public static String encode(byte[] binaryData) { if (binaryData == null) { return null; } int lengthDataBits = binaryData.length * EIGHTBIT; if (lengthDataBits == 0) { return ""; } int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP; int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP; int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets; char[] encodedData = null; encodedData = new char[numberQuartet * 4]; byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0; int encodedIndex = 0; int dataIndex = 0; for (int i = 0; i < numberTriplets; i++) { b1 = binaryData[dataIndex++]; b2 = binaryData[dataIndex++]; b3 = binaryData[dataIndex++]; l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3]; encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f]; } // form integral number of 6-bit groups if (fewerThan24bits == EIGHTBIT) { b1 = binaryData[dataIndex]; k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4]; encodedData[encodedIndex++] = PAD; encodedData[encodedIndex++] = PAD; } else if (fewerThan24bits == SIXTEENBIT) { b1 = binaryData[dataIndex]; b2 = binaryData[dataIndex + 1]; l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2]; encodedData[encodedIndex++] = PAD; } return new String(encodedData); }重构该方法，将其认知复杂度从18降低到允许的15。

String 与byte[] 间的转换

public static String hmacsha256(String plainStr, String key) { SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(Charset.forName("UTF-8")), "HmacSHA256"); Mac mac=null; try { mac = Mac.getInstance(secretKey.getAlgorithm()); mac.init(secretKey); } catch (NoSuchAlgorithmException | InvalidKeyException e) { e.printStackTrace(); } byte digest[] = mac.doFinal(plainStr.getBytes(Charset.forName("UTF- 8"))); return new StringBuilder().append(byte2HexStr(digest)).toString(); } public static String byte2HexStr(byte array[]) { return array != null ? new String(Hex.encodeHex(array)) : null; } java to PHP

The bin2hex function is then used to convert the binary data to a hexadecimal string, which is the same format as the output of the byte2HexStr function in the Java code. Also note that in PHP, ...

package server import ( "bytes" "encoding/binary" "errors" "time" "github.com/panjf2000/gnet" "github.com/zmicro-team/zmicro/core/log" "github.com/zchat-team/zim/app/conn/protocol" ) type TcpServer struct { gnet.EventHandler addr string codec gnet.ICodec srv Server } func NewTcpServer(srv Server, addr string) TcpServer { ts := new(TcpServer) ts.addr = addr ts.codec = &TcpCodec{} ts.srv = srv return ts } func (s TcpServer) Start() error { return gnet.Serve(s, s.addr, gnet.WithMulticore(true), gnet.WithTCPKeepAlive(time.Minute5), gnet.WithCodec(s.codec)) } func (s TcpServer) Stop() error { //return gnet.Stop(context.Background(), s.addr) return nil } func (s TcpServer) OnInitComplete(srv gnet.Server) (action gnet.Action) { log.Infof("tcp server is listening on %s (multi-cores: %t, loops: %d)", srv.Addr.String(), srv.Multicore, srv.NumEventLoop) return } func (s TcpServer) OnOpened(c gnet.Conn) (out []byte, action gnet.Action) { log.Info("TCP OnOpened ...") conn := &Connection{ Status: AuthPending, Conn: c, } c.SetContext(conn) s.srv.OnOpen(conn) return } func (s TcpServer) OnClosed(c gnet.Conn, err error) (action gnet.Action) { log.Info("TCP OnClose ...") conn, ok := c.Context().(Connection) if !ok { return } s.srv.OnClose(conn) return } func (s TcpServer) React(data []byte, c gnet.Conn) (out []byte, action gnet.Action) { conn, ok := c.Context().(Connection) if !ok { return } s.srv.OnMessage(data, conn) return } // ==================================== Codec ============================================== type TcpCodec struct { } func (_ TcpCodec) Encode(c gnet.Conn, buf []byte) ([]byte, error) { return buf, nil } func (_ TcpCodec) Decode(c gnet.Conn) ([]byte, error) { if size, header := c.ReadN(protocol.HeaderLen); size == protocol.HeaderLen { byteBuffer := bytes.NewBuffer(header) var p protocol.Packet if err := binary.Read(byteBuffer, binary.BigEndian, &p.HeaderLen); err != nil { return nil, err } if err := binary.Read(byteBuffer, binary.BigEndian, &p.Version); err != nil { return nil, err } if err := binary.Read(byteBuffer, binary.BigEndian, &p.Cmd); err != nil { return nil, err } if err := binary.Read(byteBuffer, binary.BigEndian, &p.Seq); err != nil { return nil, err } if err := binary.Read(byteBuffer, binary.BigEndian, &p.BodyLen); err != nil { return nil, err } protocolLen := int(protocol.HeaderLen + p.BodyLen) if size, data := c.ReadN(protocolLen); size == protocolLen { c.ShiftN(protocolLen) return data, nil } return nil, errors.New("not enough payload data") } return nil, errors.New("not enough header data") }

