SpringBoot的JSON工具类（java），用于前后端分离

迈不过友情╰ 2023-09-28 12:28 26阅读 0赞

## 简介 ##

> JSON（JavaScript Object Notation, JS对象简谱）是一种轻量级的数据交换格式。它基于 ECMAScript（European Computer Manufacturers Association, 欧洲计算机协会制定的js规范）的一个子集，采用完全独立于编程语言的文本格式来存储和表示数据。简洁和清晰的层次结构使得 JSON 成为理想的数据交换语言。 易于人阅读和编写，同时也易于机器解析和生成，并有效地提升网络传输效率。

## JSON工具类（自用） ##

![在这里插入图片描述][3b98ce95400b41059f5047039afaeb6c.png]

## 一、第一种 ##

### ComonPage.java：用来封装PageHelper分页插件的数据 ###

package com.attendance.common;
    
    import com.github.pagehelper.PageInfo;
    import lombok.Data;
    
    import java.util.List;
    
    @Data
    public class CommonPage<T> {
        
        //当前页
        private int pageNum;
        //每页的数量
        private int pageSize;
        //当前页的数量
        private int size;
    
        //总记录数
        private long total;
    
        //总页数
        private int pages;
    
        //是否为第一页
        private boolean isFirstPage = false;
    
        //是否为最后一页
        private boolean isLastPage = false;
    
        //是否有前一页
        private boolean hasPreviousPage = false;
    
        //是否有下一页
        private boolean hasNextPage = false;
    
        //结果集
        private List<T> list;
    
        public static <T> CommonPage<T> restPage(List<T> list) {
        
            CommonPage<T> result = new CommonPage();
            PageInfo<T> pageInfo = new PageInfo(list);
            result.setPages(pageInfo.getPages());
            result.setPageNum(pageInfo.getPageNum());
            result.setPageSize(pageInfo.getPageSize());
            result.setSize(pageInfo.getSize());
            result.setTotal(pageInfo.getTotal());
            result.setFirstPage(pageInfo.isIsFirstPage());
            result.setHasNextPage(pageInfo.isHasNextPage());
            result.setHasPreviousPage(pageInfo.isHasPreviousPage());
            result.setLastPage(pageInfo.isIsLastPage());
            result.setList(pageInfo.getList());
            return result;
        }
    }

#### 就是用来封装下面这样的数据 ####

//    根据条件查学生信息
        @Override
        public CommonResult selectStudent(Student student, Pages pages) {
        
            PageHelper.startPage(pages.getPage(),pages.getNum());
            return CommonResult.success(CommonPage.restPage(studentMapper.selectStudent(student)));
        }

#### Pages.java：用来装分页插件需要的数据 ####

package com.attendance.pojo;
    
    import lombok.Data;
    
    @Data
    public class Pages {
        
        private int page = 1;//第几页
        private int num = 5;//每页几条数据
    }

### CommonResult.java：封装JSON的工具类 ###

package com.attendance.common;
    
    import lombok.Data;
    
    @Data
    public class CommonResult<T> {
        
        private long code;
        private String message;
        private boolean flag;
        private T data;
    
        protected CommonResult() {
        
        }
    
        protected CommonResult(long code, boolean flag, String message, T data) {
        
            this.code = code;
            this.flag = flag;
            this.message = message;
            this.data = data;
        }
    
        public CommonResult(long code, boolean flag, String message) {
        
            this.code = code;
            this.flag = flag;
            this.message = message;
        }
    
        public static <T> CommonResult<T> success(T data) {
        
            return new CommonResult(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getFlag(), ResultCode.SUCCESS.getMessage(), data);
        }
    
        public static <T> CommonResult<T> success(T data, String message) {
        
            return new CommonResult(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getFlag(), message, data);
        }
    
        public static <T> CommonResult<T> success(String message) {
        
            return new CommonResult(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getFlag(), message);
        }
    
        public static <T> CommonResult<T> failed(IErrorCode errorCode) {
        
            return new CommonResult(errorCode.getCode(), errorCode.getFlag(), errorCode.getMessage(), (Object)null);
        }
    
