我的 friend 让我在这里发布他的问题，问题就在这里:
我有一个问题...我的代码运行得很好，突然出现了一个错误。我不知道它有什么问题，也许你们可以告诉我一些我正在犯的明显错误。
那是错误的沟通:
> Exception in thread "main" java.net.MalformedURLException: no
> protocol:
> at java.net.URL.<init>(URL.java:583)
> at java.net.URL.<init>(URL.java:480)
> at java.net.URL.<init>(URL.java:429)
> at pogoda.Okienko.getJPanel(Okienko.java:120)
> at pogoda.Okienko.getJContentPane(Okienko.java:101)
> at pogoda.Okienko.initialize(Okienko.java:59)
> at pogoda.Okienko.<init>(Okienko.java:49)
> at pogoda.Pogoda.main(Pogoda.java:119)
这是我的代码:
package pogoda;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Rectangle;
import java.awt.GridBagLayout;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public final class Okienko extends JFrame
{
public static final long serialVersionUID = 1L;
public JPanel jContentPane = null;
public JLabel jLabel = null;
public JLabel jLabel1 = null;
public JLabel LabelTemp = null;
public JLabel LabelOdczuwalna = null;
public JPanel jPanel = null;
public Okienko(double temperatura, double odczuwalna, String adres) throws MalformedURLException
{
super();
initialize(temperatura, odczuwalna, adres);
}
public void initialize(double temperatura, double odczuwalna, String adres) throws MalformedURLException
{
this.setLocation(350, 250);
this.setSize(350, 350);
this.setContentPane(getJContentPane(temperatura, odczuwalna,adres));
this.setTitle("Pogoda");
this.setResizable(false); // jesli damy na true bedziemy mogli zmienic rozmiar naszego okienka
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public JPanel getJContentPane(double temperatura, double odczuwalna, String adres) throws MalformedURLException
{
if (jContentPane == null)
{
LabelOdczuwalna = new JLabel();
LabelOdczuwalna.setBounds(new Rectangle(200, 50, 100, 20));
odczuwalna *=100;
int pomoc=(int) odczuwalna;
odczuwalna = ((double)pomoc)/100;
LabelOdczuwalna.setText("" + odczuwalna + " °C");
LabelTemp = new JLabel();
LabelTemp.setBounds(new Rectangle(200, 10, 100, 20));
temperatura *=100;
pomoc = (int)temperatura;
temperatura = ((double)pomoc)/100;
LabelTemp.setText("" + temperatura + " °C");
jLabel1 = new JLabel();
jLabel1.setBounds(new Rectangle(5, 50, 300, 20));
jLabel1.setText("Temperatura odczuwalna");
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(5, 10, 300, 20));
jLabel.setText(" Aktualna temperatura ");
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(jLabel, null);
jContentPane.add(jLabel1, null);
jContentPane.add(LabelTemp, null);
jContentPane.add(LabelOdczuwalna, null);
jContentPane.add(getJPanel(adres), null);
}
return jContentPane;
}
public JPanel getJPanel(String adres) throws MalformedURLException
{
if (jPanel == null)
{
jPanel = new JPanel();
jPanel.setLayout(new GridBagLayout());
jPanel.setBounds(new Rectangle(75, 100, 150, 150));
}
java.net.URL where = new URL(adres);
ImageIcon icon = new ImageIcon(where);
JLabel pomocnik = new JLabel();
pomocnik.setIcon(icon);
jPanel.add(pomocnik);
return jPanel;
}
package pogoda;
/**
*
* @author mateusz
*/
import com.sun.corba.se.impl.logging.OMGSystemException;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import java.net.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.*;
public class Pogoda
{
public int counter = 1;
public static String linia1 =
"<span class=\"twc-forecast-when twc-none\">Right Now</span>";
public static String linia11 =
"<img src=\""+
".+"+
"\" alt=";
public static String linia2 =
"<td class=\"twc-col-1 twc-forecast-temperature\"><strong>"+
"\\d+"+
"°F</strong></td>";
public static String linia3 =
"<td class=\"twc-col-1 twc-forecast-temperature-info\">Feels Like: <strong>"+
"\\d+"+
"°</strong>";
public static void main(String args[]) throws IOException
{
int temperatura =0;
int odczuwalna =0;
String adresObrazka="";
String help = "";
String linia = "";
URL strona = new URL("http://www.weather.com/weather/today/Wroclaw+Poland+PLXX0029");
URLConnection con = (URLConnection) strona.openConnection();
con.connect();
BufferedReader in = new BufferedReader(new InputStreamReader(strona.openStream()));
while((linia = in.readLine()) != null)
{
Pattern p = Pattern.compile(linia2);
Matcher m = p.matcher(linia);
if(m.find())
{
help = m.group().substring(55,m.group().length()-20);
temperatura = Integer.parseInt(help);
System.out.println(temperatura);
}
p = Pattern.compile(linia3);
m = p.matcher(linia);
if(m.find())
{
System.out.println("znaleziono odczuwalna");
help = m.group().substring(72,m.group().length()-14);
System.out.println(help);
odczuwalna=Integer.parseInt(help);
}
p = Pattern.compile(linia1);
m = p.matcher(linia);
if(m.find())
{
linia = in.readLine();
p = Pattern.compile(linia11);
m = p.matcher(linia);
if(m.find())
{
System.out.println("Pobrałem adres obrazka");
System.out.println(m.group().substring(10,m.group().length()-6));
adresObrazka = m.group().substring(10,m.group().length()-6);
}
}
}
double temperatura1 = temperatura;
double odczuwalna1 = odczuwalna;
odczuwalna1 = ((odczuwalna1-32)*5)/9;
temperatura1 = ((temperatura1-32)*5)/9;
System.out.println("Dane pobrane");
System.out.println("Temperatura " + temperatura1 + "\n Odczuwalna " + odczuwalna1 + "\n Adres obrazka " + adresObrazka);
Okienko o = new Okienko(temperatura1,odczuwalna1,adresObrazka);
o.setVisible(true);
o.jContentPane.setVisible(true);
}
}
最佳答案
从外观上看，该应用程序执行以下操作:
- 检索特定网页的内容
- 使用正则表达式从上述网页中检索特定数据
- 提取的项目之一是图像的 URL
- 该 URL 从未被验证为有效
- 有时 URL 无效并抛出 MalformedURLException
由于抓取的网页在应用程序外部，因此无法保证提取的 URL 存在、有效或与上周位于同一位置(无论正则表达式编写得如何)。只有一个解决方案，那就是优雅地失败(在这些情况下可能显示另一张图片)，并可选择通知应用程序维护者更新用于提取信息的正则表达式和/或网页。
关于java - MalformedURLException 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10465376/