http访问

Android程序中http访问的方法有HttpClient和HttpURLConnection两种，一般推荐用HttpURLConnection

1.HttpClient

public class HttpUtils {
/**
* 判断网络状态
* @return
*/
public static boolean isNetWorkConn(Context context){
//得到系统的网络管理对象
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if(info == null){
return false;
}else{
return true;
}
}

/**
* 根据网络地址 下载相应的数据
* @param path
* @return
*/
public static byte[] getHttpResult(String path){
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(path);
try {
HttpResponse httpResponse = httpclient.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode() == 200){
InputStream inputStream = httpResponse.getEntity().getContent();
byte[] buffer = new byte[1024];
int temp =0;
while((temp = inputStream.read(buffer))!=-1){
outputStream.write(buffer, 0, temp);
outputStream.flush();//刷新流
}
}
return outputStream.toByteArray();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;

}

}

2.HttpURLConnection

public class HttpUtil {

public static String getJsonString(String path){
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
String result = "";
try {
URL url = new URL(path);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setReadTimeout(5000);
connection.setDoInput(true);
connection.connect();
//判断是否响应成功
if(connection.getResponseCode() == 200){
InputStream inputStream = connection.getInputStream();
byte[] buffer = new byte[1024];
int temp = 0;
while ((temp = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, temp);
outputStream.flush();
}
}
//返回结果
return outputStream.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}

}