- 使用java提供的類庫
@Test
public void givenPassword_whenHashing_thenVerifying()
throws NoSuchAlgorithmException {
String hash = "35454B055CC325EA1AF2126E27707052";
String password = "ILoveJava";
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(password.getBytes());
byte[] digest = md.digest();
String myHash = DatatypeConverter
.printHexBinary(digest).toUpperCase();
assertThat(myHash.equals(hash)).isTrue();
}
我們也可以校驗文件
@Test
public void givenFile_generatingChecksum_thenVerifying()
throws NoSuchAlgorithmException, IOException {
String filename = "src/test/resources/test_md5.txt";
String checksum = "5EB63BBBE01EEED093CB22BB8F5ACDC3";
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(Files.readAllBytes(Paths.get(filename)));
byte[] digest = md.digest();
String myChecksum = DatatypeConverter
.printHexBinary(digest).toUpperCase();
assertThat(myChecksum.equals(checksum)).isTrue();
}
- 使用Apache commons 的
org.apache.commons.codec.digest.DigestUtils
@Test
public void givenPassword_whenHashingUsingCommons_thenVerifying() {
String hash = "35454B055CC325EA1AF2126E27707052";
String password = "ILoveJava";
String md5Hex = DigestUtils.md5Hex(password).toUpperCase();
assertThat(md5Hex.equals(hash)).isTrue();
}
- 使用spring提供的和apache commons差不多的
org.springframework.util.DigestUtils
DigestUtils.md5DigestAsHex(str.getBytes())
- 使用guava的
com.google.common.io.Files.hash
@Test
public void givenFile_whenChecksumUsingGuava_thenVerifying()
throws IOException {
String filename = "src/test/resources/test_md5.txt";
String checksum = "5EB63BBBE01EEED093CB22BB8F5ACDC3";
HashCode hash = com.google.common.io.Files.hash(new File(filename), Hashing.md5());
String myChecksum = hash.toString().toUpperCase();
assertThat(myChecksum.equals(checksum)).isTrue();
}