        public static <T> CommonResult<T> failed(IErrorCode errorCode, String message) {
        
            return new CommonResult(errorCode.getCode(), errorCode.getFlag(), message, (Object)null);
        }
    
        public static <T> CommonResult<T> failed(String message) {
        
            return new CommonResult(ResultCode.FAILED.getCode(), ResultCode.FAILED.getFlag(), message, (Object)null);
        }
    
        public static <T> CommonResult<T> failed() {
        
            return failed((IErrorCode)ResultCode.FAILED);
        }
    
        public static <T> CommonResult<T> validateFailed() {
        
            return failed((IErrorCode)ResultCode.VALIDATE_FAILED);
        }
    
        public static <T> CommonResult<T> validateFailed(String message) {
        
            return new CommonResult(ResultCode.VALIDATE_FAILED.getCode(), ResultCode.VALIDATE_FAILED.getFlag(), message, (Object)null);
        }
    
        public static <T> CommonResult<T> unauthorized(T data) {
        
            return new CommonResult(ResultCode.UNAUTHORIZED.getCode(), ResultCode.UNAUTHORIZED.getFlag(), ResultCode.UNAUTHORIZED.getMessage(), data);
        }
    
        public static <T> CommonResult<T> forbidden(T data) {
        
            return new CommonResult(ResultCode.FORBIDDEN.getCode(), ResultCode.FORBIDDEN.getFlag(), ResultCode.FORBIDDEN.getMessage(), data);
        }
    }

### IErrorCode：存放数据的接口 ###

package com.attendance.common;
    
    public interface IErrorCode {
        
        long getCode();
    
        boolean getFlag();
    
        String getMessage();
    }

### ResultCode.java：存放数据的实现类 ###

package com.attendance.common;
    
    public enum ResultCode implements IErrorCode {
        
        SUCCESS(200L, true, "操作成功"),
        FAILED(500L, false, "操作失败"),
        VALIDATE_FAILED(404L, false, "参数检验失败"),
        UNAUTHORIZED(401L, false, "暂未登录或token已经过期"),
        FORBIDDEN(403L, false, "没有相关权限");
    
        private long code;
        private boolean flag;
        private String message;
    
        private ResultCode(long code, boolean flag, String message) {
        
            this.code = code;
            this.flag = flag;
            this.message = message;
        }
    
        public long getCode() {
        
            return this.code;
        }
    
        public boolean getFlag() {
        
            return this.flag;
        }
    
        public String getMessage() {
        
            return this.message;
        }
    }

## 具体操作代码 ##

### Service： ###

就是让方法的返回值变成`CommonResult`

//    新增学生信息
        @Override
        public CommonResult selectStudentById(int id) {
        
            Student student = studentMapper.selectStudentById(id);
            return CommonResult.success(student,"查询成功！");
        }
    
        //    更改学生状态
        @Override
        public CommonResult updateStudentInfo(Student student) {
        
            int i = studentMapper.updateStudentInfo(student);
            if (i==1){
        
                return CommonResult.success("修改信息成功！");
            }else {
        
                return CommonResult.failed("修改数据失败！");
            }
        }

### Controller： ###

//    更新学生基本信息
        @PostMapping("/updateStudentInfo")
        public CommonResult updateStudentInfo(@RequestBody Student student){
        
            return studentService.updateStudentInfo(student);
        }
    
    //    更改学生状态
        @PostMapping("/modifyStudentStatus")
        public CommonResult modifyStudentStatus(@RequestBody Student student){
        
            return studentService.modifyStudentStatus(student);
        }

## 发送JSON后的返回值（测试），这里我是那我另一个项目做的测试，反正返回值就是这个样子，工具类都可以调整，这里我用了Mybatis-Plus的分页插件，所以都没有使用CommonPage ##

{
        
        "code": 0,
        "message": "查询成功！",
        "flag": true,
        "data": [
            {
        
