利用Struts2技术(Action对象)处理表单

1.创建一个JavaWeb项目,编写一个Action对象,其名为GreetingAction,继承ActionSuppport类

具体代码如下:

import com.opensymphony.xwork2.ActionSupport;

public class GreetingAction extends ActionSupport {
	private static final long serialVersionUID = 1L;
	// 用户名
	private String username;
	// 处理请求
	@Override
	public String execute() throws Exception{
		// 判断用户名是否有效
	if(username == null || "".equals(username)){
			// 返回到错误页面
			return ERROR;
		}else{
			// 返回到成功页面
			return SUCCESS;
		}
	}
	// username属性的getter方法
	public String getUsername() {
		return username;
	}
	// username属性的setter方法
	public void setUsername(String username) {
		this.username = username;
	}
}

2.在web-inf目录下创建web.xml文件,为Struts2配置过滤器

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	<display-name>8.2</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list><!-- Struts2过滤器 -->
	<filter>
		<!-- 过滤器名称 -->
		<filter-name>struts2</filter-name>
		<!-- 过滤器类 -->
		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<!-- Struts2过滤器映射 -->
	<filter-mapping>
		<!-- 过滤器名称 -->
		<filter-name>struts2</filter-name>
		<!-- 过滤器映射 -->
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

3.在src目录下创建struts.xml文件,并写入以下代码

<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
	"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<!-- 声明包 -->
    <package name="myPackage" extends="struts-default">
    	<!-- 定义action -->
    	<action name="greeting" class="com.lyq.action.GreetingAction">
    		<!-- 定义成功的映射页面 -->
    		<result name="success">success.jsp</result>
    		<!-- 定义失败的映射页面 -->
    		<result name="error">error.jsp</result>
    	</action>
    </package>
</struts>

4.创建一个jsp页面,在该页面中编写一个简单的表单

<%@ 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>主页</title>
<style type="text/css">
	*{font-size: 12px;}
</style>
</head>
<body>
  <form action="greeting.action" method="post">
  	请输入你的姓名:<input type="text" name="username">
  	<input type="submit" value="提交">
  </form>
</body>
</html>

5.创建Greeting类处理成功所返回的页面和处理失败所返回的页面:success.jsp、error.jsp

success.jps:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" 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>欢迎</title>
<style type="text/css">
	*{font-size: 12px;}
</style>
</head>
<body>
	<font color="red">
		<s:property value="username" />
	</font>
	 ,您好!
	<br>
	欢迎使用来到本站。
</body>
</html>

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>错误</title>
</head>
<body>
	<font color="red"> 错误:您没有输入姓名!</font>
</body>
</html>

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转载自blog.csdn.net/qq_52477159/article/details/124566622
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