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※Ajax※

Ajax初學者入門---登陸(ログイン)

作者:ChinaJavaWorld_CC 日期:2007-04-17 13:59:02

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今天閑的沒事，看了看ajax，寫個初學者適用的登陸例子，寫得比較爛，希望大家多多指教。
想想，大部分我們初學時不是HelloWorld，就是Login，俺剛開始學Ajax時也想找個Login例子，結果找了半天也沒找到，唉~~~只能自己痛苦的啃書，哈哈......
login.jsp頁面如下： 
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<%@ page language="java" contentType="text/html; charset=GB2312"
	pageEncoding="GB2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
		<title>login</title>
		
		<script type="text/javascript">
			var xmlHttp = false;
			
			function createRequest()
			{
				try
				{
					xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
				}
				catch(e)
				{
					try
					{
						xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
					}
					catch(e2)
					{
						xmlHttp = false;
					}
				}
				
				if(!xmlHttp && typeof XMLHttpRequest != 'undefined')
				{
					xmlHttp = new XMLHttpRequest();
				}
				
				if(!xmlHttp)
				{
					alert("Error initialing XMLHttpRequest!");
				}
			}
			
			function callServerGET()
			{
				createRequest();
				
				var username = document.getElementById("username").value;
				var password = document.getElementById("password").value;
				
				if((username == null) || (username == ""))
				{
					return;
				}
				
				if((password == null) || (password == ""))
				{
					return;
				}
				
				var url = "test?username=" + escape(username) + "&password=" + escape(password);
				
				xmlHttp.open("GET", url, true);
				xmlHttp.onreadystatechange = updatePageGET;
				xmlHttp.send(null);
			}
			
			function updatePageGET()
			{
				if(xmlHttp.readyState == 4)
				{
					if(xmlHttp.status == 200)
					{
						var response = xmlHttp.responseText;
						document.getElementById("result").innerHTML = response;
					}
					else if(xmlHttp.status == 403)
					{
						alert("Access denied.");
					}
					else if(xmlHttp.status == 404)
					{
						alert("Request URL does not exist");
					}
					else
					{
						alert("Error: status code is " + xmlHttp.status);
					}
				}
			}
			
			function callServerPOST()
			{
				createRequest();
				
				var username = document.getElementById("username").value;
				var password = document.getElementById("password").value;
				
				if((username == null) || (username == ""))
				{
					return;
				}
				
				if((password == null) || (password == ""))
				{
					return;
				}
				
				var xml = "<loginInfo><username>" + escape(username) + "<\/username><password>" + escape(password) + "<\/password><\/loginInfo>";
				var url = "test?timestamp=" + new Date().getTime();
				
				xmlHttp.open("POST", url, true);
				xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
				xmlHttp.onreadystatechange = updatePagePOST;
				xmlHttp.send(xml);
			}
			
			function updatePagePOST()
			{
				if(xmlHttp.readyState == 4)
				{
					if(xmlHttp.status == 200)
					{
						var response = xmlHttp.responseXML;
						var resultStr = response.getElementsByTagName("resultStr").value;
						document.getElementById("result").innerHTML = resultStr;
					}
					else if(xmlHttp.status == 403)
					{
						alert("Access denied.");
					}
					else if(xmlHttp.status == 404)
					{
						alert("Request URL does not exist");
					}
					else
					{
						alert("Error: status code is " + xmlHttp.status);
					}
				}
			}
		</script>
		
	</head>
	
	<body>
		<div id="result"></div>
		<form action="#">
			username:<input type="text" id="username" /><br>
			password:<input type="password" id="password" /><br>
			<input type="button" value="submitByGET" onclick="callServerGET();"/>
			&nbsp;&nbsp;&nbsp;&nbsp;
			<input type="button" value="submitByPOST" onclick="callServerPOST();"/>
		</form>
	</body>
</html>

Login.java源碼如下： 
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package ajax;
 
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
 
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
/**
 * The <code>Login</code> class is an ajax example.
 * 
 * @author Warren CC <warrenwuxj@sohu.com>
 * @version Login.java,v 1.1 2007-4-17 下午01:54:14 
 */
public class Login extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String username = request.getParameter("username");
		String password = request.getParameter("password");
 
		String resultStr = null;
		if ("warren".equals(username) && "123456".equals(password)) {
			resultStr = "success";
		} else {
			resultStr = "fail";
		}
 
		response.getWriter().write(resultStr);
	}
 
	@Override
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		StringBuffer strBuffer = new StringBuffer();
		boolean tag = false;
		String username = null;
		String password = null;
 
		BufferedReader reader = request.getReader();
		String readerLine = null;
 
		while ((readerLine = reader.readLine()) != null) {
			strBuffer.append(readerLine);
			tag = true;
		}
 
		if (tag) {
			String xmlStr = strBuffer.toString();
			Document xmlDoc = null;
 
			try {
				xmlDoc = DocumentBuilderFactory.newInstance()
						.newDocumentBuilder().parse(
								new ByteArrayInputStream(xmlStr.getBytes()));
			} catch (SAXException e) {
				e.printStackTrace();
			} catch (ParserConfigurationException e) {
				e.printStackTrace();
			}
 
			username = xmlDoc.getElementsByTagName("username").item(0)
					.getFirstChild().getNodeValue();
			password = xmlDoc.getElementsByTagName("password").item(0)
					.getFirstChild().getNodeValue();
		}
 
		StringBuffer resultXMLStr = new StringBuffer(
				"<?xml version=\"1.0\" encoding=\"utf-8\"?>");
		resultXMLStr.append("<results>");
		resultXMLStr.append("<resultStr>");
		
		if ("warren".equals(username) && "123456".equals(password)) {
			resultXMLStr.append("success");
		} else {
			resultXMLStr.append("fail");
		}
		
		resultXMLStr.append("</resultStr>");
		resultXMLStr.append("</results>");
		
		response.setContentType("text/xml; charset=utf-8");
		
		response.getWriter().write(resultXMLStr.toString());
	}
}

web.xml添加如下： 
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<servlet>
		<servlet-name>testLogin</servlet-name>
		<servlet-class>ajax.Login</servlet-class>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>testLogin</servlet-name>
		<url-pattern>/test</url-pattern>
	</servlet-mapping>


OK，完成了，希望對初學的有幫助，也希望和大家共同學習。

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