ZipBase64加密和解密

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
 * 对字符串进行压缩及加解密
 * @author Administrator
 *
 */
public class ZipBase64 {
	private BASE64Encoder Encoder=new BASE64Encoder();
	private BASE64Decoder Decoder=new BASE64Decoder();
	private int buffersize = 8092;
	/**
	 * 先压缩后加密
	 * @param str
	 * @return
	 */
	public String encode(String str){
        ByteArrayOutputStream byteos = new ByteArrayOutputStream();
        try {
        	ByteArrayInputStream byteis = new ByteArrayInputStream(str.getBytes("UTF-8"));//输入流
            ZipOutputStream zos = new ZipOutputStream(byteos);
            zos.setMethod(ZipOutputStream.DEFLATED);
        	zos.putNextEntry(new ZipEntry("lbs"));
            int b=-1;
            byte buffer[] = new byte[buffersize];
            while((b=byteis.read(buffer))!=-1)
            {
                    zos.write(buffer,0,b);
            }
            zos.closeEntry();

        } catch (Exception e) {
			return null;
		}
        
        //从输出流获取String
        return Encoder.encodeBuffer(byteos.toByteArray());
		
	}
	/**
	 * 先解密后解压
	 * @param str
	 * @return
	 * @throws IOException 
	 * @throws UnsupportedEncodingException 
	 */	
	public String decode(String str) throws IOException  {
        ByteArrayOutputStream jbyteos = new ByteArrayOutputStream();
        try {
            byte buffer1[] = new byte[buffersize];
            ByteArrayInputStream jbyteis = new ByteArrayInputStream(Decoder.decodeBuffer(str));
            ZipInputStream zis = new ZipInputStream(jbyteis);
        	zis.getNextEntry();
            int b=-1;
            while((b=zis.read(buffer1,0,buffersize))!=-1)
            {
                   jbyteos.write(buffer1,0,b);
            }

        } catch (Exception e) {
			return null;
		}    
        return new String(jbyteos.toByteArray(),"UTF-8");
	}
	/**
	 * 单元测试
	 * @param args
	 */
	public static void main(String[] args){
		String y="测试：123467890-=asdfghjkl;'zxcvbnm,./!@#$%^&*()_+:<>?";
		ZipBase64 z6=new ZipBase64();
		String j=z6.encode(y);
		System.out.println("原数据:"+y);
		System.out.println("处理后:"+j);
		System.out.println("反处理:"+y);
	}
	
}