首页 > 代码库 > HTTP Status 404 - There is no Action mapped for namespace [/] and action name [product-save] associated with context path [/20161101-struts2-2].
HTTP Status 404 - There is no Action mapped for namespace [/] and action name [product-save] associated with context path [/20161101-struts2-2].
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。
HTTP Status 404 - There is no Action mapped for namespace [/] and action name [product-save] associated with context path [/20161101-struts2-2].