Java Socket+mysql实现简易文件上传器的代码

最近跟着某网站学习了一个小项目，因为白天有课，所以都是晚上写的，今天把它完成了。

项目主要是实现一个文件上传器，通过客户端的登陆，把本地文件上传到服务器的数据库（本地的）。

首先建两个表如下：

一个文件信息表

CREATE TABLE `fileinfo` ( 
`Fname` char(50) NOT NULL, 
`FInfo` blob NOT NULL, 
`FId` int(10) NOT NULL AUTO_INCREMENT, 
PRIMARY KEY (`FId`) 
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8; 

一个用户信息表

CREATE TABLE `user` ( 
`username` char(25) NOT NULL, 
`password` char(25) NOT NULL, 
`useid` int(10) NOT NULL AUTO_INCREMENT, 
PRIMARY KEY (`useid`) 
) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8;

User类

package fileUpload; 
import java.io.Serializable; 
/* 
* 用户实体类 
*/ 
public class User implements Serializable{ 
private static final long serialVersionUID = -7279093338433393181L; 
private int useid;//用户编号 
private String usename;//用户名 
private String usepsd;//用户密码 
public User(){ 
} 
public User(String usename,String usepsd){ 
super(); 
this.usename = usename; 
this.usepsd = usepsd; 
} 
public User(int useid,String usename,String usepsd){ 
super(); 
this.useid = useid; 
this.usename = usename; 
this.usepsd = usepsd; 
} 
public int getUseid() { 
return useid; 
} 
public void setUseid(int useid) { 
this.useid = useid; 
} 
public String getUsename() { 
return usename; 
} 
public void setUsename(String usename) { 
this.usename = usename; 
} 
public String getUsepsd() { 
return usepsd; 
} 
public void setUsepsd(String usepsd) { 
this.usepsd = usepsd; 
} 
}

UserService类

package fileUpload; 
/** 
* 用户登陆与注册操作类 
*/ 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
public class UserService { 
private Connection conn = null; 
private PreparedStatement ptmt = null; 
private ResultSet rs = null; 
// 用户登录 
public boolean login(User user) { 
String url = "jdbc:mysql://localhost:3306/fileupload";// 数据库连接字符串 
String sql = "select * from user where username=? and password=?"; 
try { 
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
conn = DriverManager.getConnection(url, "root", "1995520"); 
ptmt = conn.prepareStatement(sql); 
ptmt.setString(1, user.getUsename()); 
ptmt.setString(2, user.getUsepsd()); 
rs = ptmt.executeQuery(); 
if (rs.next()) { 
return true; 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} finally { 
try { 
rs.close(); 
ptmt.close(); 
} catch (SQLException e) { 
e.printStackTrace(); 
} 
} 
return false; 
} 
//用户注册 
public boolean register(User user){ 
System.out.println("hello"); 
String url = "jdbc:mysql://localhost:3306/fileupload";// 数据库连接字符串 
String sql = "insert into user(username,password) values (?,?)"; 
try { 
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
conn = DriverManager.getConnection(url, "root", "1995520"); 
ptmt = conn.prepareStatement(sql); 
ptmt.setString(1, user.getUsename()); 
ptmt.setString(2, user.getUsepsd()); 
ptmt.executeUpdate(); 
} catch (Exception e) { 
e.printStackTrace(); 
return false; 
} finally { 
try { 
//rs.close(); 
ptmt.close(); 
} catch (SQLException e) { 
e.printStackTrace(); 
} 
} 
return true; 
} 
}

FileIofo类

package fileUpload; 
import java.io.Serializable; 
/* 
* 文件实体类 
*/ 
public class FileInfo implements Serializable{ 
private static final long serialVersionUID = 2554622626228481455L; 
private int fid;//文件编号 
private String fname;//文件名 
private byte[] fcontent;//文件内容 
public FileInfo(){ 
} 
public FileInfo(String fname,byte[] fcontent){ 
super(); 
this.fname = fname; 
this.fcontent = fcontent; 
} 
public FileInfo(int fid,String fname,byte[] fcontent){ 
super(); 
this.fid = fid; 
this.fname = fname; 
this.fcontent = fcontent; 
} 
public int getFid() { 
return fid; 
} 
public void setFid(int fid) { 
this.fid = fid; 
} 
public String getFname() { 
return fname; 
} 
public void setFname(String fname) { 
this.fname = fname; 
} 
public byte[] getFcontent() { 
return fcontent; 
} 
public void setFcontent(byte[] fcontent) { 
this.fcontent = fcontent; 
} 
}

