数据类型。