后端准备步骤:结果的封装和异常的捕获

结果的封装

package com.lzy.common.lang;

import lombok.Data;

import java.io.Serializable;

@Data
public class Result implements Serializable {
    private int code; // 200
    private String msg;
    private Object data;

    public static Result success(Object data) {
        return success(200, "操作成功", data);
    }

    public static Result success(int code, String msg, Object data) {
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        result.setData(data);
        return result;
    }
    public static Result fail(String msg) {
        return fail(400, msg, null);
    }
    public static Result fail(String msg, Object data) {
        return fail(400, msg, data);
    }
    public static Result fail(int code, String msg, Object data) {
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        result.setData(data);
        return result;
    }

}

异常的捕获

package com.lzy.exception;

import com.lzy.common.lang.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.nio.file.AccessDeniedException;
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {

    @ResponseStatus(HttpStatus.FORBIDDEN)
    @ExceptionHandler(value = AccessDeniedException.class)
    public Result handler(AccessDeniedException e) {
        log.info("security权限不足：----------------{}", e.getMessage());
        return Result.fail("权限不足");
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public Result handler(MethodArgumentNotValidException e) {
        log.info("实体校验异常：----------------{}", e.getMessage());
        BindingResult bindingResult = e.getBindingResult();
        ObjectError objectError = bindingResult.getAllErrors().stream().findFirst().get();
        return Result.fail(objectError.getDefaultMessage());
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = IllegalArgumentException.class)
    public Result handler(IllegalArgumentException e) {
        log.error("Assert异常：----------------{}", e.getMessage());
        return Result.fail(e.getMessage());
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = RuntimeException.class)
    public Result handler(RuntimeException e) {
        log.error("运行时异常：----------------{}", e);
        return Result.fail(e.getMessage());
    }
}