Java和PHP配合：deflate(压缩)和inflate(解压)

一、Java中deflate压缩发送给php解压缩

• Android中deflate代码

OutputStream urlOutStream = urlConnection.getOutputStream();// 要使用no_wrap的Deflater，php才能解压，9是最高的压缩级别，可以设置为1-9的级别，1速度最快DeflaterOutputStream deflaterOut = new DeflaterOutputStream(urlOutStream, new Deflater(9, true));deflaterOut.write((stringToPost[0]).getBytes());deflaterOut.close();urlOutStream.close();

• PHP中inflate及deflate代码

<?php// 首先获取post的字符串：//   因为是直接写入的压缩字符串，//   通过$_POST[]并不能获取post内容，//   可以通过原始请求数据的只读输入流获得post内容$postStr = file_get_contents('php://input');// Java中默认的Deflater的数据格式有wrap，Java中应设置no_wrap的Deflater// 如果Java中没有指定no_wrap的Deflater，则PHP中通过下面的算法将wrap去掉，也可以正常解压// $deflateForPHP = substr($postStr, 2, -4);// 解压缩获得请求的内容$plainRequest = gzinflate($postStr);// code here ...// 将处理结果压缩后返回请求端$result = "准备发给android的处理结果";echo gzdeflate($result);?>

• Android中inflate代码

if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {   InputStream urlInputStream = urlConnection.getInputStream();   // php中gzdeflate()压缩的结果，没有wrap，需要自行计算头尾验证字符，   //   或者指定new Inflater(true)的解压器才能正确解压（注意：没了传输错误校验）   InflaterInputStream inflaterIn = new InflaterInputStream(urlInputStream, new Inflater(true));   BufferedReader reader = new BufferedReader(new InputStreamReader(inflaterIn));   String res = "", line;   while ((line = reader.readLine()) != null) {       res += line;   }   Log.i(TAG, "Response length: " + res.length() + " response: " + res);   reader.close();   inflaterIn.close();   urlInputStream.close();   urlConnection.disconnect();   return res;}

二、完整代码：

private class mHttp extends AsyncTask<String, Void, String> {        private URL mUrl;        private String mMethod = "GET";        private int mHttpTimeout = 3000;    /* milliseconds */        private String TAG = "mHttp";        public mHttp(String url, String method) throws MalformedURLException {            mUrl = new URL(url);            if(method.toUpperCase().contains("POST")) mMethod = "POST";        }        public mHttp(String url) throws MalformedURLException {            mUrl = new URL(url);        }        @Override        protected String doInBackground(String... stringToPost) {            if (mUrl != null) {                try {                    HttpURLConnection urlConnection = (HttpURLConnection) mUrl.openConnection();                    urlConnection.setReadTimeout(mHttpTimeout);                    urlConnection.setConnectTimeout(mHttpTimeout);                    urlConnection.setRequestMethod(mMethod);                    urlConnection.setDoInput(true);                    // PHP已经应用pzdeflate()处理了结果，添加Accept-Encoding的header避免Apache再deflate处理                    urlConnection.addRequestProperty("Accept-Encoding", "q=1.0 identity");                    if (mMethod.equals("POST")) {                        urlConnection.setDoOutput(true);                        urlConnection.addRequestProperty("Content-Encoding", "deflate");                        OutputStream urlOutStream = urlConnection.getOutputStream();                        DeflaterOutputStream deflaterOut = new DeflaterOutputStream(urlOutStream, new Deflater(9, true));                        deflaterOut.write((stringToPost[0]).getBytes());                        deflaterOut.close();                        urlOutStream.close();                    }                    urlConnection.connect();                    if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {                        InputStream urlInputStream = urlConnection.getInputStream();                        InflaterInputStream inflaterIn = new InflaterInputStream(urlInputStream, new Inflater(true));                        BufferedReader reader = new BufferedReader(new InputStreamReader(inflaterIn));                        String res = "", line;                        while ((line = reader.readLine()) != null) {                            res += line;                        }                        Log.i(TAG, "Response length: " + res.length() + " response: " + res);                        reader.close();                        inflaterIn.close();                        urlInputStream.close();                        urlConnection.disconnect();                        return res;                    } else {                        // show response code.                        Log.i(TAG, "doInBackground: responseCode: " + urlConnection.getResponseCode());                        urlConnection.disconnect();                        return null;                    }                } catch (Exception e) {                    e.printStackTrace();                }            }            return null;        }        @Override        protected void onPostExecute(String result) {            Log.i(TAG, "onPostExecute: " + result);            // 处理result字符串，例如显示在UI组件上            // code here...        }    }mHttp http = new mHttp("http://examle.com/page.php", "post");http.execute("String to be posted to the server");

用到的链接：
php://input 原始请求数据的只读输入流
DeflaterOutputStream
Deflater
InflaterInputStream
Inflater
gzinflate-in-java

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