android实现文件上传

//这是一个class类 在使用的时候调用就可以将path和_url传过来 

public class UploadClass {
    /**
     * path 附件本地地址
     * _url 附件存储的服务器地址
     */

    public UploadClass(String path, String _url) {

        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.i("weicypath",path+"");
                Log.i("weicyurl",_url+"");

                String end = "/r/n";
                String Hyphens = "--";
                String boundary = "*****";
                try{
                    URL url = new URL(_url);
                    HttpURLConnection con = (HttpURLConnection) url.openConnection();
                    /* 允许Input、Output，不使用Cache */
                    con.setDoInput(true);
                    con.setDoOutput(true);
                    con.setUseCaches(false);
                    /* 设定传送的method=POST */
                    con.setRequestMethod("POST");
                    /* setRequestProperty */
                    con.setRequestProperty("Connection", "Keep-Alive");
                    con.setRequestProperty("Charset", "UTF-8");
                    con.setRequestProperty("Content-Type",
                            "multipart/form-data;boundary=" + boundary);
                    /* 设定DataOutputStream */
                    DataOutputStream ds = new DataOutputStream(con.getOutputStream());
                    ds.writeBytes(Hyphens + boundary + end);
                    //ds.writeBytes("Content-Disposition: form-data; "+ "name=/"file1/";filename=/"" + newName + "/"" + end);
                    ds.writeBytes(end);
                    /* 取得文件的FileInputStream */
                    FileInputStream fStream = new FileInputStream(path);
                    /* 设定每次写入1024bytes */
                    int bufferSize = 1024;
                    byte[] buffer = new byte[bufferSize];
                    int length = -1;
                    /* 从文件读取数据到缓冲区 */
                    while ((length = fStream.read(buffer)) != -1){
                        /* 将数据写入DataOutputStream中 */
                        ds.write(buffer, 0, length);
                    }
                    ds.writeBytes(end);
                    ds.writeBytes(Hyphens + boundary + Hyphens + end);
                    fStream.close();
                    ds.flush();
                    /* 取得Response内容 */
                    InputStream is = con.getInputStream();
                    int ch;
                    StringBuffer b = new StringBuffer();
                    while ((ch = is.read()) != -1){
                        b.append((char) ch);
                    }
                    System.out.println("上传成功");
                    Log.i("weicypath",path+"上传成功");
                    ds.close();
                } catch (Exception e){
                    System.out.println("上传失败" + e.getMessage());
                    Log.i("weicypath",path+"上传失败");

                }
            }
        });

    }
}