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一、在网上找了很多,对我的项目都没实现,我把网上说的两种合起来用就OK

java代码:

String id = request.getParameter("id");
	if(StringUtils.isNotEmpty(id)){
		SpmsBaseAnnexImpl annex = new SpmsBaseAnnexImpl();
		annex.setId(Long.valueOf(id));
		DatabaseUtil.expandEntity("default", annex);
		
		String path = annex.getAnnexPath();
		String name = annex.getAnnexName();
		String suff = annex.getAnnexSuff();
		if(StringUtils.isNotEmpty(path)){
			File file = new File(path);
			if(suff.endsWith("pdf")){
				response.setContentType("application/pdf");  
			}else{
				response.setContentType("multipart/form-data");  
			} 
			if(suff.endsWith("pdf")){
				response.setHeader("Content-Disposition", "fileName="+URLEncoder.encode(name, "utf-8")); 
			}else{
				response.setHeader("Content-Disposition", "attachment;fileName="+URLEncoder.encode(name, "utf-8")); 
			}
			OutputStream outp; 
			FileInputStream inputStream = new FileInputStream(file);
            outp = response.getOutputStream();  
  
            int len = 0;  
            byte[] buffer = new byte[1024];
            while ((len = inputStream.read(buffer)) > 0)
            	outp.write(buffer, 0, len);
            
            inputStream.close(); 
            outp.flush();  
            out.clear();
			out = pageContext.pushBody();
            outp.close();    
		}
	}

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