1 基本使用
package com.lzs.net;
import java.net.MalformedURLException;
import java.net.URL;
public class URLDemo1 {
public static void main(String[] args) throws MalformedURLException {
URL url= new URL("http://www.baidu.com:80/index.html#aa?username=lzs");//絕對路徑建構
System.out.println(url.getProtocol());
System.out.println(url.getHost());
System.out.println(url.getPort());
System.out.println(url.getFile());
System.out.println(url.getPath());
System.out.println(url.getRef());//錨點
System.out.println(url.getAuthority());//
System.out.println(url.getQuery());//？參數，如果存在錨點傳回null
System.out.println(url.getUserInfo());
URL url1= new URL("http://www.baidu.com:80/a/");//相對路徑建構
URL url2=new URL(url1,"b.txt");
System.out.println(url2.toString());
}
}
2 擷取某網頁源碼源碼
package com.lzs.net;
import java.io.*;
import java.net.URL;
public class URLDemo2 {
public static void main(String[] args) throws IOException {
URL url= new URL("http://www.baidu.com");
InputStream is=url.openStream();
// int len=0;
// byte[] flust=new byte[1024];
// while (-1!=(len=is.read(flust))){
// System.out.println(new String(flust,0,len));
// }
// is.close();
String msg=null;
BufferedReader br=new BufferedReader(new InputStreamReader(is,"utf-8"));
BufferedWriter bw=new BufferedWriter(new FileWriter("baidu.html"));
while (null!=(msg=br.readLine())){
bw.append(msg);
bw.newLine();
}
bw.flush();
bw.close();
br.close();
}
}