用java多线程实现服务器与客户端之间的文件传输的代码！！！急！！！！

程序分Server和Client

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服务器端打开侦听的端口，一有客户端连接就创建两个新的线程来负责这个连接

一个负责客户端发送的信息(ClientMsgCollectThread 类)，

另一个负责通过该Socket发送数据（ServerMsgSendThread ）

Server.java代码如下:

/*

* 创建日期 2009-3-7

*

* TODO 要更改此生成的文件的模板，请转至

* 窗口 － 首选项 － Java － 代码样式 － 代码模板

*/

package faue.MutiUser;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

/**

* 服务器端

*

* @author Faue

*/

public class Server extends ServerSocket {

private static final int SERVER_PORT = 10000;

/**

* 构造方法，用于实现连接的监听

*

* @throws IOException

*/

public Server() throws IOException {

super(SERVER_PORT);

try {

while (true) {

Socket socket = super.accept();

new Thread(new ClientMsgCollectThread(socket), "getAndShow"

+ socket.getPort()).start();

new Thread(new ServerMsgSendThread(socket), "send"

+ socket.getPort()).start();

}

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String[] args) throws IOException {

new Server();

}

/**

* 该类用于创建接收客户端发来的信息并显示的线程

*

* @author Faue

* @version 1.0.0

*/

class ClientMsgCollectThread implements Runnable {

private Socket client;

private BufferedReader in;

private StringBuffer inputStringBuffer = new StringBuffer("Hello");

/**

* 得到Socket的输入流

*

* @param s

* @throws IOException

*/

public ClientMsgCollectThread(Socket s) throws IOException {

client = s;

in = new BufferedReader(new InputStreamReader(client

.getInputStream(), "GBK"));

}

public void run() {

try {

while (!client.isClosed()) {

inputStringBuffer.delete(0, inputStringBuffer.length());

inputStringBuffer.append(in.readLine());

System.out.println(getMsg(inputStringBuffer.toString()));

}

} catch (IOException e) {

//e.printStackTrace();

System.out.println(client.toString() + " is closed!");

}

}

/**

* 构造显示的字符串

*

* @param line

* @return

*/

private String getMsg(String line) {

return client.toString() + " says:" + line;

}

}

/**

* 该类用于创建发送数据的线程

*

* @author Faue

* @version 1.0.0

*/

class ServerMsgSendThread implements Runnable {

private Socket client;

private PrintWriter out;

private BufferedReader keyboardInput;

private StringBuffer outputStringBuffer = new StringBuffer("Hello");

/**

* 得到键盘的输入流

*

* @param s

* @throws IOException

*/

public ServerMsgSendThread(Socket s) throws IOException {

client = s;

out = new PrintWriter(client.getOutputStream(), true);

keyboardInput = new BufferedReader(new InputStreamReader(System.in));

}

public void run() {

try {

while (!client.isClosed()) {

outputStringBuffer.delete(0, outputStringBuffer.length());

outputStringBuffer.append(keyboardInput.readLine());

out.println(outputStringBuffer.toString());

}

} catch (IOException e) {

//e.printStackTrace();

System.out.println(client.toString() + " is closed!");

}

}

}

}

客户端：

实现基于IP地址的连接，连接后也创建两个线程来实现信息的发送和接收

/*

* 创建日期 2009-3-7

*

*/

package faue.MutiUser;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;

/**

* 客户端

*

* @author Faue

*/

public class Client {

private Socket mySocket;

/**

* 创建线程的构造方法

*

* @param IP

* @throws IOException

*/

public Client(String IP) throws IOException {

try {

mySocket = new Socket(IP, 10000);

new Thread(new ServerMsgCollectThread(mySocket), "getAndShow"

+ mySocket.getPort()).start();

new Thread(new ClientMsgSendThread(mySocket), "send"

+ mySocket.getPort()).start();

} catch (IOException e) {

//e.printStackTrace();

System.out.println("Server.IP:" + IP

+ " port:10000 can not be Connected");

}

}

public static void main(String[] args) throws IOException {

try {

new Client(args[0]);

