fix: 内存溢出

src/main/java/com/lqkj/link/util/RSAUtils.java

@@ -1,6 +1,7 @@
 package com.lqkj.link.util;
 
 import javax.crypto.Cipher;
+import javax.crypto.NoSuchPaddingException;
 import java.nio.charset.StandardCharsets;
 import java.security.*;
 import java.security.spec.InvalidKeySpecException;
@@ -18,6 +19,18 @@ public class RSAUtils {
     //KeyPair is a simple holder for a key pair.
     private static final KeyPair keyPair = initKey();
 
+    private static Cipher cipher = null;
+
+    public static Cipher getInstance() throws NoSuchPaddingException, NoSuchAlgorithmException {
+        if (cipher == null) {
+                Provider provider = new org.bouncycastle.jce.provider.BouncyCastleProvider();
+                Security.addProvider(provider);
+                cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", provider);
+        }
+        return cipher;
+    }
+
+
     /**
      * 初始化方法，产生key pair，提供provider和random
      *
@@ -71,9 +84,7 @@ public class RSAUtils {
 
     private static byte[] encrypt(byte[] byteArray){
         try {
-            Provider provider = new org.bouncycastle.jce.provider.BouncyCastleProvider();
-            Security.addProvider(provider);
-            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", provider);
+            Cipher cipher = getInstance();
             PublicKey publicKey = keyPair.getPublic();
             cipher.init(Cipher.ENCRYPT_MODE, publicKey);
             return cipher.doFinal(byteArray);
@@ -84,11 +95,9 @@ public class RSAUtils {
 
     private static byte[] decrypt(byte[] byteArray) {
         try {
-            Provider provider = new org.bouncycastle.jce.provider.BouncyCastleProvider();
-            Security.addProvider(provider);
             //Cipher: 提供加密和解密功能的实例
             //transformation: "algorithm/mode/padding"
-            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", provider);
+            Cipher cipher = getInstance();
             PrivateKey privateKey = keyPair.getPrivate();
             //初始化
             cipher.init(Cipher.DECRYPT_MODE, privateKey);
@@ -101,9 +110,7 @@ public class RSAUtils {
 
     private static byte[] encrypt(byte[] byteArray, String publicKey){
         try {
-            Provider provider = new org.bouncycastle.jce.provider.BouncyCastleProvider();
-            Security.addProvider(provider);
-            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", provider);
+            Cipher cipher = getInstance();
             cipher.init(Cipher.ENCRYPT_MODE, getPublicKey(publicKey));
             return cipher.doFinal(byteArray);
         } catch (Exception e) {