[转]Android-网络通信框架Volley使用详解

1 Volley发送get请求：

public void getJson() {
    String url = "http://"+host+":8080/web/json.jsp?username=xjs&password=123456";
    mQueue.add(new JsonObjectRequest(Method.GET, url, null,
        new Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                Log.e(TAG, "response : " + response.toString());
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                String err = error.getMessage();
                Log.e(TAG, "err : " + err);
            }
        }));
}

2 Volley发送post请求：

public void postJson() {
    String url = "http://"+host+":8080/web/json.jsp";
    StringRequest postRequest = new StringRequest(
            Request.Method.POST,
            url,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    // response
                    Log.d("Response", response);
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    // error
                    Log.d("Error.Response", error.getMessage());
                }
            }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put("username", "xjs");
            params.put("password", "123456");
            return params;
        }
    };
    mQueue.add(postRequest);
}

3 Volley获取网络图片：

public void getImage() {
    String imageUrl = "http://"+host+":8080/web/image.jsp";
    NetworkImageView view = (NetworkImageView) findViewById(R.id.network_image_view);
    view.setDefaultImageResId(android.R.drawable.ic_menu_rotate);
    view.setErrorImageResId(android.R.drawable.ic_delete);
    view.setImageUrl(imageUrl, new ImageLoader(mQueue, new BitmapLruCache(1024 * 4)));
}

4 Volley发送Https请求，需要修改源码：

protected HttpURLConnection createConnection(URL url) throws IOException {
    if (url.toString().toLowerCase(Locale.CHINA).startsWith("https")) {
        HTTPSTrustManager.allowAllSSL();
    }
    return (HttpURLConnection) url.openConnection();
}
//HTTPSTrustManager.java:
public class HTTPSTrustManager implements X509TrustManager {
    private static TrustManager[] trustManagers;
    private static final X509Certificate[] _AcceptedIssuers = new X509Certificate[] {};
    @Override
    public void checkClientTrusted(
            java.security.cert.X509Certificate[] x509Certificates, String s)
            throws java.security.cert.CertificateException {
        // To change body of implemented methods use File | Settings | File
        // Templates.
    }
    @Override
    public void checkServerTrusted(
            java.security.cert.X509Certificate[] x509Certificates, String s)
            throws java.security.cert.CertificateException {
        // To change body of implemented methods use File | Settings | File
        // Templates.
    }
    public boolean isClientTrusted(X509Certificate[] chain) {
        return true;
    }
    public boolean isServerTrusted(X509Certificate[] chain) {
        return true;
    }
    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return _AcceptedIssuers;
    }
    public static void allowAllSSL() {
        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                // TODO Auto-generated method stub
                return true;
            }
        });
        SSLContext context = null;
        if (trustManagers == null) {
            trustManagers = new TrustManager[] { new HTTPSTrustManager() };
        }
        try {
            context = SSLContext.getInstance("TLS");
            context.init(null, trustManagers, new SecureRandom());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        }
        HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());
    }
}

5 Volley获取服务端返回的cookie，需要修改源码：

@Override
public HttpResponse performRequest(Request<?> request,Map<String, String> additionalHeaders)
    throws IOException,AuthFailureError {
    for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
    if (header.getKey() != null) {
        String key = header.getKey();
        List<String> values = header.getValue();
        if(key.equalsIgnoreCase("set-cookie")){
            StringBuilder cookieString = new StringBuilder();
            for(String value : values){
                cookieString.append(value).append("
");//用
作为分隔符，cookie中不应该有回车符号
            }
            cookieString.deleteCharAt(cookieString.length() - 1);
            Header h = new BasicHeader(header.getKey(), cookieString.toString());
            response.addHeader(h);
        }else{
            Header h = new BasicHeader(header.getKey(), values.get(0));
            response.addHeader(h);
        }
    }
}
}
//然后再request中重写parseNetworkResponse（）：
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
    Response<String> superResponse = super.parseNetworkResponse(response);
    Map<String, String> responseHeaders = response.headers;
    String rawCookies = responseHeaders.get("Set-Cookie");
    //服务端返回是 set-cookie:JSESSIONID=D90B58454550B4D37C4B66A76BF27B93; Path=/otn BIGipServerotn=2564030730.64545.0000; path=/
    String part1 = substring(rawCookies, "", ";");
    String part2 = substring(rawCookies, "
", ";");
    //客户端需要的是 cookie:JSESSIONID=D90B58454550B4D37C4B66A76BF27B93; BIGipServerotn=2564030730.64545.0000;
    cookies = part1 + "; " + part2 + ";";
    return superResponse;
}

