Java 获取URL的内容

public String getUrlContent(String path){
String rtn = "";
int c;
try{
java.net.URL l_url = new java.net.URL(path);
java.net.HttpURLConnection l_connection = (java.net.HttpURLConnection) l_url.openConnection();
l_connection.setRequestProperty("User-agent","Mozilla/4.0");
l_connection.connect();
InputStream l_urlStream = l_connection.getInputStream();
while (( ( c= l_urlStream.read() )!=-1)){
int all=l_urlStream.available();
byte[] b =new byte[all];
l_urlStream.read(b);
rtn+= new String(b, "UTF-8");
}
//Thread.sleep(2000);
l_urlStream.close();
}catch(Exception e){
e.printStackTrace();
}
return rtn;
}

while (( ( c= l_urlStream.read() )!=-1)){
int all=l_urlStream.available();
byte[] b =new byte[all];
l_urlStream.read(b);
rtn+= new String(b, "UTF-8");
}