java utf-8 文件的读写

场景：

将UTF-8编码的模版文件读入内存，然后转换后存储为html文件。

 

注意点：

utf-8编码的文件开头有3个附加字节：0xEF 0xBB 0xBF

unicode编码的文件开头有2个附加字节：0xFF 0xFE (little endian)，或者0xFE 0xFF(big endian)

ANSI编码则没有附加字节

如果读写不当， 可能得不到预期结果（html会显示为乱码）

 

读示例：

 String readFile(String utf8File) {Reader streamReader = new InputStreamReader(new FileInputStream(utf8File), "UTF-8");Reader reader = new BufferedReader(streamReader);String line = null;StringBuilder text = new StringBuilder(); while ((line = reader.readLine()) != null) { text.append(line);} reader.close();return text.toString();}

 

 

写示例：

String template = readFile("c://utf8.template");String outputFile = "c://utf8.htm";Writer writer = new PrintWriter( new OutputStreamWriter(new FileOutputStream(outputFile), "UTF-8"));template = template.replace("$title$", "UTF-8 read and write");writer.write(template);writer.close();