java - Apache HttpClient API中的CloseableHttpClient和HttpClient有什么区别？

我正在研究由我们公司开发的应用程序。它使用Apache HttpClient库。在源代码中，它使用HttpClient类创建实例以连接到服务器。

我想了解Apache HttpClient，并且已经过了this set of examples。所有示例都使用CloseableHttpClient而不是HttpClient。所以我认为CloseableHttpClient是HttpClient的扩展版本。如果是这种情况，我有两个问题:

两者之间有什么区别？

建议对我的新开发使用哪个类？

最佳答案

HttpClient API的主要入口点是HttpClient接口(interface)。

HttpClient的最基本功能是执行HTTP方法。

HTTP方法的执行涉及一个或多个HTTP请求/HTTP响应交换，通常由HttpClient在内部处理。

CloseableHttpClient是一个抽象类，它是HttpClient的基础实现，它也实现java.io.Closeable。

以下是最简单形式的请求执行过程示例:

CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpget = new HttpGet("http://localhost/");
CloseableHttpResponse response = httpclient.execute(httpget);
try {
    //do something
} finally {
    response.close();
}

---

• HttpClient resource deallocation: When an instance CloseableHttpClient is no longer needed and is about to go out of scope the connection manager associated with it must be shut down by calling the CloseableHttpClient#close() method.

  CloseableHttpClient httpclient = HttpClients.createDefault();
  try {
      //do something
  } finally {
      httpclient.close();
  }

see the Reference to learn fundamentals.

---

@ScadgeSince Java 7, Use of try-with-resources statement ensures that each resource is closed at the end of the statement. It can be used both for the client and for each response

try(CloseableHttpClient httpclient = HttpClients.createDefault()){

    // e.g. do this many times
    try (CloseableHttpResponse response = httpclient.execute(httpget)) {
    //do something
    }

    //do something else with httpclient here
}

关于java - Apache HttpClient API中的CloseableHttpClient和HttpClient有什么区别？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21574478/