Java读取文件-编程知识

Java读取文件

读取文件为String 、访问链接直接跳转html

环境：SpringMVC 、前端jsp

InputStreamReader

        FileInputStream fileInputStream = new FileInputStream(formatFile.getHtmlpath());InputStreamReader reader = new InputStreamReader(fileInputStream, StandardCharsets.UTF_8);char[] b = new char[1024];int cnt = 0;StringBuilder sb = new StringBuilder();while((cnt = reader.read(b,0,b.length)) != -1){sb.append(b.toString());}

结果：能读取出来，不乱码，但是字符中间多了逗号
在这里插入图片描述

BufferedReader

 @RequestMapping("/xxx/yyy")public ResponseEntity<String> markReportHtml(@RequestParam(value = "id") Integer id) throws IOException {HttpHeaders httpHeaders = new HttpHeaders();httpHeaders.set("Content-Type","text/html;charset=UTF-8");F f = fDao.selectById(id);if(f == null || StringUtils.isEmpty(f.getHtmlpath())){return new ResponseEntity<>("<html><div>未查询到数据</div></html>",httpHeaders, HttpStatus.CONFLICT);}StringBuilder sb = new StringBuilder();BufferedReader br=new BufferedReader(new InputStreamReader(Files.newInputStream(Paths.get(formatFile.getHtmlpath())), StandardCharsets.UTF_8));String line;while ((line = br.readLine())!=null) {sb.append(line);}return new ResponseEntity<>(sb.toString(), httpHeaders, HttpStatus.OK);}