Java中的安全配置管理和访问控制策略

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.KeyStore.PasswordProtection;
import java.security.cert.Certificate;

public class KeyManagerExample {

    public static void main(String[] args) throws Exception {
        // 创建一个KeyStore对象
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());

        // 加载密钥库文件
        FileInputStream fis = new FileInputStream("keystore.jks");
        char[] password = "password".toCharArray();
        keyStore.load(fis, password);

        // 获取密钥
        String alias = "mykey";
        char[] keyPassword = "keypassword".toCharArray();
        PasswordProtection protection = new KeyStore.PasswordProtection(keyPassword);
        KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(alias, protection);
        java.security.PrivateKey privateKey = privateKeyEntry.getPrivateKey();

        // 使用私钥进行相应的操作
        ...
    }
}

import java.io.FilePermission;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.Permission;

public class AccessControlExample {

    public static void main(String[] args) {
        // 创建一个读取文件的权限
        Permission permission = new FilePermission("/path/to/file.txt", "read");

        // 检查当前线程是否拥有该权限
        try {
            AccessController.checkPermission(permission);
            // 执行需要该权限的操作
            ...
        } catch (AccessControlException e) {
            // 没有权限，执行相应的处理逻辑
            ...
        }
    }
}