这段代码是一个使用 gnet 框架实现的 TCP 服务器，代码中定义了一个 TcpServer 结构体，并实现了 gnet.EventHandler 接口的相关方法。在 TcpServer 中定义了一个 gnet.ICodec 接口的实现 TcpCodec，用于对消息进行编...

在利用python读取二进制文件时,常用到re模块中的search函数,请详细说明它的用法,举充分的例子,请以下面的代码为基础,进行修改 text_data = "Hello, World!" number = 12345 with open('binary_file.bin', 'wb') as file: file.write(text_data.encode()) position = file.tell() byte_data = number.to_bytes(4, 'big') file.write(byte_data) with open('binary_file.bin', 'rb') as file: text = file.read(10) print(text.decode()) file.seek(20) data = file.read() print(int.from_bytes(data, 'big'))

file.write(text_data.encode()) position = file.tell() byte_data = number.to_bytes(4, 'big') file.write(byte_data) with open('binary_file.bin', 'rb') as file: data = file.read() match = re....

在利用python读取二进制文件时,常用到re模块中的match函数,请详细说明它的用法,举充分的例子,请以下面的代码为基础,进行修改 text_data = "Hello, World!" number = 12345 with open('binary_file.bin', 'wb') as file: file.write(text_data.encode()) position = file.tell() byte_data = number.to_bytes(4, 'big') file.write(byte_data) with open('binary_file.bin', 'rb') as file: text = file.read(10) print(text.decode()) file.seek(20) data = file.read() print(int.from_bytes(data, 'big'))

with open('binary_file.bin', 'rb') as file: data = file.read() match = re.match(pattern, data) if match: print("匹配成功！") else: print("匹配失败！") 在上面的代码中，我们使用rb前缀定义了一...

function readExcel(file_obj){ var reader = new FileReader(); var file = file_obj.files[0]; reader.readAsBinaryString(file); reader.onload = function (e) { var data = e.target.result; var wb = XLSX.read(data, {type: 'binary'}); sheetName = wb.SheetNames[0] // 获取文档中第一个sheet页签的名字 sheets = wb.Sheets[sheetName] // 获sheet名页签下的数据 const length=XLSX.utils.sheet_to_json(sheets).length const rowIndex = 5; // 指定需要获取的行号 const columnIndex = 3; // 指定需要获取的列号 let columnDate=[];//列 let rowDate=[];// let date=[]; for(let index=columnIndex+1;index<=20;index++){ const cellAddress = XLSX.utils.encode_cell({ r: rowIndex - 1, c: index - 1 }); const cellValue = sheets[cellAddress] ? sheets[cellAddress].v : null; if(cellValue===null){ break }else{ columnDate.push({name:cellValue,index:index}) } } for(let index=rowIndex+1;index<=length;index++){ const cellAddress = XLSX.utils.encode_cell({ r: index - 1, c: columnIndex - 1 }); const cellValue = sheets[cellAddress] ? sheets[cellAddress].v : null; if(cellValue===null){ continue }else{ for(let i=0;i<=columnDate.length;i++){ let column=columnDate[i].index-1 console.log(columnDate[i].index) const cellAddress = XLSX.utils.encode_cell({ r: index - 1, c: column }); console.log(cellAddress) const cellValue = sheets[cellAddress] ? sheets[cellAddress].v : null; console.log(cellValue) date.push(cellValue) } rowDate.push({name:cellValue,index:index}) } } console.log(rowDate); const cellAddress = XLSX.utils.encode_cell({ r: rowIndex - 1, c: columnIndex - 1 }); const cellValue = wb.Sheets[sheetName][cellAddress].v; JSON.stringify(XLSX.utils.sheet_to_json(sheets)); //console.log(XLSX.utils.sheet_to_json(sheets)); // 返回sheet对象到控制台 }; }我这里哪里错了，怎么修改

var wb = XLSX.read(data, { type: 'binary' }); sheetName = wb.SheetNames[0]; sheets = wb.Sheets[sheetName]; const length = XLSX.utils.sheet_to_json(sheets).length; const rowIndex = 5; const ...

