for example commons-codec maven:
<dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.11</version> </dependency>how to md5 encrypt string? as follows.
import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import org.apache.commons.codec.digest.DigestUtils; public class ArrayDemo { public static void main(String[] args) throws NoSuchAlgorithmException { String str = "hello world"; //java MD5 native encryption method MessageDigest md = MessageDigest.getInstance("MD5"); byte[] arr = md.digest(str.getBytes()); String md5Str = md5ToString(arr); System.out.println(md5Str); //the third party encryption method byte[] md5 = DigestUtils.md5(str); String md5Str2 = md5ToString(md5); System.out.println(md5Str2); //the third party encryption method that returns the MD5 hex string String md5Str3 = DigestUtils.md5Hex(str.getBytes()); System.out.println(md5Str3); } //将md5数组转化为16进制字符串 public static String md5ToString(byte[] md5){ StringBuilder sb = new StringBuilder(); for (int i = 0; i < md5.length; i++) { int temp = md5[i] & 0Xff; String hexString = Integer.toHexString(temp); if (hexString.length() < 2) { sb.append("0").append(hexString); } else { sb.append(hexString); } } return sb.toString(); } }note: the md5 native encryption method in java.security jar package, the third party encryption method in org.apache.commons.codec.digest jar package.
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