struts2第三篇：跨入struts2世界第一步

2012-11-18

struts2第三篇：踏入struts2世界第一步/*大家如果喜欢学习struts2可以随时来看看，欢迎大家的到来！由于我的

struts2第三篇：踏入struts2世界第一步

大家如果喜欢学习struts2可以随时来看看，欢迎大家的到来！

由于我的时间有限，很多地方都不能详细的讲解，因此需要大家的理解和支持，其实学这个，我也只能做一下指导，如果大家有不懂的可以留言询问。大家互相学习学习！

我会在每一天出一篇struts2讲解。如果有事耽搁了，请大家原谅！

大家注意代码中标有红记的地方，是学习的重点。

第一步(view编写):(login.jsp)

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>


<%
?String path = request.getContextPath();
?String basePath = request.getScheme() + "://"
???+ request.getServerName() + ":" + request.getServerPort()
???+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
?<head>
??<base href="<%=basePath%>">

??<title>My JSP 'login.jsp' starting page</title>

??<meta http-equiv="pragma" content="no-cache">
??<meta http-equiv="cache-control" content="no-cache">
??<meta http-equiv="expires" content="0">
??<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
??<meta http-equiv="description" content="This is my page">
??

?</head>

?<body>
??<s:form action="login">

<!--注意：login不是与action直接对应，而是通过struts.xml映射文件中的

name=“login”对应-->
???<s:textfield name="username" label="用户名"></s:textfield>
???<s:password name="password" label="密码"></s:password>
???<s:submit label="提交"></s:submit>

??</s:form>

利用标签创建提交表单，相信大家看得懂。

?</body>
</html>

(result.jsp)

?<%@ page language="java" import="java.util.*" 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">
<html>
?<head>
??<base href="<%=basePath%>">

??<title>My JSP 'result.jsp' starting page</title>

?</head>

?<body>
??${requestScope.username}
?? 
??${requestScope.password }
?</body>

</html>

第二步(action)

?package com.newstar.struts2.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

?/**
? *
? */
?private static final long serialVersionUID = 9038781564022152594L;
?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;
?}
?public String execute(){
??if("hello".equals(username.trim())&&"world".equals(password.trim())){
???return "success";?
??}else{
???this.addFieldError("username","username or password is not right!");
???return "failer";
??}
/*

execute()只做调控作用，业务逻辑不应该在这里完成，这里因为比较简单，我才写在了这里。业务逻辑交给业务层，我以MVC模式举例。

*/
?}
?@Override
?public void validate() {
??if(username==null||"".equals(getUsername().trim())){
???this.addFieldError("username", "username is null");
??}
??if(password==null||"".equals(getPassword().trim())){
???this.addFieldError("password", "password is null");
??}
?}

这个方法是做表单验证的，是struts2中很重要的一部分，后面我会作具体介绍。相信这点代码还是难不倒大家的。

*/
}

第三步(web.xml)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
?http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

?<filter>
??<filter-name>struts2</filter-name>
??<filter-class>
???org.apache.struts2.dispatcher.FilterDispatcher
??</filter-class>
?</filter>
?<filter-mapping>
??<filter-name>struts2</filter-name>
??<url-pattern>/*</url-pattern>
?</filter-mapping>

?<welcome-file-list>
??<welcome-file>login.jsp</welcome-file>
?</welcome-file-list>
</web-app>

最后一步(struts.xml)

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
??? "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
??? "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
?? <package name="struts" extends="struts-default">
????? <action name="login" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%>
 <% ?String path = request.getContextPath(); ?String basePath = request.getScheme() + "://" ???+ request.getServerName() + ":" + request.getServerPort() ???+ path + "/"; %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> ?<head> ??<base href="<%=basePath%>">
??<title>My JSP 'login.jsp' starting page</title>
??<meta http-equiv="pragma" content="no-cache"> ??<meta http-equiv="cache-control" content="no-cache"> ??<meta http-equiv="expires" content="0"> ??<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> ??<meta http-equiv="description" content="This is my page"> ??
?</head>
?<body> ??<s:form action="login">
 ???<s:textfield name="username" label="用户名"></s:textfield> ???<s:password name="password" label="密码"></s:password> ???<s:submit label="提交"></s:submit>
 ??</s:form>
/*
利用标签创建提交表单，相信大家看得懂。
*/
?</body> </html>
/*
?
*/
(result.jsp)
?<%@ page language="java" import="java.util.*" 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"> <html> ?<head> ??<base href="<%=basePath%>">
??<title>My JSP 'result.jsp' starting page</title>
??<meta http-equiv="pragma" content="no-cache"> ??<meta http-equiv="cache-control" content="no-cache"> ??<meta http-equiv="expires" content="0"> ??<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> ??<meta http-equiv="description" content="This is my page"> ??
?</head>
?<body> ??${requestScope.username} ?? ??${requestScope.password } ?</body>
 </html>
第二步(action)
?package com.newstar.struts2.action;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
?/** ? * ? */ ?private static final long serialVersionUID = 9038781564022152594L; ?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; ?} ?public String execute(){ ??if("hello".equals(username.trim())&&"world".equals(password.trim())){ ???return "success";? ??}else{ ???this.addFieldError("username","username or password is not right!"); ???return "failer"; ??} /*
execute()只做调控作用，业务逻辑不应该在这里完成，这里因为比较简单，我才写在了这里。业务逻辑交给业务层，我以MVC模式举例。
*/ ?} ?@Override ?public void validate() { ??if(username==null||"".equals(getUsername().trim())){ ???this.addFieldError("username", "username is null"); ??} ??if(password==null||"".equals(getPassword().trim())){ ???this.addFieldError("password", "password is null"); ??} ?}
/*
这个方法是做表单验证的，是struts2中很重要的一部分，后面我会作具体介绍。相信这点代码还是难不倒大家的。
*/ }
第三步(web.xml)
 <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="<a href='http://java.sun.com/xml/ns/javaee'>http://java.sun.com/xml/ns/javaee</a>" ?xmlns:xsi="<a href='http://www.w3.org/2001/XMLSchema-instance'>http://www.w3.org/2001/XMLSchema-instance</a>" ?xsi:schemaLocation="<a href='http://java.sun.com/xml/ns/javaee'>http://java.sun.com/xml/ns/javaee</a> ?<a href='http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd'>http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd</a>">
?<filter> ??<filter-name>struts2</filter-name> ??<filter-class> ???org.apache.struts2.dispatcher.FilterDispatcher ??</filter-class> ?</filter> ?<filter-mapping> ??<filter-name>struts2</filter-name> ??<url-pattern>/*</url-pattern> ?</filter-mapping>
 ?<welcome-file-list> ??<welcome-file>login.jsp</welcome-file> ?</welcome-file-list> </web-app>
最后一步(struts.xml)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC ??? "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" ??? "<a href='http://struts.apache.org/dtds/struts-2.0.dtd'>http://struts.apache.org/dtds/struts-2.0.dtd</a>"> <struts> ?? <package name="struts" extends="struts-default"> ????? <action name="login" uri="/struts-tags"%> 这个提示找不到标签什么的...

注意两点：
1.标签地址。
2。标签库。 12 楼 lijiang 2009-02-11 struts2入门的文章

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struts2第三篇：跨入struts2世界第一步