                "id": 1,
                "stuName": "苏文绩",
                "stuNative": "重庆市铜梁区",
                "stuSex": "男",
                "stuPhone1": "17782299402",
                "stuPhone2": "19112799705",
                "classType": "文科",
                "stuIdentity": "500224200012050053",
                "stuAddress": "重庆市铜梁区东城街道玉泉花苑5-12-3",
                "specialType": "单亲家庭",
                "stuScore": "502",
                "stuMajor1": "软件工程",
                "stuMajor2": "计算机科学与技术",
                "status": 0,
                "contactContent": "",
                "version": 1,
                "createTime": "2022-06-23T09:50:26.000+00:00",
                "updateTime": "2022-06-27T03:55:51.000+00:00",
                "deleted": false
            },
            {
        
                "id": 2,
                "stuName": "谢汝雄",
                "stuNative": "重庆市江津区",
                "stuSex": "男",
                "stuPhone1": "17353192303",
                "stuPhone2": "11651561651",
                "classType": "文科",
                "stuIdentity": "500244200007031125",
                "stuAddress": "重庆市江津区",
                "specialType": "孤儿",
                "stuScore": "600",
                "stuMajor1": "自动化",
                "stuMajor2": "艺术与科技",
                "status": 1,
                "contactContent": "adasd",
                "version": 1,
                "createTime": "2022-06-23T09:52:18.000+00:00",
                "updateTime": "2022-06-27T04:42:21.000+00:00",
                "deleted": false
            },
            {
        
                "id": 3,
                "stuName": "张幸",
                "stuNative": "重庆市万州区",
                "stuSex": "男",
                "stuPhone1": "173151515",
                "stuPhone2": "12.1.21.1.15.15",
                "classType": "理科",
                "stuIdentity": "56156165165",
                "stuAddress": "重庆市万州区",
                "specialType": "孤儿,优扶家庭子女,家庭突发重大变故",
                "stuScore": "504",
                "stuMajor1": "计算机科学与技术",
                "stuMajor2": "艺术与科技",
                "status": 0,
                "contactContent": "",
                "version": 1,
                "createTime": "2022-06-23T09:53:06.000+00:00",
                "updateTime": "2022-06-26T08:47:18.000+00:00",
                "deleted": false
            },
            {
        
                "id": 4,
                "stuName": "赵云",
                "stuNative": "124124",
                "stuSex": "男",
                "stuPhone1": "12124124",
                "stuPhone2": "12512512",
                "classType": "1",
                "stuIdentity": "124124",
                "stuAddress": "123123123",
                "specialType": "孤儿,烈士子女,优扶家庭子女,建档立卡贫困家庭学生",
                "stuScore": "124124",
                "stuMajor1": "通信工程",
                "stuMajor2": "自动化",
                "status": 0,
                "contactContent": "",
                "version": 1,
                "createTime": "2022-06-23T10:29:57.000+00:00",
                "updateTime": "2022-06-26T08:52:32.000+00:00",
                "deleted": false
            },
            {
        
                "id": 5,
                "stuName": "张三",
                "stuNative": "重庆",
                "stuSex": "男",
                "stuPhone1": "12124",
                "stuPhone2": "12412",
                "classType": "1",
                "stuIdentity": "500224",
                "stuAddress": "124125125",
                "specialType": "孤儿,烈士子女,优扶家庭子女,建档立卡贫困家庭学生",
                "stuScore": "654",
                "stuMajor1": "市场营销",
                "stuMajor2": "信息工程",
                "status": 0,
                "contactContent": "",
                "version": 1,
                "createTime": "2022-06-23T11:02:43.000+00:00",
                "updateTime": "2022-06-26T09:18:58.000+00:00",
                "deleted": false
            }
        ],
        "count": 21
    }

## 二、第二种 ##

![在这里插入图片描述][56e94f27a54448f4ac20e02e5adbbbac.png]

### R.java ###

package com.zdsoft.datafactory.common;
    
    
    import com.zdsoft.datafactory.common.enums.ResultCodeEnum;
    
