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    public HttpServletResponse download(String path, HttpServletResponse response) {  
        try {  
            // pathÊÇÖ¸ÓûÏÂÔØµÄÎļþµÄ·¾¶¡£  
            File file = new File(path);  
            // È¡µÃÎļþÃû¡£  
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            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();  
 
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import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
public class TestDesktop {
public static void main(String[] a) {
try {
Desktop desktop = null;
if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}
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