從Internet獲取數據
利用HttpURLConnection對象,我們可以從網絡中獲取網頁數據.
URL url = newURL("http://www.sohu.com");
HttpURLConnection conn =(HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5*1000);//設置連接超時
conn.setRequestMethod(“GET”);//以get方式發起請求
if (conn.getResponseCode()!= 200) throw new RuntimeException("請求url失敗");
InputStream is =conn.getInputStream();//得到網絡返回的輸入流
String result = readData(is,"GBK");
conn.disconnect();
//第一個參數爲輸入流,第二個參數爲字符集編碼
public static StringreadData(InputStream inSream, String charsetName) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while( (len = inSream.read(buffer)) != -1 ){
outStream.write(buffer,0, len);
}
byte[] data = outStream.toByteArray();
outStream.close();
inSream.close();
return new String(data, charsetName);
}
從Internet獲取數據
利用HttpURLConnection對象,我們可以從網絡中獲取文件數據.
URL url = newURL("http://photocdn.sohu.com/20100125/Img269812337.jpg");
HttpURLConnection conn =(HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5*1000);
conn.setRequestMethod("GET");
if (conn.getResponseCode()!= 200) throw new RuntimeException("請求url失敗");
InputStream is =conn.getInputStream();
readAsFile(is,"Img269812337.jpg");
public static voidreadAsFile(InputStream inSream, File file) throws Exception{
FileOutputStream outStream = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int len = -1;
while( (len = inSream.read(buffer)) != -1 ){
outStream.write(buffer,0, len);
}
outStream.close();
inSream.close();
}