在UserAction类中引发异常,但是不处理
package com.djoker.struts2; import java.util.Date; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.Action; public class UserAction { private String username; private String password; private Date createDate; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Date getCreateDate() { return createDate; } public void setCreateDate(Date createDate) { this.createDate = createDate; } public String addUser() throws Exception { if("admin".equals(username)){ throw new UserNotFoundException("账号没有找到"); } ServletActionContext.getRequest().setAttribute("username", username); ServletActionContext.getRequest().setAttribute("password", password); ServletActionContext.getRequest().setAttribute("createDate", createDate); return Action.SUCCESS; } }
UserNotFoundException.java类
package com.djoker.struts2; public class UserNotFoundException extends RuntimeException { public UserNotFoundException() { super(); // TODO Auto-generated constructor stub } public UserNotFoundException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public UserNotFoundException(String message) { super(message); // TODO Auto-generated constructor stub } public UserNotFoundException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
配置文件中可以配置全局异常和局部异常
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd"> <struts> <package name="user" extends="struts-default" namespace="/user"> <global-exception-mappings> <exception-mapping result="error" exception="com.djoker.struts2.UserNotFoundException"></exception-mapping> </global-exception-mappings> <action name="*User" class="com.djoker.struts2.UserAction" method="{1}User"> <exception-mapping result="error" exception="com.djoker.struts2.UserNotFoundException"></exception-mapping> <result>/success.jsp</result> <result name="error">/error.jsp</result> </action> </package> </struts>
错误后的跳转页面error.jsp,可以使用el表达式取得异常信息
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <body> <h1>登录失败</h1> <!-- 获取异常信息 --> ${exception.message }<br> <!-- 获取异常堆栈信息 --> ${exceptionStack }<br> </body> </html>