java php DES 加密解密
import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DES {
private byte[] desKey;
public DES(String desKey) {
this.desKey = desKey.getBytes();
}
public byte[] desEncrypt(byte[] plainText) throws Exception {
SecureRandom sr = new SecureRandom();
byte rawKeyData[] = desKey;
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key, sr);
byte data[] = plainText;
byte encryptedData[] = cipher.doFinal(data);
return encryptedData;
}
public byte[] desDecrypt(byte[] encryptText) throws Exception {
SecureRandom sr = new SecureRandom();
byte rawKeyData[] = desKey;
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key, sr);
byte encryptedData[] = encryptText;
byte decryptedData[] = cipher.doFinal(encryptedData);
return decryptedData;
}
public String encrypt(String input) throws Exception {
return base64Encode(desEncrypt(input.getBytes()));
}
public String decrypt(String input) throws Exception {
byte[] result = base64Decode(input);
return new String(desDecrypt(result));
}
public static String base64Encode(byte[] s) {
if (s == null)
return null;
BASE64Encoder b = new sun.misc.BASE64Encoder();
return b.encode(s);
}
public static byte[] base64Decode(String s) throws IOException {
if (s == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
byte[] b = decoder.de
相关文档：
通过java的反射机制，动态调用某个方法：
如下：
public Object invokeMethod(String className, String methodName,
Object[] args) throws Exception{
Class ownerClass = Class.forName(className);
Object owner = ownerClass.newInstance();
Class[] argsClass = new Class[args.length ......
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
* 将内容追加到文件尾部
*/
public class AppendToFile
{
/**
* A方法追加文件：使用RandomAccessFile
*
......
long startTime=System.currentTimeMillis(); //获取开始时间
doSomeThing(); //测试的代码段
long endTime=System.currentTimeMillis(); //获取结束时间
System.out.println("程序运行时间： "+(end-start)+"ms"); ......
编者按：Java内存泄漏是每个Java程序员都会遇到的问题，程序在本地运行一切正常，可是布署到远端就会出现内存无限制的增长，最后系统瘫痪，那么如
何最快最好的检测程序的稳定性，防止系统崩盘，作者用自已的亲身经历与各位网友分享解决这些问题的办法。
作为Internet最流行的� ......
Java中调用C/C++生成的DLL
一、 生成C的头文件
1. 编辑Main.java
public class Main
{
public native static int getStrNum(byte str[], int strLen);
}
2. 生成头文件
按win + r打开“运行”窗口，输入“cmd”，打开 ......
