Python 官方文档：入门教程 => 点击学习
目录Socket使用getInputStream()阻塞用线程解决Socket的getInputStream阻塞1.背景2.问题3.原因4.解决办法5.Socket通信注意事项soc
今天用socket进行编程练习时，发现程序到了getInputStream(）这里就进行不下去了
Socket socket = new Socket("127.0.0.1", 800);
ObjectInputStream reader = new ObjectInputStream(socket.getInputStream());
System.out.println("a");
ObjectOutputStream writer = new ObjectOutputStream(socket.getOutputStream());就这样的一个测试代码，a不会打印出来
后来发现是getInputStream(）会一直阻塞在那里阻塞
我把两行代码调了一下就好了，还不太清楚原因，先记下来
Socket socket = new Socket("127.0.0.1", 800);
ObjectOutputStream writer = new ObjectOutputStream(socket.getOutputStream());
System.out.println("a");
ObjectInputStream reader = new ObjectInputStream(socket.getInputStream());在Socket通信中，当我们希望传输对象时，往往会用到输入/输出对象流。
ObjectInputStream in=new ObjectInputStream(socket.getInputStream());
ObjectOutputStream out=new ObjectOutputStream(socket.getOutputStream());
当程序调用socket.getInputStream()程序被被卡住。
socket.getInputStream()方法会导致程序阻塞，直到inputStream收到对方发过来的报文消息，程序才会继续往下执行。
public ObjectInputStream(InputStream in) throws ioException的官方api显示：
Creates an ObjectInputStream that reads from the specified InputStream. A serialization stream header is read from the stream and verified. This constructor will block until the corresponding ObjectOutputStream has written and flushed the header. [1]
用线程的方式处理输入流。以下为示例代码：
//===============客户端代码 SocketClient.java=====================
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
public class SocketClient {
private Socket socket;
private ObjectOutputStream out;
private ObjectInputStream in;
public SocketClient(){
try {
socket=new Socket("localhost",8081);
out=new ObjectOutputStream(socket.getOutputStream());
ReadThread readThread=new ReadThread();
readThread.start();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void sendMessage(String msg){
System.out.println("send message:"+msg);
try {
out.writeObject(msg);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
class ReadThread extends Thread{
boolean runFlag=true;
public void run(){
try {
in=new ObjectInputStream(socket.getInputStream());
} catch (IOException e1) {
e1.printStackTrace();
}
while(runFlag){
if(socket.isClosed()){
return;
}
try {
Object obj=in.readObject();
if(obj instanceof String){
System.out.println("Client recive:"+obj);
}
}
catch (IOException e) {
e.printStackTrace();
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
public void exit(){
runFlag=false;
}
}
public static void main(String[] args) {
SocketClient socketClient=new SocketClient();
System.out.println("build socketClient");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
socketClient.sendMessage("Hello first.");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
socketClient.sendMessage("Hello second.");
}
}//============服务器端代码 SocketService.java===========
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.Date;
public class SocketService {
ServerSocket serverSocket;
public SocketService(){
try {
serverSocket=new ServerSocket(8081);
while(true){
Socket socket=serverSocket.accept();
SocketServiceThread sst=new SocketServiceThread(socket);
sst.start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
class SocketServiceThread extends Thread{
Socket socket;
ObjectInputStream in;
ObjectOutputStream out;
boolean runFlag=true;
public SocketServiceThread(Socket socket){
if(null==socket){
runFlag=false;
return;
}
this.socket=socket;
try {
out=new ObjectOutputStream(socket.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
public void run(){
if(null==socket){
System.out.println("socket is null");
return;
}
try {
in=new ObjectInputStream(socket.getInputStream());
while(runFlag){
if(socket.isClosed()){
System.out.println("socket is closed");
return;
}
try {
String obj=(String)in.readObject();
if(obj instanceof String){
System.out.println("Server recive:"+obj);
Date date=new Date();
out.writeObject("["+date+"]"+obj);
out.flush();
}
else{
System.out.println("Server recive:"+obj);
}
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
catch (SocketException e){
e.printStackTrace();
return;
}
catch (IOException e){
e.printStackTrace();
}
}
} catch (IOException e1) {
e1.printStackTrace();
return;
} catch (Exception e){
return;
}
}
public void exit(){
runFlag=false;
}
}
public static void main(String[] args) {
System.out.println("===============start service===============");
new SocketService();
}
}（1）.writeXXX()方法后一般用flush()来把缓存内容发送出去。
（2）.发送对象时，对象必须串行化，即该对象需要实现Serializable接口。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
--结束END--
本文标题: 解决Java中socket使用getInputStream()阻塞问题
本文链接: https://www.lsjlt.com/news/159789.html(转载时请注明来源链接)
有问题或投稿请发送至: 邮箱/279061341@qq.com QQ/279061341
下载Word文档到电脑，方便收藏和打印～
2024-03-01
2024-03-01
2024-03-01
2024-02-29
2024-02-29
2024-02-29
2024-02-29
2024-02-29
2024-02-29
2024-02-29
回答
回答
回答
回答
回答
回答
回答
回答
回答
回答
官方手机版
微信公众号
商务合作
0