Java 对字符串数据进行MD5/SHA1哈希散列运算

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));
}
}

1

MD5
: 900150983cd24fb0d6963f7d28e17f72

2

SHA1
: a9993e364706816aba3e25717850c26c9cd0d89d