Volley扩展——文件上传（支持进度条）

来源：互联网发布：hp扫描软件编辑：程序博客网时间：2024/06/03 13:27

volley是一个轻量级的开源网络通信框架，开源的好处就是可以自由定制自己需要的jar包。volley里网络通信时android2.3以上用的HttpUrlConnection,2.3以下用的HttpClient，我做的改动只考虑了2.3以上，不支持2.3版本以下。HttpUrlConnection默认传输数据是将数据全部写到内存中再发送到服务端，Volley就是采用默认的方式，这样在上传大文件时很容易就out of memory，有一种解决办法是设置每次传输流的大小：

已知文件大小：connection .setFixedLengthStreamingMode（long l）;

不知道文件大小：connection.setChunkedStreamingMode(1024); //建议使用

android的文件上传一般都是模拟表单，也可以直接socket传，我这里是集成了表单上传，下面是关键类：

public class MultipartRequest extends Request<String> {    private final Listener<String> mListener;    private Map<String, String> headerMap;    private Map<String, String> mParams;    private FormFile[] files;    private String BOUNDARY = "---------7dc05dba8f3e19";    public MultipartRequest(String url, Listener<String> listener, Map<String, String> params, FormFile[] files) {        this(Method.POST, url, listener, params, files);    }    public MultipartRequest(int method, String url, Listener<String> listener, Map<String, String> params, FormFile[] files) {        super(method, url, listener);        mListener = listener;        mParams = params;        this.files = files;    }    @Override    public Map<String, String> getHeaders() throws AuthFailureError {        headerMap = new HashMap<String, String>();        headerMap.put("Charset", "UTF-8");        //Keep-Alive        headerMap.put("Connection", "Keep-Alive");        headerMap.put("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);        return headerMap;    }    @Override    public byte[] getBody() throws AuthFailureError {        //传参数        StringBuilder sb = new StringBuilder();        for (Map.Entry<String, String> entry : mParams.entrySet()) {            // 构建表单字段内容            sb.append("--");            sb.append(BOUNDARY);            sb.append("\r\n");            sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"\r\n\r\n");            sb.append(entry.getValue());            sb.append("\r\n");        }        return sb.toString().getBytes();    }    @Override    public void handRequest(OutputStream out) {        DataOutputStream dos = (DataOutputStream) out;        try {            //发送文件数据            if (files != null) {                for (FormFile file : files) {                    // 发送文件数据                    StringBuilder split = new StringBuilder();                    split.append("--");                    split.append(BOUNDARY);                    split.append("\r\n");                    split.append("Content-Disposition: form-data;name=\"" + file.getParameterName() + "\";filename=\"" + file.getFilname() + "\"\r\n");                    split.append("Content-Type: " + file.getContentType() + "\r\n\r\n");                    dos.write(split.toString().getBytes());                    if (file.getInStream() != null) {                        byte[] buffer = new byte[1024];                        int len = -1;                        int count = 0;                        while ((len = file.getInStream().read(buffer)) != -1) {                            dos.write(buffer, 0, len);                            count += len;                            if (mListener != null) {                                mListener.onProgressChange(file.getFileSize(), count);                            }                        }                        count = 0;                        file.getInStream().close();                    } else {                        dos.write(file.getData(), 0, file.getData().length);                    }                    dos.write("\r\n".getBytes());                }            }            dos.writeBytes("--" + BOUNDARY + "--\r\n");            dos.flush();        } catch (IOException e) {            mListener.onError(new VolleyError(e.toString()));            try {                dos.close();            } catch (IOException e1) {                e1.printStackTrace();            }        }    }    @Override    protected Response<String> parseNetworkResponse(NetworkResponse response) {        String parsed;        try {            parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers));        } catch (UnsupportedEncodingException e) {            parsed = new String(response.data);        }        return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));    }    @Override    protected void deliverResponse(String response) {        mListener.onSuccess(response);    }    @Override    public void deliverError(VolleyError error) {        mListener.onError(error);    }}

附上demo连接：http://download.csdn.net/detail/s569646547/9098291

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