FileService类

package fileUpload; 
/** 
* 文件上传操作类 
*/ 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.SQLException; 
public class FileService { 
private Connection conn = null; 
private PreparedStatement ptmt = null; 
//将文件保存到数据库中 
public boolean save(FileInfo file){ 
String url = "jdbc:mysql://localhost:3306/fileupload";//数据库连接字符串 
String sql = "insert into fileinfo(Fname,Finfo) value (?,?)"; 
try{ 
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
conn = DriverManager.getConnection(url, "root", "1995520"); 
ptmt = conn.prepareStatement(sql); 
ptmt.setString(1, file.getFname()); 
ptmt.setBytes(2,file.getFcontent()); 
ptmt.executeUpdate(); 
}catch(Exception e){ 
e.printStackTrace(); 
return false; 
}finally{ 
try { 
ptmt.close(); 
} catch (SQLException e) { 
e.printStackTrace(); 
} 
} 
return true; 
} 
}

package fileUpload;

import java.io.IOException; 
import java.net.ServerSocket; 
import java.net.Socket; 
/* 
* 启动服务器类 
*/ 
public class StartServer { 
@SuppressWarnings("resource") 
public static void main(String[] args){ 
try { 
// 1.创建一个服务器端Socket，即ServerSocket,指定绑定的端口，并监听此端口 
ServerSocket serverSocket = new ServerSocket(8888); 
Socket socket = null; 
System.out.println("服务器已启动，等待客户端的连接..."); 
//循环监听等待客户端的连接 
while (true) { 
// 2.调用accept()方法开始监听，等待客户端的连接 
socket = serverSocket.accept(); 
//创建一个新的线程 
ServerThread serverThread = new ServerThread(socket); 
//启动线程 
serverThread.start(); 
} 
} catch (IOException e) { 
// TODO 自动生成的 catch 块 
e.printStackTrace(); 
} 
} 
} 
[java] view plain copy 在CODE上查看代码片派生到我的代码片
package fileUpload; 
import java.io.IOException; 
/** 
* 启动客户端类 
*/ 
public class StartClient { 
public static void main(String[] args) throws IOException{ 
SocketClient client = new SocketClient(); 
client.showMainMenu();//显示主菜单 
} 
}

package fileUpload;

