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In the third stage, day19 users echo packaged cookie products and remotely call Shopping Cart module crud operation

2020-11-09 16:55:52 Half bump

1. User module implementation

1.1 User information echo

1.1.1 page URL analysis

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1.1.2 Check the page JS

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1.1.3 edit JT-SSO Of Controller

`/**
     *  Business implementation :
     *  1. User pass cookie Information query user data .     adopt ticket obtain redis Business data in .
     *  2.url request : http://sso.jt.com/user/query/+ _ticket
     *  3. Parameters :     Parameter in url in .  utilize restFul obtain 
     *  4. The return value requires : SysResult object (userJSON)
     */
    @RequestMapping("/query/{ticket}")
    public JSONPObject findUserByTicket(@PathVariable String ticket,
                                        HttpServletResponse response,
                                        String callback){

        String userJSON = jedisCluster.get(ticket);
        //1.lru The algorithm clears the data    2. There may be cookie The information is wrong 
        if(StringUtils.isEmpty(userJSON)){
            //2. Should delete cookie Information .
            Cookie cookie = new Cookie("JT_TICKET", "");
            cookie.setMaxAge(0);
            cookie.setDomain("jt.com");
            cookie.setPath("/");
            response.addCookie(cookie);
            return new JSONPObject(callback,SysResult.fail());
        }
        return new JSONPObject(callback,SysResult.success(userJSON));
    }` 

1.2 edit Cookie Tools API

`package com.jt.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieUtil {

    //1. newly added cookie
    public static void addCookie(HttpServletResponse response,String cookieName, String cookieValue, int seconds, String domain){
        Cookie cookie = new Cookie(cookieName,cookieValue);
        cookie.setMaxAge(seconds);
        cookie.setDomain(domain);
        cookie.setPath("/");
        response.addCookie(cookie);
    }

    //2. according to name Inquire about value Value 
    public static String getCookieValue(HttpServletRequest request,String cookieName){

        Cookie[] cookies = request.getCookies();
        if(cookies !=null && cookies.length >0){
            for (Cookie cookie : cookies){
                if(cookieName.equals(cookie.getName())){
                    return cookie.getValue();
                }
            }
        }
        return null;
    }

    //3. Delete cookie
    public static void deleteCookie(HttpServletResponse response,String cookieName,String domain){

        addCookie(response,cookieName,"",0, domain);
    }
}` 


1.3 User exit operation

1.3.1 Business description

If the user clicks exit operation , First of all, we should delete Redis Data in Next delete Cookie Data in Then redirect to the system home page .

1.3.2 URL analysis

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1.3.3 edit UserController

 `/**
     *  User exit operation . Redirect to system home page 
     * url: http://www.jt.com/user/logout.html
     *  Business :
     *      1. Delete Redis Data in   key
     *      2. Delete Cookie Record 
     */
    @RequestMapping("logout")
    public String logout(HttpServletRequest request,HttpServletResponse response){
        //1. according to JT_TICKET Get the specified ticket
        String ticket = CookieUtil.getCookieValue(request,"JT_TICKET");

        //2. Judge ticket Is it null
        if(!StringUtils.isEmpty(ticket)){
            jedisCluster.del(ticket);
            CookieUtil.deleteCookie(response,"JT_TICKET","jt.com");
        }

        return "redirect:/";
    }` 


2 Realize the display of product details

2.1 Business description

explain : When a user clicks on a product , Need to jump to the product display page Page name item.jsp
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2.2 restructure JT-MANAGE

2.2.1 Create an interface

explain : stay jt-common Create interface in
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2.2.2 edit Dubbo Implementation class

`package com.jt.service;

import com.alibaba.dubbo.config.annotation.Service;
import com.jt.mapper.ItemDescMapper;
import com.jt.mapper.ItemMapper;
import com.jt.pojo.Item;
import com.jt.pojo.ItemDesc;
import org.springframework.beans.factory.annotation.Autowired;

@Service(timeout = 3000)
public class DubboItemServiceImpl implements DubboItemService{

    @Autowired
    private ItemMapper itemMapper;
    @Autowired
    private ItemDescMapper itemDescMapper;

