Android使用Volley实现上传文件功能

/**
* Created by wangshihui on 2015/11/30.
* 上传文件
* url：.....
method：post
参数：file
接口给的参数：file 就是表单的key，传给mFilePartName;
这是个测试类，测试上传头像没有问题，适合只上传单个文件的场景
*/
public class MultipartRequest extends Request<JSONObject  {
private String mHeader;
private Map<String, String  mMap;
private String cookieFromResp = "";
private Map<String, String  headerMap = new HashMap< ();
private MultipartEntity entity = new MultipartEntity();
private final Response.Listener<JSONObject  mListener;
private final File mFilePart;
private String mFilePartName;
/**
* @param url
* @param listener
* @param errorListener
* @param file_name
* @param file
*/
public MultipartRequest(String url, Response.Listener<JSONObject  listener, Response.ErrorListener errorListener, String file_name,File file)
{
super(Method.POST, url, errorListener);
mListener = listener;
mFilePart = file;
mFilePartName=file_name;
buildMultipartEntity();
}
/**
* 添加文件参数
*/
private void buildMultipartEntity()
{
entity.addPart(mFilePartName, new FileBody(mFilePart));
}
@Override
public String getBodyContentType()
{
return entity.getContentType().getValue();
}
@Override
public byte[] getBody() throws AuthFailureError
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try
{
entity.writeTo(bos);
}
catch (IOException e)
{
VolleyLog.e("IOException writing to ByteArrayOutputStream");
}
return bos.toByteArray();
}
/**
* @param response
* @return
*/
@Override
protected Response<JSONObject  parseNetworkResponse(NetworkResponse response)
{
try {
JSONObject jsonObject;
System.out.println(response.headers.toString());
if (response.data.length != 0) {
String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
jsonObject = new JSONObject(jsonString);
} else {
jsonObject = new JSONObject();
}
//获取数据头
mHeader = response.headers.toString();
//提取Cookie(JSESSIONID)
Pattern pattern = Pattern.compile("Set-Cookie=.*?;");
Matcher matcher = pattern.matcher(mHeader);
if (matcher.find()) {
cookieFromResp = matcher.group();
cookieFromResp = cookieFromResp.substring(11, cookieFromResp.length() - 1);
System.out.println("Cookie: " + cookieFromResp);
}
jsonObject.put("Cookie", cookieFromResp);
return Response.success(jsonObject,
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
/**
* @param response
*/
@Override
protected void deliverResponse(JSONObject response)
{
mListener.onResponse(response);
}
@Override
protected Map<String, String  getParams() throws AuthFailureError {
return mMap;
}
/**
* @return
* @throws AuthFailureError
*/
@Override
public Map<String, String  getHeaders() throws AuthFailureError {
return headerMap;
}
/**
* @return
*/
@Override
public RetryPolicy getRetryPolicy() {
RetryPolicy retryPolicy = new DefaultRetryPolicy(5000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
return retryPolicy;
}
/**
* @param cookie
*/
//将Cookie加入数据头
public void setSendCookie(String cookie) {
headerMap.put("Cookie", cookie);
}
}

//指定url路径
String url = "http://182.92.....";
MultipartRequest multipartRequest = new MultipartRequest(
url, new Response.Listener<JSONObject () {
@Override
public void onResponse(JSONObject response) {
saveSessionID(response);    
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError e) {
Log.e(TAG, e.getMessage(), e);
try {
byte[] htmlBodyBytes = e.networkResponse.data;
Log.e(TAG, new String(htmlBodyBytes), e);
} catch (Exception e1) {
e1.printStackTrace();
}
ToastUtil.showShortToast(UserCenterActivity.this, "网络连接异常");
}
}, "file", mSelectedPictureFile);
multipartRequest.setSendCookie(loadSessionID());
multipartRequest.setTag(TAG);
client.addTask(multipartRequest);

public class AsynHttpClient {
//volley的请求队列
private RequestQueue requestQueue;
//保证全局变量是单一的
private static AsynHttpClient instance;
private Context mContext;
private AsynHttpClient(Context context) {
requestQueue = Volley.newRequestQueue(context);
this.mContext = context;
}
/**
* 单列模式，让AsynHttpClient在整个项目中保持只有一个
* @param context
* @return
*/
public static AsynHttpClient getInstance(Context context) {
if (instance==null){
synchronized (AsynHttpClient.class){
if (instance==null){
instance=new AsynHttpClient(context);
}
}
}
return instance;
}
/**
* 添加任务到volley的请求队列中去，并不会立即执行
* @param task
*/
public void addTask(Request task){
requestQueue.add(task);
}
public RequestQueue getRequestQueue() {
return requestQueue;
}
}