import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.net.Socket; 
import javax.swing.JOptionPane; 
/* 
* 服务器端多线程处理类 
*/ 
public class ServerThread extends Thread { 
static Socket socket = null; 
private static ObjectInputStream ois = null;// 对象输入流 
private ObjectOutputStream oos = null;// 对象输出流 
private UserService us = new UserService();// 用户业务对象 
private FileService fs = new FileService();// 文件业务对象 
// 通过构造方法，初始化socket 
public ServerThread(Socket socket) { 
ServerThread.socket = socket; 
} 
public void run() { 
try { 
ois = new ObjectInputStream(socket.getInputStream());//接收客户端发来的消息 
oos = new ObjectOutputStream(socket.getOutputStream());//用来向客户端发送消息 
CommandTransfer transfer = (CommandTransfer) ois.readObject(); // 读取客户端发送到服务器的指令操作 
transfer = execute(transfer); // 执行客户端送到服务器的指令操作 
oos.writeObject(transfer);// 响应客户端 
} catch (IOException | ClassNotFoundException e) { 
e.printStackTrace(); 
} 
} 
/* 
* 执行客户端发送到服务器的指令操作 
*/ 
private CommandTransfer execute(CommandTransfer transfer) { 
String cmd = transfer.getCmd();// 获取当前操作的指令 
if (cmd.equals("login")) { // 用户登录 
User user =(User)transfer.getData(); 
boolean flag = us.login(user); 
if(flag) 
JOptionPane.showMessageDialog(null, "登陆成功！"); 
transfer.setFlag(flag); 
if(flag){//判断登陆是否成功 
transfer.setResult("登陆成功！"); 
}else{ 
transfer.setResult("用户名或密码不正确，请重新登陆！"); 
} 
}else if(cmd.equals("register")){//用户注册 
User user = (User) transfer.getData(); 
us.register(user);//注册用户 
boolean flag = us.register(user); 
if(flag) 
JOptionPane.showMessageDialog(null, "注册成功！"); 
transfer.setFlag(flag); 
if(flag){ 
transfer.setResult("注册成功！"); 
}else{ 
transfer.setResult("注册失败！"); 
} 
}else if(cmd.equals("uploadFile")){ 
FileInfo file =(FileInfo)transfer.getData(); 
fs.save(file); 
boolean flag = fs.save(file); 
if(flag) 
JOptionPane.showMessageDialog(null, "上传成功！"); 
transfer.setFlag(flag); 
if(flag){ 
transfer.setResult("上传成功！"); 
}else{ 
transfer.setResult("上传失败！"); 
} 
} 
return transfer; 
} 
} 
package fileUpload; 
import java.io.BufferedInputStream; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.net.Socket; 
import java.net.UnknownHostException; 
import java.util.Scanner; 
/** 
* 主菜单类 
*/ 
public class SocketClient { 
Scanner input = new Scanner(System.in); 
private static Socket socket = null;// 客户端Socket 
// 主菜单 
public void showMainMenu() throws IOException { 
System.out.println("******欢迎使用xx文件上传器******"); 
System.out.println("1.登录\n2.注册\n3.退出"); 
System.out.println("****************************"); 
System.out.println("请选择："); 
int choice = input.nextInt();// 获取用户的选择 
socket = new Socket("localhost", 8888); 
switch (choice) { 
case 1: 
showLogin();// 登录 
break; 
case 2: 
showRegister();// 注册 
break; 
case 3: 
System.out.println("欢迎你对本系统的支持"); 
System.exit(0); 
default: 
System.out.println("输入有误！"); 
System.exit(0); 
} 
} 
// 用户注册 
private void showRegister() throws IOException { 
User user = new User(); 
CommandTransfer transfer = new CommandTransfer(); 
int count = 0;// 登陆次数 
while (true) { 
count++; 
if (count > 3) { 
System.out.println("你已连续3次登陆失败，程序退出！"); 
System.exit(0); 
} 
System.out.print("请输入用户名："); 
user.setUsename(input.next()); 
System.out.print("请输入密码："); 
user.setUsepsd(input.next()); 
System.out.print("请再次输入密码："); 
String rePassword = input.next(); 
if (!user.getUsepsd().equals(rePassword)) { 
System.out.println("两次输入的密码不一致！"); 
System.out.println("**********************"); 
continue; 
} 
transfer.setCmd("register"); 
transfer.setData(user); 
try { 
sendData(transfer);// 将数据发送到服务器 
transfer = getData();// 获取服务器返回的数据 
System.out.println(transfer.getResult());// 输出显示结果 
System.out.println("*****************************"); 
if (transfer.isFlag()) { 
break;// 如果注册成功，则不再重复执行注册 
} 
} catch (UnknownHostException e) { 
e.printStackTrace(); 
} catch (IOException e) { 
e.printStackTrace(); 
} finally { 
} 
} 
showLogin();// 注册成功后显示登陆 
} 
// 获得服务器的数据 
public static CommandTransfer getData() throws IOException { 
// TODO Auto-generated method stub 
ObjectInputStream ois = null; 
CommandTransfer res = null; 
try { 
if(socket.isClosed()) 
socket = new Socket("localhost", 8888); 
ois = new ObjectInputStream(socket.getInputStream()); 
res = (CommandTransfer) ois.readObject(); 
} catch (IOException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} catch (ClassNotFoundException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} finally { 
if (ois != null) { 
try { 
ois.close(); 
//socket.close(); 
} catch (IOException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} 
} 
} 
return res; 
} 
/* 
* 上传文件 
*/ 
private void showUploadFile() throws IOException { 
System.out.println("请输入上传文件的绝对路径："); 
String path = input.next(); 
FileInfo file = null; 
FileInputStream fis = null; 
BufferedInputStream bis = null; 
String fname = path.substring(path.lastIndexOf("/") + 1); 
try { 
fis = new FileInputStream(path); 
byte[] fcontent = new byte[fis.available()]; 
bis = new BufferedInputStream(fis); 
bis.read(fcontent); 
file = new FileInfo(fname, fcontent); 
} catch (FileNotFoundException e) { 
e.printStackTrace(); 
} finally { 
bis.close(); 
fis.close(); 
} 
CommandTransfer transfer = new CommandTransfer(); 
transfer.setCmd("uploadFile"); 
transfer.setData(file); 
try { 
sendData(transfer);// 将数据发送到服务器 
transfer = getData();// 获取服务器返回的数据 
System.out.println(transfer.getResult());// 输出显示结果 
} catch (UnknownHostException e) { 
e.printStackTrace(); 
} catch (IOException e) { 
e.printStackTrace(); 
} finally { 
} 
} 
// 向服务器发送数据 
public static void sendData(CommandTransfer cmd) throws IOException { 
// TODO Auto-generated method stub 
ObjectOutputStream oos = null; 
try { 
if(socket.isClosed())//判断socket是否被关闭，如果关闭，就打开 
socket = new Socket("localhost", 8888); 
oos = new ObjectOutputStream(socket.getOutputStream()); 
oos.writeObject(cmd); 
} catch (IOException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} 
} 
// 用户登陆 
private void showLogin() throws IOException { 
User user = new User(); 
CommandTransfer transfer = new CommandTransfer(); 
while (true) { 
System.out.print("请输入用户名："); 
user.setUsename(input.next()); 
System.out.print("请输入密码："); 
user.setUsepsd(input.next()); 
transfer.setCmd("login"); 
transfer.setData(user); 
try { 
sendData(transfer);// 将数据发送到服务器 
transfer = getData();// 获取服务器返回的数据 
System.out.println(transfer.getResult());// 输出显示结果 
System.out.println("*****************************"); 
if (transfer.isFlag()) { 
break;// 如果注册成功，则不再重复执行注册 
} 
} catch (UnknownHostException e) { 
e.printStackTrace(); 
} catch (IOException e) { 
e.printStackTrace(); 
} finally { 
} 
} 
showUploadFile();// 登陆成功后进行文件的上传 
} 
}

运行效果图如下：

文件已保存到数据库中了，这个项目对于想练练Socket通信和mysql的朋友来说，还是挺不错的。

以上所述是小编给大家介绍的Java Socket+mysql实现简易文件上传器，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持！

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