请用java实现输入一URL显示返回HTML内容的JAR

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;

public class UrlReader {

public static String read(String url) throws IOException {
StringBuffer html = new StringBuffer();

URL addrUrl = null;
URLConnection urlConn = null;
BufferedReader br = null;
try {
addrUrl = new URL(url);
urlConn = addrUrl.openConnection();
br = new BufferedReader(new InputStreamReader(urlConn
.getInputStream()));

String buf = null;
while ((buf = br.readLine()) != null) {
html.append(buf + "\r\n");
}
} finally {
if(br != null){
br.close();
}
}

return html.toString();
}

public static void main(String[] args){
System.out.println("请输