Java實現(xiàn)PDF在線預(yù)覽
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
@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年上半年英語四級筆試準考證(戴林峰).pdf"); // 文件名應(yīng)該編碼成utf-8，注意：使用時，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年上半年英語四級筆試準考證(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快捷實現(xiàn)PDF在線預(yù)覽
本文章利用各個瀏覽器的內(nèi)核支持PDF預(yù)覽功能來做，PDF的預(yù)覽網(wǎng)上說的最多的是PDF.JS實現(xiàn)預(yù)覽，也找了好多文章，死活最后實現(xiàn)不了，通過這個方法解決了，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。可以網(wǎng)上搜下。
方法很簡單，首先引入的都是IO的包。
|
1
2
3
4
|
import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;import org.apache.commons.io.IOUtils; |
接下來就是在自己的后臺controller里面寫個方法。里面file的文件可以通過參數(shù)或是封裝方式獲取，這個里面的流不需要關(guān)閉，瀏覽器會自動獲取然后展示。關(guān)閉的話瀏覽器就無法加載！
|
1
2
3
4
5
6
7
8
9
10
11
12
|
@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(); } } |
文章來源：從其他各個文章中測試驗證，取得最優(yōu)方案。
以上為個人經(jīng)驗，希望能給大家一個參考，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
