3DES sun例子编译错误的修正方法 SunJCE() is not accessible

在搭建项目环境时出现了以下编译错误：

Access restriction: The constructor SunJCE() is not accessible due to restriction on required library J:\jdk\jre\lib\ext\sunjce_provider.jar
访问限制：由于J:\jdk\jre\lib\ext\sunjce_provider.jar库的限制，SunJCE() 构造函数不可访问。

在网上搜了一下，解决办法是修改编译选项，方法如下：Window -> Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and restricted API -> Forbidden reference (access rules) -> Warnings或者Ignore即可。

样例程序

package des;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class ThreeDes {

	/**
	 * 在java中调用sun公司提供的3DES加密解密算法时，需要使用到$JAVA_HOME/jre/lib/目录下如下的4个jar包： 　
	 * jce.jar security/US_export_policy.jar 　　 security/local_policy.jar
	 * ext/sunjce_provider.jar 　　
	 */
	private static final String Algorithm = "DESede"; // 定义加密算法,可用

	// DES,DESede,Blowfish

	// keybyte为加密密钥，长度为24字节
	// src为被加密的数据缓冲区（源）
	public static byte[] encryptMode(byte[] keybyte, byte[] src) {
		try {
			// 生成密钥
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
			// 加密
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);
			return c1.doFinal(src);// 在单一方面的加密或解密
		} catch (java.security.NoSuchAlgorithmException e1) {
			// TODO: handle exception
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	// keybyte为加密密钥，长度为24字节
	// src为加密后的缓冲区
	public static byte[] decryptMode(byte[] keybyte, byte[] src) {
		try {
			// 生成密钥
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
			// 解密
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			// TODO: handle exception
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	// 转换成十六进制字符串
	public static String byte2Hex(byte[] b) {
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1) {
				hs = hs + "0" + stmp;
			} else {
				hs = hs + stmp;
			}
			if (n < b.length - 1)
				hs = hs + ":";
		}
		return hs.toUpperCase();
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// 添加新安全算法,如果用JCE就要把它添加进去
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		final byte[] keyBytes = { 0x11, 0x22, 0x4F, 0x58, (byte) 0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (byte) 0xCB,
				(byte) 0xDD, 0x55, 0x66, 0x77, 0x29, 0x74, (byte) 0x98, 0x30, 0x40, 0x36, (byte) 0xE2 }; // 24字节的密钥
		String szSrc = "This is a 3DES test. 测试";
		System.out.println("加密前的字符串:" + szSrc);
		byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());
		System.out.println("加密后的字符串:" + new String(encoded));
		byte[] srcBytes = decryptMode(keyBytes, encoded);
		System.out.println("解密后的字符串:" + (new String(srcBytes)));
	}

}