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异常处理机制

JSPJavaStrutsApacheHTML 
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1. 定义异常类
1.1 UsernameException.java 
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;
	}
	
}

1.2 PasswordException.java 
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. 定义异常页面
2.1 usernameInvalid.jsp 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
	username invalid.
</body>
</html>

2.2 passwordInvalid.jsp 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
	password invalid.
</body>
</html>

3. LoginAction.java 
       package com.test.action;

import com.opensymphony.xwork2.ActionSupport;
import com.test.exception.PasswordException;
import com.test.exception.UsernameException;

public class LoginAction extends ActionSupport{

	private String username;
	private String password;
	
	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 String execute() throws Exception{
		if(!"hello".equals(username)){
			throw new UsernameException("username invalid");
		}else if(!"world".equals(password)){
			throw new PasswordException("password invalid");
		}else{
			return SUCCESS;
		}
	}
	
	@Override
	public void validate() {
//		if(username!=null&&-1!=username.indexOf("hello")){
//			this.addFieldError("username", "username invalid");
//		}
//		if(password!=null&&password.length()<4){
//			this.addFieldError("password", "password invalid");
//		}
	}
}

4. Struts.xml 
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<package name="struts2" extends="struts-default">
	
		<interceptors>
			<interceptor name="myInterceptor" class="com.test.interceptor.MyInterceptor">
				<param name="hello">world</param>
			</interceptor>
			<interceptor name="myInterceptor2" class="com.test.interceptor.MyInterceptor2">
			</interceptor>
			<interceptor name="myInterceptor3" class="com.test.interceptor.MyInterceptor3">
			</interceptor>
			<interceptor name="authInterceptor" class="com.test.interceptor.AuthInterceptor">
			</interceptor>
			
			<interceptor-stack name="myStack">
				<interceptor-ref name="authInterceptor"></interceptor-ref>
				<interceptor-ref name="myInterceptor"></interceptor-ref>
				<interceptor-ref name="myInterceptor2"></interceptor-ref>
				<interceptor-ref name="defaultStack"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
		
		<global-results>
			<result name="login" type="redirect">/login.jsp</result>
			<result name="usernameInvalid" type="redirect">/usernameInvalid.jsp</result>
			<result name="passwordInvalid" type="redirect">/passwordInvalid.jsp</result>
		</global-results>
		<!-- 
		<default-interceptor-ref name="myStack"></default-interceptor-ref>
		 -->
		<action name="helloworld" class="com.test.action.HelloWorld">
			<result>/helloworld.jsp</result>
		</action>
		注：可以定义成全局异常信息
      <global-exception-mappings>
			<exception-mapping result="usernameInvalid" exception="com.test.exception.UsernameException"></exception-mapping>
			<exception-mapping result="passwordInvalid" exception="com.test.exception.PasswordException"></exception-mapping>
		</global-exception-mappings>
		<action name="login" class="com.test.action.LoginAction">
			<exception-mapping result="usernameInvalid" exception="com.test.exception.UsernameException"></exception-mapping>
			<exception-mapping result="passwordInvalid" exception="com.test.exception.PasswordException"></exception-mapping>
			<result>/result.jsp</result>
			<result name="input">/login2.jsp</result>
		</action>
		
		<action name="converterAction" class="com.test.action.PointAction" method="test" >
			<result name="success">/output.jsp</result>
			<result name="input">/error.jsp</result>
		</action>
		
		<action name="register" class="com.test.action.RegisterAction">
			<result name="success">/success.jsp</result>
			<result name="input">/register.jsp</result>
			<!-- 
			<interceptor-ref name="myInterceptor"></interceptor-ref>
			<interceptor-ref name="myInterceptor2"></interceptor-ref>
			 -->
			 <interceptor-ref name="myStack"></interceptor-ref>
			
			
		</action>
		
	</package>
</struts>
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