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AJAX 自学练习 无刷新提交并修改数据库数据并显

编程学习 2021-07-05 11:23www.dzhlxh.cn编程入门
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
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
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
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。
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;
    }
}
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