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Struts2第一个程序

2013-09-02 00:05 411 查看
Struts2的优点:

在体系结构方面更优秀:

类更少, 更高效:  在 Struts2 中无需使用 “ActionForm” 来封装请求参数. 
扩展更容易:  Struts2 通过拦截器完成了框架的大部分工作. 在 Struts2 中插入一个拦截器对象相当简便易行. 

更容易测试:即使不使用浏览器也可以对基于 Struts2 的应用进行测试



搭建 Struts2 的环境:









Web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd"> <display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<!-- 配置 struts2 的  StrutsPrepareAndExecuteFilter, 拦截所有请求-->
<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>


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>
<!-- 要使用struts2的功能,需要继承 struts-default包-->
<package name="helloStruts2" extends="struts-default">
<!--
action:代表一个请求
name:和servletPath对应,即请求的action名称
-->
<action name="Input_Product">
<result>/WEB-INF/Product/product_input.jsp</result>
</action>

<action name="Product_save" class="com.xxc.test1.ProductAction">
<result name="success">/WEB-INF/Product/product_Details.jsp</result>
</action>
</package>
</struts>

ProductAction

public class ProductAction {
private String productName;
private int productPrice;
//struts2默认会执行这个方法
public String execute(){

return "success";
}

public String getProductName() {
return productName;
}

public void setProductName(String productName) {
this.productName = productName;
}

public int getProductPrice() {
return productPrice;
}

public void setProductPrice(int productPrice) {
this.productPrice = productPrice;
}
}


product_input.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 'index.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<form action="Product_save.action">
<table>
<tr>
<td>ProductName: </td>
<td><input type="text" name="productName"/></td>
</tr>
<tr>
<td>ProductPrice: </td>
<td><input type="text" name="productPrice"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Submit"/>
</td>
</tr>
</table>
</form>
</body>
</html>

product_Details.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>

<h4>Product Details</h4>

productName: ${requestScope.productName }<br><br>
productPrice: ${requestScope.productPrice }

<br><br>
<!-- 发现这个request已经是被struts2包装过的了 -->
request: <%= request %>

</body>
</html>


运行结果:



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