class path resource [api.pdf] cannot be opened because it does not exist

1、代码

　　

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public void downloadApiDoc(HttpServletResponse response) {         ClassPathResource classPathResource = new ClassPathResource("api.pdf");         try (InputStream inputStream = classPathResource.getInputStream()){             //得到文件大小             int size =inputStream.available();             byte[] data =new byte[size];             //读数据             inputStream.read(data);             inputStream.close();             response.reset();             //设置返回的文件类型             response.setContentType("application/pdf");             response.setHeader("Content-disposition", "inline; filename=Api_Doc.pdf");             response.setContentLength(size);             OutputStream os = response.getOutputStream();             os.write(data);         } catch (IOException e) {             e.printStackTrace();             log.info("download api doc");         }     }

　　

2、原因：使用的classpath，虽然resources下有文件大门时traget的class下没有文件所有找不到

　　　　

 

 

3、解决：重新build一下