SpringMVC实现全局异常捕获处理

需求：在SpringMVC中实现全局异常捕获解析以及处理并且返回json状态码需求分析解决：1、进入Spring-MVC配置文件配置全局异常处理

<!-- 全局异常处理 自定义实现spring的全局异常解析器HandlerExceptionResolver -->

<bean id="exceptionResolver" class="com.xxx.resolver.CustomExceptionResolver"></bean>

2、定义全局异常处理类

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

import org.springframework.web.servlet.HandlerExceptionResolver;

import org.springframework.web.servlet.ModelAndView;

import com.xxx.bean.Result;

import com.xxx.excption.CustomException;

import com.xxx.util.ResultUtils;

/**

* 全局异常处理器

* @author CatalpaFlat

*/

public class CustomExceptionResolver implements HandlerExceptionResolver{

/**日志log*/

private static Logger log = LoggerFactory.getLogger(CustomExceptionResolver.class);

//系统抛出的异常

@Override

public ModelAndView resolveException(HttpServletRequest request,

  HttpServletResponse response, Object handler, Exception ex) {  

   //handler就是处理器适配器要执行的Handler对象(只有method)  

   //解析出异常类型。  

	/*  使用response返回*/  

   response.setStatus(HttpStatus.OK.value()); //设置状态码  

   response.setContentType(MediaType.APPLICATION_JSON_VALUE); //设置ContentType  

   response.setCharacterEncoding("UTF-8"); //避免乱码  

   response.setHeader("Cache-Control", "no-cache, must-revalidate");  

   //如果该 异常类型是系统 自定义的异常，直接取出异常信息。  

   CustomException customException=null;  

   try {

	   if(ex instanceof CustomException){  

	  customException = (CustomException)ex;  

	  //错误信息  

response.getWriter().write(ResultUtils.error(customException.getCode(),ex.getMessage()).toString());

	   }else

	   	response.getWriter().write(ResultUtils.error(-1,ex.getMessage()).toString());

} catch (IOException e) {

  log.error("与客户端通讯异常:"+ e.getMessage(), e);  

e.printStackTrace();

}

   ModelAndView modelAndView=new ModelAndView();  

   return modelAndView;  

}

}

3、自定义异常类CustomException

import com.xxx.enums.ResultEnum;

/**

* 自定义异常类型

* @author CatalpaFlat

*/

public class CustomException extends Exception {

private Integer code;

public CustomException(){}

public CustomException(ResultEnum resultEnum) {

	super((resultEnum.getMsg()));

   this.code = resultEnum.getCode();

}

public Integer getCode() {

   return code;

}

public void setCode(Integer code) {

   this.code = code;

}

}

4、定义Http响应json类

/** 

* http请求返回的最外层

* Created by CatalpaFlat

* on 2017/4/12.

*/

public class Result<T> {

private Integer code;

private String msg;

private T data;

public Integer getCode() {

   return code;

}

public void setCode(Integer code) {

   this.code = code;

}

public String getMsg() {

   return msg;

}

public void setMsg(String msg) {

   this.msg = msg;

}

public T getData() {

   return data;

}

public void setData(T data) {

   this.data = data;

}

@Override

public String toString() {

return "{\"code\": "+code+",\"msg\": \""+msg+"\",\"data\": "+data+"}";

}

}

5、定义http返回json的ResulUtils

import com.xxx.bean.Result;

/** 

* http请求返回success以及error方法封装

* Created by CatalpaFlat

* on 2017/4/12.

*/

public class ResultUtils {

private static final String SUCCESS_MSG = "成功";

/**

* http回调成功

* @param object

* @return

*/

public  static Result success(Object object){

   Result result = new Result();

   result.setCode(1);

   result.setMsg(SUCCESS_MSG);

   result.setData(object);

   return result;

}

/**

* 无object返回

* @return

*/

public  static Result success(){

   return success(null);

}

/**

* http回调错误

* @param code

* @param msg

* @return

*/

public static Result error(Integer code,String msg){

   Result result = new Result();

   result.setCode(code);

   result.setMsg(msg);

   return  result;

}

}

6、定义异常类型枚举ResultEnum

/**

* 枚举定义异常类型以及相对于的错误信息

* 有助于返回码的唯一性

* Created by CatalpaFlat 

* on 2017/4/12.

*/

public enum ResultEnum {

UNKONW_ERROR(-1,"未知错误"),

SUCCESS(0,"成功"),

TEST_ERRORR(100,"测试异常")

;private Integer code;

private String msg;

ResultEnum(Integer code,String msg){

   this.code = code;

   this.msg = msg;

}

public Integer getCode() {

   return code;

}

public String getMsg() {

   return msg;

}

}

7、测试TestController

@Controller

@RequestMapping("/teco")

public class TestController {

@RequestMapping(value = "/testexc",method = RequestMethod.GET)

@ResponseBody

public void testException() throws CustomException{

throw new CustomException(ResultEnum.TEST_ERRORR);

}

}

8、测试接口json返回