    /**
     * 接口通用的返回对象。
     * @author 李川东
     * */
    
    public final class R<T> {
        
        private  int code;
        private  String msg ;
        private  T data;
    
        public R(){
        
    
        }
    
        public R(int code){
        
            this.code = code;
            this.msg = "";
            this.data = null;
        }
    
        public R(int code,String msg){
        
            this.code = code;
            this.msg = msg;
            this.data = null;
        }
    
        public R(int code,String msg,T data){
        
            this.code = code;
            this.msg = msg;
            this.data = data;
        }
    
        public void setCode(int code) {
        
            this.code = code;
        }
    
        public void setMsg(String msg) {
        
            this.msg = msg;
        }
    
        public void setData(T data) {
        
            this.data = data;
        }
    
        public int getCode() {
        
            return code;
        }
    
    
    
        public String getMsg() {
        
            return msg;
        }
    
        public T getData() {
        
            return data;
        }
    
        public static R Success(Object data){
        
            return new R(ResultCodeEnum.SUCCESS.getCode(), ResultCodeEnum.SUCCESS.getMessage(),data);
        }
    
        public static R Success(String message,Object data){
        
            return new R(ResultCodeEnum.SUCCESS.getCode(), message,data);
        }
    
        public static R Success(){
        
            return Success("");
        }
    
    
        public static R Failed(String msg){
        
            return new R(ResultCodeEnum.SYSTEM_EXCEPTION.getCode(),msg);
        }
        public static R Failed(){
        
            return Failed("Failed");
        }
    
        public static R Failed(int code,String msg){
        
             return new R(code,msg);
        }
    
    
        public boolean succeeded(){
        
            return getCode() == ResultCodeEnum.SUCCESS.getCode();
        }
    
    
        public boolean failed(){
        
            return getCode() != ResultCodeEnum.SUCCESS.getCode();
        }
    
    }

### ResultCodeEnum.java ###

package com.zdsoft.datafactory.common.enums;
    
    import com.zdsoft.datafactory.common.R;
    
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * @Author lichuandong
     * @Date 2021/1/5
     */
    @SuppressWarnings("AlibabaEnumConstantsMustHaveComment")
    public enum ResultCodeEnum {
        
    
        SUCCESS(100200, "返回成功"),
        SYSTEM_EXCEPTION(100500, "系统异常"),
        REQUEST_PARAM_ERROR(100401,"请求参数错误"),
        REQUEST_OUT_OVERTIME(100408,"请求超时"),
        REQUEST_NOT_FOUND(100404,"请求的资源或服务未找到"),
        REQUEST_LENGTH_LIMIT(100414,"请求URI太长"),
        REQUEST_Format_NOT_SUPPORTED(100415,"请求的格式不支持"),
        TOKEN_EXPIRED_REDIRECT(100302,"token过期,请重新登录"),
    
    
        INTERFACE_BASIC_INFORMATION_NULL(100001, "接口基本信息为空"),
        INTERFACE_NAME_NULL(100002, "接口名称为空"),
        INTERFACE_SOURCE_NULL(100005, "接口来源为空"),
        INTERFACE_PROTOCOL_NULL(100003, "接口协议为空"),
        INTERFACE_NOT_ENABLED(100123, "接口未启用"),
        INTERFACE_IP_PORT_NULL(100012, "ip和端口为空"),
        INTERFACE_PATH_NULL(100004, "接口路径为空"),
        INTERFACE_REQUEST_METHOD_NULL(100008, "接口请求方式"),
        REQUEST_TIMEOUT(100014, "超时时限为空"),
        REQUEST_PARAM_NULL(100012, "请求参数为空"),
        INTERFACE_BASE_NOT_FOUND(100013, "未找到该条接口基本信息"),
        INTERFACE_SETTING_NOT_FOUND(100015, "未找到该条接口配置信息"),
        INTERFACE_BASE_EXIST(100026, "接口基本信息已存在"),
        INTERFACE_BASE_NOT_EXIST(100025, "接口基本信息不存在"),
        INTERFACE_SETTING_EXIST(100027, "接口配置信息已存在"),
        INTERFACE_SETTING_NOT_EXIST(100028, "接口配置信息不存在"),
        INTERFACE_PATH_ILLEGAL(100009, "接口路径不符合规范"),
        REQUIRED_FIELD_IS_BLANK(100007, "入参必填字段为空： "),
        REQUEST_OUT_API_FAIL(100018, "请求外部接口失败，返回状态码："),
        REQUEST_OUT_GET_OVERTIME(100019, "GET请求外部接口失败，请求超时"),
        REQUEST_OUT_POST_OVERTIME(100020, "POST请求外部接口失败，请求超时"),
        REQUEST_OUT_PUT_OVERTIME(100021, "PUT请求外部接口失败，请求超时"),
        REQUEST_OUT_DELETE_OVERTIME(100022, "DELETE请求外部接口失败，请求超时"),
        OTHER_METHODS_NOT_SUPPORTED(100023, "现阶段不支持其他请求方式"),
        PARAM_BODY_CONTENT_ERROR(100024, "请求body不是json格式"),
        SPLICING_PARAM_IS_FAIL(100031, "拼接GET请求入参出错，请检查参数"),
       ;
    
