运行:index.jsp---->input.jsp----->details.jsp,但是在input.jsp到details.jsp的时候报错误。
异常如下:
严重: Could not find action or result
/
There is no Action mapped for namespace [/] and action name [] associated with c
ontext path []. - [unknown location]
at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:1
85)
at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsAct
ionProxyFactory.java:39)
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultA
ctionProxyFactory.java:58)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:534)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOper
ations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilt
er(StrutsPrepareAndExecuteFilter.java:91)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler
.java:1419)
at com.bjhit.eranges.utils.SetCharacterEncodingFilter.doFilter(SetCharacterEnco
dingFilter.java:39)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler
.java:1419)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137
)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java
:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java
:1075)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:
193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:
1009)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135
)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHand
lerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.
java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:1
16)
at org.eclipse.jetty.server.Server.handle(Server.java:368)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpCo
nnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpC
onnection.java:942)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplet
e(AbstractHttpConnection.java:1004)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java
:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.
java:628)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.j
ava:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:
608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:5
43)
at java.lang.Thread.run(Thread.java:662)
代码如下:
web.xml:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> 3 <display-name>20161101-struts2-2</display-name> 4 5 <!-- 配置struts2的Filter --> 6 <filter> 7 <filter-name>struts2</filter-name> 8 <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> 9 </filter> 10 11 <filter-mapping> 12 <filter-name>struts2</filter-name> 13 <url-pattern>/*</url-pattern> 14 </filter-mapping> 15 16 </web-app>
struts.xml:
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC 3 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" 4 "http://struts.apache.org/dtds/struts-2.3.dtd"> 5 6 <struts> 7 <!-- package:包,struts2使用package来组织模块 8 name属性:必须,用于被其他包引用当前包 9 extends:当前包继承哪个包,即可继承父包的所有配置,通常情况下继承struts-default 10 --> 11 12 <package name="helloworld" extends="struts-default"> 13 14 <!-- 配置一个action:一个struts2的请求就是一个action 15 name:对应一个struts2的请求的名字(对应着servletPath,但去除/和扩展名) 16 result:结果 17 --> 18 <action name="product-input"> 19 <result>/WEB-INF/pages/input.jsp</result> 20 </action> 21 22 <action name="product-save" class="com.tt.struts2.helloworld.Product" 23 method="save"> 24 <result name="details">/WEB-INF/pages/details.jsp</result> 25 </action> 26 27 </package> 28 29 30 </struts>
index.jsp:
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <!-- "product-input.action"就是servletPath --> 11 <a href="product-input.action">Product Input</a> 12 </body> 13 </html>
input.jsp:
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <!-- "product-save.action"就是servletPath --> 11 <form action="product-save.action" > 12 13 ProductName:<input type="text" name="productName"/> 14 <br><br> 15 16 ProductDesc:<input type="text" name="productDesc"/> 17 <br><br> 18 19 ProductPrice:<input type="text" name="productPrice"/> 20 <br><br> 21 22 <input type="submit" value="Submit"/> 23 <br><br> 24 </form> 25 26 </body> 27 </html>
details.jsp:
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 ProductId:${productId } 11 <br><br> 12 13 ProductName:${productName } 14 <br><br> 15 16 ProductDesc:${productDesc } 17 <br><br> 18 19 ProductPrice:${productPrice } 20 <br><br> 21 </body> 22 </html>
Product.java:
1 package com.tt.struts2.helloworld; 2 3 public class Product { 4 private Integer productId; 5 6 private String productName ; 7 private String productDesc ; 8 private double productPrice ; 9 10 public String getProductName() { 11 return productName; 12 } 13 public void setProductName(String productName) { 14 this.productName = productName; 15 } 16 public String getProductDesc() { 17 return productDesc; 18 } 19 public void setProductDesc(String productDesc) { 20 this.productDesc = productDesc; 21 } 22 public double getProductPrice() { 23 return productPrice; 24 } 25 public void setProductPrice(double productPrice) { 26 this.productPrice = productPrice; 27 } 28 29 public Integer getProductId() { 30 return productId; 31 } 32 public void setProductId(Integer productId) { 33 this.productId = productId; 34 } 35 36 37 @Override 38 public String toString() { 39 return "Product [productId=" + productId + ", productName=" + productName + ", productDesc=" + productDesc 40 + ", productPrice=" + productPrice + "]"; 41 } 42 43 public String save(){ 44 45 System.out.println("sava: "+this); 46 return "details"; 47 } 48 }
原因分析:
猜测应该是struts.xml的问题,但是第一个product-input的action都可以正常跳转(index.jsp---->input.jsp),为什么第二个product-save(input.jsp----->details.jsp)的action无法正常呢?
二者唯一的区别就是第二个action需要利用反射调用Product类里的save( )方法。但save方法没问题,最后怀疑表单提交上的问题。
仔细看input.jsp页面,发现input.jsp里的form表单提交没有设置method,那么默认为get。
解决办法:将input.jsp里的form添加method="post"问题就解决了,但是不知道为什么会这样,具体原因还有待研究。
在网上查找的这个报错的常见原因如下:
1.struts.xml文件错误。
这种错误又分为以下几种:
1)struts.xml文件名错误。一定要注意拼写问题;
2)struts.xml文件放置路径错误。一定要将此文件放置在src目录下。编译成功后,要确认是否编译到classes目录中;
3)struts.xml文件内容错误:启动页面一定要是自己工程里有的jsp文件。
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
如果你在Eclipse工程的WebContent文件夹下没有这个index.jsp文件,也会报同样的错误。
比如我自己定义了一个login.jsp文件,放在WebContent文件夹下,就写成
<welcome-file>login.jsp</welcome-file>
把login.jsp文件放在WEB-INF下自定义的jsp文件夹下,就写成
<welcome-file>/WEB-INF/jsp/login.jsp</welcome-file>
2.表单提交页面的错误
比如上面我的错误。