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在 Java 中,可以使用 Apache HttpClient 库来实现 form-data 形式的文件上传。下面是一个简单的示例代码:
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.File;
import java.io.IOException;
public class FileUploader {public static void main(String[] args) throws IOException {// 创建 HttpClient 对象
CloseableHttpClient httpClient = HttpClients.createDefault();
// 创建 HttpPost 对象,并设置 URL
HttpPost httpPost = new HttpPost("http://example.com/upload");
// 创建 MultipartEntityBuilder 对象,并设置文件和其他参数
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addBinaryBody("file", new File("path/to/file"), ContentType.MULTIPART_FORM_DATA, "filename");
builder.addTextBody("param1", "value1");
builder.addTextBody("param2", "value2");
// 将 MultipartEntityBuilder 构建的实体对象设置到 HttpPost 对象中
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
// 执行 HttpPost 请求,获取响应
HttpResponse response = httpClient.execute(httpPost);
// 解析响应
HttpEntity responseEntity = response.getEntity();
String responseBody = EntityUtils.toString(responseEntity);
System.out.println(responseBody);
// 关闭 HttpClient
httpClient.close();}
}
上面的示例代码中,使用 MultipartEntityBuilder
创建一个 multipart/form-data 实体,通过 addBinaryBody
添加文件参数,通过 addTextBody
添加其他参数。然后将该实体设置到 HttpPost
对象中,最后使用 HttpClient
执行请求并获取响应。请根据实际情况修改 URL、文件路径和参数名。
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