这种方式不修改历史,符合事件不可变原则,更适合生产环境。
修改后的 __init__ 方法如下:class AESCipher(object): def __init__(self, key=None): # Initialize the AESCipher object with a key, # defaulting to a randomly generated key self.block_size = AES.block_size if key: self.key = b64decode(key.encode()) else: self.key = Random.new().read(self.block_size)完整代码示例 以下是修改后的完整代码示例:import hashlib from Crypto.Cipher import AES from Crypto import Random from base64 import b64encode, b64decode class AESCipher(object): def __init__(self, key=None): # Initialize the AESCipher object with a key, # defaulting to a randomly generated key self.block_size = AES.block_size if key: self.key = b64decode(key.encode()) else: self.key = Random.new().read(self.block_size) def encrypt(self, plain_text): # Encrypt the provided plaintext using AES in CBC mode plain_text = self.__pad(plain_text) iv = Random.new().read(self.block_size) cipher = AES.new(self.key, AES.MODE_CBC, iv) encrypted_text = cipher.encrypt(plain_text) # Combine IV and encrypted text, then base64 encode for safe representation return b64encode(iv + encrypted_text).decode("utf-8") def decrypt(self, encrypted_text): # Decrypt the provided ciphertext using AES in CBC mode encrypted_text = b64decode(encrypted_text) iv = encrypted_text[:self.block_size] cipher = AES.new(self.key, AES.MODE_CBC, iv) plain_text = cipher.decrypt(encrypted_text[self.block_size:]) return self.__unpad(plain_text) def get_key(self): # Get the base64 encoded representation of the key return b64encode(self.key).decode("utf-8") def __pad(self, plain_text): # Add PKCS7 padding to the plaintext number_of_bytes_to_pad = self.block_size - len(plain_text) % self.block_size padding_bytes = bytes([number_of_bytes_to_pad] * number_of_bytes_to_pad) padded_plain_text = plain_text.encode() + padding_bytes return padded_plain_text @staticmethod def __unpad(plain_text): # Remove PKCS7 padding from the plaintext last_byte = plain_text[-1] return plain_text[:-last_byte] if isinstance(last_byte, int) else plain_text def save_to_notepad(text, key, filename): # Save encrypted text and key to a file with open(filename, 'w') as file: file.write(f"Key: {key}\nEncrypted text: {text}") print(f"Text and key saved to {filename}") def encrypt_and_save(): # Take user input, encrypt, and save to a file user_input = "" while not user_input: user_input = input("Enter the plaintext: ") aes_cipher = AESCipher() # Randomly generated key encrypted_text = aes_cipher.encrypt(user_input) key = aes_cipher.get_key() filename = input("Enter the filename (including .txt extension): ") save_to_notepad(encrypted_text, key, filename) def decrypt_from_file(): # Decrypt encrypted text from a file using a key filename = input("Enter the filename to decrypt (including .txt extension): ") with open(filename, 'r') as file: lines = file.readlines() key = lines[0].split(":")[1].strip() encrypted_text = lines[1].split(":")[1].strip() aes_cipher = AESCipher(key) decrypted_bytes = aes_cipher.decrypt(encrypted_text) # Decoding only if the decrypted bytes are not empty decrypted_text = decrypted_bytes.decode("utf-8") if decrypted_bytes else "" print("Decrypted Text:", decrypted_text) def encrypt_and_decrypt_in_command_line(): # Encrypt and then decrypt user input in the command line user_input = "" while not user_input: user_input = input("Enter the plaintext: ") aes_cipher = AESCipher() encrypted_text = aes_cipher.encrypt(user_input) key = aes_cipher.get_key() print("Key:", key) print("Encrypted Text:", encrypted_text) decrypted_bytes = aes_cipher.decrypt(encrypted_text) decrypted_text = decrypted_bytes.decode("utf-8") if decrypted_bytes else "" print("Decrypted Text:", decrypted_text) # Menu Interface while True: print("\nMenu:") print("1. Encrypt and save to file") print("2. Decrypt from file") print("3. Encrypt and decrypt in command line") print("4. Exit") choice = input("Enter your choice (1, 2, 3, or 4): ") if choice == '1': encrypt_and_save() elif choice == '2': decrypt_from_file() elif choice == '3': encrypt_and_decrypt_in_command_line() elif choice == '4': print("Exiting the program. Goodbye!") break else: print("Invalid choice. Please enter 1, 2, 3, or 4.")注意事项 密钥管理: 密钥的安全至关重要。
利用Goroutine实现并发压缩与传输: 将压缩逻辑放入一个独立的Goroutine中,使其在后台运行,并将压缩后的数据通过通道发送。
示例:实现 UserInterface 接口 class WebUser implements UserInterface { public function login($username, $password) { // 验证用户名密码 echo "用户 {$username} 登录成功"; return true; } <pre class='brush:php;toolbar:false;'>public function logout() { session_destroy(); echo "用户已退出"; }} 如果未实现全部方法,PHP会抛出致命错误。
获取视频文件大小在PHP开发中很常见,比如上传验证、资源管理等场景。
Go语言switch的灵活性 Go语言的switch语句相比C或C++具有更高的灵活性。
示例代码: 立即学习“go语言免费学习笔记(深入)”;package main import "fmt" func main() { // 声明一个存储整数的切片 intSlice := []int{1, 2, 3} fmt.Println("初始整数切片:", intSlice) // 添加单个元素 intSlice = append(intSlice, 4) fmt.Println("添加4后:", intSlice) // 添加多个元素 intSlice = append(intSlice, 5, 6) fmt.Println("添加5,6后:", intSlice) // 声明一个存储字符串的切片 stringSlice := []string{"apple", "banana"} fmt.Println("初始字符串切片:", stringSlice) // 添加字符串 stringSlice = append(stringSlice, "cherry") fmt.Println("添加cherry后:", stringSlice) // 尝试向整数切片添加字符串会导致编译错误 // intSlice = append(intSlice, "hello") // 编译错误: cannot use "hello" (type string) as type int in append }优点: 类型安全:编译时检查,避免运行时类型错误。
标书对比王 标书对比王是一款标书查重工具,支持多份投标文件两两相互比对,重复内容高亮标记,可快速定位重复内容原文所在位置,并可导出比对报告。
表格驱动示例: func TestHelloHandler_TableDriven(t *testing.T) { tests := []struct { name string query string expected string }{ {"with name", "?name=Bob", "Hello, Bob!"}, {"without name", "", "Hello, !"}, } for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { req := httptest.NewRequest("GET", "/hello"+tt.query, nil) w := httptest.NewRecorder() HelloHandler(w, req) if w.Body.String() != tt.expected { t.Errorf("got %q, want %q", w.Body.String(), tt.expected) } }) } } 基本上就这些。
推荐使用PDO连接PostgreSQL,1. 确认php.ini中启用extension=pdo_pgsql和extension=pgsql,通过php -m验证;2. 使用$dsn = "pgsql:host=host;port=port;dbname=db"格式创建PDO实例并设置异常模式;3. 用prepare()和execute()执行预处理语句防止SQL注入;4. 脚本结束自动关闭连接,也可手动设$pdo=null。
Laravel多态关联 (Polymorphic Relations): 适用于不同类型附件有各自独特的字段和业务逻辑,需要独立模型来封装行为的场景。
理解HMAC-SHA256 hmac(keyed-hash message authentication code)是一种使用密钥和哈希函数来验证消息完整性和真实性的机制。
在defer内部,我们还封装了一个匿名函数,用于捕获file.Close()可能返回的错误。
2. 调整 /proc/sys/vm/overcommit_memory 设置 overcommit_memory 是 Linux 内核的一个参数,用于控制内存分配的行为。
注意避免频繁插入删除中间元素,会影响性能。
缺少C/C++编译器: 在Windows上,可能缺少Visual C++ Build Tools;在Linux上,可能缺少build-essential等编译工具链。
微信 WeLM WeLM不是一个直接的对话机器人,而是一个补全用户输入信息的生成模型。
其基本用法与Laravel的Http门面类似,因为Laravel的Http门面正是基于Guzzle构建的。
要检查文件是否可写,我们可以使用os.W_OK模式:import os def check_file_writable_os_access(file_path): """ 使用 os.access 检查文件是否可写。
// 修改后的并发逻辑 var wg sync.WaitGroup results := make(chan Result, 3) for i := 0; i wg.Add(1) go func(workerID int) { defer wg.Done() data := fetchDataFromSource(workerID) results nil} } (i) } go func() { wg.Wait() close(results) }() // 读取所有结果 var allData []string for result := range results { if result.Err == nil { allData = append(allData, result.Data...) } } 错误处理与超时控制 生产环境中需考虑协程执行失败或阻塞的情况,建议结合context实现超时机制。
本文链接:http://www.jacoebina.com/177327_671616.html