java实现文件预览功能,java在线预览文件

package com.exportpdf;import java.io.File;import java.io.FileInputStream;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;/** * @author TANGSHUAI * @date 2020年12月29日 下午9:01:25 * */@Controller@RequestMapping("pdf")public class PreViewPdfController {@RequestMapping(value = "preView")public void preView(HttpServletResponse response){ File file = new File("D:\PPT\001.jpg"); if (file.exists()){ byte[] data = null; try { FileInputStream input = new FileInputStream(file); data = new byte[input.available()]; input.read(data); response.getOutputStream().write(data); input.close(); } catch (Exception e) { System.out.println(e); } }else{ return; } }}