freemarker初次使用

1.引入jar包

<!--freemarker-->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>

2.spring.xml檔案引入

<bean id="freemarkerConfig"	class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="/WEB-INF/ftl/" />
        <property name="defaultEncoding" value="UTF-8" />
    </bean>

3.demo展示

package com.offcn.page.service.imp;

import com.alibaba.dubbo.config.annotation.Service;
import com.offcn.mapper.TbGoodsDescMapper;
import com.offcn.mapper.TbGoodsMapper;
import com.offcn.mapper.TbItemCatMapper;
import com.offcn.mapper.TbItemMapper;
import com.offcn.page.service.ItemPageService;
import com.offcn.pojo.TbGoods;
import com.offcn.pojo.TbGoodsDesc;
import com.offcn.pojo.TbItem;
import com.offcn.pojo.TbItemExample;
import freemarker.template.Configuration;
import freemarker.template.Template;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfig;

import java.io.FileWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@Service
public class ItemPageServiceImpl implements ItemPageService {
    //引入屬性檔案
    @Value("${pagedir}")
    private String pagedir;

    @Autowired
    private FreeMarkerConfig freeMarkerConfig;

    @Autowired
    private TbGoodsMapper goodsMapper;
    @Autowired
    private TbGoodsDescMapper goodsDescMapper;

    @Autowired
    private TbItemCatMapper itemCatMapper;
    @Autowired
    private TbItemMapper itemMapper;

    @Override
    public boolean genItemHtml(Long goodsId) {
        try {
            //利用介面呼叫方法，實現實現類
            Configuration configuration = freeMarkerConfig.getConfiguration();
            //建立模板物件
            Template template = configuration.getTemplate("item.ftl");
            //定義資料來源
            Map dataModel=new HashMap<>();
            //1.載入商品表資料
            TbGoods goods = goodsMapper.selectByPrimaryKey(goodsId);
            dataModel.put("goods", goods);
            //2.載入商品擴充套件表資料
            TbGoodsDesc goodsDesc = goodsDescMapper.selectByPrimaryKey(goodsId);
            dataModel.put("goodsDesc", goodsDesc);
            //3.商品分類
            String itemCat1 = itemCatMapper.selectByPrimaryKey(goods.getCategory1Id()).getName();
            String itemCat2 = itemCatMapper.selectByPrimaryKey(goods.getCategory2Id()).getName();
            String itemCat3 = itemCatMapper.selectByPrimaryKey(goods.getCategory3Id()).getName();
            dataModel.put("itemCat1", itemCat1);
            dataModel.put("itemCat2", itemCat2);
            dataModel.put("itemCat3", itemCat3);

            //4.SKU列表
            TbItemExample example=new TbItemExample();
            TbItemExample.Criteria criteria = example.createCriteria();
            criteria.andStatusEqualTo("1");//狀態為有效
            criteria.andGoodsIdEqualTo(goodsId);//指定SPU ID
            example.setOrderByClause("is_default desc");//按照狀態降序，保證第一個為預設
            List<TbItem> itemList = itemMapper.selectByExample(example);
            dataModel.put("itemList", itemList);


            Writer out=new FileWriter(pagedir+goodsId+".html");
            template.process(dataModel, out);
            out.close();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}