Java和PHP配合：deflate(壓縮)和inflate(解壓)
一、Java中deflate壓縮發送給php解壓縮
Android中deflate代碼
OutputStream urlOutStream = urlConnection.getOutputStream(); // 要使用no_wrap的Deflater，php才能解壓，9是最高的壓縮級別，可以設置為1-9的級別，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代碼 （有時候終端方法壓縮時會自動base64加密一次，php需要先解base64）https://tool.oschina.net/encrypt?type=3
<?php
// 首先獲取post的字符串：
// 因為是直接寫入的壓縮字符串，
// 通過$_POST[]並不能獲取post內容，
// 可以通過原始請求數據的只讀輸入流獲得post內容
$postStr = file_get_contents('php://input');
// Java中默認的Deflater的數據格式有wrap，Java中應設置no_wrap的Deflater
// 如果Java中沒有指定no_wrap的Deflater，則PHP中通過下面的算法將wrap去掉，也可以正常解壓
// $deflateForPHP = substr($postStr, 2, -4);
// 解壓縮獲得請求的內容
$plainRequest = gzinflate($postStr);
// code here ...
// 將處理結果壓縮后返回請求端
$result = "准備發給android的處理結果";
echo gzdeflate($result);
?>
Android中inflate代碼
if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
InputStream urlInputStream = urlConnection.getInputStream();
// php中gzdeflate()壓縮的結果，沒有wrap，需要自行計算頭尾驗證字符，
// 或者指定new Inflater(true)的解壓器才能正確解壓（注意：沒了傳輸錯誤校驗）
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、完整代碼：
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已經應用pzdeflate()處理了結果，添加Accept-Encoding的header避免Apache再deflate處理
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);
// 處理result字符串，例如顯示在UI組件上
// code here...
}
}
mHttp http = new mHttp("http://examle.com/page.php", "post");
http.execute("String to be posted to the server");
用到的鏈接：
php://input 原始請求數據的只讀輸入流
DeflaterOutputStream
Deflater
InflaterInputStream
Inflater
gzinflate-in-java