JAVA模拟表单上传遇到问题

RT，我想向GOOGLE识图 上传一张图片并得到传回的地址，但是执行后，我得到回传的地址在浏览器打开，提示：无法按图搜索。
PS:我用Fiddler模拟提交了一次，是可以的,Fiddler的截图如下。 JAVA代码附在后边。还请指教，谢谢！

---

public class test {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    postFile();

}


private static void postFile() {  
    HttpClient httpClient = new DefaultHttpClient();  
    HttpPost httpPost = new HttpPost("http://www.google.com.tw/searchbyimage/upload");  

    try {  

        // 需要上传的文件  
        String root = "C:/";  
        String fileName = "AA.jpg";  
        File uploadFile = new File(root+fileName);  
        //定义FileEntity对象  
        HttpEntity entity = new FileEntity(uploadFile, "image/jpeg");



        httpPost.setHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36");
        String BOUNDARY = "----------" + System.currentTimeMillis();
        httpPost.setHeader("Content-Type", "multipart/form-data; boundary="
                + BOUNDARY);

        httpPost.setEntity(entity); //设置实体对象  

        // httpClient执行httpPost提交  
        HttpResponse response = httpClient.execute(httpPost);  
        // 得到服务器响应实体对象  
        HttpEntity responseEntity = response.getEntity();  
        if (responseEntity != null) {  
            System.out.println(EntityUtils.toString(responseEntity, "utf-8"));  
            System.out.println("文件 "+fileName+"上传成功！");  
        } else {  
            System.out.println("服务器无响应！");  
        }  
    } catch (Exception e) {  
        e.printStackTrace();  
    } finally {  
        // 释放资源  
        httpClient.getConnectionManager().shutdown();  
    }  
}  

}

---

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);

FileBody bin = new FileBody(new File(fileName));
StringBody comment = new StringBody("Filename: " + fileName);

MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("bin", bin);
reqEntity.addPart("comment", comment);
httppost.setEntity(reqEntity);

HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();

How can I make a multipart/form-data POST request using Java?