文件上传(客户端上传文件到服务器端)

Client.java客户端 public class Client { public static void main(String[] args) throws IOException { //客户端 Socket client = new Socket("localhost", 9999); InputStream is = new BufferedInputStream(new FileInputStream("a.txt")); byte[] car = new byte[10]; int len = -1; //输出流 DataOutputStream dos=new DataOutputStream(new BufferedOutputStream(client.getOutputStream())); DataInputStream dis=new DataInputStream(new BufferedInputStream(client.getInputStream())); while((len = is.read(car))!=-1){ //发送 dos.write(car,0,len); } dos.flush(); dos.close(); is.close(); client.close(); } } Server.java服务器 public class Server { public static void main(String[] args) throws IOException { //一个服务器 ServerSocket server = new ServerSocket(9999); //监听 Socket client = server.accept(); System.out.println("一个客户端已经连接成功...."); //获取输入流 DataInputStream dis=new DataInputStream(new BufferedInputStream(client.getInputStream())); DataOutputStream dos=new DataOutputStream(new BufferedOutputStream(client.getOutputStream())); OutputStream os=new BufferedOutputStream(new FileOutputStream("b.txt")); //读入数据 byte[] bytes = new byte[10]; int len =0; while( (len=dis.read(bytes))!=-1){ os.write(bytes,0,len); } //关闭 os.flush(); os.close(); client.close(); server.close(); } }

先启动服务器，再运行客户端

你会发现项目目录中多出了一个b.txt 文件，前提是这个目录中存在a.txt .