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    public HttpServletResponse download(String path, HttpServletResponse response) {  
        try {  
            // pathÊÇÖ¸ÓûÏÂÔØµÄÎļþµÄ·¾¶¡£  
            File file = new File(path);  
            // È¡µÃÎļþÃû¡£  
            String filename = file.getName();  
            // È¡µÃÎļþµÄºó׺Ãû¡£  
            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();  
 
            // ÒÔÁ÷µÄÐÎʽÏÂÔØÎļþ¡£  
            InputStream fis = new BufferedInputStream(new FileInputStream(path));  
            byte[] buffer = new byte[fis.available()];  
            fis.read(buffer);  
            fis.close();  
            // Çå¿Õresponse  
            response.reset();  
            // ÉèÖÃresponseµÄHeader  
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));  
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JAVA ÖÐURLÁ´½ÓÖÐÎIJÎÊýÂÒÂëµÄÈô¸É´¦Àí·½·¨£¬ÏÖÔÚÕûÀíÊÕ¼ÈçÏÂ:
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String strPtname = request.getParameter("ptname");
strPtname = new String(strPtname.getBytes("ISO-8859-1"), "UTF-8");  
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package cn.bupt.duming.util;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
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