java 基本的檔案讀寫

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不能設定解碼的編碼集，只能使用平台預設的，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。優勢在於，簡單，可以pw.printf格式輸出，可以不寫try catch,可以直接println輸出根據平台變化的換行符

方法3還有乙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碼檔案，只用

bufferedreader groupfile = new bufferedreader(new filereader(groupin));

printstream fo = new printstream(new fileoutputstream(fileout));

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