Java实现PDF在线预览
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@RequestMapping("/preview1")public void er(HttpServletResponse response){ File file = new File("G:\\桌面\\Thymeleaf3.0中文翻译文档@www.java1234.com.pdf"); 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; }}@ResponseBody@RequestMapping("/preview2")public void findPdf( HttpServletResponse response) throws IOException{ response.setContentType("application/pdf"); FileInputStream in = new FileInputStream(new File("G:\\桌面\\Thymeleaf3.0中文翻译文档@www.java1234.com.pdf")); OutputStream out = response.getOutputStream(); byte[] b = new byte[512]; while ((in.read(b))!=-1) { out.write(b); } out.flush(); in.close(); out.close();}@ResponseBody@RequestMapping("/preview3")public void devDoc(HttpServletRequest request, HttpServletResponse response, String storeName) throws Exception { request.setCharacterEncoding("UTF-8"); String ctxPath = request.getSession().getServletContext().getRealPath(""); String downLoadPath = "G:\\桌面\\Thymeleaf3.0中文翻译文档@www.java1234.com.pdf"; response.setContentType("application/pdf"); FileInputStream in = new FileInputStream(new File(downLoadPath)); OutputStream out = response.getOutputStream(); byte[] b = new byte[1024]; while ((in.read(b))!=-1) { out.write(b); } out.flush(); in.close(); out.close();}@ResponseBody@RequestMapping("/preview")public void download( HttpServletResponse response ) throws IOException { String filePath = "G:\\桌面\\Thymeleaf3.0中文翻译文档@www.java1234.com.pdf"; System.out.println("filePath:" + filePath); File f = new File(filePath); if (!f.exists()) { response.sendError(404, "File not found!"); return; } BufferedInputStream br = new BufferedInputStream(new FileInputStream(f)); byte[] bs = new byte[1024]; int len = 0; response.reset(); // 非常重要 if (true) { // 在线打开方式 URL u = new URL("file:///" + filePath); String contentType = u.openConnection().getContentType(); response.setContentType(contentType); response.setHeader("Content-Disposition", "inline;filename=" + "2019年上半年英语四级笔试准考证(戴林峰).pdf"); // 文件名应该编码成utf-8，注意：使用时，我们可忽略这句 } else { // 纯下载方式 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment;filename=" + "2019年上半年英语四级笔试准考证(戴林峰).pdf"); } OutputStream out = response.getOutputStream(); while ((len = br.read(bs)) > 0) { out.write(bs, 0, len); } out.flush(); out.close(); br.close();} |
Java快捷实现PDF在线预览
本文章利用各个浏览器的内核支持PDF预览功能来做，PDF的预览网上说的最多的是PDF.JS实现预览，也找了好多文章，死活最后实现不了，通过这个方法解决了，如果有PDF.js解决的可以大家沟通交流下。
这里提一下，其他word和excel可以通过aspose代码转换成PDF，也很快有效。可以网上搜下。
方法很简单，首先引入的都是IO的包。
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import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;import org.apache.commons.io.IOUtils; |
接下来就是在自己的后台controller里面写个方法。里面file的文件可以通过参数或是封装方式获取，这个里面的流不需要关闭，浏览器会自动获取然后展示。关闭的话浏览器就无法加载！
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@RequestMapping(value = "/showpdf") public void showpdf(HttpServletRequest request, HttpServletResponse response, Model model) { try { File file = new File("D:/xyptFile/java.pdf"); FileInputStream fileInputStream = new FileInputStream(file); response.setHeader("Content-Type", "application/pdf"); OutputStream outputStream = response.getOutputStream(); IOUtils.write(IOUtils.toByteArray(fileInputStream), outputStream); } catch(Exception e) { e.printStackTrace(); } } |
文章来源：从其他各个文章中测试验证，取得最优方案。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_39992641/article/details/96881552
