2011/04/05 关于struts2的错误
我用struts2和hibernate3、dwr来做毕业设计，原以为周多一周局可以搞定，但有两个错误却让我检查了3天。
1、看代码
public class Login extends ActionSupport {
Login(){
System.out.println("xxxxxxxxxxxx");
}
public String pointLogin(){
HttpServletRequest request=ServletActionContext.getRequest();
String userid = request.getParameter("userid");
String password = request.getParameter("password");
System.out.println(userid+": " + password);
return "success";
}
}
这是我用于测试登录页是否能正确跳转的代码，你发现那里错了吗？
一般情况下，他是没错的，但是在struts2框架下，该项目根本无法启动！为什么？因为构造方法是默认权限(default)，且看default权限的描述：默认权限（default）类，数据成员，构造方法，方法成员，都能够使用默认权限，即不写任何关键字。默认权限即同包权限，同包权限的元素只能在定义它们的类中，以及同包的类中被调用。 不仅仅default不可以，protected也不可以。所以，如果你一定要写构造方法，那么请加上public。
2、先看看struts2.xml配置文件:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.i18n.encoding" value="UTF-8"></constant>
<constant name="struts.locale" value="zh_CN"></constant>
<package name="count" namespace="/count" extends="struts-default">
<interceptors>
<interceptor name="userInterceptor" class="com.common.UserInterceptor"></interceptor>
<interceptor-stack name="myInstance">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="userInterceptor"></interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="myInstance"></default-interceptor-ref>
<global-results>
<result name="error">login.jsp</result>
</global-results>
<action name="login" class="com.action.Login" method="pointLogin">
<result name="success">WEB-INF/jsp/content.jsp</result>
<result name="error">login.jsp</result>
</action>
</package>
</struts>
这段代码有错吗？没有！我也是这么觉得的。但是出现一个问题：在我点击“登录”按钮后，页面跳转了，Login()构造方法也也执行了，但是却是空白页面，查看源代码也是神马也木有！我找哇找，重写了4个project，最后我把struts.xml中关于拦截器的代码注释了，然后就好了……啊啊啊……啊啊……啊……………………我表示，我的拦截器里面神马也没写，我就是先配置好，放在那儿也不行哇！！！他就那样给我全过滤了！血的教训……………………
2023年4月16日 16:14
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