Springboot处理全局异常和自定义异常

1.添加pom

        
             <!--springboot2.1.5版本-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.github.ulisesbocchio</groupId>
            <artifactId>jasypt-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

       <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

2.设置统一返回类型工具类

package com.example.util;

import lombok.Data;

import java.util.HashMap;
import java.util.Map;

@Data
public class ReturnResult {

	private Boolean success;

	private Integer code;

	private String message;

	private Map<String, Object> data = new HashMap<>();

	private ReturnResult(){}

	public static ReturnResult ok(){
		ReturnResult returnResult = new ReturnResult();
		returnResult.setSuccess(ResultCodeEnum.SUCCESS.getSuccess());
		returnResult.setCode(ResultCodeEnum.SUCCESS.getCode());
		returnResult.setMessage(ResultCodeEnum.SUCCESS.getMessage());
		return returnResult;
	}

	public static ReturnResult error(){
		ReturnResult returnResult = new ReturnResult();
		returnResult.setSuccess(ResultCodeEnum.ERROR.getSuccess());
		returnResult.setCode(ResultCodeEnum.ERROR.getCode());
		returnResult.setMessage(ResultCodeEnum.ERROR.getMessage());
		return returnResult;
	}

	public static ReturnResult setResult(ResultCodeEnum resultCodeEnum){
		ReturnResult returnResult = new ReturnResult();
		returnResult.setSuccess(resultCodeEnum.getSuccess());
		returnResult.setCode(resultCodeEnum.getCode());
		returnResult.setMessage(resultCodeEnum.getMessage());
		return returnResult;
	}

	public ReturnResult success(Boolean success){
		this.setSuccess(success);
		return this;
	}

	public ReturnResult message(String message){
		this.setMessage(message);
		return this;
	}

	public ReturnResult code(Integer code){
		this.setCode(code);
		return this;
	}

	public ReturnResult data(String key, Object value){
		this.data.put(key, value);
		return this;
	}

	public ReturnResult data(Map<String, Object> map){
		this.setData(map);
		return this;
	}
}

3.设置code工具类

package com.example.util;
import lombok.Getter;

@Getter
public enum ResultCodeEnum {

	SUCCESS(true, 200,"成功"),
	ERROR(false,500,"服务器发现异常"),
	UNKNOWN_REASON(false, 505, "未知错误"),
	BAD_SQL_GRAMMAR(false, 303, "sql语法错误"),
	JSON_PARSE_ERROR(false, 221, "json解析异常"),
	PARAM_ERROR(false, 210, "参数不正确"),
	FILE_UPLOAD_ERROR(false, 233, "文件上传错误,选择正确的格式"),
	EXCEL_DATA_IMPORT_ERROR(false, 215, "Excel数据导入错误"),
	ARITHMETIC_ERROR(false,211,"算数异常！不能除0"),
	TEACHER_NULL_ERROR(false, 500, "没有该讲师，请重新输入！"),
	FILE_NULL_ERROR(false,500,"文件内容不正确"),
	FETCH_PLAYAUTH_ERROR(false,404,"播放错误"),
	NULL_ERROR(false,500,"空指针异常")
	;


	private Boolean success;

	private Integer code;

	private String message;

	private ResultCodeEnum(Boolean success, Integer code, String message) {
		this.success = success;
		this.code = code;
		this.message = message;
	}
}

4.设置捕捉全局异常类

@ControllerAdvice
@Slf4j
@ResponseBody
public class ExceptionHandlers {

    @ExceptionHandler(Exception.class)
    public ReturnResult error(Exception e){

        String failMsg=null;
        e.printStackTrace();
        if (e instanceof BindException){
            failMsg = ((BindException) e).getBindingResult().getFieldError().getDefaultMessage();
            return   ReturnResult.error().data("服务器出现异常:",failMsg);
        }
        return  ReturnResult.error().data("发现异常信息为:",e.getMessage());
    }
}

5.设置自定义异常类

@Slf4j
@Data
public class LinliException extends  RuntimeException {


    private Integer code;

  public LinliException(Integer code, String message) {
        super(message);
        this.code=code;
    }

   public LinliException(ResultCodeEnum resultCodeEnum){
        super(resultCodeEnum.getMessage());
        log.error(resultCodeEnum.getMessage());
        this.code=resultCodeEnum.getCode();
    }

    @Override
    public String toString() {
        return "GuliException{" +
                "message=" + this.getMessage() +
                ", code=" + code +
                '}';
    }
}

6.编写controller测试

   @RestController
    public class ExceptionController {
    @RequestMapping("/excption")
    public  ReturnResult  Excption(){
           int a=12/0;
        return ReturnResult.ok();
    }

    @GetMapping("/excption2/{name}")
    public ReturnResult returnResult(@PathVariable("name") String name){
            if (!"zhangsan".equals(name)){
                GuliException exception = new GuliException(ResultCodeEnum.TEACHER_NULL_ERROR);
                return ReturnResult.error().message(exception.getMessage());
                // new GuliException(500,"没有该名字！");
            }
      return   ReturnResult.ok();
    }
}

7.访问地址测试