java返回数据的封装

1public class Result<T> {
2    private Integer code;
3    private String msg;
4    private T data;
5
6    public Result() {
7        super();
8    }
9
10    public Result(Integer code, String msg, T data) {
11        this.code = code;
12        this.msg = msg;
13        this.data = data;
14    }
15
16    public Integer getCode() {
17        return code;
18    }
19
20    public void setCode(Integer code) {
21        this.code = code;
22    }
23
24    public String getMsg() {
25        return msg;
26    }
27
28    public void setMsg(String msg) {
29        this.msg = msg;
30    }
31
32    public T getData() {
33        return data;
34    }
35
36    public void setData(T data) {
37        this.data = data;
38    }
39
40    @Override
41    public String toString() {
42        return "Result{" +
43                "code=" + code +
44                ", msg='" + msg + '\'' +
45                ", data=" + data +
46                '}';
47    }
48}
49
50public enum ResultEnum {
51    //这里是可以自己定义的，方便与前端交互即可
52    UNKNOWN_ERROR(-1,"未知错误"),
53    SUCCESS(200,"成功"),
54    SERVER_INTERNAL_ERROR(500,"服务器内部错误"),
55    RESOURCE_NOT_FOUND(404,"资源未找到"),
56    PARAMETER_NOT_VALID(400,"参数不合法"),
57    ;
58    private Integer code;
59    private String msg;
60
61    ResultEnum(Integer code, String msg) {
62        this.code = code;
63        this.msg = msg;
64    }
65
66    public Integer getCode() {
67        return code;
68    }
69
70    public String getMsg() {
71        return msg;
72    }
73}
74
75public class ResultUtil {
76
77    /**成功且带数据**/
78    public static Result success(Object object){
79        Result result = new Result();
80        result.setCode(ResultEnum.SUCCESS.getCode());
81        result.setMsg(ResultEnum.SUCCESS.getMsg());
82        result.setData(object);
83        return result;
84    }
85    /**成功但不带数据**/
86    public static Result success(){
87
88        return success(null);
89    }
90    /**失败**/
91    public static Result error(Integer code,String msg){
92        Result result = new Result();
93        result.setCode(code);
94        result.setMsg(msg);
95        return result;
96    }
97}
98
99//测试
100@RequestMapping(value = "/list", method = RequestMethod.POST)
101    public Result findCategoryByPid(@RequestBody Map map){
102        map.get("parentId");
103        List<Category> list = categoryService.findCategoryByPid(map);
104        if (CollectionUtils.isEmpty(list)){
105            return ResultUtil.error(404,"资源未找到到");
106        }
107        return ResultUtil.success(list);
108    }