我正在尝试从HttpURLConnection的输入流中读取：

InputStream input = conn.getInputStream();
InputStreamReader isr = new InputStreamReader((input));
BufferedReader br = new BufferedReader(isr);

StringBuilder out = new StringBuilder("");
String output;
while ((output = br.readLine()) != null) {
    out.append(output);
}

当输入流包含大量数据时,这确实花费了太多时间.有可能对此进行优化吗？

解决方法:

也许这会更快一些,导致内部使用并行机制的Java 8 ist中的新Stream API：

package testing;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.stream.Stream;

public class StreamTest {

  /**
   * @param args the command line arguments
   * @throws java.io.IOException
   */
  public static void main(String[] args) throws IOException {
    URL url = new URL("http://www.google.com");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setUseCaches(false);
    if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
      BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));

      Stream<String> s = br.lines();
      s.parallel().forEach(System.out::println);      
    }
  }

}