1 package com.alibaba.traffic.web; 2 3 import java.io.UnsupportedEncodingException; 4 import java.security.InvalidKeyException; 5 import java.security.NoSuchAlgorithmException; 6 7 import javax.crypto.Mac; 8 import javax.crypto.SecretKey; 9 import javax.crypto.spec.SecretKeySpec; 10 11 import org.apache.commons.codec.binary.Hex; 12 特别注意附件 6 13 /** 14 * @author dongdong.fdd 15 * @date 2018/9/27 上午11:29 16 */ 17 public class T { 18 public static void main(String[] args) 19 throws InvalidKeyException, UnsupportedEncodingException, No SuchAlgorithmException { 20 long timestamp = System.currentTimeMillis() / 1000; 21 String paramValuesStr = "allAMAP-TRAFFIC-BRAIN10" + timestam p;//该值为排好序的参数的参数值拼接结果 22 String clientSecret = "testclientsecret";//该值为申请到的client Secret 23 24 Mac mac = Mac.getInstance("HmacSHA256"); 25 byte[] secretByte = clientSecret.getBytes("UTF-8"); 26 byte[] dataBytes = paramValuesStr.getBytes("UTF-8"); 27 28 SecretKey secretKey = new SecretKeySpec(secretByte,"HMACSHA2 56"); 29 mac.init(secretKey); 30 31 byte[] doFinal = mac.doFinal(dataBytes); 32 byte[] hexB = new Hex().encode(doFinal); 33 34 String digest = new String(hexB, "utf-8");//计算好的签名 26f2042cde2e9ca01d41ecdb27a91fd9b84f0263c411bcb13b195ec589096885 35 System.out.println(digest); 36 37 String resultUrl = "http://et-api.amap.com/index/cityRankin g?adcodes=all&clientKey=AMAP-TRAFFIC-BRAIN&size=10×tamp="+times tamp+"&digest=" + digest; 38 System.out.println(resultUrl); 39 } 将这段代码使用python实现

digest = hmac.new(secret_byte, data_bytes, hashlib.sha256).hexdigest() timestamp = int(time.time()) result_url = f...

import re import struct text_data = "Hello, World!" number = 12345 with open('binary_file.bin', 'wb') as file: file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) #byte_data = number.to_bytes(4, 'big') #file.write(byte_data) with open('binary_file.bin', 'rb') as file: pattern = "Hel{.1}lo{.5}" data = file.read() match = re.match(pattern, data) 这段代码错在哪里

file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) with open('binary_file.bin', 'rb') as file: pattern = r"Hel{1}lo{5}" ...

import re text_data = "Hello, World!" pattern = r"Hello" with open('binary_file.bin', 'wb') as file: file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) with open('binary_file.bin', 'rb') as file: data = file.read() start_pos = 0 while True: match = re.search(pattern,data.decode(), start_pos) if match: print(f"Found at position {match.start()} - {match.end()}") start_pos = match.end() else: break 这段代码的运行结果如下,是为什么 Found at position 0 - 5 Traceback (most recent call last): File "C:\Users\LX\Desktop\00.py", line 16, in <module> match = re.search(pattern,data.decode(), start_pos) File "C:\Users\LX\AppData\Local\Programs\Python\Python310\lib\re.py", line 200, in search return _compile(pattern, flags).search(string) File "C:\Users\LX\AppData\Local\Programs\Python\Python310\lib\re.py", line 303, in _compile p = sre_compile.compile(pattern, flags) File "C:\Users\LX\AppData\Local\Programs\Python\Python310\lib\sre_compile.py", line 764, in compile p = sre_parse.parse(p, flags) File "C:\Users\LX\AppData\Local\Programs\Python\Python310\lib\sre_parse.py", line 958, in parse p.state.flags = fix_flags(str, p.state.flags) File "C:\Users\LX\AppData\Local\Programs\Python\Python310\lib\sre_parse.py", line 925, in fix_flags raise ValueError("cannot use LOCALE flag with a str pattern") ValueError: cannot use LOCALE flag with a str pattern

file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) file.write(text_data.encode()) with open('binary_file.bin', 'rb') as file: data = file.read() start_...

