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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_JSP编程_

2023-05-25 314人已围观

简介 AJAX 自学练习 无刷新提交并修改数据库数据并显示_JSP编程_

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"%>




Insert title here




    
    




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;
    }
}
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