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java 常用工具类,作为 apache-commons的补充
There is a newer version: 5.3.2302
package com.centit.support.file;

import com.centit.support.security.AESSecurityUtils;

import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import java.io.*;
import java.security.GeneralSecurityException;
@SuppressWarnings("unused")
public abstract class FileEncryptWithAes {
    private FileEncryptWithAes() {
        throw new IllegalAccessError("Utility class");
    }
    /**
     * 文件file进行加密并保存目标文件destFile中
     *
     * @param sourceFileName
     *            要加密的文件 如c:/test/srcFile.txt
     * @param diminationFileName
     *            加密后存放的文件名 如c:/加密后文件.txt
     * @param keyValue 密码
     * @throws IOException 异常
     * @throws GeneralSecurityException 异常
     * */
    public static void encrypt(String sourceFileName, String diminationFileName,String keyValue)
            throws IOException, GeneralSecurityException {
        encrypt(new File(sourceFileName), new File( diminationFileName), keyValue);
    }

    /**
     * 文件file进行加密并保存目标文件destFile中
     *
     * @param sourceFile
     *            要加密的文件 如c:/test/srcFile.txt
     * @param diminationFile
     *            加密后存放的文件名 如c:/加密后文件.txt
     * @param keyValue 密码
     * @throws GeneralSecurityException 异常
     * @throws IOException 异常
     */
    public static void encrypt(InputStream sourceFile, OutputStream diminationFile,String keyValue)
            throws IOException, GeneralSecurityException
    {
        try(CipherInputStream cis = new CipherInputStream(sourceFile, AESSecurityUtils.createEncryptCipher(keyValue)))
        {
            byte[] buffer = new byte[1024];
            int r;
            while ((r = cis.read(buffer)) > 0) {
                diminationFile.write(buffer, 0, r);
            }
            //cis.close();
            //is.close();
            //out.close();
        }
    }

    public static void encrypt(File sourceFile, File diminationFile,String keyValue)
            throws IOException, GeneralSecurityException
    {
        try( InputStream is = new FileInputStream(sourceFile);
                OutputStream out = new FileOutputStream(diminationFile))
        {
            encrypt(is,out,keyValue);
        }
    }

    /**
     * 文件采用AS算法解密文件
     *
     * @param sourceFileName
     *            已加密的文件 如c:/加密后文件.txt * @param destFile 解密后存放的文件名 如c:/
     *            test/解密后文件.txt
     * @param diminationFileName
     *            加密后存放的文件名 如c:/加密后文件.txt
     * @param keyValue 密码
     * @throws GeneralSecurityException 异常
     * @throws IOException 异常
     */
    public static void decrypt(String sourceFileName, String diminationFileName,String keyValue)
            throws IOException, GeneralSecurityException  {
        decrypt(new File(sourceFileName), new File( diminationFileName), keyValue);
    }

    /**
     * 文件采用AS算法解密文件
     *
     * @param sourceFile
     *            已加密的文件 如c:/加密后文件.txt * @param destFile 解密后存放的文件名 如c:/
     *            test/解密后文件.txt
     * @param diminationFile
     *            加密后存放的文件名 如c:/加密后文件.txt
     * @param keyValue 密码
     * @throws GeneralSecurityException 异常
     * @throws IOException 异常
     */
    public static void decrypt(InputStream sourceFile, OutputStream diminationFile,String keyValue)
            throws IOException, GeneralSecurityException {
        try(
                CipherOutputStream cos = new CipherOutputStream(diminationFile, AESSecurityUtils.createDencryptCipher(keyValue)))
        {
            byte[] buffer = new byte[1024];
            int r;
            while ((r = sourceFile.read(buffer)) >= 0) {
                cos.write(buffer, 0, r);
            }
            //cos.close();
            //out.close();
            //is.close();
        }
    }
    /**
     * 文件采用AES算法解密文件
     * @param sourceFile
     *            已加密的文件 如c:/加密后文件.txt * @param destFile 解密后存放的文件名 如c:/
     *            test/解密后文件.txt
     * @param diminationFile
     *            加密后存放的文件名 如c:/加密后文件.txt
     * @param keyValue 密码
     * @throws GeneralSecurityException 异常
     * @throws IOException 异常
     */
    public static void decrypt(File sourceFile, File diminationFile,String keyValue)
            throws IOException, GeneralSecurityException {
        try(InputStream is = new FileInputStream(sourceFile);
                OutputStream out = new FileOutputStream(diminationFile))
        {
            decrypt(is,out,keyValue);
        }
    }
}