心得15--网络编程6-图片等二进制文件的上传与输出

1. 先说一个简单的案例

客户端：

package com.TcpJpg;

importjava.io.FileInputStream;

importjava.io.InputStream;

importjava.io.OutputStream;

importjava.net.Socket;

publicclass JpgClient {

/**

* 客户端：图片上传

* @param args

*/

publicstaticvoid main(String[]args) {

Socket s = null;

FileInputStream fi = null; //文件输入流从外面读文件数据

try {

s = new Socket("192.168.49.200",8000);

fi = new FileInputStream("d:\\1.jpg");

OutputStream out =s.getOutputStream(); // 通过socket获取输出流，进行信息通信

byte[] buf =newbyte[1024];

int len = 0;

while((len=fi.read(buf))!=-1) {

out.write(buf,0,len);

}

s.shutdownOutput();

InputStream in = s.getInputStream();

byte[] b =newbyte[1024];

System.out.println(new String(b,0,in.read(b)));

} catch (Exception e) {

e.printStackTrace();

}finally {

try {

s.close();

fi.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

服务器端：

packagecom.TcpJpg;

importjava.io.FileOutputStream;

importjava.io.InputStream;

importjava.io.OutputStream;

importjava.net.ServerSocket;

importjava.net.Socket;

publicclass JpgServer {

/**

* 服务器端：下载图片

*@param args

*/

public static void main(String[] args) {

ServerSocket ss = null;

Socket s = null;

FileOutputStream fo = null;

try {

ss = new ServerSocket(8000);

s = ss.accept();

InputStream in = s.getInputStream();

System.out.println(s.getInetAddress().getHostAddress()+"已连接");

fo = newFileOutputStream("d:\\girl.jpg");

byte[] buf = new byte[1024];

int len = 0;

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

fo.write(buf,0,len);

}

OutputStream out = s.getOutputStream();

out.write("上传成功！".getBytes()); // 将传进来的字符串转换成二进制保存

} catch (Exception e) {

e.printStackTrace();

}finally {

try {

fo.close();

s.close();

ss.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

2.
一个可以键盘输入、无限上传的案例

客户端：

packagecom.TcpJpg;

importjava.io.File;

importjava.io.FileInputStream;

importjava.io.InputStream;

importjava.io.OutputStream;

importjava.net.Socket;

publicclass JpgClient1 {

/**

* 客户端：图片上传

*@param args

*/

public static void main(String[] args) {

try {

if(args.length==0) { //如果参数恒等于0则表示没有传入参数即没有指定文件

System.out.println("请指定一个jpg文件");

return;

}

File f = new File(args[0]);

Socket s = newSocket("192.168.49.200",8000);

FileInputStream fi = newFileInputStream(f); //文件输入流从外面读文件数据

OutputStream out = s.getOutputStream(); // 通过socket获取输出流，进行信息通信

byte[] buf = new byte[1024];

int len = 0;

while((len=fi.read(buf))!=-1) {

out.write(buf,0,len);

}

s.shutdownOutput();

InputStream in = s.getInputStream();

byte[] b = new byte[1024];

System.out.println(newString(b,0,in.read(b)));

s.close();

fi.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

服务器端：

packagecom.TcpJpg;

importjava.io.File;

importjava.io.FileOutputStream;

importjava.io.IOException;

importjava.io.InputStream;

importjava.io.OutputStream;

importjava.net.ServerSocket;

importjava.net.Socket;

publicclass JpgServer1 {

/**

* 服务器端：下载图片

*@param args

*@throws IOException

*/

public static void main(String[] args) throwsIOException {

ServerSocket ss = new ServerSocket(8000);

while (true) {

Socket s = ss.accept();

new Thread(new JpgThread(s)).start();

}

}

}

classJpgThread implements Runnable {

private Socket s;

public JpgThread(Socket s) {

this.s = s;

}

public void run() {

int count = 1; // 设置一个计数器，使同一个客户端即IP能传多个文件

try {

String ip =s.getInetAddress().getHostAddress();

System.out.println(ip+"已连接");

InputStream in = s.getInputStream();

File dir = newFile("D:\\image"); //指定的客户端上传后的文件保存在该文件夹下

File f = new File(dir, ip +"(" + count + ").vbs");

while (f.exists()) { //判断一种条件：如果文件不存在则加一返回保存新文件

f = new File(dir, ip + "(" + (count++)+ ").vbs");

}

FileOutputStream fo = newFileOutputStream(f);

byte[] buf = new byte[1024];

int len = 0;

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

fo.write(buf, 0, len);

}

OutputStream out = s.getOutputStream();

out.write("上传成功！".getBytes());// 将传进来的字符串转换成二进制保存

fo.close();

s.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}