springBoot全局返回类型与错误处理

springBoot在会因返回数据类型不同而难以处理，为此定义全局返回类型Result：

点击查看代码

package com.demo.common;

public class Result {

    private String code;
    private String msg;
    private Object data;

    public static Result success() {
        Result result = new Result();
        result.setCode("200");
        result.setMsg("请求成功");
        return result;
    }

    public static Result success(Object data) {
        Result result = success();
        result.setData(data);
        return result;
    }

    public static Result error() {
        Result result = new Result();
        result.setCode("500");
        result.setMsg("系统错误");
        return result;
    }

    public static Result error(String code, String msg) {
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        return result;
    }

    public String getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

同时定义GlobalExceptionHandler类实现对错误信息的处理：

点击查看代码

package com.demo.exception;


import com.demo.common.Result;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

@ControllerAdvice("com.demo.controller")
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    @ResponseBody // 返回json串
    public Result error(Exception e) {
        e.printStackTrace();
        return Result.error();
    }

    @ExceptionHandler(CustomException.class)
    @ResponseBody // 返回json串
    public Result error(CustomException e) {
        return Result.error(e.getCode(), e.getMsg());
    }

}

由此实现：

再定义CustomException类实现手动添加错误提示：

代码：

点击查看代码

package com.demo.exception;


import com.demo.common.Result;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

@ControllerAdvice("com.demo.controller")
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    @ResponseBody // 返回json串
    public Result error(Exception e) {
        e.printStackTrace();
        return Result.error();
    }

    @ExceptionHandler(CustomException.class)
    @ResponseBody // 返回json串
    public Result error(CustomException e) {
        return Result.error(e.getCode(), e.getMsg());
    }

}