} catch (Exception e) {

System.out.println("输入的IP地址错误");

}

}

/**

* 该类用于创建接收服务端发来的信息并显示的线程

*

* @author Faue

* @version 1.0.0

*/

class ServerMsgCollectThread implements Runnable {

private Socket client;

private BufferedReader in;

private StringBuffer inputStringBuffer = new StringBuffer("Hello");

/**

* 得到Socket的输入流

*

* @param s

* @throws IOException

*/

public ServerMsgCollectThread(Socket s) throws IOException {

client = s;

in = new BufferedReader(new InputStreamReader(client

.getInputStream(), "GBK"));

}

public void run() {

try {

while (!client.isClosed()) {

inputStringBuffer.delete(0, inputStringBuffer.length());

inputStringBuffer.append(in.readLine());

System.out.println(getMsg(inputStringBuffer.toString()));

}

} catch (IOException e) {

//e.printStackTrace();

System.out.println(client.toString() + " is closed!");

System.exit(0);

}

}

/**

* 构造输入字符串

*

* @param line

* @return

*/

private String getMsg(String line) {

return client.toString() + " says:" + line;

}

}

/**

* 该类用于创建发送数据的线程

*

* @author Faue

* @version 1.0.0

*/

class ClientMsgSendThread implements Runnable {

private Socket client;

private PrintWriter out;

private BufferedReader keyboardInput;

private StringBuffer outputStringBuffer = new StringBuffer("Hello");

/**

* 得到键盘的输入流

*

* @param s

* @throws IOException

*/

public ClientMsgSendThread(Socket s) throws IOException {

client = s;

out = new PrintWriter(client.getOutputStream(), true);

keyboardInput = new BufferedReader(new InputStreamReader(System.in));

}

public void run() {

try {

while (!client.isClosed()) {

outputStringBuffer.delete(0, outputStringBuffer.length());

outputStringBuffer.append(keyboardInput.readLine());

out.println(outputStringBuffer.toString());

}

out.println("--- See you, bye! ---");

} catch (IOException e) {

//e.printStackTrace();

System.out.println(client.toString() + " is closed!");

System.exit(0);

