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JSP 中的 AJAX 自学练习 无刷新提交并修改数据库数据并显示

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-10-11   浏览: 108 ::
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对应在数据库中表格 rocars表的msg_id,ccrn两个字段。现在要实现在界面上修改ccrn的值，ajax提交到response.jsp页面，并调用RocarsEntiy.updateCcrn方法更新对应的ccrn，最后无刷新显示 request.jsp页面中有rocarsId,和ccrn两个text。
对应在数据库中表格 rocars表的msg_id,ccrn两个字段。现在要实现在界面上修改ccrn的值，ajax提交到response.jsp页面，并调用RocarsEntiy.updateCcrn方法更新对应的ccrn，最后无刷新显示
代码：
request.jsp
复制代码 代码如下:

<%@ 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=UTF-8">
<title>Insert title here</title>
<script language="javascript"><!--
function GetXmlHttpObject(){
var xmlHttp = null;
try{
xmlHttp = new XMLHttpRequest();
}catch(e){
try{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}
function updateCcrn(rocarsId,ccrn){
alert(rocarsId)
alert(ccrn)
xmlHttp = GetXmlHttpObject();
if(xmlHttp == null){
alert ("you browser don't support the ajax");
return;
}
var url = "./response.jsp";
url = url + "?rocarsId="+ rocarsId;
url = url + "&ccrn="+ ccrn;
url = url + "&sid ="+ Math.random();
xmlHttp.onreadystatechange = stateChanged;
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
}
function getCcrn(str){
xmlHttp = GetXmlHttpObject();
if(xmlHttp == null){
alert ("you browser don't support the ajax");
return;
}
var url = "./response.jsp";
url = url + "?q="+ str;
url = url + "&sid ="+ Math.random();
xmlHttp.onreadystatechange = stateChanged;
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
}
function stateChanged()
{
if(xmlHttp.readyState==4)
{
document.getElementById("rocarsccrn").value = xmlHttp.responseText;
}
}
// --></script>
</head>
<body>
<form name="form1" action="" method="post">
<label>rocarsId:</label><input type="text" name="rocarsId" value="140" />
<label>ccrn:</label><input type="text" id="rocarsccrn" name="rocarsccrn" onchange="updateCcrn(document.form1.rocarsId.value,this.value)"/>
</form>
</body>
</html>

response.jsp
复制代码 代码如下:

<%@ page language="java" contentType="text/plain; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.lwf.eus.util.*,java.util.*,com.lwf.eus.entity.*,com.lwf.eus.bean.*" %>
<%
String rocarsId = request.getParameter("rocarsId");
String ccrn = request.getParameter("ccrn");
System.out.println("rocarsId:" + rocarsId);
System.out.println("ccrn:" + ccrn);
RocarsEntity.updateCcrnById(rocarsId,ccrn);
out.print(ccrn);
%>

RocarsEntity.java
复制代码 代码如下:

package com.lwf.eus.entity;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import com.lwf.eus.bean.RocarsBean;
import com.lwf.eus.util.ConnectionManager;
public class RocarsEntity {
public static Vector getRocarsList() {
Vector vRocars = new Vector();
//Connection conn = ConnectionManager.getConnection();
Connection conn = ConnectionManager.getConnectionFromDS();
Statement st = ConnectionManager.createStatement(conn);
String sql = "select msg_id,ccrn from rocars";
ResultSet rs = null;
try {
rs = st.executeQuery(sql);
while (rs.next()) {
RocarsBean rocars = new RocarsBean();
rocars.setRocarsId(rs.getString(1));
rocars.setCcrn(rs.getString(2));
vRocars.addElement(rocars);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
return vRocars;
}
}
public static RocarsBean getRocarsListById(String rocarsId){
Connection conn = ConnectionManager.getConnectionFromDS();
Statement st = ConnectionManager.createStatement(conn);
String sql = "select * from rocars where msg_id=" + rocarsId;
ResultSet rs = null;
RocarsBean rocars= null;
try {
rs = st.executeQuery(sql);
rocars = new RocarsBean();
while (rs.next()) {
rocars.setRocarsId(rs.getString("msg_id"));
rocars.setCcrn(rs.getString("ccrn"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
return rocars;
}
}
public static void updateCcrnById(String rocarsId, String ccrn)
{
Connection conn = null;
Statement stmt = null;
try {
conn = ConnectionManager.getConnectionFromDS();
stmt = ConnectionManager.createStatement(conn);
String sqlStr = "update rocars set ccrn= '"+ ccrn + "'" + "where msg_id=" + rocarsId ;
stmt.executeUpdate(sqlStr);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}

ConnectionManager.java
这里可以直接使用JDBC也可以调用weblogic的数据源JNDI。
复制代码 代码如下:

package com.lwf.eus.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class ConnectionManager {
public static Connection getConnection(){
Connection conn = null;
String url = "jdbc:postgresql://192.168.0.180/getseus";
String userName = "getsdbadmin";
String pwd = "powerdb";
try {
Class.forName("org.postgresql.Driver").newInstance();
conn = DriverManager.getConnection(url,userName,pwd);
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (Exception e){
e.printStackTrace();
}
return conn;
}
public static Connection getConnectionFromDS(){
Connection conn = null;
Context ctx = null;
try {
ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("JNDIPG");
conn = ds.getConnection();
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static Statement createStatement(Connection conn){
Statement st = null;
try {
st = conn.createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
return st;
}
}