ajax+servlet实例
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页面javascript代码
<%@ 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 'test.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">
-->
<script type="text/javascript">
function findreporter(callno){
alert("@@@@@");
var url = "<%=request.getContextPath()%>/findreporterservlet?callno=121540076812308vsevyn4ns0wedzaof";
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET",url, true);
req.onreadystatechange = checkcontent;
req.send(null);
}
}
function checkcontent(){
if (req.readyState == 4) { // 判断对象状态
if (req.status == 200) { // 信息已经成功返回，开始处理信息
if(req.responseText != ""){
if(req.responseText!=""){
var returnValue=req.responseText.split("$");
alert(req.responseText);
document.getElementById('reporterUserName').value="";
document.getElementById('reporterUserTel').value="";
if(returnValue[0] && returnValue[0]!="_")
document.getElementById('reporterUserName').value=returnValue[0];
if(returnValue[1] && returnValue[1] != "null" ){
document.getElementById('reporterUserTel').value=returnValue[1];
}
}
}else{
document.getElementById('reporterUserName').value="";
document.getElementById('reporterUserTel').value="";
}
} else {//页面不正常
alert("您所请求的页面有异常。");
}
}
} //都是套路似的，可根据需要灵活运用
</script>
</head>
<body>
name:<input id="reporterUserName"/><br>
pwd:<input id="reporterUserTel"/>
<button value="点击" onclick="findreporter();">点击</button>
</body>
</html>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
servlet类 本人用jdbc链接数据库 数据库参数最好写在配置文件中 方便修改
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestServlet extends HttpServlet {
/**
* 构造函数
*/
public TestServlet() {
super();
}
/**
* destroy
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
}
/**
* 获取消息
* @param request HttpServletRequest
* @param response HttpServletResponse
* @throws ServletException
* @throws IOException
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType("text/xml; charset=GBK");
String callno = request.getParameter("callno");
String returnValue = "";
//导入新的数据
String sDBDriver = "oracle.jdbc.driver.OracleDriver";
String sConnStr = "jdbc:oracle:thin:@192.168.8.127:1521:cityinfo";
Connection conn = null;
ResultSet resultSet=null;
try {
Class.forName(sDBDriver);
try {
conn = DriverManager.getConnection(sConnStr, "cispkuerle", "cispkuerle");
Statement st = conn.createStatement();
resultSet = st.executeQuery("select * from t_urp_unit where id = '"+callno+"'");
while (resultSet.next()) {
String name = resultSet.getString("C_NAME");
String password = resultSet.getString("PASSWORD");
returnValue =name + "$" + password;//返回值设置 此处设置可自由设置
}
st.close();
conn.close();
} catch (SQLException sqlexception) {
sqlexception.printStackTrace();
}
} catch (ClassNotFoundException classnotfoundexception) {
classnotfoundexception.printStackTrace();
}
response.getWriter().write(returnValue);//返回值
}
/**
* 初始化
* @param config ServletConfig
* @throws ServletException gg
*/
public void init(ServletConfig config) throws ServletException {
}
}
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
web.xml文件添加内容
<servlet>
<servlet-name>findreporterservlet</servlet-name>
<servlet-class>com.gpzhang.TestServlet</servlet-class> //servlet类
</servlet>
<servlet-mapping>
<servlet-name>findreporterservlet</servlet-name>
<url-pattern>/findreporterservlet</url-pattern> //url访问路径相对应 参看url红色字体部分
</servlet-mapping>