SpringBoot 全局异常处理

      在项目运行过程当中,是否是各类异常,若是咱们每一个都须要用 try{}catch(Exception e){}  的话,那么就会写特别特别多的重复代码,就会显得很是low,因此Spring为咱们提供了全局异常处理机制,咱们只须要往外抛异常就能够了:

1: 自定义异常类(没有不影响,只演示一下)

package com.gy.demo.common.handler;

/**
 * Description: 参数异常类
 *
 * @author geYang
 * @since 2017/12/28
 **/
public class ParamException extends RuntimeException {
	private int code;
	
	public ParamException(ResultEnum resultEnum){
		super(resultEnum.getMessage());
		this.code = resultEnum.getCode();
	}
	
	public int getCode () {
		return code;
	}
	
	public void setCode (int code) {
		this.code = code;
	}
}

2: 自定义返回状态枚举

package com.gy.demo.common.handler;

/**
 * Description: 返回结果状态码
 *
 * @author geYang
 * @since 2017/12/28
 **/
public enum ResultEnum {
	PARAM_NULL(401,"参数为空"),
	PARAM_ERROR(402,"参数异常"),
	
	SUCCESS(200,"SUCCESS"),
	RETURN_NULL(201,"返回值为空"),
	;
	
	private int code;
	private String message;
	
	ResultEnum (int code, String message) {
		this.code = code;
		this.message = message;
	}
	
	public int getCode () {
		return this.code;
	}
	
	public String getMessage () {
		return this.message;
	}
	
	
}

3: 自定义返回状态类:

package com.gy.demo.common.handler;

import org.springframework.http.HttpStatus;

import java.util.HashMap;

/**
 * Description: 请求返回状态类
 *
 * @author geYang
 * @since 2017/12/18
 **/
public class R extends HashMap<String, Object> {
	
	public R() {
		put("code", HttpStatus.OK.value());
	}
	
	public R (ParamException paramException) {
		put("code", paramException.getCode());
		put("msg", paramException.getMessage());
	}
	
	public static R error () {
		return error( HttpStatus.INTERNAL_SERVER_ERROR.value(), "未知异常，请联系管理员");
	}
	
	public static R error (String msg) {
		return error(HttpStatus.INTERNAL_SERVER_ERROR.value(),msg);
	}
	
	public static R error(int code, String msg) {
		R r = new R();
		r.put("code", code);
		r.put("msg", msg);
		return r;
	}
	
	public static R ok(Object data) {
		R r = new R();
		r.put("data", data);
		return r;
	}

}

4: 异常处理类

package com.gy.demo.common.handler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Description: 全局异常处理类
 *
 * @author geYang
 * @since 2017/12/28
 **/
@ControllerAdvice
public class ExceptHandler {
	private Logger logger = LoggerFactory.getLogger(ExceptHandler.class);
	@ResponseBody
	@ExceptionHandler(value = Exception.class)
	public R doExceptHandler(Exception e){
		/* 判断异常是否为自定义异常 */
		if(e instanceof ParamException){
			ParamException p = (ParamException) e;
			return R.error(p.getCode(),p.getMessage());
		} else {
			logger.error("系统异常",e);
			return R.error(e.getMessage());
		}
	}


}

5: 测试:

@GetMapping("/test/{id}")
	public Object test(Integer id) throws Exception{
		if(id<5){
			throw new ParamException(ResultEnum.PARAM_ERROR);
		} else if (id<10) {
		
		}
		return R.ok(null);
	}

    参考大神: https://www.imooc.com/video/14341

    项目源码: https://gitee.com/ge.yang/SpringBoot