AJAX 自學練習無重新整理提交並修改資料庫資料並顯示

最後更新：2018-12-08 來源：互聯網

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request.jsp頁面中有rocarsId,和ccrn兩個text。
對應在資料庫中表格 rocars表的msg_id,ccrn兩個欄位。現在要實現在介面上修改ccrn的值，ajax提交到response.jsp頁面，並調用RocarsEntiy.updateCcrn方法更新對應的ccrn，最後無重新整理顯示
代碼：
request.jsp 複製代碼代碼如下:<%@ 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複製代碼代碼如下:<%@ 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 複製代碼代碼如下: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
這裡可以直接使用JDBC也可以調用weblogic的資料來源JNDI。複製代碼代碼如下: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;
}
}

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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