}

}

}

}

如果对您有帮助，请记得采纳为满意答案，谢谢！祝您生活愉快！

vaela

java中如何实现从客户端发送文件到服务器端？

服务器端源码：\x0d\x0aimport java.io.BufferedReader;\x0d\x0aimport java.io.File;\x0d\x0aimport java.io.FileNotFoundException;\x0d\x0aimport java.io.FileOutputStream;\x0d\x0aimport java.io.IOException;\x0d\x0aimport java.io.InputStream;\x0d\x0aimport java.io.InputStreamReader;\x0d\x0aimport java.net.ServerSocket;\x0d\x0aimport java.net.Socket;\x0d\x0a\x0d\x0a/**\x0d\x0a *\x0d\x0a * 文件名：ServerReceive.java\x0d\x0a * 实现功能：作为服务器接收客户端发送的文件\x0d\x0a *\x0d\x0a * 具体实现过程：\x0d\x0a * 1、建立SocketServer，等待客户端的连接\x0d\x0a * 2、当有客户端连接的时候，按照双方的约定，这时要读取一行数据\x0d\x0a * 其中保存客户端要发送的文件名和文件大小信息\x0d\x0a * 3、根据文件名在本地创建文件，并建立好流通信\x0d\x0a * 4、循环接收数据包，将数据包写入文件\x0d\x0a * 5、当接收数据的长度等于提前文件发过来的文件长度，即表示文件接收完毕，关闭文件\x0d\x0a * 6、文件接收工作结束\x0d\x0a\x0d\x0apublic class ServerReceive {\x0d\x0a \x0d\x0a public static void main(String[] args) {\x0d\x0a \x0d\x0a /**与服务器建立连接的通信句柄*/\x0d\x0a ServerSocket ss = null;\x0d\x0a Socket s = null;\x0d\x0a \x0d\x0a /**定义用于在接收后在本地创建的文件对象和文件输出流对象*/\x0d\x0a File file = null;\x0d\x0a FileOutputStream fos = null;\x0d\x0a \x0d\x0a /**定义输入流，使用socket的inputStream对数据包进行输入*/\x0d\x0a InputStream is = null;\x0d\x0a \x0d\x0a /**定义byte数组来作为数据包的存储数据包*/\x0d\x0a byte[] buffer = new byte[4096 * 5];\x0d\x0a \x0d\x0a /**用来接收文件发送请求的字符串*/\x0d\x0a String comm = null;\x0d\x0a\x0d\x0a/**建立socekt通信，等待服务器进行连接*/\x0d\x0a try {\x0d\x0a ss = new ServerSocket(4004);\x0d\x0a s = ss.accept();\x0d\x0a } catch (IOException e) {\x0d\x0a e.printStackTrace();\x0d\x0a }\x0d\x0a\x0d\x0a/**读取一行客户端发送过来的约定信息*/\x0d\x0a try {\x0d\x0a InputStreamReader isr = new InputStreamReader(s.getInputStream());\x0d\x0a BufferedReader br = new BufferedReader(isr);\x0d\x0a comm = br.readLine();\x0d\x0a } catch (IOException e) {\x0d\x0a System.out.println("服务器与客户端断开连接");\x0d\x0a }\x0d\x0a \x0d\x0a /**开始解析客户端发送过来的请求命令*/\x0d\x0a int index = comm.indexOf("/#");\x0d\x0a \x0d\x0a /**判断协议是否为发送文件的协议*/\x0d\x0a String xieyi = comm.substring(0, index);\x0d\x0a if(!xieyi.equals("111")){\x0d\x0a System.out.println("服务器收到的协议码不正确");\x0d\x0a return;\x0d\x0a }\x0d\x0a \x0d\x0a /**解析出文件的名字和大小*/\x0d\x0a comm = comm.substring(index + 2);\x0d\x0a index = comm.indexOf("/#");\x0d\x0a String filename = comm.substring(0, index).trim();\x0d\x0a String filesize = comm.substring(index + 2).trim();\x0d\x0a\x0d\x0a/**创建空文件，用来进行接收文件*/\x0d\x0a file = new File(filename);\x0d\x0a if(!file.exists()){\x0d\x0a try {\x0d\x0a file.createNewFile();\x0d\x0a } catch (IOException e) {\x0d\x0a System.out.println("服务器端创建文件失败");\x0d\x0a }\x0d\x0a }else{\x0d\x0a /**在此也可以询问是否覆盖*/\x0d\x0a System.out.println("本路径已存在相同文件，进行覆盖");\x0d\x0a }\x0d\x0a \x0d\x0a /**【以上就是客户端代码中写到的服务器的准备部分】*/\x0d\x0a\x0d\x0a/**\x0d\x0a * 服务器接收文件的关键代码*/\x0d\x0a try {\x0d\x0a /**将文件包装到文件输出流对象中*/\x0d\x0a fos = new FileOutputStream(file);\x0d\x0a long file_size = Long.parseLong(filesize);\x0d\x0a is = s.getInputStream();\x0d\x0a /**size为每次接收数据包的长度*/\x0d\x0a int size = 0;\x0d\x0a /**count用来记录已接收到文件的长度*/\x0d\x0a long count = 0;\x0d\x0a \x0d\x0a /**使用while循环接收数据包*/\x0d\x0a while(count

回答于 2022-12-11

java点对点传输文件代码

//在我电脑运行没问题,把E:/EKI.txt传送到D:/EKI.txt你可以换成其它文件

//先运行Server,然后client,共三个class有问题QQ23400262

package ch.socket.file;

import java.io.*;

import java.net.ServerSocket;

import java.net.Socket;

public class Server extends Thread {

public static int port = 6789;

public static String host = "127.0.0.1";

private static ServerSocket server = null;

public void run() {

if (server == null) {

try {

// 1、新建ServerSocket实例

server = new ServerSocket(port);

} catch (IOException e) {

e.printStackTrace();

}

}

System.out.println("服务器启动...");

while (true) {

try {

// 2、访问ServerSocket实例的accept方法取得一个客户端Socket对象

Socket client = server.accept();

if (client == null)

continue;

new SocketConnection(client, "D:\\").start();

