package com.javaweb.cms.service.impl;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
public class FileServiceImpl {
	 public void logDownload(String name, HttpServletResponse response) throws Exception {
	        File file = new File("logs" + File.separator + name);

	        if (!file.exists()) {
	            System.out.println("文件不存在");
	        }
	        response.setContentType("application/force-download");
	        response.addHeader("Content-Disposition", "attachment;fileName=" + name);

	        byte[] buffer = new byte[1024];
	        try (FileInputStream fis = new FileInputStream(file);
	                      BufferedInputStream bis = new BufferedInputStream(fis)) {

	            OutputStream os = response.getOutputStream();

	            int i = bis.read(buffer);
	            while (i != -1) {
	                os.write(buffer, 0, i);
	                i = bis.read(buffer);
	            }
	        }
	    }

}