Http get和post的使用

1.通过GET 请求获取数据
public static String sendGetRequest(String endpoint,
String requestParameters) {
Log.i("sendGetRequest", endpoint);
String result = null;
if (endpoint.startsWith("http://")) {
// Send a GET request to the servlet
try {
// Construct data
StringBuffer data = new StringBuffer();
// Send data
String urlStr = endpoint;
if (requestParameters != null && requestParameters.length() > 0) {
urlStr += "?" + requestParameters;
}
Log.i("urlStr", urlStr);
URL url = new URL(urlStr);
URLConnection conn = url.openConnection();
// Get the response
BufferedReader rd = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
StringBuffer sb = new StringBuffer();
String line;
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
result = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}}
Log.i("sendGetRequest", result);
return result;
}
比如再举个实际的例子，通过指定URL 的图片，获取图片数据，并转换成Android 的支持的图片格式，相关代码
如下：
// 显示网络上的图片
public static Bitmap returnBitMap(String url) {
Log.i("returnBitMap", "url=" + url);
URL myFileUrl = null;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
2.通过POST 提交数据
一、
public void MyFunction{
HttpClient httpclient = new DefaultHttpClient();
//你的URL
HttpPost httppost = new HttpPost("http://www.eoeandroid.com/post_datas.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
//Your DATA
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("stringdata", "eoeAndroid.com is Cool!"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response;
response=httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
二、首先判断网络是否正常再发送消息
//发送http信息，并信息进行编码
public String SendDataPost(String url, String post)
{
// 判断网络链接是否正常
if (isNetworkAvailable(fromcon)) {
try
{
String mString = new String(post.getBytes(), “UTF-8″);
URL iurl = new URL(url);//直接提交地址，不要带参数
HttpURLConnection objConn = (HttpURLConnection)iurl.openConnection();
//objConn.setRequestProperty(“Cookie”,HttpTools.PublishCookies());
objConn.setDoOutput(true);
objConn.setDoInput(true);
objConn.setRequestProperty(“Content-type”,”application/x-www-form-urlencoded”);
objConn.setRequestMethod(“POST”);
objConn.setRequestProperty(“Content-Length”,String.valueOf(mString.toCharArray().length));
objConn.setConnectTimeout(30000);
objConn.setReadTimeout(30000);
objConn.connect();
OutputStream objSM = objConn.getOutputStream();
OutputStreamWriter objSW = new OutputStreamWriter(objSM);
BufferedWriter out = new BufferedWriter(objSW);
out.write(mString.toCharArray(),0,mString.toCharArray().length);
out.flush();
out.close();
InputStream objSMP = objConn.getInputStream();
InputStreamReader objSRP = new InputStreamReader(objSMP, “utf-8″);
BufferedReader in = new BufferedReader(objSRP);
String line = null;
StringBuilder sb = new StringBuilder();
while ((line = in.readLine()) != null) {
sb.append(line);
}
in.close();
String resp = sb.toString();
objSMP.close();
objConn.disconnect();
return resp;
}catch (Exception ex) {
Log.i(“CCCC”, ex.toString());
return “”;
}
}else{
Intent intent0 = new Intent(fromcon,LoginActivity.class);
intent0.putExtra(“msg”,“您当前网络连接已禁用，请重新设置!”);
fromcon.startActivity(intent0);
return “”;
}
}
// 判断网络是否正常
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (info == null) {
return false;
} else {
if (info.isAvailable()) {
return true;
}
}
}
return false;
｝