spring mvc的错误控制机制

来源：互联网发布：html怎么写php代码编辑：程序博客网时间：2024/06/05 16:29

先在spring-servlet.xml里面增加了一个exceptionResolver,配置和jspresolver在前缀后缀上有些
关系，所以一起贴出来：
<bean id="jspViewResolver"
   class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="viewClass">
    <value>org.springframework.web.servlet.view.JstlView</value>
   </property>
   <property name="prefix" value="/template/jsp/" />
   <property name="suffix" value=".jsp" />
</bean>

<bean id="exceptionResolver"
   class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
   <property name="defaultErrorView">
    <value>error/defaultError</value>
   </property>
   <property name="exceptionMappings">
    <props>
     <prop
      key="com.sillycat.plugin.commons.exceptions.ManagerException">
      error/managerError
     </prop>
     <prop
      key="com.sillycat.plugin.commons.exceptions.DaoException">
      error/daoError
     </prop>
    </props>
   </property>
</bean>

这样处理就是当遇到ManagerException时会自动转向error/managerError页面
            当遇到DaoException时会自动转向    error/daoError页面

页面如下，templete/jsp/error/managerError.jsp:
<%@ page contentType="text/html;charset=GBK" language="java"
pageEncoding="GBK"%>
<%@ include file="/template/jsp/include/taglibs.jsp"%>
<%@ page import="java.util.Enumeration,java.util.Iterator"%>
<script>
function showErr(){
var isHidde = document.all.isHidde.value;
//alert(isHidde);
if( isHidde == "true" ){
   document.all.errdiv.style.display='block';
   document.all.isHidde.value= 'false';
   document.all.showbtn.value="隐藏错误信息";
}else{
   document.all.errdiv.style.display='none';
   document.all.isHidde.value= 'true';
   document.all.showbtn.value="显示错误信息";
}
}
</script>
<html>
<head>
   <title>this is failure</title>
</head>
<body onload="showErr()">
   出错啦。。。。。。。。。。。。。。。
   <br />
   <c:set value="${exception}" var="ee" />
   <jsp:useBean id="ee" type="java.lang.Exception" />
   <%=ee.getMessage()%><br />
   <input type="hidden" id="isHidde" value="false" />
   <input type="button" id="showbtn" onclick="showErr();" />
   <br>

   <table id="errdiv" align="center" bgcolor="black">
    <tr>
     <td>
      <font color="green"> <%
ee.printStackTrace(new java.io.PrintWriter(out));
%> </font>
     </td>
    </tr>
   </table>

</body>
</html>

DaoException修改为集成自runtimeException,DaoException.java:
package com.sillycat.plugin.commons.exceptions;

public class DaoException extends RuntimeException {

private static final long serialVersionUID = 1L;

public DaoException() {
   super();
}

public DaoException(String msg) {
   super(msg);
}

public DaoException(Throwable cause) {
   super(cause);
}

public DaoException(String msg, Throwable cause) {
   super(msg, cause);
}

}

ManagerException.java如下：
package com.sillycat.plugin.commons.exceptions;

public class ManagerException extends RuntimeException {

private static final long serialVersionUID = 1L;

// error code
public String errorCode;

public ManagerException() {
   super();
}

public ManagerException(String message) {
   super(message);
}

public ManagerException(String message, Throwable cause) {
   super(message, cause);
}

public ManagerException(Throwable cause) {
   super(cause);

}

public ManagerException(String errorCode, String message) {
   super(message);
   this.errorCode = errorCode;
}

public ManagerException(String errorCode, String message, Throwable cause) {
   super(message, cause);
   this.errorCode = errorCode;
}

public String getErrorCode() {
   return errorCode;
}

public void setErrorCode(String errorCode) {
   this.errorCode = errorCode;
}

}

这样配置和设计后，以后Dao层这样书写，UserDaoIbatisImpl.java:
package com.sillycat.core.dao.ibatis;

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

import com.sillycat.core.dao.UserDao;
import com.sillycat.core.model.User;
import com.sillycat.plugin.commons.base.BaseSqlMapClientDaoSupport;
import com.sillycat.plugin.commons.exceptions.DaoException;

public class UserDaoIbatisImpl extends BaseSqlMapClientDaoSupport implements
   UserDao {

private static final String LOAD_ALL_USERS = "getUser";

public List getAll() {
   List list = null;
   try {
    list = getSqlMapClientTemplate().queryForList(LOAD_ALL_USERS, null);
   } catch (Exception e) {
    throw new DaoException(e);
   }
   return list;
}

public User get(Integer id) {
   return null;
}

public void save(User o) {

}

public void delete(Integer id) {

}

}

在manager层这样调用，不抓dao层的错误
public List getAllUser() {
   if(true){
    throw new ManagerException("0","test");
   }
   List list = userIbatisDao.getAll();
   return list;
}
当DaoException抛出时会走daoError.jsp页面。

如果Controller层没有抓ManagerException.jsp，页面也会统一走向managerError.jsp
如果这样书写
protected void onList(HttpServletRequest request,
    HttpServletResponse response, ModelAndView mav) throws Exception {

   List list = null;
   try {
    list = userManager.getAllUser();
   } catch (ManagerException e) {
    System.out.println("aaaaaaaaaaaaaaaaaaaaaaa");
   }
   mav.addObject("items", list);
}
就不会走managerError.jsp了。需要自己控制提示信息和走向