今天试着跑个例子，发现出了问题。
Login.JSP
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<script type="text/javascript">
function regist()
{
var tgForm = document.forms[0];
tgForm.action = "LogReg!regist.action";
tgForm.submit();
}
</script>
</head>
<body>
<form action="LogReg!login.action" method="post" name="loginForm">
<table align="center">
<caption>用户登录</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 colspan="2"><input type="submit" value="登录"/><input type="button" value="注册" onclick="regist()" /> </td>
</tr>
</table>
</form>
</body>
</html>
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struts.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1/EN"
"">
<struts>
<package name="struts2" extends="struts-default">
<action name="LogReg" class="com.augur.actions.LoginAction">
<result name="input" >/login.jsp</result>
<result name="success" type="redirect">/welcome.jsp</result>
<result name="error" type="redirect">/error.jsp</result>
</action>
</package>
</struts>
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LoginAciton.java
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package com.augur.actions;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class LoginAction extends ActionSupport
{
private String username;
private String password;
private String tip;
//get,set方法略
public String login() throws Exception
{
ActionContext ctx = ActionContext.getContext();
Integer counter = (Integer)ctx.getApplication().get("counter");
if(counter == null)
{
counter = 1;
}
else
{
counter++;
}
ctx.getApplication().put("counter", counter);
ctx.getSession().put("user", getUsername());
if("xpj".equals(getUsername()) && "xpj".equals(getPassword()))
{
System.out.println("验证通过。。。");
ctx.put("tip", "服务器提示：您已成功登陆！");
return ActionSupport.SUCCESS;
}
else
{
System.out.println("验证失败....");
ctx.put("tip","服务器提示：登陆失败！");
return ActionSupport.ERROR;
}
}
public String regist() throws Exception
{
ActionContext ac = ActionContext.getContext();
ac.put("tip","您已经成功登陆注册界面2");
return SUCCESS;
}
}
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welcome.jsp
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访问次数：${applicationScope.counter}<br>
${sessionScope.user}，您已成功登陆！<br>
Request信息： ${requestScope.tip}
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发现在LoginAction里面设置的tip在welcome.jsp页面上获取到的值为空，看了代码也没发现什么问题。最后仔细看了配置文件，原来result 标签中我定义了type="redirect"，设置了重定向，才会使设置tip的值被置空。只要把不设置type属性即可，也就是采用默认值即可。默认的是dispatcher;
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