httpclient post 穿文件

使用HttpClient进行POST请求并上传文件的方法如下：

1. 导入HttpClient库，创建HttpClient对象和HttpPost对象。
2. 创建MultipartEntityBuilder对象，并设置字符编码为UTF-8。
3. 添加普通参数和文件参数到MultipartEntityBuilder对象中。
4. 创建HttpEntity对象，并将MultipartEntityBuilder对象的内容添加到其中。
5. 将HttpEntity对象设置为HttpPost对象的实体。
6. 执行HttpPost请求，并获取响应。

以下是一个示例代码：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class HttpClientExample {
    public static void main(String[] args) throws IOException {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost("http://example.com/upload");

        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setCharset(StandardCharsets.UTF_8);
        
        // 添加普通参数
        builder.addPart("param1", new StringBody("张三", ContentType.TEXT_PLAIN));

        // 添加文件参数
        File file1 = new File("file1.txt");
        builder.addPart("file1", new FileBody(file1, ContentType.DEFAULT_BINARY));

        HttpEntity entity = builder.build();
        httpPost.setEntity(entity);

        HttpResponse response = httpClient.execute(httpPost);
        // 处理响应
    }
}

在以上代码中，我们首先导入所需的类和库。然后，创建HttpClient和HttpPost对象。接下来，使用MultipartEntityBuilder创建一个包含普通参数和文件参数的实体。最后，将实体设置为HttpPost对象的实体，并执行请求。

请注意，需要根据实际情况修改URL和文件路径。此外，还需要处理响应以及异常情况。

以上就是使用HttpClient进行POST请求并上传文件的方法。希望对你有帮助！<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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