        /**
         * 枚举值
         */
        private final Integer code;
    
        /**
         * 枚举描述
         */
        private final String message;
    
        /**
         * 构造一个<code>LocalCacheEnum</code>枚举对象
         *
         * @param code 枚举值
         * @param message 枚举描述
         */
        ResultCodeEnum(Integer code, String message) {
        
            this.code = code;
            this.message = message;
        }
        public Integer getCode() {
        
            return code;
        }
    
        public String getMessage() {
        
            return message;
        }
    
        public <T> R<T> result(){
        
            return new R(getCode(),getMessage());
        }
        public <T>  R<T> result(String message){
        
            return new R(getCode(),message);
        }
        /**将返回码标准的信息 填充到message里面，message必须包含一个%s*/
        public <T>  R<T> resultFillingMessage(String message){
        
            return new R(getCode(),String.format(message,getMessage()));
        }
    
    
        /**将message添加到返回码标准的信息后面 再返回{@link R}*/
        public <T> R<T> resultAppendMessage(String message){
        
            return new R(getCode(),getMessage()+message);
        }
    
    
    
        /**
         * 获取全部枚举
         *
         * @return List<LocalCacheEnum>
         */
        public static List<ResultCodeEnum> getAllEnum() {
        
            List<ResultCodeEnum> list = new ArrayList<>();
            for (ResultCodeEnum each : values()) {
        
                list.add(each);
            }
            return list;
        }
    
        /**
         * 获取全部枚举值
         *
         * @return List<String>
         */
        public static List<Integer> getAllEnumCode() {
        
            List<Integer> list = new ArrayList<>();
            for (ResultCodeEnum each : values()) {
        
                list.add(each.code);
            }
            return list;
        }
    }

### 使用方法： ###

public R addstopwatch(@RequestBody AddStopWatchVo addStopWatchVo){
        
            try {
        
                if (!IsChineseUtil.isLetterChinese(addStopWatchVo.getsName())){
        
                    return R.Failed("码表名称只能为中文或者英文");
                }
                Boolean flag = iStopWatchValueService.JudgeStopWatchValue(addStopWatchVo.getStopWatchValues());
                if (flag){
        
                    StopWatch stopWatch = iStopWatchService.AddStopWatch(addStopWatchVo.getsName(), addStopWatchVo.getsComment());
                    Long id = stopWatch.getsId();
                    iStopWatchValueService.AddStopWatchValue(addStopWatchVo.getStopWatchValues(),id);
                    return R.Success();
                }else return R.Failed("码值不能重复");
            }catch (Exception e){
        
                return R.Failed("码表名称不能重复");
            }
        }

### 返回值： ###

{
        
      "code": 100200,
      "msg": "返回成功",
      "data": ""
    }

[3b98ce95400b41059f5047039afaeb6c.png]: https://img-blog.csdnimg.cn/3b98ce95400b41059f5047039afaeb6c.png
[56e94f27a54448f4ac20e02e5adbbbac.png]: https://img-blog.csdnimg.cn/56e94f27a54448f4ac20e02e5adbbbac.png