java加密不能加密任何字符串？

Question

我已经制作了加密和解密类，现在我想测试它。 加密器shold采用som文本并将其加密为.txt文件。但它不起作用。

public class Encryption extends FilterWriter{
private static int INKREMENT = 3;

protected Encryption(Writer arg0) {
    super(arg0);
}

public void write(String str, int off, int len) throws IOException{
    String result = str.substring(0,off);
    for(int i = off; i<len+off; i++){
        result += (char) ((int) str.charAt(i)+ INKREMENT);
    }
    result += str.substring(off+len);
    out.write(result);
}
public void write(int c) throws IOException{
        out.write(c + INKREMENT);


}
public void write(char[] cbuf, int off, int len) throws IOException{
    for(int i = off; i < len + off; i++){
        cbuf[i] = (char)((int) cbuf[i] + INKREMENT);
    }
    out.write(cbuf,off,len);
}

}

我的考试？我不知道写什么来获取字符串加密并保存在text.txt文件中

Writer out = new Encryption(new BufferedWriter(new FileWriter("text.txt")));

Answer 1

请参阅javax.crypto.CipherOutputStream。它已经完成了。