def localUpdate(self, localEpoch, localBatchSize, Net, lossFun, opti, global_parameters, share=None): Net.load_state_dict(global_parameters, strict=True) self.train_dl = DataLoader(self.train_ds, batch_size=localBatchSize, shuffle=True) for epoch in range(localEpoch): for data, label in self.train_dl: data, label = data.to(self.dev), label.to(self.dev) preds = Net(data) loss = lossFun(preds, label) loss.backward() opti.step() opti.zero_grad() state_dict = self.encode_and_convert_to_binary(Net, share) return state_dict

这段代码是一个联邦学习中的本地更新函数。主要功能是在本地训练数据上训练模型，得到本地模型的参数，并将其编码并转换为二进制格式后返回。 ...其中，全局模型参数 global_parameters 是从中央服务器传递给本地...

from pyftpdlib.authorizers import DummyAuthorizer from pyftpdlib.handlers import FTPHandler,ThrottledDTPHandler from pyftpdlib.servers import FTPServer from pyftpdlib.log import LogFormatter import logging import configparser import pyftpdlib logger = logging.getLogger() logger.setLevel(logging.INFO) ch = logging.StreamHandler() fh = logging.FileHandler(filename='myftpserver.log',encoding='GBK') ch.setFormatter(LogFormatter()) fh.setFormatter(LogFormatter()) logger.addHandler(ch) logger.addHandler(fh) authorizer = DummyAuthorizer() authorizer.add_user("user", "12345", "d:/", perm="elradfmw") ENABLE_ANONYMOUS = 'on' if ENABLE_ANONYMOUS == 'on': authorizer.add_anonymous("d:/") handler = FTPHandler handler.authorizer = authorizer handler.passive_ports = range(8300, 8500) dtp_handler = ThrottledDTPHandler upload = 100 * 1024 #100kb/s download = 100 * 1024 #100kb/s dtp_handler = ThrottledDTPHandler dtp_handler.read_limit = download dtp_handler.write_limit = upload ip = '0.0.0.0' port = '21' server = FTPServer((ip, port), handler) Max_con = 100 server.max_per_ip = 10 server.max_cons = Max_con server.max_cons_per_ip =server.max_per_ip server.serve_forever() #创建文件 import ftplib from io import StringIO import io from ftplib import FTP ftp = FTP(host='localhost',user='user',passwd='12345') ftp.cwd('test') ftp.storlines('STOR poem.txt',io.StringIO('') ) ftp.quit() #写入数据 from io import StringIO import io from ftplib import FTP ftp = FTP(host='localhost',user='user',passwd='12345') ftp.cwd('test') binary_data = b'Hello, world!' text = binary_data.decode('utf-8') data_as_bytes = text.encode('utf-8') ftp.storlines('STOR test.txt',io.BytesIO(data_as_bytes)) #上传下载文件 from ftplib import FTP ftp = FTP(host='localhost',user='user',passwd='12345') ftp.encoding = 'gbk' ftp.cwd('test') ftp.retrlines('LIST') ftp.retrbinary('RETR poem.txt', open('poem.txt', 'wb').write) ftp.storbinary('STOR ftpserver.py', open('ftpserver.py', 'rb')) for f in ftp.mlsd(path='/test'): print(f)这段代码的数据处理分析

data_as_bytes = text.encode('utf-8') ftp.storlines('STOR test.txt',io.BytesIO(data_as_bytes)) 调用storlines方法将数据写入test.txt文件中。 7. 上传下载文件 from ftplib import FTP ftp = ...

