java 实现在线阅读 .pdf

1.资源的本地地址

2.设置响应头

3.代码实现

 1 @ResponseBody
 2     @RequestMapping(value = "/read")
 3     @ApiOperation(value="阅读", httpMethod = "GET", notes = "阅读")
 4     public String read(@ApiParam(required = true, name="id", value="")@RequestParam(value="id", required=true)String id,
 5                        HttpServletRequest request,HttpServletResponse response) throws IOException {
 6         PeriodicalResource periodicalResource = periodicalResourceService.get(id);
 7         String filePath = periodicalResource.getAttachment();
 8         File file = new File(periodicalBaseDir + filePath);//本地资源位置
 9         if (file.exists()) {
10             response.setContentType("text/html; charset=UTF-8");//文本&编码
11             response.setContentType("application/pdf");//pdf
12             byte[] buffer = new byte[16*1024];
13             FileInputStream fis = null;
14             BufferedInputStream bis = null;
15             try {
16                 fis = new FileInputStream(file);
17                 bis = new BufferedInputStream(fis);
18                 OutputStream os = response.getOutputStream();
19                 int i = bis.read(buffer);
20                 while (i != -1) {
21                     os.write(buffer, 0, i);
22                     i = bis.read(buffer);
23                 }
24             } catch (Exception e) {
25                 e.printStackTrace();
26             } finally {
27                 if (bis != null) {
28                     try {
29                         bis.close();
30                     } catch (IOException e) {
31                         e.printStackTrace();
32                     }
33                 }
34                 if (fis != null) {
35                     try {
36                         fis.close();
37                     } catch (IOException e) {
38                         e.printStackTrace();
39                     }
40                 }
41             }
42         }
43         return null;
44     }

4.总结一下经验记录一下实现过程

虽然实现但是自己还是很懵逼，主要涉及的技术有 IO流，File 文件两大技术

　　在学校时，总感觉自己萌萌哒，结果工作之后自己咻咻咻，还要学习的东西很多啦

希望自己的建议可以帮助各位道友加油一直在路上