uri.getPath() 获取地址 上传提示 No such file or directory

FileInputStream 运行 是提示   No such file or directory ，这个怎么解决。
uri.getPath() 不是获取的文件的地址吗？为什么上传还会报错呢？下面是源代码package com.example.dataup;import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;import java.io.File;public class MainActivity extends Activity {    private Button btn1;
    private Button btn2;    private String uploadUrl = "http://www.maizitime.com:8081/upload_test";
    private String filePath;
    private String filePath1;
    private String filePath2;    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("test", "程序启动");
        Log.e("test", "程序启动");
        Log.d("test", "程序启动");
        Log.v("test", "程序启动");
        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);        btn1.setOnClickListener(new ButtonClickListener());
        btn2.setOnClickListener(new ButtonClickListener());
    }    class ButtonClickListener implements View.OnClickListener {        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btn1:                    chooseFile();                    break;                case R.id.btn2:                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            UploadUtil.uploadFile(new File(filePath), uploadUrl);
                        }
                    }).start();                    break;                default:
                    break;
            }
        }
    }    private void chooseFile() {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent, 1);
    }    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case 1:
                if (resultCode == RESULT_OK) {
                    Uri uri = data.getData();
                    filePath = uri.getPath();
                    Log.i("test", "filePath1:" + filePath);
                }
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}
package com.example.dataup;import android.util.Log;import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;/**
 * Created by blue on 2016/3/26.
 */
public class UploadUtil {    private static final int TIME_OUT = 10 * 1000;
    private static final String CHARSET = "UTF-8";    public static int uploadFile(File file, String requestURL) {
        int res = 0;        String BOUNDARY = UUID.randomUUID().toString();// boundary
        String PREFIX = "--";
        String LINE_END = "\r\n";
        String CONTENT_TYPE = "multipart/form-data";        try {
            URL url = new URL(requestURL);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setReadTimeout(TIME_OUT);
            httpURLConnection.setConnectTimeout(TIME_OUT);
            httpURLConnection.setDoInput(true);
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setUseCaches(false);
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setRequestProperty("Charset", CHARSET);
            httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Content-type", CONTENT_TYPE + ";boundary=" + BOUNDARY);            if (file != null) {
                Log.i("test", "upload start1");
                DataOutputStream dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());
                StringBuffer sb = new StringBuffer();
                sb.append(PREFIX);
                sb.append(BOUNDARY);
                sb.append(LINE_END);
                sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"" + LINE_END);
                sb.append("Content-Type: application/octet-stream; Charset=" + CHARSET + LINE_END);
                sb.append(LINE_END);                Log.i("test", "upload start2");
                Log.i("test", "upload start3");
                dataOutputStream.write(sb.toString().getBytes());
                Log.i("test", "upload start4"+file);
                InputStream inputStream = new FileInputStream(file);
                Log.i("test", "upload start5"+inputStream);
                byte[] bytes = new byte[1024];
                int len = 0;
                Log.i("test", "upload start5");
                while ((len = inputStream.read(bytes)) != -1) {
                    dataOutputStream.write(bytes, 0, len);
                    Log.i("test", "upload bytes:" + len);
                }
                Log.i("test", "upload start6");
                inputStream.close();
                dataOutputStream.write(LINE_END.getBytes());                String end = PREFIX + BOUNDARY + PREFIX + LINE_END;
                dataOutputStream.write(end.getBytes());
                dataOutputStream.flush();
                Log.i("test", "upload end");                res = httpURLConnection.getResponseCode();
                if (res == 200) {
                    Log.i("test", "upload success");
                    InputStream inputStream1 = httpURLConnection.getInputStream();
                    StringBuffer stringBuffer = new StringBuffer();
                    while ((len = inputStream1.read(bytes)) != -1) {
                        stringBuffer.append(new String(bytes, 0, len, "UTF-8"));
                    }
                    Log.i("test", "result:" + stringBuffer.toString());
                } else {
                    Log.i("test", "upload fail");
                }
            }        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }        return res;
    }
}