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java讀取檔案内容,部分中文亂碼問題

項目中需要對已上傳的文本檔案實作預覽操作,發現中文預覽部分亂碼,出現亂碼的代碼如下:

StringBuffer content = new StringBuffer();
        try (FtpTemplate template = ftpTemplateFactory.createAndConnect()) {
            InputStream inputStream = template.retrieveFileStream(filePath);
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = inputStream.read(buf)) != -1) {
                content.append(new String(buf, 0, length));
            }
        } catch (IOException e) {
            e.printStackTrace();
            LOG.error("擷取ftp檔案輸入流異常", e);
            throw new BizException("擷取ftp檔案輸入流異常");
        }
           

由于中文字元按照byte讀取再拼接會出現亂碼問題,拷貝檔案不會,是以就會出現部分中文資訊亂碼

解決方案:使用bufferedReader 的readLine方法讀取整行,加"\n"換行

在這裡插入代碼片 StringBuffer content = new StringBuffer();
        try (FtpTemplate template = ftpTemplateFactory.createAndConnect()) {
            InputStream inputStream = template.retrieveFileStream(filePath);
            Reader reader = new InputStreamReader(inputStream);

            try(BufferedReader bufferedReader = new BufferedReader(reader)){
                String read;
                while ((read = bufferedReader.readLine())!=null){
                    content.append(read+"\n");
                }
            }catch (Exception e){
                LOG.error("讀取檔案異常!", e);
                throw new BizException("讀取檔案異常!");
            }

        } catch (Exception e) {
            e.printStackTrace();
            LOG.error("擷取ftp檔案輸入流異常", e);
            throw new BizException("擷取ftp檔案輸入流異常");
        }```