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在eclipse中编译struts2的一个简单程序

发布时间： 2012-12-18 12:43:41 作者： rapoo

在eclipse中编译struts2的一个简单程序，提示“HTTP Status 404 ”的错误
ShowWords.java

package action;

import com.opensymphony.xwork2.ActionSupport;



public class ShowWords extends ActionSupport {

private String name;
private String words;


public String execute()
{

if("".equals(name))
{
return INPUT;

}
else
{

words="welcom "+name;
return SUCCESS;
}
}
}


inputWords.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>简单的struts 2 应用</title></head>
  <body>

<center>
<form name="myForm" action="showWords.action" method="post">
请输入姓名：<input name="name" type="text" /><br/>
<input type="submit" name="mySubmit" value="提交"/>
</form>
</center>
  </body>
</html>

showWords.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>简单的struts 2 应用</title></head>
  <body>

${words}
  </body>
</html>


web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>ch2struts2</display-name>
<filter>
    <filter-name>
        struts2
    </filter-name>
    <filter-class>
        org.apache.struts2.dispatcher.FilterDispatcher
    </filter-class>
</filter>
<filter-mapping>
    <filter-name>
        struts2
    </filter-name>
    <url-pattern>
        /*
    </url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>inputWords.jsp</welcome-file>
</welcome-file-list>
</web-app>


例子是安装书上的写的，但是，总是提示错误，请大牛看看什么原因，本人菜鸟。。。
struts.xml
<?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="default" extends="struts-default">
   <action name="showWords" class="com.ShowWords">
     <result name="success">/showWords.jsp</result>
     <result name="error">/inputWords.jsp</result> 
 
   </action>
 </package>  
</struts>


其中，xml与jsp放置位置如下：

在eclipse里运行结果：

[最优解释]
<action?name="showWords"?class="com.ShowWords">
?????<result?name="success">/showWords.jsp</result>
?????<result?name="error">/inputWords.jsp</result>
???</action>

404是找不到路径，你代码调试下看，代码有没进入后台执行了，有的话，那就是这两个路径不对了。
改为：
???<action?name="showWords"?class="com.ShowWords">
?????<result?name="success">showWords.jsp</result>
?????<result?name="error">inputWords.jsp</result>
???</action>
或
???<action?name="showWords"?class="com.ShowWords">
?????<result?name="success">./showWords.jsp</result>
?????<result?name="error">./inputWords.jsp</result>
???</action>

再试下看


[其他解释]
还有,
<form name="myForm" action="showWords.action" method="post">
这里action名称是showWords.action


<action name="showWords" class="com.ShowWords">
这里action名称是showWords

也不一样啊.

你确定是照书上敲的代码?
[其他解释]
将：
?<action?name="showWords"?class="com.ShowWords">
改为：?<action?name="showWordsShow"?class="com.ShowWords"　method="show">

将：?public?String?execute()
改为：?public?String?show()

将：<form name="myForm" action="showWords.action" method="post">
改为：<form name="myForm" action="showWordsShow.action" method="post">
[其他解释]
引用:
将：
<action name="showWords" class="com.ShowWords">
改为： <action name="showWordsShow" class="com.ShowWords"　method="show">

将： public String execute()
改为： public String show()

将：<f……


我试了，还是一样的问题啊，到底什么原因啊，搞不清楚。。。
[其他解释]
引用:
<action name="showWords" class="com.ShowWords">
<result name="success">/showWords.jsp</result>
<result name="error">/inputWords.jsp</result>
</action>

404是找不到路径，你代码调……


调试了，没有进入后台的show（）函数，因为inputWords.jsp都没访问到，无法submit请求到后台，所以不会进入后台的断点吧，我感觉是这样的。
难道是struts.xml在工程里放置的位置不对？但是好多例子是放置在src目录下的。。。
[其他解释]
<action name="showWords" class="com.ShowWords">

ShowWords明显在包action下啊,com.ShowWords哪来的?

