Core :: http client framework in the java class library

Core :: http client framework in the java class library Overview: In modern Internet applications, the HTTP client framework is a very common and important component.They are used to communicate with the server to transmit and receive data.When processing a large number of requests and responses, the performance is particularly critical.This article will introduce the performance optimization skills of Core :: HTTP client framework in some Java class libraries to help developers improve the performance of applications. 1. Choose the right HTTP client library There are multiple HTTP client libraries in the Java ecosystem to choose from, such as Apache HTTPClient, OKHTTP and HTTPURLCONNECTION.Understand the characteristics and performance characteristics of each library, and select the library that is best for your application needs.For applications that process high and sends requests, you can consider using asynchronous, non -blocking HTTP client libraries, such as OKHTTP and Apache HTTPASYNCClient to improve performance and throughput. 2. Use the connection pool Creating and destroying the HTTP connection is a very resource -consuming operation.By using the connection pool, connects that have been established can be reused, thereby reducing the creation and destruction operation of connection and improving performance.Both Apache Httpclient and Okhttp provide support from the connection pool.The following is an example code of the Apache httpClient connection pool: PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(); connectionManager.setmaxTotal (100); // maximum number of connections connectionManager.setdefaultMaxperroute (10); // The maximum number of connections of each routing CloseableHttpClient httpClient = HttpClientBuilder.create() .setConnectionManager(connectionManager) .build(); HttpGet httpGet = new HttpGet("http://example.com"); CloseableHttpResponse response = httpClient.execute(httpGet); // Treatment response httpClient.close(); 3. Open the lasting connection Using HTTP 1.1 Keep-alive (Keep-Alive) can reduce the number of connections to establish and close times, reduce the burden on the server, and improve performance.In Apache httpclient and HTTPURLCONNECTION, long -lasting connections have been opened by default.The following is a sample code that enables the lasting connection: URLConnection connection = new URL("http://example.com").openConnection(); connection.setRequestProperty("Connection", "Keep-Alive"); 4. Enable compression and cache Enable the HTTP compression function can reduce the size of the transmission data and speed up the response.In Apache httpclient and Okhttp, compression can be enabled by setting the access-Entiding head.For example, in Apache httpclient, you can use the following code to enable compression: HttpRequestInterceptor acceptEncodingInterceptor = new RequestAcceptEncoding(); httpClient.addRequestInterceptor(acceptEncodingInterceptor); In addition, using cache can avoid frequent requests, reduce the consumption of network bandwidth and the burden on the server.In HTTPURLCONNECTION, the cache configuration is used to use the Cache-Control and Expires fields at the head to make the cache configuration.The following is a simple example code: URLConnection connection = new URL("http://example.com").openConnection(); connection.setUseCaches(true); connection.addRequestProperty("Cache-Control", "max-age=60"); 5. Enable connection reuse In the high -concurrency scene, the reuse of the use of the HTTP connection can reduce the number of connections and destroy the number of connections and improve performance.In Apache httpclient, the connection pool can be used to achieve reuse of connection.The following is an example code: ConnectionKeepAliveStrategy keepAliveStrategy = new DefaultConnectionKeepAliveStrategy() { @Override public long getKeepAliveDuration(HttpResponse response, HttpContext context) { long keepAliveDuration = super.getKeepAliveDuration(response, context); if (keepAliveDuration == -1) { // Keep a long -lasting connection for 5 seconds by default keepAliveDuration = 5000; } return keepAliveDuration; } }; PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(); connectionManager.setKeepAliveStrategy(keepAliveStrategy); CloseableHttpClient httpClient = HttpClientBuilder.create() .setConnectionManager(connectionManager) .build(); in conclusion: By selecting the right HTTP client library, using the connection pool, opening the lasting connection, enabled compression and cache, enable connection reuse and other performance optimization techniques, it can effectively improve the performance of the Core :: HTTP client framework in the Java class library.The optimized HTTP client can handle a large number of requests and responses more efficiently to improve the performance and user experience of the application. (Note: The example code of this article is based on the version of Java 8 and Apache HttpClient 4.5.12. The use of different versions and libraries may be different, please adjust according to the actual situation.)