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AJAX 自学练习 无刷新提交并修改数据库数据并显示

程序员文章站 2024-02-15 21:51:47
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...
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;
    }
}