Android 文件上传下载

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最近有个需求是图片的上传下载，因为是小功能点，所以不打算用框架写了，就httpurlconnnection+threadpool请求一下就完事了，之前调了一阵，结果下载的图片大小都是0k，还没找到原因，这里备份一下最后的代码。

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package com.example.testwebview.http;

import com.example.testwebview.moudle.DebugLog;
import com.example.testwebview.moudle.Environment;
import com.example.testwebview.moudle.common.Const;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpPostUploadUtil {

    public static String upload() {
        try {
            String path = Environment.getInstance().getExternalStorageDirectory() + "/" + Const.FILE_PATH_NAME;
            DebugLog.v("path", "path:" + path);
            File file = new File(path);
            String ur = "http://192.168.253.1:8088/groovy/ocr.groovy";
            URL url = new URL(ur);

            HttpURLConnection uc = (HttpURLConnection) url.openConnection();
            uc.setRequestProperty("Accept", "image/gif,   image/x-xbitmap,   image/jpeg,   image/pjpeg,   application/vnd.ms-excel,   application/vnd.ms-powerpoint,   application/msword,   application/x-shockwave-flash,   application/x-quickviewplus,   */*");
            uc.setRequestProperty("Accept-Language", "zh-cn");
            uc.setRequestProperty("Content-type", "multipart/form-data;   boundary=---------------------------7d318fd100112");
            uc.setRequestProperty("Accept-Encoding", "gzip,   deflate");
            uc.setRequestProperty("User-Agent", "Mozilla/4.0   (compatible;   MSIE   6.0;   Windows   NT   5.1)");
            uc.setRequestProperty("Connection", "Keep-Alive");
            uc.setDoOutput(true);
            uc.setUseCaches(true);
            int size = (int) file.length();
            byte[] data = new byte[size];
            FileInputStream fis = new FileInputStream(file);
            OutputStream out = uc.getOutputStream();
            fis.read(data, 0, size);

            out.write(data);
            out.flush();
            out.close();
            fis.close();

            int code = uc.getResponseCode();
            String sCurrentLine = "";
            String sTotalString = "";
            if (code == 200) {
                java.io.InputStream is = uc.getInputStream();
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(is));
                while ((sCurrentLine = reader.readLine()) != null)
                    if (sCurrentLine.length() > 0)
                        sTotalString = sTotalString + sCurrentLine.trim();
            } else {
                sTotalString = "错误:" + code;
            }
            return sTotalString;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(3 * 1000);  //设置超时间为3秒
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");  //防止屏蔽程序抓取而返回403错误
        InputStream inputStream = conn.getInputStream(); //得到输入流
        byte[] getData = readInputStream(inputStream);   //获取自己数组

        File saveDir = new File(savePath);   //文件保存位置
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }
        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if (fos != null) {
            fos.close();
        }
        if (inputStream != null) {
            inputStream.close();
        }
        System.out.println("info:" + url + " download success");
    }

    public static byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }
}