URL get

import java.io.FileWriter;
import java.io.Writer;
import java.net.URL;
import java.util.Scanner;

public class A {
  public static void main(String[] args) {
    if (args.length < 2) System.exit(1);
    URL url = null;
    try {
      url = new URL(args[0]);
    }
    catch (Exception e) {
      System.err.println("url error.");
      System.exit(1);
    }
    Scanner in = null;
    try {
      in = new Scanner(url.openStream());
    }
    catch (Exception e) {
      System.err.println("url can't open.");
      System.exit(1);
    }
    Writer out = null;
    try {
      out = new FileWriter(args[1]);
    }
    catch (Exception e) {
      System.err.println("write file error.");
      System.exit(1);
    }
    StringBuffer sb = new StringBuffer();
    while (in.hasNextLine()) {
      sb.append(in.nextLine());
      sb.append('\n');
    }
    try {
      out.write(sb.toString());
    }
    catch (Exception e) {
      System.err.println("write error.");
      System.exit(1);
    }
  }
}