已弃用的 Java HttpClient - 有多难? [英] Deprecated Java HttpClient - How hard can it be?

问题描述

我要做的就是下载一些 JSON 并将其反序列化为一个对象.我还没有下载 JSON.

All I'm trying to do is download some JSON and deserialize it into an object. I haven't got as far as downloading the JSON yet.

我能找到的几乎每一个 HttpClient 示例，包括 apache 站点上的那些看起来像......

Almost every single HttpClient example I can find, including those on the apache site looks something like...

import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultHttpClient;

public void blah() {
    HttpClient client = new DefaultHttpClient();
    ...
}

但是，Netbeans 告诉我 DefaultHttpClient 已被弃用.我已经尝试在谷歌上搜索 DefaultHttpClient deprecated 以及我能想到的尽可能多的其他变体，但找不到任何有用的结果，所以我显然遗漏了一些东西.

However, Netbeans tells me that DefaultHttpClient is deprecated. I've tried googling for DefaultHttpClient deprecated and as many other variations as I can think of and can't find any useful results, so I'm obviously missing something.

Java7 下载网页内容的正确方法是什么?作为语言的一部分，真的没有像样的 Http Client 吗?我觉得这很难相信.

What is the correct Java7 way to download the contents of a webpage? Is there really no decent Http Client as part of the language? I find that hard to believe.

我对此的 Maven 依赖是...

My Maven dependency for this is...

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>LATEST</version>
    <type>jar</type>
</dependency>

推荐答案

相关导入:

import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.IOException;

用法:

HttpClient httpClient = HttpClientBuilder.create().build();

编辑(根据朱尔斯的建议):

EDIT (after Jules' suggestion):

由于 build() 方法返回一个 CloseableHttpClient is-a AutoClosable，您可以将try-with-resources 语句中的声明(Java 7+):

As the build() method returns a CloseableHttpClient which is-a AutoClosable, you can place the declaration in a try-with-resources statement (Java 7+):

try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {

    // use httpClient (no need to close it explicitly)

} catch (IOException e) {

    // handle

}

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