Java 對字符串數據進行MD5/SHA1哈希散列運算

Java對字符串數據進行MD5/SHA1哈希散列運算

package cn.aibo.test;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class TestMd5AndSha1 {

    public static String md5(String data) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(data.getBytes());
        StringBuffer buf = new StringBuffer();
        byte[] bits = md.digest();
        for(int i=0;i<bits.length;i++){
            int a = bits[i];
            if(a<0) a+=256;
            if(a<16) buf.append("0");
            buf.append(Integer.toHexString(a));
        }
        return buf.toString();
    }

    public static String sha1(String data) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA1");
        md.update(data.getBytes());
        StringBuffer buf = new StringBuffer();
        byte[] bits = md.digest();
        for(int i=0;i<bits.length;i++){
            int a = bits[i];
            if(a<0) a+=256;
            if(a<16) buf.append("0");
            buf.append(Integer.toHexString(a));
        }
        return buf.toString();
    }

    public static void main(String[] args) throws NoSuchAlgorithmException{
        String data = "abc";
        //MD5
        System.out.println("MD5 : "+md5(data));
        //SHA1
        System.out.println("SHA1 : "+sha1(data));
    }
}

運算結果

1	MD5 : 900150983cd24fb0d6963f7d28e17f72

2	SHA1 : a9993e364706816aba3e25717850c26c9cd0d89d

來源： http://blog.csdn.net/rongwenbin/article/details/42493949

來自為知筆記(Wiz)