    @Override
    public Item findItemById(Long itemId) {

        return itemMapper.selectById(itemId);
    }

    @Override
    public ItemDesc findItemDescById(Long itemId) {

        return itemDescMapper.selectById(itemId);
    }
}` 

2.2.3 edit YML The configuration file

`server:
  port: 8091
  servlet:
    context-path: /
spring:
  datasource:
    # introduce druid data source 
    #type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/jtdb?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
    username: root
    password: root

  mvc:
    view:
      prefix: /WEB-INF/views/
      suffix: .jsp
#mybatis-plush To configure 
mybatis-plus:
  type-aliases-package: com.jt.pojo
  mapper-locations: classpath:/mybatis/mappers/*.xml
  configuration:
    map-underscore-to-camel-case: true

logging:
  level: 
    com.jt.mapper: debug

# About Dubbo To configure 
dubbo:
  scan:
    basePackages: com.jt    # Appoint dubbo The package path of   scanning dubbo annotation 
  application:              # apply name 
    name: provider-manage     # An interface corresponds to a service name     An interface can have multiple implementations 
  registry:  # Registry Center   The user gets the data from the machine   The host is only responsible for monitoring the entire cluster   Data synchronization 
    address: zookeeper://192.168.126.129:2181?backup=192.168.126.129:2182,192.168.126.129:2183
  protocol:  # Designated agreement 
    name: dubbo  # Use dubbo agreement (tcp-ip)  web-controller Call directly sso-Service
    port: 20881  # Each service has its own specific port   Can't repeat .` 

2.2.4 edit ItemController

`package com.jt.controller;

import com.alibaba.dubbo.config.annotation.Reference;
import com.jt.pojo.Item;
import com.jt.pojo.ItemDesc;
import com.jt.service.DubboItemService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/items")
public class ItemController {

    @Reference(timeout = 3000)
    private DubboItemService itemService;

    /**
     *  Realize product details page Jump 
     * url: http://www.jt.com/items/562379.html
     *  Parameters : 562379 itemId
     *  Return value :  item.jsp page 
     *  Page value description :
     *      ${item.title }   item object 
     *      ${itemDesc.itemDesc }  itemDesc object 
     *
     *  Ideas :
     *      1. restructure jt-manage project 
     *      2. Create a neutral interface DubboItemService
     *      3. Achieve business call acquisition item/itemDesc object 
     */
    @RequestMapping("/{itemId}")
    public String findItemById(@PathVariable Long itemId, Model model){

        Item item = itemService.findItemById(itemId);
        ItemDesc itemDesc = itemService.findItemDescById(itemId);
        // Save data to request domain 
        model.addAttribute("item",item);
        model.addAttribute("itemDesc",itemDesc);
        return "item";
    }
}` 

2.2.5 Page effect display

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3 Shopping Cart module implementation

3.1 Create service provider

3.1.1 Create project JT-CART

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3.1.2 Add inheritance / rely on / plug-in unit

 `<!--2. Add dependency information -->
    <dependencies>
        <!-- What depends essentially on is jar Package file -->
        <dependency>
            <groupId>com.jt</groupId>
            <artifactId>jt-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <!--3. Add the plug-in -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>` 


3.1.3 edit POJO object

`@TableName("tb_cart")
@Data
@Accessors(chain = true)
public class Cart extends BasePojo{  // Use packaging type 

    @TableId(type = IdType.AUTO)
    private Long id;
    private Long uesrId;        // user ID Number 
    private Long itemId;        // goods ID Number 
    private String itemTitle;   // Commodity title 
    private String itemImage;   // picture 
    private Long itemPrice;     // commodity price 
    private Integer num;        // The number 

}` 


3.1.4 edit CartService Interface

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3.1.5 jt-cart The code structure

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3.2 Shopping cart list page shows

3.2.1 page url analysis

explain : When the user clicks on the shopping cart button , Need to jump to the cart display page . cart.jsp
Page value : ${cartList}
requirement : Query only userId=7 Shopping cart list information for . After that, the page will be displayed
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3.2.2 edit CartController

`package com.jt.controller;

import com.alibaba.dubbo.config.annotation.Reference;
import com.jt.pojo.Cart;
import com.jt.service.DubboCartService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/cart")
public class CartController {

    @Reference(timeout = 3000,check = false)
    private DubboCartService cartService;

    /**
     *  Business needs :  according to userId Query shopping cart data 
     * url Address : http://www.jt.com/cart/show.html
     *  Request parameters :  Get dynamic userId
     *  Return value result :  cart.jsp page 
     *  Page value method : ${cartList}
     */
    @RequestMapping("/show")
    public String findCartListByUserId(Model model){
        Long userId = 7L;
        List<Cart> cartList = cartService.findCartListByUserId(userId);
        model.addAttribute("cartList",cartList);
        return "cart";
    }
}` 

