初识Struts2.5之入的那些坑

た入场券 2022-05-26 10:11 83阅读 0赞

### 1.首先下载[Struts-2.5.16][];   2.解压缩[Struts-2.5.16][]，打开其lib文件夹，将下列基础jar包复制到eclipse新建的工程的web-INF/lib里。 ###

commons-fileupload-1.3.3.jar  
commons-io-2.5.jar  
commons-lang3-3.6.jar  
commons-logging-1.1.3.jar  
freemarker-2.3.23.jar  
javassist-3.20.0-GA.jar  
log4j-api-2.8.2.jar  
ognl-3.1.15.jar  
struts2-core-2.5.13.jar

**3.在web-INF目录下的web.xml文件中，配置Filter，如果没有web.xml，在项目上单击右键，选择”JavaEE Tools”-“Generate Deployment Descriptor Stub”则会自动生成web.xml。在该文件中的配置如下：**

<?xml version="1.0" encoding="UTF-8"?>  
<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">  
<display-name>firstSSH</display-name>  
<welcome-file-list>  
<welcome-file>index.jsp</welcome-file>  
</welcome-file-list>  
<filter>  
<filter-name>struts2</filter-name>  
<filter-class>  
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter  
</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>struts2</filter-name>  
<url-pattern>/\*</url-pattern>  
</filter-mapping>  
<welcome-file-list>  
<welcome-file>index.jsp</welcome-file>  
</welcome-file-list>  
</web-app>

**4.上面这个org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter类很坑，这是Struts2.5版本的一个改变。和之前的Filter不一样了，如果还按之前那样部署，只会出现java.lang.ClassNotFoundException。大家一定要记住。**

**5.创建index.jsp**

<%@ page language="java" contentType="text/html; charset=UTF-8"  
pageEncoding="UTF-8"%>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<title>Insert title here</title>  
</head>  
<body>  
<form action="logins.action" method="post">  
name:<input type="text" name="userName">  
<br>  
passWord:<input type="passWord" name="passWord">  
<input type="submit" value="提交">  
</form>  
</body>

</html>

**6.创建index2.jsp**

</html>

**7.在工程的src目录下创建包名com.hanpeng.action,然后在其下创建类LoginAction.java**

package com.hanpeng.action;  
  
  
public class LoginAction \{  
private String userName;  
private String passWord;  
  
public LoginAction() \{  
// TODO Auto-generated constructor stub  
\}  
  
//定义Struts默认的方法  
public String execute()\{  
//返回字符串类型给struts.xml文件接收  
return "success";  
\}  
//定义错误时应调用方法  
public String error()\{  
//返回字符串类型给struts.xml文件接收  
return "error";  
\}  
public String getUserName() \{  
return userName;  
\}  
public void setUserName(String userName) \{  
this.userName = userName;  
\}  
public String getPassWord() \{  
return passWord;  
\}  
public void setPassWord(String passWord) \{  
this.passWord = passWord;  
\}  
\}

**8.在工程的src目录下创建struts.xml**

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE struts PUBLIC  
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"  
"http://struts.apache.org/dtds/struts-2.5.dtd">  
<struts>  
<constant name="struts.enable.DynamicMethodInvocation" value="true" />  
<package name="rest-showcase" extends="struts-default">  
<global-allowed-methods>index,show,create,update,destroy,deleteConfirm,edit,editNew</global-allowed-methods>  
<action name="logins" class="com.hanpeng.action.LoginAction">  
<result name="success">/index2.jsp</result>  
<result name="error">/error.jsp</result>  
</action>  
</package>

</struts>

**9.好了现在运行项目，这样Demo就完成了。**

[Struts-2.5.16]: http://mirror.bit.edu.cn/apache/struts/2.5.16/struts-2.5.16-all.zip