6 Volley发请求的时候上传cookie，在request中重写getHeaders（）：

@Override
public Map<String, String>getHeaders() throws AuthFailureError {
         if(cookies!= null && cookies.length() > 0){
                   HashMap<String,String>         headers = newHashMap<String, String>();
                   headers.put("Cookie",cookies);
                   returnheaders;
         }
         returnsuper.getHeaders();
}

7 Volley自定义request：

public class ByteArrayRequest extends Request<byte[]>{
    private final Listener<byte[]> mListener;
    public ByteArrayRequest(int method, String url, Listener<byte[]> listener, ErrorListener errlistener) {
        super(method, url, errlistener);
        mListener = listener;
    }
    @Override
    protected Response<byte[]> parseNetworkResponse(NetworkResponse response) {
        if(response == null){
            return null;
        }
        if(response.statusCode != HttpStatus.SC_OK){
            return null;
        }
        byte[] bytes = response.data;
        return Response.success(bytes, null);
    }
    @Override
    protected void deliverResponse(byte[] response) {
        if(mListener != null){
            mListener.onResponse(response);
        }
    }
}

8 Volley设置请求超时时间：

@Override
public RetryPolicy getRetryPolicy() {
         RetryPolicyretryPolicy = new DefaultRetryPolicy(5000,DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
         returnretryPolicy;
}

如果是用这种方式上传post参数：

public void postJson() {
        String url = "http://"+host+":8080/web/json.jsp";
        HashMap<String, String> params = new HashMap<String, String>();
        params.put("username", "xjs");
        params.put("password", "123456");
        JsonObjectRequest postRequest = new JsonObjectRequest(
                Request.Method.POST,
                url,
                new JSONObject(params),
                new Response.Listener<JSONObject>() {
                   @Override
                   public void onResponse(JSONObject response) {
                       Log.e(TAG, "response : " + response.toString());
                   }
                },
                new Response.ErrorListener() {
                   @Override
                   public void onErrorResponse(VolleyError error) {
                       Log.e("Error: ", error.getMessage());
                   }
               });
        mQueue.add(postRequest);
    }

要注意，上传的参数并不是按照key-value拼接起来放在body中上传的，而是按照json的形式上传的，因此，服务端用request.getParameter("key")这种形式是无法取出来value的，只能是request.getInputStream()，然后把整个的body还原出原来的json串，然后从json中再取值。

附一个登陆铁道部12306的例子，源码在：http://download.csdn.net/download/goldenfish1919/7029907

Ps：我在测试的时候用了本地的一个tomcat，一块打包放在了asserts下面。

参考：

http://blog.csdn.net/xyz_lmn/article/details/12165391

http://blog.csdn.net/xyz_lmn/article/details/12746581

http://blog.csdn.net/xyz_lmn/article/details/12177005

http://www.itsalif.info/content/android-volley-tutorial-http-get-post-put

概述：http://blog.csdn.net/t12x3456/article/details/9221611

入门： http://blog.csdn.net/ttdevs/article/details/17566795

自定义request： http://blog.csdn.net/ttdevs/article/details/17586205

源码分析：http://blog.csdn.net/ttdevs/article/details/17764351

发送https请求：http://blog.csdn.net/llwdslal/article/details/18052723

构造cache：http://stackoverflow.com/questions/16682595/android-volley-imageloader-bitmaplrucache-parameter

解析服务端cookie：http://stackoverflow.com/questions/20702178/android-volley-access-http-response-header-fields，http://blog.csdn.net/hpb21/article/details/12163371

上传cookie：http://stackoverflow.com/questions/17049473/how-to-set-custom-header-in-volley-request

设置超时：http://stackoverflow.com/questions/17094718/android-volley-timeout

http://blog.csdn.net/dacainiao007/article/details/12617747，这里关于超时时间增长的因子的说法不准确，应该是当第一次连接超时以后，第二次超时时间会变为原来的多少倍，连接超时和读取超时设置为同一个数。