function [out] = ldpc_encode(in,G,q) % function [out] = ldpc_encode(in,H,q) % encodes data from "in" using G over GFq % q = 2,4,8,16,32,64,128 or 256 % Please, make sure that the data you use is valid! % Requires matlab communication toolbox for GFq operations. % Basically, this function performs 'inG' over GFq. % this function is slow, will write a C version some time % Copyright (c) 1999 by Igor Kozintsev igor@ifp.uiuc.edu % $Revision: 1.0 $ $Date: 1999/11/23 $ [k,n] = size(G); if q==2 % binary case %%%%out = mod((in')G,2); out = mod((in)G,2); else M=log2(q); % GFq exponent [tuple power] = gftuple([-1:2^M-2]', M, 2); alpha = tuple 2.^[0 : M - 1]'; beta(alpha + 1) = 0 : 2^M - 1; ll = ones(1,n)*(-Inf); % will store results here, initialize with all zeros (exp form) ll = ll'; for i=1:k % multiply each row of G by the input symbol in GFq ii = power(beta(in(i)+1)+1); % get expon. representation of in(i) ii = repmat(ii,[length(ll),1]); jj = power(beta(G(i,:)+1)+1);% same for the row of G kk = gfmul(ii,jj,tuple); % this is exponential representation of the product ll = gfadd(ll,kk,tuple); end out=zeros(size(ll)); nzindx = find(isfinite(ll)); out(nzindx) = alpha(ll(nzindx)+2); out = out(:); end

这段代码实现了一个基于 LDPC 码的编码器，用于将输入的数据 in 进行编码并输出编码后的结果 out。编码器使用的码字生成矩阵 G 和所使用的有限域 GFq（q=2,4,8,16,32,64,128或256）由函数参数传入。...

ALTER TABLE ORDERS MODIFY TotalCost NUMBER(35,2); DECLARE i_key RAW(32); BEGIN i_key :=UTL_RAW.cast_to_raw('618272'); UPDATE ORDERS SET TotalCost = DBMS_CRYPTO.ENCRYPT( src=>UTL_RAW.CAST_TO_RAW(TO_CHAR(TotalCost)), typ=>DBMS_CRYPTO.AES_CBC_PKCS5, key=>i_key, iv=>NULL ) WHERE TotalCost IS NOT NULL; END; / 出现了 SET TotalCost = DBMS_CRYPTO.ENCRYPT( * ERROR at line 7: ORA-06550: line 7, column 32: PL/SQL: ORA-00932: inconsistent datatypes: expected NUMBER got BINARY ORA-06550: line 6, column 4: PL/SQL: SQL Statement ignored

在 UPDATE 完成之后，我使用 DBMS_CRYPTO.encode 函数将加密后的二进制数据转换为 BASE64 编码，并将结果存储到 v_encrypted_base64 变量中。你可以将 v_encrypted_base64 存储到一个 VARCHAR2 类型的列中。

可以帮助优化以下代码吗：import java.io.Console import response; import request; import http; import java.io.File; import java.io.IOException; import java.nio.file.Files; import com.alibaba.fastjson.JSONObject; import org.apache.commons.codec.binary.Base64; import java.net.URLEncoder; //推送聚会 var juhuiAPIUrl = "http://10.210.26.65:8080/juhuiapi/plugins/notification_service/push_notification?resource=juhui&sysCode=netfault&empNos=%s&msgContent=%s" let itemSubject = "【網絡故障診斷系統】：" + user_name + "主管，" + "【網絡故障診斷系統】有待處理事件，請知悉，謝謝！"; let juhuiParams = { "type": "web", "host": "com.foxconn.netfault", "port": "", "path": "", "title": "netfault", "subTitle": itemSubject, "innerurl": "", "outterurl": "", "param": {} } String base64URLSafeString = Base64.encodeBase64URLSafeString(JSONObject.toJSONString(juhuiParams).getBytes("utf-8")); String base64UrlencodeMsg = URLEncoder.encode(base64URLSafeString, "utf-8"); let juhuiResponse = http.connect(String.format(juhuiAPIUrl, userAccount, base64UrlencodeMsg)).post().getBody();、

import org.apache.commons.codec.binary.Base64 import java.net.URLEncoder // 推送聚会 var juhuiAPIUrl = ...

python encode object

binary_data = pickle.dumps(data) print(binary_data) 输出结果是一个二进制字符串，表示编码后的数据。可以使用pickle.loads()方法将二进制数据反序列化为Python对象： python # 使用pickle模块将二进制...

PAM4 encode

This allows for higher data rates than traditional binary encoding, which only has two levels of amplitude. PAM4 encoding is commonly used in optical communication systems, such as fiber optic ...

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