HttpURLConnection上传文件(图片)小试

需求:用HttpURLConnection模拟上传图片并把图片的名称也要传递过去.

简单分析:写入流的时候依次写入 图片名称 + "|" 分隔符　+  图片流

然后服务器接收的再处理流．分别取出图片名和图片.

/**     * 上传方法     * 返回上传完毕的文件名     * *     */    public String upload(File f)    {        try        {            //服务器IP(这里是从属性文件中读取出来的)            String hostip = FileSupport.getServerIP();            URL url = new URL("http://"+ hostip +"/oxServer/ReceiveServlet");                        HttpURLConnection uc = (HttpURLConnection) url.openConnection();            //上传图片的一些参数设置            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);                    //读取文件流            int size = (int) f.length();            byte[] data = new byte[size];            FileInputStream fis = new FileInputStream(f);            OutputStream out = uc.getOutputStream();            fis.read(data, 0, size);            //写入文件名            out.write(f.getName().trim().getBytes());            //写入分隔符            out.write('|');            //写入图片流            out.write(data);            out.flush();            out.close();            fis.close();                        //读取响应数据            int code = uc.getResponseCode();            String sCurrentLine = "";            //存放响应结果            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 = "远程服务器连接失败,错误代码:" + code;            }            return sTotalString;        }        catch (Exception e)        {            e.printStackTrace();        }        return null;    }

服务器Servlet:

public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {        ServletInputStream inStream = request.getInputStream(); // 取HTTP请求流        int size = request.getContentLength(); // 取HTTP请求流长度        byte[] buffer = new byte[size]; // 用于缓存每次读取的数据        byte[] result = new byte[size]; // 用于存放结果的数组        int count = 0;        int rbyte = 0;        // 循环读取        while (count < size)        {            rbyte = inStream.read(buffer); // 每次实际读取长度存于rbyte中 sflj            for (int i = 0; i < rbyte; i++)            {                result[count + i] = buffer[i];            }            count += rbyte;        }        // 先找到文件名和图片流的标志位'|'        int index = 0;        for (int i = 0; i < result.length; i++)        {            byte b = result[i];            if (b == '|')            {                index = i;                break;            }        }        // 存放文件名        byte name[] = new byte[index + 1];        // 存放图片字节        byte[] img = new byte[size - index];        for (int i = 0; i < result.length; i++)        {            if (i < index)            {                name[i] = result[i];            }            if (i > index)            {                // 这时注意img数组的index要从0开始                img[i - index - 1] = result[i];            }        }        // 还原文件名        String fileName = new String(name);        inStream.close();        String newFileName = renameFile(fileName);        // 响应客户端        response.setContentType("text/html");        // 注意响应中文数据时要设置        response.setCharacterEncoding("GBK");        PrintWriter out = response.getWriter();        //可能情况　0 数据库无相关记录　1 文件名不符合要求 其它情况为正常        if(newFileName.equals("0"))        {            out.write("0|" + fileName);        }        else if(newFileName.equals("1"))        {            out.write("1|" + fileName);        }        else        {            out.write(fileName);        }        out.close();        //上传错误中止后续操作        if(newFileName.length()<= 1)        {            return;        }                File f = new File(ImageSupport.getOriginal() + "/" + newFileName);        FileOutputStream fos = new FileOutputStream(f);        fos.write(img);        fos.flush();        fos.close();        // 改变图片大小后重新放置到新地点        ImageSupport.changeImageSize(f, ImageSupport.getAfter() + "/"                + newFileName, 300, 300);    }

我写的是一个批量上传图片的程序，经测试通过.