学了IO流，自己写了个图片加密 - 黑马程序员技术交流社区

import java.io.*<span style="line-height: 30.8px;">;</span>
import java.util.Scanner;
/**
*
* @author Wei_John
* @version 自用图片加密 2015.11.26
*/
public class Locker {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
System.out.println("*****************************************");
System.out.println("* 自用图片加密 *");
System.out.println("* 1.加密 *");
System.out.println("* 2.解锁 *");
System.out.println("* by Wei_John *");
System.out.println("*****************************************");
Scanner sc = new Scanner(System.in);
System.out.print("请输入: ");
String line = sc.nextLine();
//判断输入是否为1 和 2
while( ! line.matches("[12]")){
System.out.print("请输入: ");
line = sc.nextLine();
}
int x = Integer.valueOf(line);
if (x == 1) {
// 加密
Locked(getFile(), Lock(),0);
System.out.println("加密成功");
} else if (x == 2) {
// 解锁
UnLocked(getFile(), Lock());
System.out.println("解锁成功");
}
}
/**
* UnLocked
* @param file
* @param password
* @throws FileNotFoundException
* @throws IOException
*/
private static void UnLocked(File file, int password) throws FileNotFoundException, IOException {
Locked(file,password,1);
}
/**
* Locked
* @param file 需要加密文件
* @param password 密码
* @throws FileNotFoundException
* @throws IOException
*/
private static void Locked(File file, int password, int state)
throws FileNotFoundException, IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(
file));
BufferedOutputStream bos;
if (state == 0) {
// 加密副本
StringBuilder sb = new StringBuilder(file.getAbsolutePath());
StringBuilder sb2 = sb.replace(file.getAbsolutePath().length()-file.getName().length(),
file.getAbsolutePath().length(),"加密_"+file.getName());
bos = new BufferedOutputStream(new FileOutputStream(
sb2.toString()));
} else {
// 解锁副本
StringBuilder sb = new StringBuilder(file.getAbsolutePath());
StringBuilder sb2 = sb.replace(file.getAbsolutePath().length()-file.getName().length(),
file.getAbsolutePath().length(),"解锁_"+file.getName());
bos = new BufferedOutputStream(new FileOutputStream(sb2.toString()));
}
int b = -1;
int count =0;
while ((b = bis.read()) != -1) {
count ++;
bos.write(b ^ password);
if (count % 1000 == 0) {
bos.flush();
}
}
bis.close();
bos.close();
}
/**
* 输入密码
* @return password
* @throws IOException
*/
private static int Lock() throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入密码(学号):");
String pass = br.readLine();
char[] ch = pass.toCharArray();
int password = 0;
for (char c : ch) {
password += (int) c;
}
return password;
}
/**
* 获取加密文件
* @return 需要加密文件
* @throws IOException
*/
private static File getFile() throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
while (true) {
System.out.println("请输入加密文件路径:");
String path = br.readLine();
File file = new File(path);
if (file.isFile()) {
System.out.println("获取文件成功");
return file;
} else {
System.out.println("您输入的文件路径有误,请重新输入");
}
}
}
}

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