eclipse搭建struts2環境及所遇到的問題
最近幾天一直在搭建struts2框架，本身struts2框架的搭建是非常簡單的，但不知道為什麽最近就是總是報錯，報了一大串的錯
首先就是每次在類的根路徑下創建struts.xml時，就報錯，也不知道為什麽，我還把eclipse換了一遍，結果沒錯了，我也是非常納悶。
報的是:
The errors below were detected when validating the file "struts-2.3.dtd" via the file "struts.xml". In most cases these errors can be detected by validating "struts-2.3.dtd" directly. However it is possible that errors will only occur when struts-2.3.dtd is validated in the context of struts.xml.
然後一直百度，也沒有找到解決辦法，結果今天哇塞，終於解決了，算一下應該有5-6天了。原來這個錯誤是因為引入的約束文件出問題了。
我當時為了配置提示，然後把這個約束就用本地的dtd文件，結果我本地的dtd文件一不小心被改了，如果不配xml提示的話，xml文件默認會去http://struts.apache.org/dtds/struts-2.3.dtd這裏找約束。
而我配了本地的dtd文件的話，就會在本地找我的文件了，結果我的文件被我改成這樣了。
真的謝天謝地，今天終於讓我發現了這個問題，要不然我要一直郁悶下去，還不知道錯哪了。
我當時為了復制xml頭文件的時候，不小心在這裏多復制了一份，把這裏刪了，改成正確的文件的時候，就沒有問題了。再也不報錯了，並且也有提示了。
當然刪了之後，要把struts.xml的內容先剪切一下(假裝刪除)--->保存，不報錯之後，然後再復制上去--->再保存就ok了。然後把這個文件關了，再打開。
配置一下內容
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="p1" namespace="/user" extends="struts-default"> <action name="userLogin" class="com.fzxy.cidp.UserAction" method="userLogin"> <result name="success">/success.jsp</result> </action> </package> </struts>
這裏的package中的屬性: name是必須寫的，這裏name是一個標誌符，可以隨便取一個只要不重復的就行，比如人一出生就要取個名字一樣。那個extends=“struts-default”，就是struts框架寫好的一個package的name，我們繼承它，就可以用裏面的屬性。
這裏的action就是配置了訪問路徑和對應的哪個類來處理這個請求name=“userLogin”
這裏的namespace就是到時候訪問的地址欄中的內容，比如說，我想要在com.fzxy.cidp.UserAction類中處理請求，就得
http://localhost:8080/crm_test/user/userLogin（namespace/actionName）就可以對應上了。
那麽就去建一個以之對應的類
然後就ok了。
這裏需要導入的jar包就是
struts官網上面下載struts-blank裏面的案例，裏面有所需的jar包。
另外還會報一個錯誤
嚴重: Dispatcher initialization failed
Unable to load configuration. - action - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:9:80
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:69)
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.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:285)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:266)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4997)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5699)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1702)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1692)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: Error building results for action userLogin in namespace /user - action - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:9:80
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:389)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:495)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:286)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
... 16 more
Caused by: No result type specified for result named ‘success‘, perhaps the parent package does not specify the result type? - result - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:10:27
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildResults(XmlConfigurationProvider.java:644)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:387)
... 21 more
十月 15, 2018 11:24:47 下午 org.apache.catalina.core.StandardContext filterStart
嚴重: Exception starting filter struts
Unable to load configuration. - action - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:9:80
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:450)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:285)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:266)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4997)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5699)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1702)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1692)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: Unable to load configuration. - action - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:9:80
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:69)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
... 14 more
Caused by: Error building results for action userLogin in namespace /user - action - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:9:80
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:389)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:495)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:286)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
... 16 more
Caused by: No result type specified for result named ‘success‘, perhaps the parent package does not specify the result type? - result - file:/D:/apache-tomcat-7.0.88/webapps/struts_test/WEB-INF/classes/struts.xml:10:27
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildResults(XmlConfigurationProvider.java:644)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:387)
... 21 more
這個錯誤說找不到action與之對應，我開始也找了半天找不到問題所在。後面終於發現了
是這個地方沒有寫，沒有繼承struts-default的包，就沒有struts2默認的過濾器。這樣就會報這個錯誤了。
eclipse搭建struts2環境及所遇到的問題