尽管请求和响应成功，但为什么我的 Java HttpClient 文件上传到 PHP 却失败？

使用 Java HttpClient 和 PHP 上传文件

在此场景中，您尝试使用 Java 和 PHP 将文件上传到 Apache HttpClient 库版本 4.0 beta2。然而，尽管请求和响应看似成功，is_uploaded_file 方法返回 false，并且 $_FILES 变量仍然为空。

原因

原始 Java 代码不正确。要纠正此问题，请使用以下更新的类：

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;

public class PostFile {
  public static void main(String[] args) throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

    HttpPost httppost = new HttpPost("http://localhost:9001/upload.php");
    File file = new File("c:/TRASH/zaba_1.jpg");

    MultipartEntity mpEntity = new MultipartEntity();
    ContentBody cbFile = new FileBody(file, "image/jpeg");
    mpEntity.addPart("userfile", cbFile);

    httppost.setEntity(mpEntity);
    System.out.println("executing request " + httppost.getRequestLine());
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity resEntity = response.getEntity();

    System.out.println(response.getStatusLine());
    if (resEntity != null) {
      System.out.println(EntityUtils.toString(resEntity));
    }
    if (resEntity != null) {
      resEntity.consumeContent();
    }

    httpclient.getConnectionManager().shutdown();
  }
}

主要区别是 MultipartEntity 的使用。原来的实现缺少这个必备组件，导致PHP脚本无法识别上传的文件。

以上是尽管请求和响应成功，但为什么我的 Java HttpClient 文件上传到 PHP 却失败？的详细内容。更多信息请关注PHP中文网其他相关文章！