需要的pom

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

代码：

package com.changgou.web.item.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.goods.feign.CategoryFeign;
import com.changgou.goods.feign.GoodsFeign;
import com.changgou.goods.feign.SpuFeign;
import com.changgou.pojo.Category;
import com.changgou.pojo.Sku;
import com.changgou.pojo.Spu;
import com.changgou.web.item.service.ItemService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.io.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * @author ：gzy
 * @date ：Created in 2019/8/25
 * @description ：
 * @version: 1.0
 */
@Service
public class ItemServiceImpl implements ItemService {
//在application.yml有配置,存放静态页的地方
//pagepath: D:\GitJavaProgects\ChangGou\changgou_parent\changgou_web\changgou_web_item\src\main\resources\templates\items
    @Value("${pagepath}")
    private String pagePath;
    @Autowired
    private TemplateEngine templateEngine;
    @Autowired
    private SpuFeign spuFeign;
    @Autowired
    private CategoryFeign categoryFeign;
    @Autowired
    private GoodsFeign goodsFeign;
    @Override
    public void staticPage(String spuid) {
        Map map = new HashMap<>();
        Spu spu = spuFeign.findSpuByid(spuid);
        map.put("spu",spu);
        //查分类
        Category category1 = categoryFeign.findCategoryById(spu.getCategory1Id());
        Category category2 = categoryFeign.findCategoryById(spu.getCategory2Id());
        Category category3 = categoryFeign.findCategoryById(spu.getCategory3Id());
        map.put("category1",category1);
        map.put("category2",category2);
        map.put("category3",category3);
        //查照片
        String images = spu.getImages();
        if(!StringUtils.isEmpty(images)){
            String[] img = images.split(",");
            map.put("imageList",img);
        }
        //查库存
        List<Sku> skuList = goodsFeign.findBySpuId(spuid);
        map.put("skuList",skuList);
        //查规格
        String specItems = spu.getSpecItems();
        //不指定map类型，它自动转为string，list
        Map specmap = JSON.parseObject(specItems, Map.class);
        map.put("specificationList",specmap);

        Context context = new Context();
        context.setVariables(map);
        //流
        File file = new File(pagePath);
        if(!file.exists()){
            file.mkdirs();
        }
        Writer writer = null;
        try {
            writer = new PrintWriter(pagePath + "/" + spuid + ".html","utf-8");//乱码
//Thymeleaf生成静态页
            templateEngine.process("item",context,writer);
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            if(writer!=null){
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }


    }
}