Android(安卓)http请求例子、Unicode转UTF-8 java代码收藏

http://blog.csdn.net/wyzxk888/article/details/7337649

Android项目经常是C/S模型的，因此需要向服务器发出http请求，收藏一个http请求的例子以便以后可以用。

假设发出的请求使用get方法，服务器传回JSON数据，解析代码如下：

HttpClient client = new DefaultHttpClient();HttpGet httpGet = new HttpGet(req_url);try {HttpResponse response = client.execute(httpGet);int statusCode = response.getStatusLine().getStatusCode();if (statusCode != HttpStatus.SC_OK) {Log.d("AD", "statusCode is " + statusCode);return null;} else {HttpEntity entity = response.getEntity();if (entity != null) {InputStream inputStream = entity.getContent();StringBuilder builder = new StringBuilder();BufferedReader bufferedReader  = new BufferedReader(new InputStreamReader(inputStream));for (String s = bufferedReader.readLine(); s != null; s = bufferedReader.readLine()) {builder.append(s);}String result = builder.toString();Log.d("AD", "Server return " + result);return result;}} } catch (Exception e) {httpGet.abort();Log.d("AD", "when http get, exception is " + e.getMessage());}return null;

注：JSON数据格式其实就是String。可以用JSONObject类进行转化。

有时候服务器传回的数据中会遇到传回数据为Unicode的情况，为此需要进行Unicode转UTF-8的转化，我在项目中遇见过，为此收藏一份转化 java 代码，便于以后使用：

private static String decodeUnicode(String theString) {char aChar;int len = theString.length();StringBuffer outBuffer = new StringBuffer(len);for (int x = 0; x < len;) {aChar = theString.charAt(x++);if (aChar == '\\') {aChar = theString.charAt(x++);if (aChar == 'u') {// Read the xxxxint value = 0;for (int i = 0; i < 4; i++) {aChar = theString.charAt(x++);switch (aChar) {case '0':case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8':case '9':value = (value << 4) + aChar - '0';break;case 'a':case 'b':case 'c':case 'd':case 'e':case 'f':value = (value << 4) + 10 + aChar - 'a';break;case 'A':case 'B':case 'C':case 'D':case 'E':case 'F':value = (value << 4) + 10 + aChar - 'A';break;default:throw new IllegalArgumentException("Malformed   \\uxxxx   encoding.");}}outBuffer.append((char) value);} else {if (aChar == 't')aChar = '\t';else if (aChar == 'r')aChar = '\r';else if (aChar == 'n')aChar = '\n';else if (aChar == 'f')aChar = '\f';outBuffer.append(aChar);}} elseoutBuffer.append(aChar);}return outBuffer.toString();}

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