创建Struct2的web应用（一）

　　1.上http://struts.apache.org/ 下载Struct2

　　2.解压缩，将lib文件夹内的部分JAR复制到java web应用的WEB-INF/lib目录下。所需JAR：

• commons-fileupload-x.y.z.jar

• commons-io-x.y.z.jar

• commons-lang-x.y.jar

• commons-logging-x.y.z.jar

• commons-logging-api-x.y.jar

• freemarker-x.y.z.jar

• javassist-.xy.z.GA

• ognl-x.y.z.jar

• struts2-core-x.y.z.jar

• xwork-core.x.y.z.jar

　　3.在WEB-INF下的web.xml（如果没有，就自己创建）输入以下代码：

<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="3.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

　　4.创建一个login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!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>stuct2应用</title>
</head>
<body>
<form action="login.action" method="post">
<table>
    <tr>
        <td>用户名:</td>
        <td><input type="text" name="userName"></td>
    </tr>
    <tr>
        <td>密码:</td>
        <td><input type="password" name="password"></td>
    </tr>
    <tr>
        <td colspan="2">
            <input type="submit" value="登陆">
        </td>
    </tr>
</table>
</form>
</body>
</html>

　　5.在java Resources/src目录下创建一个package，叫myWeb（名字随你喜欢），在该package下创建一个类LoginAction.java

package myWeb;

public class LoginAction {
    private String userName;
    private String password;

    public String execute() {
        if(getUserName().equals("kaima") && getPassword().equals("asd"))
            return "success";
        else
            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;
    }
}

　　6.配置Action

　　在WEB-INFO下创建一个名为classes的目录，在该目录下创建一个structs.xml

<?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="myStruct" extends="struts-default">
      <action name="login" class="myWeb.LoginAction">
            <result name="success">/welcome.jsp</result>
            <result name="error">/error.jsp</result>
      </action>
   </package>
</struts>

　　7.完善

　　创建welcome.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>
<h1>welcome</h1>
</body>
</html>

　　创建error.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>
<h2>error</h2>
</body>
</html>

　　到这里，一个structs应用就完成了，如下所示：

　　PS.在构建structs2时，有时会遇到HTTP Status 404问题，这时需要重启服务器。原因是什么得在学习structs2的过程中找了。