更新時(shí)間:2023-07-06 來(lái)源:黑馬程序員 瀏覽量:
在Java中進(jìn)行模糊查詢時(shí),如果數(shù)據(jù)已經(jīng)加密,我們需要先對(duì)模糊查詢的關(guān)鍵詞進(jìn)行加密,然后將加密后的關(guān)鍵詞與加密后的數(shù)據(jù)進(jìn)行比對(duì)。下面是一個(gè)示例代碼,演示了如何使用Java的加密庫(kù)和模糊查詢實(shí)現(xiàn)這一過(guò)程:
import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; import java.nio.charset.StandardCharsets; import java.util.ArrayList; import java.util.List; public class FuzzySearchExample { private static final String ENCRYPTION_ALGORITHM = "AES"; private static final String SECRET_KEY = "MySecretKey12345"; // 密鑰,注意要與加密時(shí)使用的密鑰一致 public static void main(String[] args) throws Exception { List<String> encryptedData = new ArrayList<>(); encryptedData.add(encryptData("apple")); // 假設(shè)數(shù)據(jù)已經(jīng)加密,存儲(chǔ)在列表中 encryptedData.add(encryptData("banana")); encryptedData.add(encryptData("orange")); String searchKeyword = encryptData("app"); // 假設(shè)模糊查詢的關(guān)鍵詞也已經(jīng)加密 List<String> matchedData = new ArrayList<>(); for (String encrypted : encryptedData) { if (isMatched(encrypted, searchKeyword)) { matchedData.add(decryptData(encrypted)); // 匹配成功,解密并添加到結(jié)果列表 } } System.out.println("匹配的數(shù)據(jù):"); for (String data : matchedData) { System.out.println(data); } } private static String encryptData(String data) throws Exception { SecretKeySpec secretKeySpec = new SecretKeySpec(SECRET_KEY.getBytes(StandardCharsets.UTF_8), ENCRYPTION_ALGORITHM); Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec); byte[] encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8)); return new String(encryptedBytes, StandardCharsets.UTF_8); } private static String decryptData(String encryptedData) throws Exception { SecretKeySpec secretKeySpec = new SecretKeySpec(SECRET_KEY.getBytes(StandardCharsets.UTF_8), ENCRYPTION_ALGORITHM); Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec); byte[] decryptedBytes = cipher.doFinal(encryptedData.getBytes(StandardCharsets.UTF_8)); return new String(decryptedBytes, StandardCharsets.UTF_8); } private static boolean isMatched(String encryptedData, String searchKeyword) throws Exception { String decryptedData = decryptData(encryptedData); return decryptedData.contains(searchKeyword); // 使用contains()方法進(jìn)行模糊匹配 } }
上述示例代碼中,我們使用AES算法對(duì)數(shù)據(jù)進(jìn)行加密和解密。首先,將數(shù)據(jù)加密并存儲(chǔ)在列表中。然后,將模糊查詢的關(guān)鍵詞進(jìn)行加密,并與列表中的加密數(shù)據(jù)進(jìn)行比對(duì)。如果匹配成功,就將加密數(shù)據(jù)解密,并添加到結(jié)果列表中。最后,輸出匹配的數(shù)據(jù)。
需要注意的是,上述示例僅用于演示目的,并未包含完整的錯(cuò)誤處理和最佳實(shí)踐。在實(shí)際應(yīng)用中,應(yīng)考慮加入合適的異常處理、密鑰管理和安全性措施,以確保數(shù)據(jù)的安全性和正確性。