java按指定编码写入和读取文件内容_java file按照指定编码读写-优快云博客

本文链接：https://blog.youkuaiyun.com/ForeverDWYW/article/details/77868757

本文介绍了如何在Java中使用指定编码（如UTF-8）进行文件的读写操作，以避免出现乱码问题。提供了读取文件内容到List、将List写入文件以及根据字符串生成指定编码文件的方法。

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可以指定编码如：utf-8来写入和读取文件。如果文件编码未知，可以通过该方法先得到文件的编码后再指定正确的编码来读取，否则会出现文件乱码问题。

public class ReadWriteFileWithEncode {

    public static void main(String[] args)throws IOException {
        String content = "中文内容";
        String path ="c:/test.txt";
        String encoding = "utf-8";
       ReadWriteFileWithEncode.write(path,content, encoding);

System.out.println(ReadWriteFileWithEncode.read(path, encoding));

       File file = newFile("D:\\FACE_LIST\\TOSMIS_FACE_ALL_LIST.txt");//读取文件内容到List中
       List<String> ls =read(file.getPath(), "UTF-8");
       for (String line : ls) {
           String[] cols =StringUtils.splitPreserveAllTokens(line,Constants.SUF_PAD);
           System.out.println("解析数据:"+cols[0]);
       }

    }
    /*把数据写入到文件File中*/
    public static void write(String path, String content, Stringencoding) throws IOException {
        File file = new File(path);
        file.delete();
        file.createNewFile();
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), encoding));
        writer.write(content);
        writer.close();
    }
   /*从文件File中读取数据到字符串里*/
    public static List<String> read(String path,String encoding) throws IOException {
       List<String> ls = newLinkedList<String>();
        String content = "";
        File file = new File(path);
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), encoding));
        String line = null;
        while ((line = reader.readLine()) !=null) {
           ls.add(line+"\n");
        }
        reader.close();
        return ls;

}

/*根据组织好的字符串String生成,指定格式'UTF-8'文件*/

   public static void genFile(StringfileName, StringBuffer content) throws IOException {
       File file = new File(fileName);
       // 文件夹是否存在，不存在则创建
       String path =StringUtils.substringBeforeLast(fileName, "\\");
       File dir = new File(path);
       if (!dir.exists()) {
           org.apache.commons.io.FileUtils.forceMkdir(dir);
       }
       if (!file.exists()) {
           file.createNewFile();
       }
       org.apache.commons.io.FileUtils.writeStringToFile(file,content.toString(), "UTF-8");
       content = null;
   }