1.先寫一個工具類HttpUtils.java:html
public class HttpUtils {java
public static String get(String url) {app
try{
URL getUrl=new URL(url);
HttpURLConnection connection=(HttpURLConnection)getUrl.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Accept","*/**");
connection.setRequestProperty("User-Agent","Mozilla/4.0(compatible;MSIE 8.0;wINDOWS nt 5.1;Trident/4.0;CIBA)");
connection.setRequestProperty("Accept-Language","zh-cn");
connection.connect();
BufferedReader reader=new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));
String line;
StringBuffer result=new StringBuffer();
while((line=reader.readLine())!=null){
result.append(line);
}
reader.close();
return result.toString();
}catch(Exception e){
e.printStackTrace();
}
return null;dom
}
}ide
2.而後寫一個主類App.java:工具
public class App {url
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame=new JFrame();
frame.setResizable(false);
frame.setSize(425, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(null);
frame.setLocationRelativeTo(null);
JTextField jTextField=new JTextField();
jTextField.setBounds(100,44,200,30);
frame.add(jTextField);
JButton jButton=new JButton("提取");
jButton.setBounds(140,144,100,30);
frame.add(jButton);
frame.setVisible(true);
jButton.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
String url=jTextField.getText();
if(url==null || url.equals("")){
JOptionPane.showMessageDialog(null, "請填寫抓取地址");
return;
}
String html=HttpUtils.get(url);
Document doc=Jsoup.parse(html);
Elements imgs=doc.getElementsByTag("img");
for(Element img : imgs){
String imgSrc=img.attr("src");
if(imgSrc.startsWith("//")){
imgSrc="http:"+imgSrc;
}
try{
Files.copy(new URL(imgSrc).openStream(), Paths.get("e://Java爬取例程/img/"+UUID.randomUUID()+".png"));
}catch(MalformedURLException el){
el.printStackTrace();
}catch(IOException el){
el.printStackTrace();
}
}
JOptionPane.showMessageDialog(null,"抓取完成");
}
});
}.net
}orm
3.而後建立以下目錄:htm
e://Java爬取例程/img/
4.運行程序App.java
5.獲得爬