Struts2异常机制 -

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Struts2异常机制

Struts SQL JSP HTML Apache

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：

Myexception代码

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);
	}
}

Loginaction代码

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;
        }
    }
}

Struts.xml代码

<?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">
<global-results>
<result name="sql">/exception.jsp</result>
<result name="root">/exception.jsp</result>
</global-results>
<global-exception-mappings>
<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">
<exception-mapping result="my"
exception="lee.MyException">
</exception-mapping>
<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  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>

Welcome.jsp代码

<%@ 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>

Exception.jsp代码

<%@ 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>

Error代码