Servlet代码优化-使用

package com.itheima.web.servlet;


import com.alibaba.fastjson.JSON;
import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;
import com.itheima.service.impl.BrandServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;

@WebServlet("/brand/*")
public class BrandServlet extends BaseServlet{

    private BrandService brandService = new BrandServiceImpl();

    public void selectAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 调用service查询
        List<Brand> brands = brandService.selectAll();

        //2. 转为JSON
        String jsonString = JSON.toJSONString(brands);

        //3. 写数据
        response.setContentType("text/json;charset=utf-8");
        response.getWriter().write(jsonString);

    }

    public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
        //1. 接受品牌数据
        BufferedReader br = request.getReader();
        String params = br.readLine();//json字符串

        //2. 转为Brand对象
        Brand brand = JSON.parseObject(params, Brand.class);

        //3. 调用service添加
        brandService.add(brand);

        //4. 添加成功，响应标识
        response.getWriter().write("success");

    }

}