使用PHP 透過Java 的HttpClient 上傳檔案

在嘗試利用PHP 將檔案從Java 上傳到Apache 伺服器時，利用Jakarta 建立了一個JavaJava 應用程式HttpClient 函式庫版本4.0 beta2。然而，PHP 腳本無法識別上傳的文件，導致 $_FILES 數組為空。

Java 實作

最初的 Java 程式碼不正確，從下面的修改版本可以看出：

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();
  }
}

主要差異在於使用了 MultipartEntity，它可以正確處理檔案上傳。

PHP 腳本

PHP 腳本不變：

結論

透過在Java程式碼中使用MultipartEntity，解決了PHP腳本無法偵測到上傳檔案的問題，並且可以成功在伺服器上傳輸和處理檔案.