全局异常处理器

系统抛出一个不可预知的异常，也需要给出相应的提示信息

这里分为程序员主动抛出的异常

package com.heima.common.exception;

import com.heima.model.common.enums.AppHttpCodeEnum;

public class CustomException extends RuntimeException {

    private AppHttpCodeEnum appHttpCodeEnum;

    public CustomException(AppHttpCodeEnum appHttpCodeEnum){
        this.appHttpCodeEnum = appHttpCodeEnum;
    }

    public AppHttpCodeEnum getAppHttpCodeEnum() {
        return appHttpCodeEnum;
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

和程序不可预知的异常

package com.heima.common.exception;


import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

@ControllerAdvice  //控制器增强类
@Slf4j
public class ExceptionCatch {

    /**
     * 处理不可控异常
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public ResponseResult exception(Exception e){
        e.printStackTrace();
        log.error("catch exception:{}",e.getMessage());

        return ResponseResult.errorResult(AppHttpCodeEnum.SERVER_ERROR);
    }

    /**
     * 处理可控异常  自定义异常
     * @param e
     * @return
     */
    @ExceptionHandler(CustomException.class)
    @ResponseBody
    public ResponseResult exception(CustomException e){
        log.error("catch exception:{}",e);
        return ResponseResult.errorResult(e.getAppHttpCodeEnum());
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

程序员主动抛出的异常可以使用枚举类来定义响应的提示信息

package com.heima.model.common.enums;

public enum AppHttpCodeEnum {

    // 成功段固定为200
    SUCCESS(200,"操作成功"),
    // 登录段1~50
    NEED_LOGIN(1,"需要登录后操作"),
    LOGIN_PASSWORD_ERROR(2,"密码错误"),
    // TOKEN50~100
    TOKEN_INVALID(50,"无效的TOKEN"),
    TOKEN_EXPIRE(51,"TOKEN已过期"),
    TOKEN_REQUIRE(52,"TOKEN是必须的"),
    // SIGN验签 100~120
    SIGN_INVALID(100,"无效的SIGN"),
    SIG_TIMEOUT(101,"SIGN已过期"),
    // 参数错误 500~1000
    PARAM_REQUIRE(500,"缺少参数"),
    PARAM_INVALID(501,"无效参数"),
    PARAM_IMAGE_FORMAT_ERROR(502,"图片格式有误"),
    SERVER_ERROR(503,"服务器内部错误"),
    // 数据错误 1000~2000
    DATA_EXIST(1000,"数据已经存在"),
    AP_USER_DATA_NOT_EXIST(1001,"ApUser数据不存在"),
    DATA_NOT_EXIST(1002,"数据不存在"),
    // 数据错误 3000~3500
    NO_OPERATOR_AUTH(3000,"无权限操作"),
    NEED_ADMIND(3001,"需要管理员权限");

    int code;
    String errorMessage;

    AppHttpCodeEnum(int code, String errorMessage){
        this.code = code;
        this.errorMessage = errorMessage;
    }

    public int getCode() {
        return code;
    }

    public String getErrorMessage() {
        return errorMessage;
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

而不可预知的异常也需要给出返回响应信息

这里有两个注解：
@ControllerAdvice：定义一个切面来拦截需要拦截的异常
@ExceptionHandler(Exception.class)：定义异常类