Detailed explanation of code implementation for Socket setting connection timeout in Java

In our daily connections, if the timeout is too long, it will affect the test during development. The following article mainly shares with you the code for setting the connection timeout for Socket in Java. Friends who need it can refer to it. Below Let’s take a look together.

Preface

Everyone knows that if Java’s Socket cannot connect to the host with the specified IP and Port, it will throw IO Exception Exception, and usually, there will be an indefinite period of time from the connection to the occurrence of IOException, which is the so-called timeout period. If the timeout period is too long, it will affect the test during development. If the code becomes a product, it will It greatly affects the user experience, so how to set this duration? Let’s take a look at the detailed introduction:

The Socket class provides a method:

public void connect(SocketAddress endpoint, int timeout) 
    throws IOException

Parameters:

• endpoint – SocketAddress providing host IP and Port

• timeout – Timeout value to use (in milliseconds).

This method is used to connect the Socket to the specified server and set a timeout value. When the timeout value is set to greater than 0, when the timeout occurs, an exception will be thrown and the connection will be stopped. Setting the timeout value to 0 will timeout infinitely.

Therefore, you can set the timeout period of the Socket connection using the above method. The code is as follows:

// 设置ip和prot
String ip = "127.0.0.1";
int port = 8888;
// 创建Socket
Socket client = new Socket();
// 设置发送地址
SocketAddress addr = new InetSocketAddress(ip, port);
// 超时1秒，并连接服务器
client.connect(addr, 1000);

Explain the above SocketAddress and InetSocketAddress. These two classes are used to create the Socket connection address. The former is an

abstract class, and the latter is a subclass of the former. The address is created through the constructor method:

public InetSocketAddress(String hostname, int port)

Parameters:

• hostname – hostname, can also be ip

• port – port number

Also , InetSocketAddress also provides some network-related methods, such as the commonly used method of obtaining the local IP:

public final InetAddress getAddress()

This method will return an InetAddress, and then obtain the IP through the InetAddress method, as follows:

public String getHostAddress()

Then the code to obtain the local IP is:

// client就是上面创建的Socket
String host_ip = client.getAddress().getHostAddress();

So, let’s stop here!

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