java：如何将文件转换为utf8

java utf-8

2022-09-04 05:58:58

我有一个文件有一些非utf8 caracter（如“ISO-8859-1”），所以我想将该文件（或读取）转换为UTF8编码，我该怎么做？

代码是这样的：

File file = new File("some_file_with_non_utf8_characters.txt");

/* some code to convert the file to an utf8 file */

...

编辑：放置编码示例

答案 1

下面的代码将文件从 srcEncoding 转换为 tgtEncoding：

public static void transform(File source, String srcEncoding, File target, String tgtEncoding) throws IOException {
    BufferedReader br = null;
    BufferedWriter bw = null;
    try{
        br = new BufferedReader(new InputStreamReader(new FileInputStream(source),srcEncoding));
        bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(target), tgtEncoding));
        char[] buffer = new char[16384];
        int read;
        while ((read = br.read(buffer)) != -1)
            bw.write(buffer, 0, read);
    } finally {
        try {
            if (br != null)
                br.close();
        } finally {
            if (bw != null)
                bw.close();
        }
    }
}

--编辑--

使用 Try-with-resources （Java 7）：

public static void transform(File source, String srcEncoding, File target, String tgtEncoding) throws IOException {
    try (
      BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(source), srcEncoding));
      BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(target), tgtEncoding)); ) {
          char[] buffer = new char[16384];
          int read;
          while ((read = br.read(buffer)) != -1)
              bw.write(buffer, 0, read);
    } 
}

答案 2

  String charset = "ISO-8859-1"; // or what corresponds
  BufferedReader in = new BufferedReader( 
      new InputStreamReader (new FileInputStream(file), charset));
  String line;
  while( (line = in.readLine()) != null) { 
    ....
  }

在那里，您可以解码文本。您可以通过simmetric Writer/OutputStream方法使用您喜欢的编码（例如UTF-8）编写它。