嘉兴做网站设计,朋友圈广告推广代理,珠海网页搜索排名提升,杭州建设工程信息网站1、项目功能演示 DC00025【含文档】基于springboot短视频推荐管理系统协同过滤算法视频推荐系统javaweb开发程序设计vue 2、项目功能描述 短视频推荐系统分为用户和系统管理员两个角色
2.1 用户角色
1、用户登录、用户注册 2、视频中心#xff1a;信息查看、视频收藏、点赞、…1、项目功能演示 DC00025【含文档】基于springboot短视频推荐管理系统协同过滤算法视频推荐系统javaweb开发程序设计vue 2、项目功能描述 短视频推荐系统分为用户和系统管理员两个角色
2.1 用户角色
1、用户登录、用户注册 2、视频中心信息查看、视频收藏、点赞、踩、评论 3、公告信息信息查看、收藏、点赞 4、个人信息、修改密码、我的收藏
2.2 管理员角色
1、系统登录 2、个人中心修改密码、个人信息修改 3、用户管理 4、视频中心管理 5、视频分类管理 6、系统管理轮播图管理、公告管理、公告信息分类管理
3、项目运行截图 4、项目核心代码
4.1 公共处理类
package com.utils;import java.util.Random;
import java.util.ArrayList;
import org.springframework.stereotype.Component;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import org.apache.poi.ss.usermodel.DateUtil;
import java.util.Objects;
import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;Component
public class CommonUtil {/*** 获取随机字符串** param num* return*/public static String getRandomString(Integer num) {String base abcdefghijklmnopqrstuvwxyz0123456789;Random random new Random();StringBuffer sb new StringBuffer();for (int i 0; i num; i) {int number random.nextInt(base.length());sb.append(base.charAt(number));}return sb.toString();}/*** 获取随机验证码** param num* return*/public static String getRandomNumber(Integer num) {String base 0123456789;Random random new Random();StringBuffer sb new StringBuffer();for (int i 0; i num; i) {int number random.nextInt(base.length());sb.append(base.charAt(number));}return sb.toString();}public static String getCellValue(Cell cell) {String resultValue ;// 判空if (Objects.isNull(cell)) {return resultValue;}// 拿到单元格类型int cellType cell.getCellType();switch (cellType) {// 字符串类型case Cell.CELL_TYPE_STRING:resultValue StringUtils.isEmpty(cell.getStringCellValue()) ? : cell.getStringCellValue().trim();break;// 布尔类型case Cell.CELL_TYPE_BOOLEAN:resultValue String.valueOf(cell.getBooleanCellValue());break;// 数值类型case Cell.CELL_TYPE_NUMERIC:/*** format 的值可能为以下这些 yyyyMMddHHmmss* yyyy-MM-dd----- 14* yyyy年m月d日----- 31* yyyy年m月--------57* m月d日 -----------58* HH:mm-----------20* h时mm分 --------- 32*/Object val cell.getNumericCellValue();// POI Excel 日期格式转换String formatDate ;switch (cell.getCellStyle().getDataFormat()){case 14:formatDate yyyy-MM-dd;break;case 20:formatDate HH:mm;break;case 21:formatDate HH:mm:ss;break;case 31:formatDate yyyy年MM月dd日;break;case 32:formatDate HH时mm分;break;case 33:formatDate HH时mm分mm秒;break;case 57:formatDate yyyy年MM月;break;case 58:formatDate MM月dd日;break;case 176:formatDate yyyy-MM-dd HH:mm:ss;break;}if(!.equals(formatDate)){resultValue new SimpleDateFormat(formatDate).format(DateUtil.getJavaDate((Double) val));}else{resultValue new DecimalFormat(#.######).format(cell.getNumericCellValue());}break;// 取空串default:break;}return resultValue;}}4.2 加密解密处理类
package com.utils;import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;import cn.hutool.crypto.digest.DigestUtil;public class EncryptUtil {/*** md5算法* param text明文* param key密钥* return 密文*/// 带秘钥加密public static String md5(String text) {if(textnull) return null;// 加密后的字符串String md5str DigestUtil.md5Hex(text);return md5str;}/*** SHA-256算法* param text* return* throws Exception*/public static String sha256(String text) {if(textnull) return null;StringBuilder stringBuilder new StringBuilder();try {//获取SHA-256算法实例MessageDigest messageDigest MessageDigest.getInstance(SHA-256);//计算散列值byte[] digest messageDigest.digest(text.getBytes());//将byte数组转换为15进制字符串for (byte b : digest) {stringBuilder.append(Integer.toHexString((b 0xFF) | 0x100), 1, 3);}} catch (NoSuchAlgorithmException e) {// TODO Auto-generated catch blocke.printStackTrace();}return stringBuilder.toString();}private static final String DES_ALGORITHM DES;/*** DES加密** param data 待加密的数据* param key 密钥长度必须为8位* return 加密后的数据使用Base64编码*/public static String desEncrypt(String text) {if(textnull) return null;try {String key 12345678;// 根据密钥生成密钥规范KeySpec keySpec new DESKeySpec(key.getBytes());// 根据密钥规范生成密钥工厂SecretKeyFactory secretKeyFactory SecretKeyFactory.getInstance(DES_ALGORITHM);// 根据密钥工厂和密钥规范生成密钥SecretKey secretKey secretKeyFactory.generateSecret(keySpec);// 根据加密算法获取加密器Cipher cipher Cipher.getInstance(DES_ALGORITHM);// 初始化加密器设置加密模式和密钥cipher.init(Cipher.ENCRYPT_MODE, secretKey);// 加密数据byte[] encryptedData cipher.doFinal(text.getBytes());// 