数据文件比较大的时候，如果整体copy会处出现内存不足的情况，所以采用流的方式。 使用时候请自觉关闭流，临时工具demo，不再做演示。
private static void codeTransformByFileBuffer() throws IOException { //GBK编码格式源码路径 String infilePath = "E:\\人工智能\\人工智能-语言处理\\news_tensite_xml.full\\gbk\\news_tensite_xml.dat"; //转为UTF-8编码格式源码路径 String outfilePath = "E:\\人工智能\\人工智能-语言处理\\news_tensite_xml.full\\utf8\\corpus.txt"; FileInputStream fileInputStream = new FileInputStream(new File(infilePath)); BufferedReader reader = new BufferedReader(new InputStreamReader(fileInputStream,"gbk")); FileOutputStream fileOutputStream = new FileOutputStream(new File(outfilePath)); BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(fileOutputStream, StandardCharsets.UTF_8)); while (reader.ready()){ String readLine = reader.readLine(); if (StringUtils.startsWith(readLine,"<content>")){ System.out.println(readLine); bufferedWriter.write(readLine); } } System.out.println("传输完毕"); }