unencrypt.java~10~

java中加密解密的用法全例子！这个对于爱好java的朋友对加密解密的学习很有用

package encryptandunencrypt;

import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

public class UnEncrypt {
    private String fenge = java.io.File.separator;
    public void UnEncrypt() throws Exception {
        //僼傽僀儖傪僥僗僩偟偰懚嵼偡傞偐偳偆偐丅
        TestFile testFile = new TestFile();
        boolean flag = testFile.Testbnavie_exp_enc();
        if (!flag) {
            return;
        }

        //XML僼傽僀儖偺僷僗傪妉摼偡傞丅
        XMLPath xPt = new XMLPath();
        String xmlPath = null;
        try {
            xmlPath = xPt.getXmlPath();
        } catch (Exception ex) {
            ex.printStackTrace();
            System.exit(0);
        }

        //岞奐尞傪宍惉偡傞
        byte[] keykb = {
                       28, -1, 64, 64, 71, 106, 1, 72, -31, 47, -108, -75, -110,
                       78, 33, 105};
        SecretKeySpec secretKeySpec = new SecretKeySpec(keykb, "BlowFish");

        //the file name of unencrypt丅
        String encrypt = "bo:\\encrypt" + fenge + "bnavie_exp.xml";
        //the file encrypted丅
        String encrypted = "bo:\\encrypt" + fenge + "bnavie_exp_enc.xml";

        try {
            //埫崋壔偺曽幃傪憂寶偟偰弶婜壔偡傞丅
            Cipher cipher = null;
            cipher = Cipher.getInstance("BlowFish");
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);

            //憂寶偺埫崋壔偡傞偺偼晧偗偰帪悽偵崌偆丅
            FileInputStream fileInputStream = null;
            fileInputStream = new FileInputStream(encrypted);

            //CipherInputStream懳徾傪憂寶偡傞丅
            CipherInputStream cipherInputStream = new CipherInputStream(
                    fileInputStream, cipher);

            //強偼枾側寢壥傪棟夝偡傞丅
            FileOutputStream fileOutputStream = null;
            fileOutputStream = new FileOutputStream(encrypt);

            //晧偗傞偙偲傪摼偰帪悽偵崌偆丅
            int b = 0;
            while ((b = cipherInputStream.read()) != -1) {
                fileOutputStream.write(b);
            }

            //偡傋偰偺桝弌擖傪暵嵔偟偰棳傟傞丅
            fileInputStream.close();
            cipherInputStream.close();
            fileOutputStream.close();

            //嶍彍偟偰埫崋壔偟偨屻偺僥儞億儔儕僼傽僀儖丅
            xmlPath = "bo\\unencrypt";
            String xmlField = xmlPath + fenge + "bnavie_exp_enc.xml";
            File xmlFile = new File(xmlField);
            xmlFile.delete();
        } catch (Exception ex) {
            ex.printStackTrace();
            throw ex;
        }
    }
}