Java中的字符型文件流FileReader和FileWriter详细解读

    public static void main(String[] args) {
        File file = new File("F:\\test\\Test.txt");
        FileReader fr = null;
        try {
            fr = new FileReader(file);
            char[] chars = new char[10];//每次读取5个字符
            int count = fr.read(chars);
            
            while (count!=-1){
                String s = new String(chars, 0, count);
                System.out.println(s);
                count = fr.read(chars);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if (fr!=null){
                try {
                    fr.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) {
        File file = new File("F:\\test\\log.txt");
        //log.txt可以不存在，test文件夹必须存在

        FileWriter fw = null;
        try {
            fw = new FileWriter(file,true);//要追加写入数据
            String str = "文字是人类用表义符号记录表达信息，使之传之久远的方式和工具。现代文字大多是记录语言的工具。人类往往先有口头的语言后产生书面文字，很多方言和小语种，有语言但没有文字。文字的不同体现了国家和民族的书面表达的方式和思维不同。文字使人类进入有历史记录的文明社会。\n" +
                    "Text is a way and tool for human beings to record and express information by means of symbolic meaning.Modern writing is mostly a tool for recording language.Humans tend to have spoken languages before they have written languages, many dialects and smaller languages that have languages but no words.The different characters reflect the different ways and thinking of the written expression of the country and nation.Writing enabled mankind to enter a civilization with a historical record.";
            char[] chars = str.toCharArray();
            fw.write(chars);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if (fw!=null){
                try {
                    fw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }