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

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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 xxxx
int 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);
}
} else
outBuffer.append(aChar);
}
return outBuffer.toString();
}