Android文件传输如何验证

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
public class post {
//文件上传
//上传代码，第一个参数，为要使用的URL，第二个参数，为表单内容，第三个参数为要上传的文件，可以上传多个文件，这根据需要页定
public static String post(String actionUrl, Map<String, String> params,Map<String, File> files) throws IOException {
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(5 * 1000);
conn.setDoInput(true);// 允许输入
conn.setDoOutput(true);// 允许输出
conn.setUseCaches(false);
conn.setRequestMethod("POST"); //Post方式
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA+ ";boundary=" + BOUNDARY);

// 首先组拼文本类型的参数
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}

DataOutputStream outStream = new DataOutputStream(conn .getOutputStream());
outStream.write(sb.toString().getBytes());
// 发送文件数据
if (files != null)
for (Map.Entry<String, File> file : files.entrySet()) {
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\""
+ file.getKey() + "\"" + LINEND);
sb1.append("Content-Type: application/octet-stream; charset="
+ CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());
InputStream is = new FileInputStream(file.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
is.close();
outStream.write(LINEND.getBytes());
}
// 请求结束标志
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到响应码
int res = conn.getResponseCode();
InputStream in = conn.getInputStream();
InputStreamReader isReader = new InputStreamReader(in);
BufferedReader bufReader = new BufferedReader(isReader);
String line = null;
String data = "OK";
while((line = bufReader.readLine())==null)
data += line;
if (res == 200) {
int ch;
StringBuilder sb2 = new StringBuilder();
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
outStream.close();
conn.disconnect();
return in.toString();
}

}

以上是我从网上找的代码，是用于传输文件的。我想自己在程序里验证一下，具体如下：
String name=URLEncoder.encode("upload","utf-8");

Map<String, String> params = new HashMap<String, String>();

params.put("NAME", name);

Map<String, File> files = new HashMap<String, File>();

files.put("upload.txt", new File("/sdcard/upload.txt"));

post.post("http://192.168.1.6:8080/videoweb/video/manage.do", params, files);

但是我不知道第一个参数里的URL地址如何填写，也不知道如何验证文件是否上传成功。特此求助，希望能得到具体一点的回复，因为我是个刚接触android的菜鸟。分数不多了，见谅