图书详情类创建完后HTTP Status 404 – 未找到

# 具体遇到的问题

# 相关课程内容截图



# 尝试过的解决思路和结果

# 粘贴全部相关代码，切记添加代码注释（请勿截图）

实体类：

@TableName("evaluation")
public class Evaluation {
@TableId(type = IdType.AUTO)
private Long evaluationId;
private Long bookId;
private String content;
private Integer score;
private Long memberId;
private Date createTime;
private Integer enjoy;
private String state;
private String disableReason;
private Date disableTime;

public Long getEvaluationId() {
return evaluationId;
    }

public void setEvaluationId(Long evaluationId) {
this.evaluationId = evaluationId;
    }

public Long getBookId() {
return bookId;
    }

public void setBookId(Long bookId) {
this.bookId = bookId;
    }

public String getContent() {
return content;
    }

public void setContent(String content) {
this.content = content;
    }

public Integer getScore() {
return score;
    }

public void setScore(Integer score) {
this.score = score;
    }

public Long getMemberId() {
return memberId;
    }

public void setMemberId(Long memberId) {
this.memberId = memberId;
    }

public Date getCreateTime() {
return createTime;
    }

public void setCreateTime(Date createTime) {
this.createTime = createTime;
    }

public Integer getEnjoy() {
return enjoy;
    }

public void setEnjoy(Integer enjoy) {
this.enjoy = enjoy;
    }

public String getState() {
return state;
    }

public void setState(String state) {
this.state = state;
    }

public String getDisableReason() {
return disableReason;
    }

public void setDisableReason(String disableReason) {
this.disableReason = disableReason;
    }

public Date getDisableTime() {
return disableTime;
    }

public void setDisableTime(Date disableTime) {
this.disableTime = disableTime;
    }
}

mapper：

package com.imooc.reader.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.imooc.reader.entity.Evaluation;

public interface EvaluationMapper extends BaseMapper<Evaluation> {

}

mapper.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.imooc.reader.mapper.EvaluationMapper">

</mapper>

service:

package com.imooc.reader.service;

import com.imooc.reader.entity.Evaluation;

import java.util.List;

public interface EvaluationService {

/**
     * 按照图书ID查看短评
     */
    public List<Evaluation>  selectByBookId(Long bookId);
}

impl:

package com.imooc.reader.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.imooc.reader.entity.Evaluation;
import com.imooc.reader.mapper.EvaluationMapper;
import com.imooc.reader.service.EvaluationService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;
@Service("evaluationService")
@Transactional(propagation = Propagation.NOT_SUPPORTED,readOnly = true)

public class EvaluationServiceImpl implements EvaluationService {
@Resource
    private EvaluationMapper evaluationMapper;




/**
     * 按照图书ID查看短评
     */
    public List<Evaluation> selectByBookId(Long bookId) {
QueryWrapper<Evaluation> queryWrapper =new QueryWrapper<Evaluation>();
queryWrapper.eq("book_id",bookId);
queryWrapper.eq("state","enable");
queryWrapper.orderByDesc("create_time");
List<Evaluation> evaluationList = evaluationMapper.selectList(queryWrapper);
return evaluationList;
    }
}

​controller:

package com.imooc.reader.controller;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.imooc.reader.entity.Book;
import com.imooc.reader.entity.Category;
import com.imooc.reader.entity.Evaluation;
import com.imooc.reader.service.BookService;
import com.imooc.reader.service.CategoryService;
import com.imooc.reader.service.EvaluationService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import java.util.List;

@Controller
public class BookController {
@Resource
    private CategoryService categoryService;
@Resource
    private BookService bookService;
@Resource
    private EvaluationService evaluationService;

/**
     * 显示首页
     * @return
     */
    @GetMapping("/")
public ModelAndView showIndex() {
ModelAndView mav = new ModelAndView("/index");
List<Category> categorylist = categoryService.selectAll();
mav.addObject("categoryList",categorylist);

return mav;
    }

/**
     * 加载书籍
     */
    @GetMapping("/books")
@ResponseBody
    public IPage<Book> selectBook(Long categoryId,String order,Integer p){
if(p==null){
            p=1;
        }
IPage<Book> pageObject = bookService.paging(categoryId,order,p,10);
return pageObject;
    }


/**
     * 根据图书编号查书的对象
     */
    @GetMapping("/book/{id}")
public ModelAndView showDetail(@PathVariable("id") Long id){
Book book =bookService.selectById(id);
List<Evaluation> evaluationList = evaluationService.selectByBookId(id);
ModelAndView mav = new ModelAndView("/detail");
mav.addObject("book",book);
mav.addObject("evaluationList",evaluationList);
return mav;
    }
}