Java通过Http请求服务器，返回EXCEL/TXT预览页面出现中文乱码解决办法

遇到的问题是：

通过java请求服务器，在文件中心拿到文件EXCEL或者txt，返回到前端直接预览查看内容出现中文乱码

例如：

public void viewFile(){

    HttpServletResponse response = ((ServletRequestAttributes)RequestContexHolder.currentRequestAttributes()).getResponse();

    byte[] bytes = this.downloadFromFC();

    try(InputStream inputStream = new ByteArrayInputStream(bytes)){

        ExcelToHtmlParams params = new ExcelToHtmlParams(WorkBookFactory.create(inputStream));

        response.getOutputStream().write(ExcelXorHtmlUtil.excelToHtml(params).getBytes());

        response.setContentType("text/html");    

    }catch(Exception e){  

    }

}

解决的方法：

①更改编码为UTF-8

②注意代码编码顺序（极易忽略的问题，先声明编码，再写流）

public void viewFile(){

    HttpServletResponse response = ((ServletRequestAttributes)RequestContexHolder.currentRequestAttributes()).getResponse();

    byte[] bytes = this.downloadFromFC();

    try(InputStream inputStream = new ByteArrayInputStream(bytes)){

        response.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");    

        ExcelToHtmlParams params = new ExcelToHtmlParams(WorkBookFactory.create(inputStream));

        response.getOutputStream().write(ExcelXorHtmlUtil.excelToHtml(params).getBytes());

    }catch(Exception e){  

    }

}