实验报告——RMI+JDBC远端数据库的访问

package com.rmiDB;

import java.io.Serializable;

import java.sql.*;

public class DBManager {

    private static final String userName = "root";

    private static final String password = "";

    private static final String private static final String dburl="jdbc:mysql://localhost:3306/rmiDB?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC";   

private static final String driver="com.mysql.jdbc.Driver";

    private static Connection conn = null;

    private static ResultSet rs = null;

private static Statement stmt = null;

    public static Connection getConn(){

        try{

            Class.forName(driver);

            conn = DriverManager.getConnection(dburl,userName,password);

        }catch(ClassNotFoundException e){

            System.out.println("没有找到数据库驱动程序");

        }catch(SQLException e){

         System.out.println("数据库连接时出现异常，可能由于数据库服务未启动造成，请先启动数据库服务");

        }

        return conn;

}

    public static void createTable(){

        String sql = "create table stu(stuNo varchar(10),stuName varchar(10),grade float);";

        conn = getConn();

        try{

            stmt = conn.createStatement();

            stmt.execute(sql);

            stmt.close();

            conn.close();

        }catch(SQLException e){

            e.printStackTrace();

        }

}

    public static void insert(Student stu){

        String sql = "insert into stu values('"+stu.getStuNo()+"','"+stu.getStuName()+"',"+stu.getGrade()+")";

        conn = getConn();

        try{

            stmt = conn.createStatement();

            stmt.executeUpdate(sql);

            stmt.close();

            conn.close();

        }catch(SQLException e){

            e.printStackTrace();

        }

}

    public static Student getStu(String stuNo){

        String sql = "select * from stu where stuNo = "+stuNo;

        conn = getConn();

        Student stu = new Student();

        try{

            stmt = conn.createStatement();

            rs = stmt.executeQuery(sql);

            if(rs.next()){

                stu.setStuNo(rs.getString(1));

                stu.setStuName(rs.getString(2));

                stu.setGrade(rs.getFloat(3));

            }

            stmt.close();

            conn.close();

        }catch(SQLException e){

            e.printStackTrace();

        }

        return stu;

}

    public static class Student implements Serializable{

        private String stuNo="";

        private String stuName="";

        private float grade=0.0f;

        public Student(){}

        public String getStuNo() {

            return stuNo;

        }

        public void setStuNo(String stuNo) {

            this.stuNo = stuNo;

        }

        public String getStuName() {

            return stuName;

        }

        public void setStuName(String stuName) {

            this.stuName = stuName;

        }

        public float getGrade() {

            return grade;

        }

        public void setGrade(float grade) {

            this.grade = grade;

        }

    }

}

package com.rmiDB;

import java.rmi.Remote;

import java.rmi.RemoteException;

import com.rmiDB.DBManager.Student;

public interface DBServer extends Remote{

    public void createTable() throws RemoteException;

    public void insert(Student stu)throws RemoteException;

    public Student getStu(String stuNo)throws RemoteException;

}

package com.rmiDB;

import java.rmi.server.*;

import java.rmi.*;

import com.rmiDB.DBManager.Student;

public class DBServerImpl extends UnicastRemoteObject implements DBServer{

    private static final long serialVersionUID = -7777277221L;

    public DBServerImpl() throws RemoteException{

        super();

    }

    @Override

    public void createTable() throws RemoteException{

        DBManager.createTable();

    }

    @Override

    public Student getStu(String stuNo) throws RemoteException{

        return DBManager.getStu(stuNo);

    }

    @Override

    public void insert(Student stu) throws RemoteException{

        DBManager.insert(stu);

    }

}

package com.rmiDB;

import java.rmi.*;

import java.rmi.registry.LocateRegistry;

public class DeployServer{

    public DeployServer(){

}

    public static void main(String[] args) {

        try{

            DBServer ds = new DBServerImpl();

            LocateRegistry.createRegistry(1111);

            Naming.rebind("//localhost:1111/ds",ds);

            System.out.println("RMI服务器正在运行...");

        }catch(Exception e){

            e.printStackTrace();

        }

    }

}

package com.rmiClient;

import java.rmi.*;

import com.rmiDB.*;

import com.rmiDB.DBManager.Student;

public class RmiHelloClient{

    public static void main(String[] args) {

        try{

            DBServer ds = (DBServer)Naming.lookup("//172.29.19.57:1111/ds");  //本机ip地址

            ds.createTable();

            Student stu = new Student();

            stu.setStuNo("*******");

            stu.setStuName("Jerry");

            stu.setGrade(99.9f);

            ds.insert(stu);

            Student stu1 = new Student();

            stu1.setStuNo("2018001");

            stu1.setStuName("****");

            stu1.setGrade(89f);

            ds.insert(stu1);

            Student stu2 = ds.getStu("***********");

            System.out.println("学号： "+stu2.getStuNo());

            System.out.println("姓名： "+stu2.getStuName());

            System.out.println("成绩： "+stu2.getGrade());

            Student stu3 = ds.getStu("2018001");

            System.out.println("学号： "+stu3.getStuNo());

            System.out.println("姓名： "+stu3.getStuName());

            System.out.println("成绩： "+stu3.getGrade());

        }catch(Exception e){

            e.printStackTrace();

        }

    }

}