AJAX自学练习三：无刷新提交并修改数据库数据并显示

来源：互联网发布：时时彩后三遗漏数据编辑：程序博客网时间：2024/05/21 17:23

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

<%@ 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><mce:script language="javascript"></mce: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

<%@ 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

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 blocke.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。

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 blocke.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public static Statement createStatement(Connection conn){Statement st = null;try {st = conn.createStatement();} catch (SQLException e) {e.printStackTrace();}return st;}}