MD5加密（带密钥）

package com.whc.noteserver.test;


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;


import org.apache.commons.codec.digest.DigestUtils;


public class MD5 {
     
    /**
     * @param text明文
     * @param key密钥
     * @return 密文
     */
    // 带秘钥加密
    public static String md5(String text, String key) throws Exception {
     
        // 加密后的字符串
        String md5str = DigestUtils.md5Hex(text + key);
        System.out.println("MD5加密后的字符串为:" + md5str);
        return md5str;
    }


    // 不带秘钥加密
    public static String md52(String text) throws Exception {
     
        // 加密后的字符串
        String md5str = DigestUtils.md5Hex(text);
        System.out.println("MD52加密后的字符串为:" + md5str + "\t长度：" + md5str.length());
        return md5str;
    }


    /**
     * MD5验证方法
     *
     * @param text明文
     * @param key密钥
     * @param md5密文
     */
    // 根据传入的密钥进行验证
    public static boolean verify(String text, String key, String md5) throws Exception {
     
        String md5str = md5(text, key);
        if (md5str.equalsIgnoreCase(md5)) {
     
            System.out.println("MD5验证通过");
            return true;
        }
        return false;
    }

    public static String readFileByBytes(String fileName){
     
        StringBuffer sBuffer = new StringBuffer();
    try {
     
        File file = new File(fileName);
        InputStream inputStream = null;
        if(file.isFile() && file.exists()) {
     
            System.out.println("进入if");
            byte[] tempbytes = new byte[1024];
            int byteread = 0;
            
                inputStream = new FileInputStream(file);
                System.out.println("进入while循环之前");
                while((byteread = inputStream.read(tempbytes)) != -1) {
     
                    System.out.println("进入循环");
                    String string = new String(tempbytes,0,byteread);
                    sBuffer.append(string);
                }
            
           }
        } catch (IOException e) {
     
            
        }finally {
     
            return sBuffer.toString();
        }
     
        
    }
    
    // 测试
        public static void main(String[] args) throws Exception{
     
            // String str =
            // "181115.041650.10.88.168.148.2665.2419425653_1";181115.040908.10.88.181.118.3013.1655327821_1
            /*
             * String str = "181115.040908.10.88.181.118.3013.1655327821_1";
             * System.out.println("加密的字符串：" + str + "\t长度：" + str.length()); MD5.md52(str);
             */
           
        }

}