Struts2学习之十五-声明式的异常处理
看下文前可以先参考：
http://blog.chinaunix.net/u2/84280/showart_1728277.html
package com.test.exception;
public class UsernameException extends Exception
{
private String message;
public UsernameException(String message)
{
super(message);
this.message = message;
}
public String getMessage()
{
return message;
}
public void setMessage(String message)
{
this.message = message;
}
}
声明式的异常处理
1、类
package com.test.exception;
public class PasswordException extends Exception
{
private String message;
public PasswordException(String message)
{
super(message);
this.message = message;
}
public String getMessage()
{
return message;
}
public void setMessage(String message)
{
this.message = message;
}
}
2、action类修
public String execute() throws Exception
{
//username invalid
if(!"hello".equals(this.getUsername()))
{
throw new UsernameException("username invalid");
}
//password invalid
else if(!"world".equals(this.getPassword()))
{
throw new PasswordException("password invalid");
}
else
{
return SUCCESS;
}
}
3、修改struts.xml
全局配置方式：
<global-results> <result name="passwordInvalid">/passwordInvalid.jsp</result> </global-results> <global-exception-mappings> <exception-mapping result="passwordInvalid" exception="com.test.exception.PasswordException"></exception-mapping> </global-exception-mappings> 局部配置方法： <action name="login" class="com.test.action.LoginAction"> <exception-mapping result="usernameInvalid" exception="com.test.exception.UsernameException"></exception-mapping> <result name="success">/result.jsp</result> <result name="usernameInvalid">/usernameInvalid.jsp</result> </action>
4、新增jsp页面
1）usernameInvalid.jsp（举例用EL表达式）
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>
${exception.message }
</body>
</html>
2)passwordInvalid(也可以打印堆栈信息)
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>
<s:property value="exceptionStack"/>
</body>
</html>