使用java创建HTTP multipart/form-data请求

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.impl.client.HttpClients;

import java.io.File;
import java.io.IOException;

public class MultipartFormDataExample {
    public static void main(String[] args) {
        HttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("http://example.com/upload");

        // 创建文件部分
        File file = new File("path/to/file");
        FileBody fileBody = new FileBody(file, ContentType.DEFAULT_BINARY);

        // 创建其他表单字段
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.addPart("file", fileBody);
        builder.addTextBody("name", "John Doe");

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

        try {
            HttpResponse response = httpClient.execute(httpPost);
            // 处理响应
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}