Java和PHP配合：deflate(压缩)和inflate(解压)

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（有时候终端方法压缩时会自动base64加密一次，php需要先解base64）https://tool.oschina.net/encrypt?type=3

<?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");