改成action.ShowWords,之后再试
[其他解释]
我想请问下你的工程启动报错没有，要是工程没有启动起来，这个404那是必然的
[其他解释]
引用:
我想请问下你的工程启动报错没有，要是工程没有启动起来，这个404那是必然的


工程果真没起来，报错如下，麻烦帮我看看什么原因呢？

2012-11-15 10:56:52 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre6\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jdk1.6.0_16/bin/../jre/bin/client;C:/Program Files/Java/jdk1.6.0_16/bin/../jre/bin;C:/Program Files/Java/jdk1.6.0_16/bin/../jre/lib/i386;C:\Program Files\Common Files\NetSarang;C:\Program Files\Java\jdk1.6.0_16\bin;E:\install\works\androidInstall\android-sdk-windows\android-sdk-windows\platform-tools;D:\Program Files\Java\jre6\bin;D:\Program Files\Java\jdk1.6.0_16\bin;C:\Program Files\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;D:\Program Files;D:\new\eclipse-jee-juno-win32\eclipse;


2012-11-15 10:56:52 org.apache.coyote.http11.Http11BaseProtocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2012-11-15 10:56:52 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 343 ms
2012-11-15 10:56:52 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2012-11-15 10:56:52 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.5.34
2012-11-15 10:56:52 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2012-11-15 10:56:52 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Dispatcher initialization failed
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:301)
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:438)
at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207)
at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51)
at com.opensymphony.xwork2.inject.ContainerBuilder$3.create(ContainerBuilder.java:93)
at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:487)
at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:484)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:580)
at com.opensymphony.xwork2.inject.ContainerBuilder.create(ContainerBuilder.java:484)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.createBootstrapContainer(DefaultConfiguration.java:288)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:205)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:193)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)


Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:299)
... 32 more
Caused by: java.lang.ExceptionInInitializerError
at com.opensymphony.xwork2.ognl.OgnlValueStackFactory.setContainer(OgnlValueStackFactory.java:85)
... 37 more
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:168)
... 38 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1438)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:165)
... 38 more
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
java.lang.reflect.InvocationTargetException - Class: com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector
File: ContainerImpl.java
Method: inject
未完，见下条继续
[其他解释]
接上条
Line: 301 - com/opensymphony/xwork2/inject/ContainerImpl.java:301:-1
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:450)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:193)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:301)


at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:438)
at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207)
at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51)
at com.opensymphony.xwork2.inject.ContainerBuilder$3.create(ContainerBuilder.java:93)
at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:487)
at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:484)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:580)
at com.opensymphony.xwork2.inject.ContainerBuilder.create(ContainerBuilder.java:484)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.createBootstrapContainer(DefaultConfiguration.java:288)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:205)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
... 19 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:299)
... 32 more
Caused by: java.lang.ExceptionInInitializerError
at com.opensymphony.xwork2.ognl.OgnlValueStackFactory.setContainer(OgnlValueStackFactory.java:85)
... 37 more
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:168)
... 38 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1438)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:165)
... 38 more
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext start
严重: Context [/ch2struts2] startup failed due to previous errors
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
java.lang.ClassNotFoundException: org.apache.struts.dispatcher.FilterDispatcher
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1438)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:207)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666)


at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2012-11-15 10:56:52 org.apache.catalina.core.StandardContext start
严重: Context [/Strut2Travel] startup failed due to previous errors
2012-11-15 10:56:52 org.apache.coyote.http11.Http11BaseProtocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2012-11-15 10:56:52 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2012-11-15 10:56:52 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/16 config=null
2012-11-15 10:56:53 org.apache.catalina.storeconfig.StoreLoader load
信息: Find registry server-registry.xml at classpath resource
2012-11-15 10:56:53 org.apache.catalina.startup.Catalina start
信息: Server startup in 563 ms
[其他解释]
解决了，少了一个包，导致工程启动不起来，struts2.3.4.1需要的包如下：

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