解决乱码:自定义io流读写编码,读写不同编码的文件

概述

      利用io流读写文件时,默认的流编码都是UTF-8,d但是如果流的编码和文件的编码不一样,得到的内容是乱码.所幸的是字节流可以在转为String使用new String(byte[],charset)设置编码.字符流InputStreamReader,OutputStreamWriter这两个类的构造方法提供了设置流编码的方法.

下面举个简单的例子,其他情况可以举一反三.

读取的文件是GBK编码,写入的文件是UTF-8编码

@Test
public void test4(){
    BufferedWriter bufferedWriter = null;
    BufferedReader bufferedReader = null;
    try {
        bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream("G://20180920.txt"),"GBK"));
        //开始写入内容
        bufferedWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("G://bz20180920.txt"),"UTF-8"));
        String line,poundage;
        String separator = "|";
        StringBuilder sb;
        while ((line = bufferedReader.readLine()) != null) {
            String[] contents = line.split("\\|");
            poundage = contents[7];
            while (poundage.length() != 12){
                poundage = "0" + poundage;
            }
            sb = new StringBuilder();
            sb.append(contents[0]).append(separator)
                    .append(contents[8]).append(separator)
                    .append(contents[2]).append(separator)
                    .append(getStatus(contents[10])).append(separator)
                    .append(getStatus(contents[10])).append(separator)
                    .append(contents[11]).append(separator)
                    .append("DIS").append(separator)
                    .append("OT001").append(separator)
                    .append(separator)
                    .append("F01").append(separator)
                    .append(poundage).append(separator)
                    .append(separator)
                    .append(separator)
                    .append(separator)
                    .append(separator)
                    .append(separator)
                    .append("\r\n");
            bufferedWriter.write(sb.toString());
            bufferedWriter.flush();
        } 
    }catch (Exception e) {
        log.error("处理的文件发生异常:{}", e);
    } finally {
        if (bufferedWriter != null) {
            try {
                bufferedWriter.close();
            } catch (IOException e) {
                log.error("关闭输出流异常:{}", e);
            }
        }
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                log.error("关闭读取流异常:{}", e);
            }
        }
    }
}
private String getStatus(String s) {
    if ("SUCCESS".equals(s)){
        return "000";
    }
    return "020";
}