Java Socket getOutputStream() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 getOutputStream() 方法返回给定套接字的输出流。如果关闭返回的 OutputStream，它将关闭关联的套接字。

语法

参数

不适用

getOutputStream() 返回一个输出流，用于将字节写入此套接字。

抛出

IOException - 如果在创建输出流时发生 I/O 错误，或者套接字未连接。

示例 1

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample1  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //connect() method connects the specified socket to the server
        socket.connect(socketAddress);
        //getOutputStream() returns an output stream for writing bytes to this socket.
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

输出

Output Stream: java.io.DataOutputStream@1540e19d

示例 2

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //connect() method connects the specified socket to the server
        socket.connect(socketAddress);
        //closing the socket
        socket.close();
        //getOutputStream() returns an output stream for writing bytes to this socket.
        //An Input/Output error occurs as this socket is closed
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

输出

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.getOutputStream(Socket.java:943)
	at com.tpointtech.JavaSocketGetOutputStreamExample2.main(JavaSocketGetOutputStreamExample2.java:22)

示例 3

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample3  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //getOutputStream() returns an output stream for writing bytes to this socket.
        //An Input/Output error occurs as this socket is not connected
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

输出

Exception in thread "main" java.net.SocketException: Socket is not connected
	at java.net.Socket.getOutputStream(Socket.java:945)
	at com.tpointtech.JavaSocketGetOutputStreamExample3.main(JavaSocketGetOutputStreamExample3.java:20)

下一主题Java Socket 类

Java Socket getOutputStream() 方法

语法

参数

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抛出

示例 1

示例 2

示例 3

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Java Socket getOutputStream() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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