输入输出流核心代码
所有的文件传输都是靠流,其中文件复制最具代表性.输入流和输出流,从输入流中读取数据写入到输出流中。
InputStream in = 输入源;
OutputStream os = 输出目的;
byte[] bytes = new byte[1024];
int len = 0;
while((len = in.read(bytes))!=-1){ //读取到文件末尾的话可以读到-1
os.write(bytes,0,len);
}
os.close();
in.close();
TCP图片上传客户端
1.Socket套接字连接服务器,指定ip和端口
Socket socket = Socket(String host, int port);
2.通过Socket获取字节输出流,向服务器写图片
OutputStream os = socket.getOutputStream();
3.创建输入流对象,读取图片数据源
FileInputStream fis = new FileInputStream(filePath);
4.读取图片,使用字节输出流,将图片写到服务器,采用字节数组进行缓冲
int len = 0;
byte[] bytes = new byte[1024];
while ((len = fis.read(bytes)) != -1){
os.write(bytes,0,len);
}
socket.shutdownOutput();//文件读完时给服务器写终止序列
5.通过Socket套接字获取字节输入流,读取服务器发回来的上传成功
InputStream inputStream = socket.getInputStream();
len = inputStream.read(bytes);
System.out.println("服务器返回:"+new String(bytes,0,len));
6.关闭资源
socket.close();
/**
* 实现TCP图片上传客户端
* 实现步骤:
* 1.Socket套接字连接服务器,指定ip和端口
* Socket socket = Socket(String host, int port);
* 2.通过Socket获取字节输出流,写图片
* OutputStream os = socket.getOutputStream();
* 3.使用自己的流对象,读取图片数据源
* FileInputStream fis = new FileInputStream(filePath);
* 4.读取图片,使用字节输出流,将图片写到服务器,采用字节数组进行缓冲
* int len = 0;
* byte[] bytes = new byte[1024];
* while ((len = fis.read(bytes)) != -1){
* os.write(bytes,0,len);
* }
* 5.通过Socket套接字获取字节输入流,读取服务器发回来的上传成功
* InputStream inputStream = socket.getInputStream();
* len = inputStream.read(bytes);
* System.out.println("服务器返回:"+new String(bytes,0,len));
* 6.关闭资源
* socket.close();
*
* Created by Autumn on 2018/2/5.
*/
public class TCPClient {
public static void main(String[] args) throws IOException {
String ip = "127.0.0.1";
int port = 8000;
File fileFolder = new File("D:\\Users\\Autumn\\Pictures"); uploadPic(ip,port,fileFolder+File.separator+"tiger.jpg");
uploadPic(ip,port,fileFolder+File.separator+"water.jpg");
uploadPic(ip,port,fileFolder+File.separator+"sunset.jpg");
} /**
* 上传图片
* @param ip 服务器ip地址
* @param port 服务器端口号
* @param filePath 文件路径
* @throws IOException
*/
public static void uploadPic(String ip,int port,String filePath) throws IOException{
//创建客户端Socket
Socket socket = new Socket(ip,port);
//根据Socket获取字节输出流,用此流将图片写到服务器
OutputStream os = socket.getOutputStream(); //创建字节输入流,读取本机上的数据源图片
FileInputStream fis = new FileInputStream(filePath); //开始读写字节数组,从输入流中读取到输出流
int len = 0;
byte[] bytes = new byte[1024];
while ((len = fis.read(bytes)) != -1){
os.write(bytes,0,len);
} //文件读完时给服务器写终止序列
socket.shutdownOutput(); //获取字节输入流,读取服务器的上传成功
InputStream inputStream = socket.getInputStream();
len = inputStream.read(bytes);
System.out.println("服务器返回:"+new String(bytes,0,len)); socket.close();
}
}
TCP图片上传服务器端
1.ServerSocket套接字对象,监听8000
ServerSocket serverSocket = ServerSocket(int port);
2.方法accept()获取客户端的连接对象
Socket socket = serverSocket.accept();
3.客户端连接对象获取字节输入流,读取客户端发送图片
InputStream in = socket.getInputStream();
4.创建File对象,绑定上传文件夹。判断文件夹存在,不存在则创建文件夹
File upload = new File("d:\\upload");
if (!upload.exists()){
upload.mkdirs();
}
5.创建字节输出流,数据目的File对象所在文件夹
String fileName = "pic"+System.currentTimeMillis()+ new Random().nextInt(9999)+".jpg";
FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);
6.字节流读取图片,字节流将图片写入到目的文件中
byte[] bytes = new byte[1024];
int len = 0;
while((len = in.read(bytes))!=-1){ //读的是客户端发过来图片的字节数组,只有读文件能读到-1,所以这里永远读不到-1,read()会一直阻塞。(需要客户端发送结束标志)
fos.write(bytes,0,len);
}
7.将上传成功回写给客户端
socket.getOutputStream().write(("上传到服务器"+socket.getLocalAddress().toString()+"成功").getBytes());
8.关闭资源
fos.close();
socket.close();
/**
* 多线程接收图片
* Created by Autumn on 2018/2/5.
