如何使用与PHP一起使用的Java HttpClient库上载文件

Question

我想编写Java应用程序，它将使用PHP将文件上传到Apache服务器。Java代码使用Jakarta HttpClient库版本4.0 beta2：

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.FileEntity;
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:9002/upload.php");
    File file = new File("c:/TRASH/zaba_1.jpg");

    FileEntity reqEntity = new FileEntity(file, "binary/octet-stream");

    httppost.setEntity(reqEntity);
    reqEntity.setContentType("binary/octet-stream");
    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();
  }
}

PHP文件upload.php非常简单：

<?php
if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
  echo "File ". $_FILES['userfile']['name'] ." uploaded successfully.\n";
  move_uploaded_file ($_FILES['userfile'] ['tmp_name'], $_FILES['userfile'] ['name']);
} else {
  echo "Possible file upload attack: ";
  echo "filename '". $_FILES['userfile']['tmp_name'] . "'.";
  print_r($_FILES);
}
?>

阅读响应，我得到以下结果：

executing request POST http://localhost:9002/upload.php HTTP/1.1



HTTP / 1.1 200 OK
可能的文件上传攻击：文件名“。
数组
（
）

这样请求就成功了，我可以与服务器通信了，但是PHP没有注意到文件-
is_uploaded_file返回的方法false和$_FILES变量为空。我不知道为什么会这样。我已经跟踪了HTTP响应和请求，它们看起来还不错：
请求是：

POST /upload.php HTTP / 1.1
内容长度：13091
内容类型：二进制/八位字节流
主机：localhost：9002
连接：保持活动
用户代理：Apache-HttpClient / 4.0-beta2（java 1.5）
期望：100-继续

˙Ř˙ŕ.....其余的二进制文件...

和回应：

HTTP / 1.1 100继续

HTTP / 1.1 200 OK
日期：2009年7月1日星期三06:51:57 GMT
服务器：Apache / 2.2.8（Win32）DAV / 2 mod_ssl / 2.2.8 OpenSSL / 0.9.8g mod_autoindex_color PHP / 5.2.5 mod_jk / 1.2.26
X-Powered-By：PHP / 5.2.5
内容长度：51
保持活动：超时= 5，最大= 100
连接：保持活动
内容类型：text / html

可能的文件上传攻击：文件名''.Array
（
）

我正在使用xampp的本地Windows XP和远程Linux服务器上对此进行测试。我还尝试使用HttpClient的早期版本-版本3.1-
is_uploaded_file返回的结果更加不清楚false，但是$_FILES数组中填充了正确的数据。

Answer 1

好的，我使用的Java代码是错误的，这里是正确的Java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();
  }
}

注意使用MultipartEntity。