JAVA 实现 Http Client 的小demo

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#JAVA #Socket #Http

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本文展示了如何使用JAVA通过Socket实现一个简单的HTTP客户端，发送GET请求到www.baidu.com并接收响应。请求头包含了Host、User-Agent等信息，客户端保持连接并打印了服务器返回的HTML内容。

package http;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class HttpClientMy {

    private Socket socket = null;

    public HttpClientMy createSocket() {
        try {
            socket = new Socket("www.baidu.com", 80);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return this;
    }

    public HttpClientMy communciate() {
        StringBuffer requestBuilder = new StringBuffer("GET / HTTP/1.1\r\n");
        requestBuilder.append("Host: www.baidu.com\r\n");
        requestBuilder.append("User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0\r\n");
        requestBuilder.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n");
        requestBuilder.append("Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3");
        requestBuilder.append("Accept-Encoding: \r\n");
        requestBuilder.append("Connection: keep-alive\r\n");
        requestBuilder.append("Upgrade-Insecure-Requests: 1\r\n");
        requestBuilder.append("\r\n");

        System.out.println(requestBuilder.toString());

        try{
            OutputStream out = socket.getOutputStream();
            out.write(requestBuilder.toString().getBytes());
            InputStream in = socket.getInputStream();
            ByteArrayOutputStream response = new ByteArrayOutputStream();
            byte[] block = new byte[1024];
            while (in.read(block) != -1) {
                response.write(block);
            }
            System.out.println(new String(response.toByteArray()));
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return this;
    }

    public static void main(String[] args) {
        HttpClientMy client = new HttpClientMy().createSocket().communciate();
    }
}