Java實(shí)現(xiàn)PDF在線預(yù)覽
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@RequestMapping("/preview1")public void er(HttpServletResponse response){ File file = new File("G:\\桌面\\Thymeleaf3.0中文翻譯文檔@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中文翻譯文檔@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中文翻譯文檔@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中文翻譯文檔@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) { // 在線打開方式 URL u = new URL("file:///" + filePath); String contentType = u.openConnection().getContentType(); response.setContentType(contentType); response.setHeader("Content-Disposition", "inline;filename=" + "2019年上半年英語(yǔ)四級(jí)筆試準(zhǔn)考證(戴林峰).pdf"); // 文件名應(yīng)該編碼成utf-8，注意：使用時(shí)，我們可忽略這句 } else { // 純下載方式 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment;filename=" + "2019年上半年英語(yǔ)四級(jí)筆試準(zhǔn)考證(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快捷實(shí)現(xiàn)PDF在線預(yù)覽
本文章利用各個(gè)瀏覽器的內(nèi)核支持PDF預(yù)覽功能來(lái)做，PDF的預(yù)覽網(wǎng)上說(shuō)的最多的是PDF.JS實(shí)現(xiàn)預(yù)覽，也找了好多文章，死活最后實(shí)現(xiàn)不了，通過這個(gè)方法解決了，如果有PDF.js解決的可以大家溝通交流下。
這里提一下，其他word和excel可以通過aspose代碼轉(zhuǎn)換成PDF，也很快有效?？梢跃W(wǎng)上搜下。
方法很簡(jiǎn)單，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; |
接下來(lái)就是在自己的后臺(tái)controller里面寫個(gè)方法。里面file的文件可以通過參數(shù)或是封裝方式獲取，這個(gè)里面的流不需要關(guān)閉，瀏覽器會(huì)自動(dòng)獲取然后展示。關(guān)閉的話瀏覽器就無(wú)法加載！
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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(); } } |
文章來(lái)源：從其他各個(gè)文章中測(cè)試驗(yàn)證，取得最優(yōu)方案。
以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持服務(wù)器之家。
原文鏈接：https://blog.csdn.net/qq_39992641/article/details/96881552