*/
public class TCPThreadServer {
public static void main(String[] args) throws IOException {
//服务端不用指定ip地址,只需指定端口号
ServerSocket serverSocket = new ServerSocket(8000);
while(true){
//获得一个客户端Socket对象,开启一个线程
Socket socket = serverSocket.accept(); //线程阻塞
new Thread(new Upload(socket)).start();
}
}
} /**
* TCP图片上传服务器
* 1.ServerSocket套接字对象,监听8000
* ServerSocket serverSocket = ServerSocket(int port);
* 2.方法accept()获取客户端的连接对象
* Socket socket = serverSocket.accept();
* 3.客户端连接对象获取字节输入流,读取客户端发送图片
* InputStream in = socket.getInputStream();
* 4.创建File对象,绑定上传文件夹。判断文件夹存在,不存在则创建文件夹
* File upload = new File("d:\\upload");
* if (!upload.exists()){
* upload.mkdirs();
* }
* 5.创建字节输出流,数据目的File对象所在文件夹
* String fileName = "pic"+System.currentTimeMillis()+ new Random().nextInt(9999)+".jpg";
* FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);
* 6.字节流读取图片,字节流将图片写入到目的文件中
* byte[] bytes = new byte[1024];
* int len = 0;
* while((len = in.read(bytes))!=-1){ //读的是客户端发过来图片的字节数组,只有读文件能读到1,所以永远读不到-1
* fos.write(bytes,0,len);
* }
* 7.将上传成功回写给客户端
* socket.getOutputStream().write(("上传到服务器"+socket.getLocalAddress().toString()+"成功").getBytes());
* 8.关闭资源
* fos.close();
* socket.close();
* Created by Autumn on 2018/2/5.
*/
public class Upload implements Runnable {
private Socket socket; public Upload(Socket socket){
this.socket = socket;
}
@Override
public void run() {
try {
//获取输入流
InputStream in = socket.getInputStream();
//创建文件夹
File upload = new File("d:\\upload");
if (!upload.exists()){
upload.mkdirs();
}
String fileName = "pic"+System.currentTimeMillis()+ new Random().nextInt(9999)+".jpg";
//创建字节输出流,将图片写入到目的文件夹 upload:d://upload
FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);
//读写字节数组
byte[] bytes = new byte[1024];
int len = 0;
while((len = in.read(bytes))!=-1){ //读的是客户端发过来图片的字节数组,只有读文件能读到1,所以永远读不到-1
fos.write(bytes,0,len);
}
System.out.println("成功接收来自"+socket.getInetAddress()+socket.getPort()+"的图片!");
//通过客户端连接对象获取字节输出流
//上传成功写会客户端
socket.getOutputStream().write(("上传到服务器"+socket.getLocalAddress().toString()+"成功").getBytes());
fos.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}