文件下载

web文件下载

package download.util;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class DownLoadJFrame extends JFrame {
	// 声明组件
	private JLabel downLoadJLable;
	private JTextField downLoadJTextField;
	private JButton downLoadJButton;
	public DownLoadJFrame() {
		// 设置标题
		super("下载工具");
		// 设置大小
		this.setSize(450, 300);
		// 设置居中显示
		this.setLocationRelativeTo(null);
		// 设置窗体关闭即退出程序
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		// 获取容器对象
		Container c = this.getContentPane();
		// 设置容器面板布局为null
		c.setLayout(null);
		// 实例化组件
		downLoadJLable = new JLabel("下载的地址:");
		downLoadJTextField = new JTextField(
				"http://172.22.64.103:8080/day01/images/3.jpg");

		downLoadJButton = new JButton("下载");
		// 设置组件的位置
		downLoadJLable.setBounds(10, 20, 80, 30);
		downLoadJTextField.setBounds(95, 20, 280, 30);
		downLoadJButton.setBounds(120, 100, 100, 30);
		// 添加到面板中
		c.add(downLoadJLable);
		c.add(downLoadJTextField);
		c.add(downLoadJButton);

		// 添加点击事件
		downLoadJButton.addActionListener(new MyActionLis());
		// 设置窗体可见
		this.setVisible(true);
	}

	public static void main(String[] args) {
		new DownLoadJFrame();
	}

	/**
	 * 内部类
	 * 
	 * @author XinFei
	 * 
	 */
	class MyActionLis implements ActionListener {

		@Override
		public void actionPerformed(ActionEvent e) {
			downLoadJButton.setEnabled(false);
			System.out.println("bbbb");

			try {
				// 创建连接的URL对象
				URL url = new URL(downLoadJTextField.getText());
				// 打开连接
				HttpURLConnection urlConn = (HttpURLConnection) url
						.openConnection();
				// 获取输入流对象
				InputStream is = urlConn.getInputStream();
				// 写出的文件
				File file = new File("F:\\ss.jpg");
				// 输出流对象
				OutputStream os = new FileOutputStream(file);
				int len = 0;
				byte buffer[] = new byte[1023];
				while ((len = is.read(buffer)) != -1) {
					os.write(buffer, 0, len);
				}
				is.close();
				os.flush();
				os.close();
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}

	}
}