struts2异步访问

一、编写异步Action代码

/**
 * Ajax1Action.java
 * action
 * Function： TODO 
 *
 *   version    date      author
 * ──────────────────────────────────
 *   	1.0	 2013-9-21    songjy
 *
 * Copyright (c) 2013, TNT All Rights Reserved.
 */

package action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**
 * ClassName:Ajax1Action
 * 
 * @author songjy
 * @version 1.0
 * @since v1.0
 * @Date 2013-9-21 下午4:24:10
 */

public class Ajax1Action extends ActionSupport {

	private static final long serialVersionUID = 2507057616433321827L;
	private static List<String> names = new ArrayList<String>();
	
	static {
		names.add("song");
		names.add("li");
	}
	
	public String check_name() throws IOException {
		
		//非IoC方式获取HttpServletResponse
		HttpServletResponse response = ServletActionContext.getResponse();
		
		response.setContentType("text/plain; charset=UTF-8");
		
		PrintWriter out = response.getWriter();
		
		out.print(names.contains(name));
		out.flush();
		out.close();
		
		return null;
	}
	
	private String name;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}
/*备注：
 * 1、IoC方式也可获取HttpServletResponse,需要实现org.apache.struts2.interceptor.ServletResponseAware接口，
 * 但不推荐，因实现麻烦且与Servlet API耦合大。
 */

二、在struts.xml中配置Action

<action name="*" class="action.Ajax1Action" method="{1}"/>

三、编写异步jsp页面

<%@ 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>
<%
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath();
%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="js/jquery-1.10.2.js"></script>
<title>AJAX示例</title>
<script type="text/javascript">
	function check_name() {
		
		var username = encodeURIComponent($("#username").val());
		
		$.post("<%=basePath%>/check_name.do", {
			name : username
		}).done(function(data) {
			alert("Data Loaded: " + data);
		});
	}
</script>
</head>
<body>
姓名：<input type="text" name="username" id="username" onblur="javascript:check_name();">
</body>
</html>

四、测试

escape()、encodeURI()、encodeURIComponent()区别详解

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