Struts2 初体验

ihuning

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版本说明：
jdk-version:      jdk-7u21-windows-i586
struts-version:   struts-2.3.16.3-all
eclipse-version: eclipse-jee-luna-R-win32
tomcat-version:   apache-tomcat-7.0.55-windows-x86

开发步骤：
1. 下载Struts2： http://struts.apache.org/；
2. 下载Tomcat：http://tomcat.apache.org/；
3. 下载Eclipse：www.eclipse.org；
4. 打开Eclipse新建工程（Dynamic Web project）；
5. 在WEB-INF/lib下添加Struts2包(commons-fileupload-1.3.1.jar,commons-io-2.2.jar,commons-lang3-3.1.jar,freemarker-2.3.19.jar,
     javassist-3.11.0.GA.jar,ognl-3.0.6.jar,struts2-core-2.3.16.3.jar,xwork-core-2.3.16.3.jar);
6. 在WEB-INF/lib下添加servlet-api.jar；
7. 在WEB-INF下添加文件web.xml（此文件在新建工程时自动生成，或从Struts样例工程中拷贝）;

 <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Struts2 Demo</display-name>
   <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>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

8. 在WebContent目录下添加jsp页面；

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="p" uri="/struts-tags"%>
<!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><p:text name="Struts2 Demo"></p:text></title>
</head>
<body>
	<p:form action="login">
		<p:textfield name="username" key="user" />
		<p:textfield name="password" key="pass" />
		<p:submit key="login" />
	</p:form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="p" uri="/struts-tags"%>
<!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><p:text name="Login Error"></p:text></title>
</head>
<body>
	<h1>Login Error</h1>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="p" uri="/struts-tags"%>
<!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><p:text name="Login Success"></p:text></title>
</head>
<body>
	<h1>Login Success</h1>
</body>
</html>

9. 添加Struts配置文件src/struts.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>
	<constant name="struts.custom.i18n.resources" value="mess" />
	<constant name="struts.i18n.encoding" value="UTF-8" />

	<package name="com.ihuning.struts2.demo.login" extends="struts-default">
		<action name="login" class="com.ihuning.struts2.demo.login.LoginAction">
			<result name="input">/index.jsp</result>
			<result name="error">/WebPage/login_error.jsp</result>
			<result name="success">/WebPage/login_success.jsp</result>
		</action>
	</package>
</struts>

10. 添加国际化支持文件src/mess.propertiemess_zh_CN.properties,src/mess_zh_CN.properties;

mess_zh_CN.properties

loginPage=登录页面
errorPage=失败页面
succPage=成功页面
failTip=登录失败
succTip=登录成功
user=密码
pass=用户名
login=登录

mess_zh_CN.properties

loginPage=\u767B\u5F55\u754C\u9762
errorPage=\u5931\u8D25\u9875\u9762
succPage=\u6210\u529F\u9875\u9762
failTip=\u767B\u5F55\u5931\u8D25
succTip=\u767B\u5F55\u6210\u529F
user=\u7528\u6237\u540D
pass=\u5BC6\u7801
login=\u767B\u5F55

11. 添加Action类以及相关处理类com.ihuning.struts2.demo.login/LoginAction.java,com.ihuning.struts2.demo.login/UserManager.java

package com.ihuning.struts2.demo.login;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

	private static final long serialVersionUID = 1441274772944059243L;

	private String username;
	private String password;

	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;
	}

	@Override
	public String execute() throws Exception {

		int resultCode = UserManager.getInstance().verifyUser(getUsername(),
				getPassword());
		if (resultCode == 0) {
			return SUCCESS;
		} else {
			return ERROR;
		}
	}
}

package com.ihuning.struts2.demo.login;

public class UserManager {

	private static UserManager instance = new UserManager();

	private UserManager() {
	}

	public static UserManager getInstance() {
		return instance;
	}

	public int verifyUser(String username, String password) {
		if ("ihuning".equals(username) && "ihuning".equals(password)) {
			return 0;
		} else {
			return -1;
		}
	}
}

12. 文件清单视图；