} catch (IOException ex) {

ex.printStackTrace();

}

}

}

public static void main(String[] args) {

new Server().start();

}

}

package ch.socket.file;

import java.io.*;

import java.io.IOException;

import java.net.Socket;

import java.net.UnknownHostException;

public class Client {

private Socket client;

private boolean connected;

public boolean isConnected() {

return connected;

}

public void setConnected(boolean connected) {

this.connected = connected;

}

public Client(String host, int port) {

try {

// 1、新建Socket对象

client = new Socket(host, port);

System.out.println("服务器连接成功！");

this.connected = true;

} catch (UnknownHostException e) {

this.connected = false;

close();

} catch (IOException e) {

System.out.println("服务器连接失败！");

this.connected = false;

close();

}

}

/**

* 将文件内容发送出去

*

* @param filepath

* 文件的全路径名

*/

public void sendFile(String filepath) {

DataOutputStream out = null;

DataInputStream reader = null;

try {

if (client == null)

return;

File file = new File(filepath);

reader = new DataInputStream(new BufferedInputStream(

new FileInputStream(file)));

// 2、将文件内容写到Socket的输出流中

out = new DataOutputStream(client.getOutputStream());

out.writeUTF(file.getName()); // 附带文件名

int bufferSize = 2048; // 2K

byte[] buf = new byte[bufferSize];

int read = 0;

while ((read = reader.read(buf)) != -1) {

out.write(buf, 0, read);

}

out.flush();

} catch (IOException ex) {

ex.printStackTrace();

close();

} finally {

try {

reader.close();

out.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

* 关闭Socket

*/

public void close() {

if (client != null) {

try {

client.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

public static void main(String[] args) {

Client client = new Client(Server.host, Server.port);

if (client.isConnected()) {

client.sendFile("E:\\EKI.txt");

client.close();

}

}

}

package ch.socket.file;

import java.net.Socket;

import java.io.*;

public class SocketConnection extends Thread{

private Socket client;

private String filepath;

public SocketConnection(Socket client, String filepath){

this.client = client;

this.filepath = filepath;

}

public void run(){

if(client == null) return;

DataInputStream in = null;

DataOutputStream writer = null;

try{

//3、访问Socket对象的getInputStream方法取得客户端发送过来的数据流

in = new DataInputStream(new BufferedInputStream(client.getInputStream()));

String fileName = in.readUTF(); //取得附带的文件名

if(filepath.endsWith("/") == false filepath.endsWith("\\") == false){

filepath += "\\";

}

filepath += fileName;

//4、将数据流写到文件中

writer = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(new File(filepath)))));

int bufferSize = 2048;

byte[] buf = new byte[bufferSize];

int read = 0;

while((read=in.read(buf)) != -1){

writer.write(buf, 0, read);

}

writer.flush();

System.out.println("数据接收完毕");

}catch(IOException ex){

ex.printStackTrace();

}finally{

try{

in.close();

writer.close();

client.close();

}catch(IOException e){

e.printStackTrace();

}

}

}

}

java 文件上传的代码，尽量详细一点。。。

// 这是我写的一个方法，里面只需要传两个参数就OK了，在任何地方调用此方法都可以文件上传

/**

* 上传文件

* @param file待上传的文件

* @param storePath待存储的路径(该路径还包括文件名)

*/

public void uploadFormFile(FormFile file,String storePath)throws Exception{

// 开始上传

InputStream is =null;

OutputStream os =null;

try {

is = file.getInputStream();

os = new FileOutputStream(storePath);

int bytes = 0;

byte[] buffer = new byte[8192];

while ((bytes = is.read(buffer, 0, 8192)) != -1) {

os.write(buffer, 0, bytes);

}

os.close();

is.close();

} catch (Exception e) {

throw e;

}

finally{

if(os!=null){

try{

os.close();

os=null;

}catch(Exception e1){

;

}

}

if(is!=null){

try{

is.close();

is=null;

}catch(Exception e1){

;

}

}

}

}

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