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IP地址:唯一标识主机,例如身份证号码
用于标定计算机上某个特定的网络程序
发送数据是一个拆包装包的过程
TCP协议:传输控制协议
三次握手:结束后就可以大量发送数据
三次握手:
“能听见我说话吗?”
“听见了!能听见我说话吗?”
“听见了!”
UDP :用户数据包协议
// 获取本机的主机号/ip地址
InetAddress localHost = InetAddress.getLocalHost();
System.out.println(localHost);
// 根据主机号获取连接
InetAddress byName = InetAddress.getByName("www.baidu.com");
System.out.println(byName);
客户端:
package socket;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.Socket;
public class TcpSocketClient{
public static void main(String[] args) throws Exception{
// 连接服务端
Socket socket = new Socket(InetAddress.getLocalHost(),8888);
InputStream inputStream = socket.getInputStream();
byte[] bytes = new byte[1024];
int byteSize = 0;
while ( (byteSize = inputStream.read(bytes)) !=-1){
System.out.println(new String(bytes,0,byteSize));
}
inputStream.close();
socket.close();
}
}
服务端:
public class TcpSocketServer {
public static void main(String[] args) throws IOException {
// 获取连接
ServerSocket serverSocket = new ServerSocket(8888);
System.out.println("服务端等待客户端连接中。。。。");
Socket socket = serverSocket.accept();
System.out.println("连接到客户端:"+socket.getClass());
// 传输数据
OutputStream outputStream = socket.getOutputStream();
outputStream.write("hello client!".getBytes());
// 关闭连接
outputStream.close();
socket.close();
}
}
将原有案例升级为:
服务端给客户端发送一条消息
客户端接收服务端一条消息,并且回复服务端
此操作必须在发送完消息之后,使用socket.shutdownOutputStream()
如果不加如下代码就会阻塞。因为服务器会一直等待客户端的输出。既然服务器阻塞了,客户端等待着服务器的输出,也会被阻塞,所以导致客户端和服务端都被阻塞。
调用Socket.shutdownOutput()方法后,客户端输出的数据都将被发送,并加上 TCP 的正常连接终止序列(-1,也就是服务端终止循环的判断条件),这样服务端读取数据时就不会被阻塞了。
@SuppressWarnings("all")
public class TcpSocketServer2 {
public static void main(String[] args) throws IOException {
// 获取连接
ServerSocket serverSocket = new ServerSocket(8888);
System.out.println("服务端等待客户端连接中。。。。");
Socket socket = serverSocket.accept();
System.out.println("连接到客户端:"+socket.getClass());
// 传输数据
OutputStream outputStream = socket.getOutputStream();
outputStream.write("hello client!".getBytes());
InputStream inputStream = socket.getInputStream();
int byteSize = 0;
byte[] bytes = new byte[1024];
while ( (byteSize=inputStream.read(bytes))!=-1 ){
System.out.println(new String(bytes,0,byteSize));
}
// 关闭连接
outputStream.close();
inputStream.close();
socket.close();
}
}
@SuppressWarnings("all")
public class TcpSocketClient2 {
public static void main(String[] args) throws Exception{
// 连接服务端
Socket socket = new Socket(InetAddress.getLocalHost(),8888);
InputStream inputStream = socket.getInputStream();
byte[] bytes = new byte[1024];
int byteSize = 0;
while ( (byteSize = inputStream.read(bytes)) !=-1){
System.out.println(new String(bytes,0,byteSize));
}
OutputStream outputStream = socket.getOutputStream();
outputStream.write("hello server".getBytes());
System.out.println(1);
inputStream.close();
outputStream.close();
socket.close();
}
}
服务端:
public class TcpSocketServer3 {
public static void main(String[] args) throws IOException {
// 获取连接
ServerSocket serverSocket = new ServerSocket(8888);
System.out.println("服务端等待客户端连接中。。。。");
Socket socket = serverSocket.accept();
System.out.println("连接到客户端:"+socket.getClass());
OutputStream outputStream = socket.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream));
bufferedWriter.write("hello cline");
bufferedWriter.newLine();
bufferedWriter.flush();
InputStream inputStream = socket.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String s = reader.readLine();
System.out.println(s);
// 关闭连接
bufferedWriter.close();
reader.close();
socket.close();
}
}
@SuppressWarnings("all")
public class TcpSocketClient3 {
public static void main(String[] args) throws Exception{
// 连接服务端
Socket socket = new Socket(InetAddress.getLocalHost(),8888);
InputStream inputStream = socket.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String s = reader.readLine();
System.out.println(s);
OutputStream outputStream = socket.getOutputStream();
BufferedWriter writer =new BufferedWriter(new OutputStreamWriter(outputStream));
writer.write("hello server");
writer.newLine();
writer.flush();
reader.close();
writer.close();
socket.close();
}
}
思路: 服务端通过FileInputStream读取图片文件,将其放入byte[]中,再通将byte[]通过socket.getOutPutStream()传入到客户端中
客户端通过socket.getInputStream()循环读取到字节数组,将其放入ByteArrayOutputStream()中,然后再通过bos.byBytes转换成字符数组放入磁盘中
服务端:
public class Server {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = new ServerSocket(8888);
Socket socket = serverSocket.accept();
String filePath = "C:\\Temp\\image\\1\\1-256-256-1.png";
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(filePath));
ByteArrayOutputStream bos =new ByteArrayOutputStream();
int len=0;
byte[] bytes = new byte[1024];
while ((len=bis.read(bytes))!=-1){
bos.write(bytes);
}
byte[] bytes1 = bos.toByteArray();
OutputStream outputStream = socket.getOutputStream();
outputStream.write(bytes1);
outputStream.close();
bos.close();
socket.close();
}
}
客户端:
public class Client {
public static void main(String[] args) throws IOException {
Socket socket = new Socket(InetAddress.getLocalHost(),8888);
InputStream inputStream = socket.getInputStream();
String filePath = "C:\\Temp\\image\\2\\1.png";
FileOutputStream fos = new FileOutputStream(filePath);
int len = 0;
byte[] bytes = new byte[1024];
while ( (len=(inputStream.read(bytes)))!=-1){
fos.write(bytes);
}
fos.close();
inputStream.close();
socket.close();
}
}
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