The integrated guide of the HTTP Client framework and the proxy server in the Java class library
The integrated guide of the HTTP Client framework and the proxy server in the Java class library
Introduction:
When using Java for network programming, integration with the agency server is often an important demand.The proxy server acts as a middleman between the client and the Internet server, which is used to forward the network request and response.This guide will guide you to integrate steps with the agency server through the HTTP Client framework in the Java class library, and provide Java code example to help you better understand.
Step 1: Create an HTTP Client instance
Using the HTTP Client framework in the Java Library, we first need to create an HTTP Client instance.The following is an example code:
import java.net.http.HttpClient;
public class Main {
public static void main(String[] args) {
HttpClient httpClient = HttpClient.newHttpClient();
// Create a default http client example here
// You can also make a custom configuration as needed
}
}
Step 2: Configure the proxy server
The next step is to configure the HTTP Client instance to use the proxy server.You can complete this operation by specifying the host and port number of the proxy server.The following is an example code:
import java.net.Proxy;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
public class Main {
public static void main(String[] args) {
// Configure the proxy server
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy.example.com", 8080));
// Create an HTTP Client instance and configure the proxy server
HttpClient httpClient = HttpClient.newBuilder()
.proxy(proxy)
.build();
// Create HTTP request
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("http://www.example.com"))
.build();
// Send HTTP request
try {
HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
} catch (Exception e) {
e.printStackTrace();
}
}
}
Step 3: Authentication proxy server (if necessary)
If the proxy server requires authentication, it needs to provide the user name and password of the proxy server when configuring the HTTP Client instance.The following is an example code:
import java.net.Authenticator;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
public class Main {
public static void main(String[] args) {
// Configure the proxy server
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy.example.com", 8080));
// Configure the identity verification of the proxy server
Authenticator authenticator = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username", "password".toCharArray());
}
};
Authenticator.setDefault(authenticator);
// Create an HTTP Client instance and configure the proxy server
HttpClient httpClient = HttpClient.newBuilder()
.proxy(proxy)
.build();
// Create HTTP request
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("http://www.example.com"))
.build();
// Send HTTP request
try {
HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
} catch (Exception e) {
e.printStackTrace();
}
}
}
Summarize:
Through this guide, you have learned how to integrate with the proxy server in the HTTP Client framework in the Java library.You have learned the steps of creating an HTTP Client instance, configuration proxy server, and certification proxy server, and deepen your understanding through the Java code example.With these steps and sample code, you can easily achieve integration with the proxy server in the Java application.
