讀入

1. BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("D:/cplus/norm/norm/exp"), "UTF-8"));

2. BufferedReader br = new BufferedReader(new FileReader("file.txt"));

方法2不能設置解碼的編碼集，只能使用平臺默認的，有所限制。

寫入

1.?BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("t3"), "utf-8"));

2.?BufferedWriter bw = new BufferedWriter(new FileWriter("file.txt"));

3.?PrintWriter pw = new PrintWriter("t2","utf-8");

方法1的效率很高，但是輸出的方法只有bw.write,換行符只能用bw.newLine()

方法3除了效率有略微的差，相比方法1。優勢在于，簡單，可以pw.printf格式輸出，可以不寫try catch,可以直接println輸出根據平臺變化的換行符

方法3還有一個缺點是如果指定是追加模式，就不能指定編碼

fileWriter = new FileWriter(file,true);??
printWriter = new PrintWriter(fileWriter);??
printWriter.println(str);??

還是用方法1實現追加模式?BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("td", true), "utf-8"));

PrintWriter out = new PrintWriter(new OutputStreamWriter(

new FileOutputStream("exp.log"), "UTF-8"));
String line;
while ((line = in.readLine()) != null)
out.println(Normalizer.normalizeLine(line, langID, punct));

in.close();

out.close();

讀ascii碼文件，只用

BufferedReader groupFile = new BufferedReader(new FileReader(groupIn));
PrintStream fo = new PrintStream(new FileOutputStream(fileOut));

總結

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