spring文件异步下载EXCEL示例

index.jsp 页面：

 <input type="button" onclick="javascript:download();" value="点击下载"/>
 function download(){
             var url="<c:out value="${pageContext.request.contextPath}" />/file.do?method=download";    
             window.open(url);  
             return false ;
        }

后台action代码：

public void download(HttpServletRequest request,
            HttpServletResponse response) {
        
                
        try {
            response.setContentType("application/vnd.ms-excel");//这里指定是excel格式
            String path = request.getSession().getServletContext().getRealPath("WEB-INF/download/");//得到上传服务器的路径
            path = path+"\"+filename; //这里的文件名称是注入进来的
            File file = new File(path);
            
            response.reset();
            response.setHeader("Content-Disposition", "attachment;fileName="+new String(filename.getBytes("UTF-8"),"iso-8859-1"));
        
            InputStream in = new BufferedInputStream(new FileInputStream(file));
            byte[] buffer = new byte[in.available()];
            in.read(buffer);
            in.close();
            
            OutputStream out = new BufferedOutputStream(response.getOutputStream());
            out.write(buffer);
            out.flush();
            out.close();
        
        } catch (Exception e) {
            e.printStackTrace();
        }     //下载文件名称
    
    
    }