基于协同过滤算法的高考志愿推荐系统+源代码+文档说明

package com.example.demo.bean; import cn.hutool.core.util.StrUtil; import cn.hutool.crypto.digest.DigestUtil; import cn.hutool.http.HttpUtil; import com.example.demo.entity.LocalFileEntity; import com.example.mx3.bean.PageParam; import com.example.mx3.exception.BizException; import com.example.mx3.utils.SpringUtil; import lombok.AllArgsConstructor; import lombok.Data; import lombok.EqualsAndHashCode; import lombok.experimental.Accessors; import lombok.extern.slf4j.Slf4j; import lombok.var; import org.springframework.web.multipart.MultipartFile; import java.io.ByteArrayInputStream; import java.io.IOException; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.time.LocalDateTime; /** * 文件 */ @Slf4j @Data @Accessors(chain = true) @EqualsAndHashCode(callSuper = true) public class LocalFileBean extends PageParam { /** * ID */ private Long id; /** * 创建时间 */ private LocalDateTime createTime; /** * 更新时间 */ private LocalDateTime updateTime; /** * 文件名称 */ private String filename; /** * 扩展名 */ private String ext; /** * MD5 */ private String md5; /** * 类型 */ private LocalFileTypeEnum type; /** * 内容 */ private byte[] content; @AllArgsConstructor public enum LocalFileTypeEnum { DB, SYSTEM, NET, } public LocalFileBean from(LocalFileEntity entity) { this.id = entity.getId(); this.createTime = entity.getCreateTime(); this.updateTime = entity.getUpdateTime(); this.filename = entity.getFilename(); this.ext = entity.getExt(); this.md5 = entity.getMd5(); this.type = LocalFileTypeEnum.valueOf(entity.getType()); this.content = entity.getContent(); return this; } public LocalFileBean from(MultipartFile file, LocalFileTypeEnum type) { try { return this.from( file.getOriginalFilename(), file.getBytes(), type ); } catch (IOException e) { log.error("文件读取失败>> ", e); throw new BizException("文件读取失败"); } } public LocalFileBean from(String filename, byte[] bs, LocalFileTypeEnum type) { this.filename = filename; if (this.filename == null) { throw new BizException("文件格式不符"); } this.ext = this.filename.substring(this.filename.lastIndexOf(".") + 1); this.md5 = DigestUtil.md5Hex(bs); this.type = type; if (LocalFileTypeEnum.DB.equals(type)) { this.content = bs; } else { String filepath = SpringUtil.getProperty("local-file.path"); Path path; if (StrUtil.isBlank(filepath)) { path = Paths.get(System.getProperty("user.dir")); path = path.getParent(); } else { path = Paths.get(filepath); } path = Paths.get(path.toString(), "file", this.md5.substring(0, 2).toLowerCase()); try { if (Files.notExists(path)) { Files.createDirectories(path); } path = Paths.get(path.toString(), System.currentTimeMillis() + "_" + this.filename); Files.write(path, bs); this.content = path.toString().getBytes(StandardCharsets.UTF_8); } catch (IOException e) { log.error("文件写入失败>> ", e); throw new BizException("文件写入失败"); } } return this; } public LocalFileEntity toEntity() { LocalFileEntity entity = new LocalFileEntity(); entity.setId(this.id); entity.setCreateTime(this.createTime); entity.setUpdateTime(this.updateTime); entity.setFilename(this.filename); entity.setExt(this.ext); entity.setMd5(this.md5); entity.setType(this.type.name()); entity.setContent(this.content); return entity; } public ByteArrayInputStream buildBis() throws IOException { if (LocalFileTypeEnum.DB.equals(this.type)) { return new ByteArrayInputStream(this.content); } if (LocalFileTypeEnum.NET.equals(this.type)) { var bs = HttpUtil.downloadBytes(new String(this.content, Charset.defaultCharset())); return new ByteArrayInputStream(bs); } var path = Paths.get(new String(this.content, StandardCharsets.UTF_8)); var bs = Files.readAllBytes(path); return new ByteArrayInputStream(bs); } public String buildImgContentType() { if ("jpg".equals(ext)) { return "image/" + "jpeg"; } return "image/" + ext; } public String buildContentType() { return ext; } }