使用装饰设计模式加密数据：

package com.zs.JiaJiE09; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; /** * 使用装饰设计模式把数据取反进行加密解密 * Key方法为钥匙 * * @author LZG * */ public class JMOutputStream extends OutputStream{ /** * 更多资料欢迎浏览凯哥学堂官网：http://kaige123.com  * @author 小沫 */ private int key; private OutputStream output; public JMOutputStream(OutputStream output){ this.output=output;			} public void Key(int key){ this.key=key;	} public void write(int b) throws IOException {		output.write(~b+key);	} public void write(byte[] b, int off, int len) throws IOException { for (int i = off; i < len; i++) {			output.write(~b[i]+key);		}	} public void write(byte[] b) throws IOException { for (int i = 0; i < b.length; i++) {			output.write(~b[i]+key);		}	}	}

测试类：

package com.zs.JiaJiE09; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class Test { /** * 更多资料欢迎浏览凯哥学堂官网：http://kaige123.com  * @author 小沫 */ public static void main(String[] args) throws IOException{						FileInputStream fin= new FileInputStream("e:/test/aa.txt");				JMOutputStream fout = new JMOutputStream(new FileOutputStream("d:/test/aa111.txt"));		fout.Key(1402); byte[] b = new byte[1024]; while(fin.available()!=0){ int len = fin.read(b);			fout.write(b, 0, len);		}				fin.close();		fout.close();	}}

使用装饰设计模式加密数据