base64加解密字符串

 

 

import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.io.IOException;  
import java.util.zip.ZipEntry;  
import java.util.zip.ZipInputStream;  
import java.util.zip.ZipOutputStream;  
  
import org.slf4j.Logger;  
import org.slf4j.LoggerFactory;  
  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
  
  
/** 
 *  
 * 对字符串进行加解密和加解压 
 * 
 */  
@SuppressWarnings("restriction")  
public class Base64Util {  
      
    private static Logger log = LoggerFactory.getLogger(Base64Util.class);  
      
    /** 
     * 将字符串压缩后Base64 
     * @param primStr 待加压加密函数 
     * @return 
     */  
    public static String encodeString(String primStr) {  
        if (primStr == null || primStr.length() == 0) {  
            return primStr;  
        }  
        ByteArrayOutputStream out = null;    
        ZipOutputStream zout = null;    
        try{    
            out = new ByteArrayOutputStream();    
            zout = new ZipOutputStream(out);    
            zout.putNextEntry(new ZipEntry("0"));  
            zout.write(primStr.getBytes("UTF-8"));    
            zout.closeEntry();  
            return new BASE64Encoder().encode(out.toByteArray());  
        } catch (IOException e) {  
            log.error("对字符串进行加压加密操作失败：", e);  
            return null;  
        } finally {  
            if (zout != null) {  
                try {  
                    zout.close();  
                } catch (IOException e) {  
                    log.error("对字符串进行加压加密操作，关闭zip操作流失败：", e);  
                }  
            }  
        }  
    }  
      
    /** 
     * 将压缩并Base64后的字符串进行解密解压 
     * @param compressedStr 待解密解压字符串 
     * @return 
     */  
    public static final String decodeString(String compressedStr) {  
        if (compressedStr == null) {  
            return null;  
        }  
        ByteArrayOutputStream out = null;  
        ByteArrayInputStream in = null;  
        ZipInputStream zin = null;  
        String decompressed = null;  
        try {  
            byte[] compressed = new BASE64Decoder().decodeBuffer(compressedStr);  
            out = new ByteArrayOutputStream();  
            in = new ByteArrayInputStream(compressed);  
            zin = new ZipInputStream(in);  
            zin.getNextEntry();  
            byte[] buffer = new byte[1024];  
            int offset = -1;  
            while((offset = zin.read(buffer)) != -1) {  
                out.write(buffer, 0, offset);  
            }  
            decompressed = out.toString("UTF-8");  
        } catch (IOException e) {  
            log.error("对字符串进行解密解压操作失败：", e);  
            decompressed = null;  
        } finally {  
            if (zin != null) {  
                try {  
                    zin.close();  
                } catch (IOException e) {  
                    log.error("对字符串进行解密解压操作，关闭压缩流失败：", e);  
                }  
            }  
            if (in != null) {  
                try {  
                    in.close();  
                } catch (IOException e) {  
                    log.error("对字符串进行解密解压操作，关闭输入流失败：", e);  
                }  
            }  
            if (out != null) {  
                try {  
                    out.close();  
                } catch (IOException e) {  
                    log.error("对字符串进行解密解压操作，关闭输出流失败：", e);  
                }  
            }  
        }  
        return decompressed;  
    }  
}