我试图使用小程序将剪贴板中的图像粘贴到我的网站中。我发现这个网站设法做到了。他们在这里展示了演示。我从这里下载了项目，PasteImageApplet.zip。我尝试在本地运行该文件，发现该小程序未按照演示加载。下面是html和applet类。
HTML
<html>
<head>
<title>Clipboard image demo</title>
<script type="text/javascript">
function loadApplet() {
// Deferred load to display text first
document.getElementById("applet").innerHTML = '<object id="paste-image" classid="java:PasteImageApplet.class" type="application/x-java-applet" archive="tst.jar" width="1" height="1"></object>';
}
function getImage() {
obj = document.getElementById('paste-image');
postTo = "http://your-domain/path/to/shoot.php"; // Change this to your URL
image = obj.getClipboardImageURL(postTo);
if (image) {
url = "shots/" + image;
document.getElementById("target").src = url;
document.getElementById("url").value = document.getElementById("target").src; // to get full path, hack, I know ;)
document.getElementById("container").style.display = "";
}
}
</script>
<body onload="loadApplet();">
<p>
Copy some image data to your clipboard, accept the applet (it only accesses the clipboard) and click the button :-)
<a href="http://lassebunk.dk/2009/07/19/using-the-clipboard-to-post-images/">See a blog post about this demo</a>
</p>
<p>
<div id="applet"></div>
<input type="button" value="Paste it!" onclick="getImage();">
</p>
<div id="container" style="display: none;">
<input type="text" id="url" style="width: 700px;"><br />
<iframe id="target" width="700" height="400"></iframe>
</div>
</body>
</html>
小程序
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.Toolkit;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import javax.swing.JApplet;
import javax.swing.JOptionPane;
import javax.swing.ImageIcon;
import java.io.ByteArrayOutputStream;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import java.net.URL;
import java.net.URLConnection;
import java.io.InputStream;
import javax.swing.JLabel;
public class PasteImageApplet extends JApplet{
Clipboard clipboard;
Toolkit toolkit;
JLabel lbl;
public String getClipboardImageURL(String server){
lbl.setText("pasting image");
String url = "";
try{
DataFlavor dataFlavor = DataFlavor.imageFlavor;
System.out.println(dataFlavor.getDefaultRepresentationClass());
Object object = null;
try{
object = clipboard.getContents(null).getTransferData(dataFlavor);
}catch (Exception e){
JOptionPane.showMessageDialog(null, "No image found.");
return "";
}
BufferedImage img = (BufferedImage) object;
BufferedImage bimg = null;
int w = img.getWidth(null);
int h = img.getHeight(null);
bimg = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
ImageIcon ii = new ImageIcon(img);
ImageObserver is = ii.getImageObserver();
bimg.getGraphics().setColor(new Color(255, 255, 255));
bimg.getGraphics().fillRect(0, 0, w, h);
bimg.getGraphics().drawImage(ii.getImage(), 0, 0, is);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(stream);
jpeg.encode(bimg);
URL u = new URL(server);
URLConnection con = u.openConnection();
//String boundary = "-----------------------------7d637a1aa100de";
con.setDoOutput(true);
con.getOutputStream().write(stream.toByteArray());
/*con.getOutputStream().write(((String)
"--"+boundary+"\r\n "+
"Content-Disposition: form-data; name=\"img\"; filename=\"filename\"\r\n"+
"Content-Type: image/jpeg\r\n "+
"Content-Transfer-Encoding: base64\r\n\r\n" +
Base64.encodeBytes(stream.toByteArray())).getBytes());*/
con.connect();
InputStream inputStream = con.getInputStream();
byte [] urlBytes = new byte [inputStream.available()];
inputStream.read(urlBytes);
url = new String(urlBytes);
System.out.print(url);
lbl.setText("image pasted");
} catch (Exception exc){
lbl.setText("an error occurred: " + exc.getMessage());
/*if (ShowExceptions.ShowExceptions)
exc.printStackTrace();*/
}
return url;
}
public void init() {
lbl = new JLabel("");
lbl.setText("applet started");
add(lbl);
toolkit = Toolkit.getDefaultToolkit();
clipboard = toolkit.getSystemClipboard();
}
}
如果有人可以就此提出建议，我将不胜感激。