使用 POST 从 Java 发送文件

Question

我正在尝试使用 java 发送文件，我有一个正在运行的现有 python，需要转换为 java。

下面是我的python代码，

with io.open('test.text', 'rb') as f:
r = requests.request("POST",'http://my_url/post', data=f)

我的java代码

HttpURLConnection httpUrlConnection = null;
URL url = new URL("http://my_url/post");
httpUrlConnection = (HttpURLConnection) url.openConnection();
httpUrlConnection.setRequestMethod("POST");

现在我不确定如何将文件传递给发布请求

Answer 1

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.entity.FileEntity;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.impl.nio.client.HttpAsyncClients;

import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;

public class PostFile {
    public static void main(String[] aaa) throws URISyntaxException{
        final URI uri = new URIBuilder("http://httpbin.org/post")
                .build();
        HttpPost request = new HttpPost(uri);

        File f = new File("file.txt");
        request.setEntity(new FileEntity(f));

        CloseableHttpAsyncClient client = HttpAsyncClients.custom().build();
        client.start();
        client.execute(request, new FutureCallback<HttpResponse>() {

            @Override
            public void completed(HttpResponse httpResponse) {
                System.out.println("completed: " + httpResponse);
            }

            @Override
            public void failed(Exception e) {
                System.out.println("failed");
            }

            @Override
            public void cancelled() {
                System.out.println("cancelled");
            }
        });
    }
}

试试这个