代理服务器实现

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhoujiaping123/article/details/83036311

基于apache的httpclient实现。

配置依赖

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
		</dependency>
		<dependency>
	<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpmime</artifactId>
		</dependency>
		<dependency>
	<groupId>org.apache.httpcomponents</groupId>
			<artifactId>fluent-hc</artifactId>
		</dependency>
		```
MyHttpProxyTest.java

/**

• http代理demo
  */
  public class MyHttpProxyTest {
  private static Logger logger = LoggerFactory.getLogger(MyHttpProxyTest.class);

  /**

  • 所有通过httpclient对象发送的请求，实际上都发送给代理。
    */
    public static void main(String[] args)throws IOException {
    // 创建客户端
    // 设置代理IP、端口、协议（请分别替换）
    HttpHost proxy = new HttpHost(“localhost”, 8081, “http”);
    // 把代理设置到请求配置
    RequestConfig defaultRequestConfig = RequestConfig.custom().setProxy(proxy).build();

    // 实例化CloseableHttpClient对象
    CloseableHttpClient httpclient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();
    // 创建服务端
    ServerBootstrap bs = ServerBootstrap.bootstrap().setListenerPort(8080);
    bs.registerHandler("/*", new HttpRequestHandler() {
    @Override
    public void handle(HttpRequest request, HttpResponse response, HttpContext context)
    throws HttpException, IOException {
    logger.info(“请求=>{}”, request);
    CloseableHttpResponse resp = httpclient.execute(proxy, request);
    logger.info(“响应=>{}”, resp);
    response.setStatusLine(resp.getStatusLine());
    response.setHeaders(resp.getAllHeaders());
    response.setEntity(resp.getEntity());
    response.removeHeaders(HTTP.TRANSFER_ENCODING);// 不允许手动设置该响应头
    response.removeHeaders(HTTP.DATE_HEADER);
    response.removeHeaders(HTTP.CONTENT_LEN);// 不允许手动设置该响应头
    response.removeHeaders(HTTP.SERVER_HEADER);
    logger.info(“代理响应=>{}”, response);
    }
    });
    ExceptionLogger exceptionLogger = new ExceptionLogger() {
    @Override
    public void log(Exception ex) {
    logger.error("", ex);
    }
    };
    bs.setExceptionLogger(exceptionLogger);// 默认吞并异常
    HttpServer server = bs.create();
    server.start();
    Runtime.getRuntime().addShutdownHook(new Thread() {
    @Override
    public void run() {
    server.shutdown(5, TimeUnit.SECONDS);
    }
    });
    }
    }

有什么用呢？
纯粹是为了玩。
了解apache httpcomponent实现http服务器，
了解apache httpcomponent实现http客户端，
了解代理服务器实现原理。