3.2.3 edit CartService

`package com.jt.service;

import com.alibaba.dubbo.config.annotation.Service;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.jt.mapper.CartMapper;
import com.jt.pojo.Cart;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

@Service
public class DubboCartServiceImpl implements DubboCartService{

    @Autowired
    private CartMapper cartMapper;

    @Override
    public List<Cart> findCartListByUserId(Long userId) {
        QueryWrapper<Cart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        return cartMapper.selectList(queryWrapper);
    }
}` 


3.2.4 Page effect display

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3.3 Modification of the number of shopping carts

3.3.1 Business description

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3.3.2 page JS analysis

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3.3.3 edit CartController

 `/**
     *  Business :  Update the number of shopping carts 
     * url: http://www.jt.com/cart/update/num/562379/12
     *  Parameters : itemId/num
     *  Return value : void
     */
    @RequestMapping("/update/num/{itemId}/{num}")
    @ResponseBody  //1. The return value is converted to json 2.ajax End identification 
    public void updateCartNum(Cart cart){ //key The name must match the name of the property .

        Long userId = 7L;
        cart.setUserId(userId);
        cartService.updateCartNum(cart);
    }` 

3.3.4 edit CartService

 `@Override
    public void updateCartNum(Cart cart) {

        //cartMapper.updateCartNum(cart);
        //1. Ready to modify the data    According to the object is not null The elements of as set Conditions 
        Cart cartTemp = new Cart();
        cartTemp.setNum(cart.getNum());

        //2. According to the object is not null The elements of as where Conditions 
        UpdateWrapper<Cart> updateWrapper =
                        new UpdateWrapper<>(cart.setNum(null));
        /*updateWrapper.eq("user_id", cart.getUserId())
                     .eq("item_id", cart.getItemId());*/
        cartMapper.update(cartTemp,updateWrapper);

    }` 

3.3.5 edit CartMapper

`public interface CartMapper extends BaseMapper<Cart> {
    @Update("update tb_cart set num = #{num},updated=now() where user_id=#{userId} and item_id=#{itemId}")
    void updateCartNum(Cart cart);
}` 

*   1
*   2
*   3
*   4

3.4 Shopping cart added

3.4.1 Shopping cart new business

When the user clicks the shopping cart button, the shopping cart is put into storage . If the user makes repeated purchases, the number of items in the shopping cart should be modified .
After the success of the purchase , Should be redirected to the shopping cart list page .

3.4.2 Page analysis

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3.4.3 Page form submission

`<form id="cartForm" method="post">
                                    <input class="text" id="buy-num" name="num" value="1" onkeyup="setAmount.modify('#buy-num');"/>
                                    <input type="hidden" class="text"  name="itemTitle" value="${item.title }"/>
                                    <input type="hidden" class="text" name="itemImage" value="${item.images[0]}"/>
                                    <input type="hidden" class="text" name="itemPrice" value="${item.price}"/>
                                </form>` 

3.4.4 page JS analysis

`<a class="btn-append " id="InitCartUrl" onclick="addCart();" clstag="shangpin|keycount|product|initcarturl"> Add to cart <b></b></a>
// utilize post Pass value 
        function addCart(){
            var url = "http://www.jt.com/cart/add/${item.id}.html";
            document.forms[0].action = url;        //js Set submit link 
            document.forms[0].submit();            //js Form submission 
        }` 

3.4.5 edit CartController

 `/**
     *  Complete shopping cart addition 
     * url: http://www.jt.com/cart/add/562379.html
     *  Parameters : form Form submission    Object reception 
     *  Return value :  Redirect to cart list page 
     */
    @RequestMapping("/add/{itemId}")
    public String saveCart(Cart cart){

        Long userId = 7L;
        cart.setUserId(userId);
        cartService.saveCart(cart);
        return "redirect:/cart/show.html";
    }` 



3.4.6 edit CartService

`/**
     *   If repeat purchase, update quantity 
     * 1. Query whether the data has been changed  user_id/item_id
     */
    @Override
    public void saveCart(Cart cart) {
        QueryWrapper<Cart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", cart.getUserId())
                    .eq("item_id", cart.getItemId());
        Cart cartDB = cartMapper.selectOne(queryWrapper);
        if(cartDB == null){
            // The first time the user bought 
            cartMapper.insert(cart);
        }else {
            // The user needs to modify the quantity 
            int num = cart.getNum() + cartDB.getNum();
            cart.setNum(num);
            cartMapper.updateCartNum(cart);
        }
    }` 

3.4.6 Page effects

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