Java自訂異常資訊

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　　通常在開發過程中，會遇到很多異常，對於一些知道異常的原因，這時候想要返回給瀏覽器，就需要自訂系統的異常

1、Spring  注入異常處理類

<bean id ="commonExceptionHandler" class = "com..test.common.exception.handler.CommonExceptionHandler">

2、注入的異常處理類,主要是重寫resolveException方法

import java.io.IOException;import java.io.PrintWriter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.ModelAndView;import com.test.common.constant.ERRORConstants;import com.test.common.constant.GlobalConstants;import com.test.common.dto.ResultDTO;import com.test.common.exception.ServiceException;import com.test.common.exception.SysException;import com.test.common.util.SpringContextHolder;import com.test.common.util.StringUtil;public class CommonExceptionHandler implements HandlerExceptionResolver {    private static final Logger LOG = LoggerFactory.getLogger(CommonExceptionHandler.class);    /**     * @param request 參數     * @param response 參數     * @param obj 參數     * @param e 參數     * @return modelview     */    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object obj,            Exception e) {        ResultDTO result;        if (e instanceof SysException) {            result = handleSysException((SysException) e);        } else if (e instanceof ServiceException) {            result = handleServiceException((ServiceException) e);        } else {            result = handleSysException(new SysException(ERRORConstants.COMMON_SYSTEM_ERROR, e));        }        responseOutWithJson(response, result);        return new ModelAndView();    }
    private ResultDTO handleSysException(SysException ex) {        ResultDTO result = new ResultDTO();        result.setCode(ex.getCode());        if(StringUtil.isNotEmpty(ex.getMsg())){        result.setMessage(ex.getMsg());//這裡擷取的是自己設定的資訊        }else {         result.setMessage(SpringContextHolder.getMessage(ex.getCode(), null));}        LOG.error(new StringBuilder().append(result.getCode()).append(result.getMessage()).toString(), ex);        return result;    }            private ResultDTO handleServiceException(ServiceException ex) {        ResultDTO result = new ResultDTO();        result.setCode(ex.getCode());        result.setMessage(SpringContextHolder.getMessage(ex.getCode(), null));        LOG.error(new StringBuilder().append(result.getCode()).append(result.getMessage()).toString());        return result;    }    protected void responseOutWithJson(HttpServletResponse response, Object responseObject) {        JSONObject responseJSONObject = JSONObject.fromObject(responseObject);        String jsonString = responseJSONObject.toString();        response.setCharacterEncoding(GlobalConstants.DEFAULT_ENCODING);        response.setContentType("application/json; charset=utf-8");        PrintWriter out = null;        try {            out = response.getWriter();            out.append(jsonString);            LOG.debug("返回是\n");            LOG.debug(jsonString);        } catch (IOException e) {            LOG.debug("Error responseOutWithJson");        } finally {            if (out != null) {                out.close();            }        }    }}

　3、自訂系統異常類

package com.test.common.exception.base;public class BaseCommonException extends RuntimeException {    private static final long serialVersionUID = 1L;    private String code;    private String msg;//用於存放異常資訊    /**     * 建構函式     */    public BaseCommonException() {        super();    }    /**     *      * @param cause 參數     */    public BaseCommonException(Throwable cause) {        super(cause);    }        /**     *      * @param code 參數     */    public BaseCommonException(String code) {        this.setCode(code);    }    /**     *      * @param code 參數     * @param e 參數     */    public BaseCommonException(String code, Throwable e) {        super(e);        this.setCode(code);    }        /**     *      * @param code 參數     * @param e 參數     */    public BaseCommonException(String code, Throwable e,String msg) {        super(e);        this.setCode(code);        this.setMsg(msg);    }    /**     *      * @return code     */    public String getCode() {        return code;    }    /**     *      * @param code 參數     */    public void setCode(String code) {        this.code = code;    }    /**     *      * @return msg     */    public String getMsg() {        return msg;    }    /**     *      * @param msg 參數     */    public void setMsg(String msg) {        this.msg = msg;    }    }

4、Service類

    public boolean test() {        String msg = "";        try {                        msg = "自訂資訊";            return true;        } catch (Exception e) {            throw new BaseCommonException("300",e,                    "失敗資訊："+msg);        }    }    

 

Java自訂異常資訊