Struts2异常机制

昨天，按Struts2的权威指南，做了一个Sturts2异常处理例子

本人是初学者，流程是理解了，不过如果用到具体项目中，还不知道要什么用

相信在这里有很多有经验的前辈，不吝赐教

 

1.先搭建一个Struts框架

2.包结构如下：

package lee;

public class MyException extends Exception
{
    public MyException()
    {
    }
    public MyException(String msg)
    {
        super(msg);
    }
}

package lee;

public class MyException extends Exception
{
	public MyException()
	{
	}
	public MyException(String msg)
	{
		super(msg);
	}
}

 

package lee;

import com.opensymphony.xwork2.Action;


public class LoginAction implements Action
{

    private String username;
    private String password;
    private String tip;


    public void setUsername(String username) {
        this.username = username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setTip(String tip)
    {
        this.tip = tip;
    }

    public String getUsername() {
        return (this.username);
    }

    public String getPassword() {
        return (this.password);
    }
    public String getTip()
    {
        return tip;
    }

    public String execute() throws Exception
    {
         if (getUsername().equalsIgnoreCase("user"))
        {
             throw new MyException("自定义异常");
        }
         if (getUsername().equalsIgnoreCase("sql"))
        {
             throw new java.sql.SQLException("用户名不能为SQL");
        }
         if (getUsername().equals("scott")
                 && getPassword().equals("tiger") )
        {
             setTip("哈哈，服务器提示！");
            return SUCCESS;
        }
        else
        {
            return ERROR;
        }
    }
}

package lee;

import com.opensymphony.xwork2.Action;


public class LoginAction implements Action
{

	private String username;
	private String password;
	private String tip;

	
	public void setUsername(String username) {
		this.username = username; 
	}

	public void setPassword(String password) {
		this.password = password; 
	}

	public void setTip(String tip)
	{
		this.tip = tip;
	}

	public String getUsername() {
		return (this.username); 
	}

	public String getPassword() {
		return (this.password); 
	}
	public String getTip()
	{
		return tip;
	}

    public String execute() throws Exception
	{
		if (getUsername().equalsIgnoreCase("user"))
		{
			throw new MyException("自定义异常");
		}
		if (getUsername().equalsIgnoreCase("sql"))
		{
			throw new java.sql.SQLException("用户名不能为SQL");
		}
        if (getUsername().equals("scott")
                && getPassword().equals("tiger") )
		{
			setTip("哈哈，服务器提示！");
            return SUCCESS;
        }
		else
		{
            return ERROR;
        }
    }
}

 
 

 

 

 

<?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="mypackage" extends="struts-default">
        <!-- 此处定义所有的全局结果 -->
        <global-results>
             <result name="sql">/exception.jsp</result>
             <result name="root">/exception.jsp</result>
        </global-results>
        <!-- 此处定义全局异常映射 -->
        <global-exception-mappings>
            <!-- Action抛出SQLException异常时，转入名为sql的结果 -->
             <exception-mapping result="sql"
                 exception="java.sql.SQLException">
            </exception-mapping>
             <exception-mapping result="root"
                 exception="java.lang.Exception">
            </exception-mapping>
        </global-exception-mappings>
         <action name="login" class="lee.LoginAction">
            <!-- 下面配置一个局部异常映射，当Action抛出lee.MyException时，转入名为my的结果 -->
             <exception-mapping result="my"
                 exception="lee.MyException">
            </exception-mapping>
            <!-- 下面定义结果 -->
             <result name="my">/exception.jsp</result>
             <result name="success">/welcome.jsp</result>
             <result name="error">/error.jsp</result>
        </action>
    </package>
</struts>

<?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="mypackage" extends="struts-default">
		<!-- 此处定义所有的全局结果 -->
		<global-results>
			<result name="sql">/exception.jsp</result>
			<result name="root">/exception.jsp</result>
		</global-results>
		<!-- 此处定义全局异常映射 -->
		<global-exception-mappings>
			<!-- Action抛出SQLException异常时，转入名为sql的结果 -->
			<exception-mapping result="sql"
				exception="java.sql.SQLException">
			</exception-mapping>
			<exception-mapping result="root"
				exception="java.lang.Exception">
			</exception-mapping>
		</global-exception-mappings>
		<action name="login" class="lee.LoginAction">
			<!-- 下面配置一个局部异常映射，当Action抛出lee.MyException时，转入名为my的结果 -->
			<exception-mapping result="my"
				exception="lee.MyException">
			</exception-mapping>
			<!-- 下面定义结果 -->
			<result name="my">/exception.jsp</result>
			<result name="success">/welcome.jsp</result>
			<result name="error">/error.jsp</result>
		</action>
	</package>
</struts>

 

<%@ page language="java" contentType="text/html; charset=GBK"%>
<html>
<head>
<title>登录页面</title>
</head>
<body>
 <form action="login.action" method="post">
     <table align="center">
    <caption><h3>用户登录</h3></caption>
        <tr>
             <td>用户名：<input type="text" name="username"/></td>
        </tr>
        <tr>
             <td>密&nbsp;&nbsp;码：<input type="text" name="password"/></td>
        </tr>
         <tr align="center">
             <td><input type="submit" value="登录"/><input type="reset" value="重填" /></td>
        </tr>
    </table>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=GBK"%>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<form action="login.action" method="post">
    <table align="center">
    <caption><h3>用户登录</h3></caption>
        <tr>
            <td>用户名：<input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密&nbsp;&nbsp;码：<input type="text" name="password"/></td>
        </tr>
        <tr align="center">
            <td><input type="submit" value="登录"/><input type="reset" value="重填" /></td>
        </tr>
    </table>
</form>
</body>
</html>

 

<%@ page language="java" contentType="text/html; charset=GBK"%>
 <%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>成功页面</title>
    </head>
    <body>
        您已经登录!
         <s:property value="tip"/>
    </body>
</html>

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>成功页面</title>
    </head>
    <body>
        您已经登录!
		<s:property value="tip"/>
    </body>
</html>

 

<%@ page language="java" contentType="text/html; charset=GBK"%>
 <%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>异常处理页面</title>
    </head>
    <body>
         <s:property value="exceptionStack"/>
    </body>
</html>

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>异常处理页面</title>
    </head>
    <body>
        <s:property value="exceptionStack"/>
    </body>
</html>

 

<%@ page language="java" contentType="text/html; charset=GBK"%>
<html>
    <head>
        <title>错误页面</title>
    </head>
    <body>
        您不能登录!
    </body>
</html>