HttpClient文件上传-优快云博客

本文链接：https://blog.youkuaiyun.com/definite_things/article/details/15340963

本文介绍了如何使用HttpComponents HttpClient 4.3.1版本进行文件上传。由于网络上很多示例代码版本较旧，此文章提供了一个及时更新的实现方法。

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HttpComponents是一个HTTP工具集，其中HttpClient包括了HTTP客户端的API，可以充当浏览器。

用HttpClient API 实现文件上传的代码网上有很多，但是都更新不及时，版本较低。

以下代码的HttpClient版本是4.3.1：

    CloseableHttpClient httpclient = HttpClientBuilder.create().build();
    CloseableHttpResponse response = null;
    try {
        HttpPost httppost = new HttpPost(UPLOAD_URL);

        HttpEntity req = MultipartEntityBuilder.create()
        		.setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
        		.addPart("files", new FileBody(new File(FILE1_PATH)))
        		.addPart("files", new FileBody(new File(FILE2_PATH)))
        		.build();
        httppost.setEntity(req);

        System.out.println("executing request: " + httppost.getRequestLine());
        response = httpclient.execute(httppost);
        
        HttpEntity re = response.getEntity();
        System.out.println(response.getStatusLine());
        if (re != null) {
            System.out.println("Response content: " + 
            		new BufferedReader(new InputStreamReader(re.getContent())).readLine());
        }
        EntityUtils.consume(re);
    } finally {
        try {
        	response.close();
        } catch (Exception e) {
        	e.printStackTrace();
        }
    }

代码的依赖包：

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<version>4.3.1</version>
</dependency>
<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpmime</artifactId>
	<version>4.3.1</version>
</dependency>
<dependency>
	<groupId>log4j</groupId>
	<artifactId>log4j</artifactId>
	<version>1.2.17</version>
</dependency>