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文件的输入输出的应用

2016-05-04 19:37 295 查看
1.使用字符输出流将一段文字存入文件,然后使用输入流读取文件中的内容。

public class main {
public static void main(String[] args) {
File file = new File("hello.txt");
String s;
Scanner r = new Scanner(System.in);
s = r.nextLine();
char b[] = s.toCharArray();
try {
FileWriter out = new FileWriter(file, true);
out.write(b);
out.close();
FileReader in = new FileReader(file);
int n = 0;
while ((n = in.read(b, 0, 2)) != -1) {
String str = new String(b, 0, n);
System.out.print(str);
}
} catch (IOException e) {
System.out.println(e);
}
}
}


2.将字符串加密后写入文件,然后读取该文件,并解密。

public class Main {
public static void main(String[] args) {
File file = new File("hello.txt");
String s;
Scanner r = new Scanner(System.in);
s = r.nextLine();
char b[] = s.toCharArray();
for (int i = 0; i < b.length; i++) {
if (b[i] >= 'x')
b[i] -= 23;
else
b[i] += 3;
}
try {
FileWriter out = new FileWriter(file, true);
out.write(b);
out.close();
FileReader in = new FileReader(file);
int n = 0;
while ((n = in.read(b, 0, 1)) != -1) {
String str = new String(b, 0, n);
char x[] = str.toCharArray();
if (x[0] <= 'c')
System.out.print((char)(x[0] + 23));
else
System.out.print((char)(x[0] - 3));
}
} catch (IOException e) {
System.out.println(e);
}
}
}
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