Java读取文件-优快云博客

本文链接：https://blog.youkuaiyun.com/watermelonmelon_/article/details/136403981

文章讲述了在SpringMVC环境中，通过InputStreamReader读取文件并解决乱码问题，以及使用BufferedReader实现无刷新跳转HTML页面的方法。两种方式分别展示了如何正确处理文件内容和HTTP响应头以满足前端请求。

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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);
    }