对加密后的数据进行Base64编码return Base64.getEncoder().encodeToString(encryptedData);} catch (InvalidKeyException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (InvalidKeySpecException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}/*** DES解密** param encryptedData 加密后的数据使用Base64编码* param key 密钥长度必须为8位* return 解密后的数据*/public static String desDecrypt(String text) {if(textnull) return null;try {String key 12345678;// 根据密钥生成密钥规范KeySpec keySpec new DESKeySpec(key.getBytes());// 根据密钥规范生成密钥工厂SecretKeyFactory secretKeyFactory SecretKeyFactory.getInstance(DES_ALGORITHM);// 根据密钥工厂和密钥规范生成密钥SecretKey secretKey secretKeyFactory.generateSecret(keySpec);// 对加密后的数据进行Base64解码byte[] decodedData Base64.getDecoder().decode(text);// 根据加密算法获取解密器Cipher cipher Cipher.getInstance(DES_ALGORITHM);// 初始化解密器设置解密模式和密钥cipher.init(Cipher.DECRYPT_MODE, secretKey);// 解密数据byte[] decryptedData cipher.doFinal(decodedData);// 将解密后的数据转换为字符串return new String(decryptedData);} catch (InvalidKeyException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (InvalidKeySpecException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}private static final String AES_ALGORITHM AES;// AES加密模式为CBC填充方式为PKCS5Paddingprivate static final String AES_TRANSFORMATION AES/CBC/PKCS5Padding;// AES密钥为16位private static final String AES_KEY 1234567890123456;// AES初始化向量为16位private static final String AES_IV abcdefghijklmnop;/*** AES加密** param data 待加密的数据* return 加密后的数据使用Base64编码*/public static String aesEncrypt(String text) {if(textnull) return null;try {// 将AES密钥转换为SecretKeySpec对象SecretKeySpec secretKeySpec new SecretKeySpec(AES_KEY.getBytes(), AES_ALGORITHM);// 将AES初始化向量转换为IvParameterSpec对象IvParameterSpec ivParameterSpec new IvParameterSpec(AES_IV.getBytes());// 根据加密算法获取加密器Cipher cipher Cipher.getInstance(AES_TRANSFORMATION);// 初始化加密器设置加密模式、密钥和初始化向量cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);// 加密数据byte[] encryptedData cipher.doFinal(text.getBytes(StandardCharsets.UTF_8));// 对加密后的数据使用Base64编码return Base64.getEncoder().encodeToString(encryptedData);} catch (InvalidKeyException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidAlgorithmParameterException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}/*** AES解密** param encryptedData 加密后的数据使用Base64编码* return 解密后的数据*/public static String aesDecrypt(String text) {if(textnull) return null;try {// 将AES密钥转换为SecretKeySpec对象SecretKeySpec secretKeySpec new SecretKeySpec(AES_KEY.getBytes(), AES_ALGORITHM);// 将AES初始化向量转换为IvParameterSpec对象IvParameterSpec ivParameterSpec new IvParameterSpec(AES_IV.getBytes());// 根据加密算法获取解密器Cipher cipher Cipher.getInstance(AES_TRANSFORMATION);// 初始化解密器设置解密模式、密钥和初始化向量cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);// 对加密后的数据使用Base64解码byte[] decodedData Base64.getDecoder().decode(text);// 解密数据byte[] decryptedData cipher.doFinal(decodedData);// 返回解密后的数据return new String(decryptedData, StandardCharsets.UTF_8);} catch (InvalidKeyException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidAlgorithmParameterException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}}4.3 基于用户的协同过滤算法
package com.utils;/**
* 类说明 : 基于用户的协同过滤算法
*/import java.util.*;
import java.util.stream.Collectors;public class UserBasedCollaborativeFiltering {private MapString, MapString, Double userRatings;private MapString, ListString itemUsers;private MapString, Integer userIndex;private MapInteger, String indexUser;private Long[][] sparseMatrix;public UserBasedCollaborativeFiltering(MapString, MapString, Double userRatings) {this.userRatings userRatings;this.itemUsers new HashMap();this.userIndex new HashMap();//辅助存储每一个用户的用户索引index映射:user-indexthis.indexUser new HashMap();//辅助存储每一个索引index对应的用户映射:index-user// 构建物品-用户倒排表int keyIndex 0;for (String user : userRatings.keySet()) {MapString, Double ratings userRatings.get(user);for (String item : ratings.keySet()) {if (!itemUsers.containsKey(item)) {itemUsers.put(item, new ArrayList());}itemUsers.get(item).add(user);}//用户ID与稀疏矩阵建立对应关系this.userIndex.put(user,keyIndex);this.indexUser.put(keyIndex,user);keyIndex;}int N userRatings.size();this.sparseMatrixnew Long[N][N];//建立用户稀疏矩阵用于用户相似度计算【相似度矩阵】for(int i0;iN;i){for(int j0;jN;j)this.sparseMatrix[i][j](long)0;}for(String item : itemUsers.keySet()) {ListString userList itemUsers.get(item);for(String u1 : userList) {for(String u2 : userList) {if(u1.equals(u2)){continue;}this.sparseMatrix[this.userIndex.get(u1)][this.userIndex.get(u2)]1;}}}}public double calculateSimilarity(String user1, String user2) {//计算用户之间的相似度【余弦相似性】Integer id1 this.userIndex.get(user1);Integer id2 this.userIndex.get(user2);if(id1null || id2null) return 0.0;return this.sparseMatrix[id1][id2]/Math.sqrt(userRatings.get(indexUser.get(id1)).size()*userRatings.get(indexUser.get(id2)).size());}public ListString recommendItems(String targetUser, int numRecommendations) {// 计算目标用户与其他用户的相似度MapString, Double userSimilarities new HashMap();for (String user : userRatings.keySet()) {if (!user.equals(targetUser)) {double similarity calculateSimilarity(targetUser, user);userSimilarities.put(user, similarity);}}// 根据相似度进行排序ListMap.EntryString, Double sortedSimilarities new ArrayList(userSimilarities.entrySet());sortedSimilarities.sort(Map.Entry.comparingByValue(Comparator.reverseOrder()));// 选择相似度最高的K个用户ListString similarUsers new ArrayList();for (int i 0; i numRecommendations; i) {if (i sortedSimilarities.size()) {similarUsers.add(sortedSimilarities.get(i).getKey());} else {break;}}// 获取相似用户喜欢的物品并进行推荐MapString, Double recommendations new HashMap();for (String user : similarUsers) {MapString, Double ratings userRatings.get(user);for (String item : ratings.keySet()) {if (userRatings.get(targetUser)!null !userRatings.get(targetUser).containsKey(item)) {recommendations.put(item, ratings.get(item));}}}// 排序推荐物品LinkedHashMapString, Double sortedRecommendations new LinkedHashMap(recommendations);// 取前N个推荐物品int numItems Math.min(numRecommendations, sortedRecommendations.size());sortedRecommendations sortedRecommendations.entrySet().stream().sorted((Map.Entry.String, DoublecomparingByValue().reversed())).limit(numItems).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (e1, e2) - e1, LinkedHashMap::new));ListString result new ArrayListString();result.addAll(sortedRecommendations.keySet());return result;}}
4.4 SQL过滤 package com.utils;import org.apache.commons.lang3.StringUtils;import com.entity.EIException;/*** SQL过滤*/
public class SQLFilter {/*** SQL注入过滤* param str 待验证的字符串*/public static String sqlInject(String str){if(StringUtils.isBlank(str)){return null;}//去掉||;|\字符str StringUtils.replace(str, , );str StringUtils.replace(str, \, );str StringUtils.replace(str, ;, );str StringUtils.replace(str, \\, );//转换成小写str str.toLowerCase();//非法字符String[] keywords {master, truncate, insert, select, delete, update, declare, alter, drop};//判断是否包含非法字符for(String keyword : keywords){if(str.indexOf(keyword) ! -1){throw new EIException(包含非法字符);}}return str;}
}4.5 分页工具类 package com.utils;import java.io.Serializable;
import java.util.List;
import java.util.Map;import com.baomidou.mybatisplus.plugins.Page;/*** 分页工具类*/
public class PageUtils implements Serializable {private static final long serialVersionUID 1L;//总记录数private long total;//每页记录数private int pageSize;//总页数private long totalPage;//当前页数private int currPage;//列表数据private List? list;/*** 分页* param list 列表数据* param totalCount 总记录数* param pageSize 每页记录数* param currPage 当前页数*/public PageUtils(List? list, int totalCount, int pageSize, int currPage) {this.list list;this.total totalCount;this.pageSize pageSize;this.currPage currPage;this.totalPage (int)Math.ceil((double)totalCount/pageSize);}/*** 分页*/public PageUtils(Page? page) {this.list page.getRecords();this.total page.getTotal();this.pageSize page.getSize();this.currPage page.getCurrent();this.totalPage page.getPages();}/** 空数据的分页*/public PageUtils(MapString, Object params) {Page page new Query(params).getPage();new PageUtils(page);}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize pageSize;}public int getCurrPage() {return currPage;}public void setCurrPage(int currPage) {this.currPage currPage;}public List? getList() {return list;}public void setList(List? list) {this.list list;}public long getTotalPage() {return totalPage;}public void setTotalPage(long totalPage) {this.totalPage totalPage;}public long getTotal() {return total;}public void setTotal(long total) {this.total total;}}5、项目包含 6、项目获取
6.1 方式一 私聊或者扫描下方名片获取项目文件。 6.2 方式二
点击此处直接获取项目文件。
