为什么重定向出错呢？

Question

说明：本人希望用户访问/Login.do的时候，自动转到某个网站的页面，比如www.baidu.com。Struts 1.2配置文件：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"><struts-config>
<data-sources />
<form-beans />
<global-exceptions />
<global-forwards>
<forward name="login" path="/Login.do" />
</global-forwards>
<action-mappings>
<action path="/Login" type="com.httpunit.base.LoginAction" />
</action-mappings>
<message-resources parameter="com.httpunit.base.ApplicationResources" />
</struts-config>
源代码：import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;public class LoginAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { return new ActionForward("http://www.baidu.com");
}
}
异常：2010-12-3 15:30:47 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.IllegalArgumentException: Path http://www.baidu.com does not start with a "/" character
at org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:368)
at org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:196)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)
2010-12-3 15:31:03 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.IllegalArgumentException: Path http://www.baidu.com does not start with a "/" character
at org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:368)
at org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:196)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)

Answer 1

http://www.baidu.com does not start with a "/" character

Answer 2

请问大家是如何在Struts中实现网址跳转的呢？比如从本地跳转到某个网址。

Answer 3

return new ActionForward("/http://www.baidu.com");改成这样

Answer 4

出错啦：HTTP Status 404 - /HttpUnitBase/http://www.baidu.com--------------------------------------------------------------------------------type Status reportmessage /HttpUnitBase/http://www.baidu.comdescription The requested resource (/HttpUnitBase/http://www.baidu.com) is not available.
--------------------------------------------------------------------------------Apache Tomcat/6.0.13

Answer 5

出错啦：HTTP Status 404 - /HttpUnitBase/http://www.baidu.com--------------------------------------------------------------------------------type Status reportmessage /HttpUnitBase/http://www.baidu.comdescription The requested resource (/HttpUnitBase/http://www.baidu.com) is not available.
--------------------------------------------------------------------------------Apache Tomcat/6.0.13

Answer 6

用Response.sendRedirect(""); 试试

Answer 7

目前我了解的是Struts的Action里面不能重定向到外部网址，如果需要重定向，则需要在Servlet中实现！通过Response.sendRedirect("http://www.baidu.com");即可实现重定向。

Answer 8

forward是同一web应用内部移动，在服务端完成转向sendRedirect是重新跳转，由客户端执行跳转。所以forward是不能完成向别的应用跳转，路径必须是web应用的context + urisendRedirect可以转向任何应用，路径可以是绝对路径也可以是相对路径