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In the third stage, the day20 Shopping Cart module is added, the interceptor is added, the user authority is checked, and the order module is realized

2020-11-09 16:55:49 Half bump

  1. Shopping cart delete operation

===========

1.1 Page analysis

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1.2 edit CartController

 `/**
     *  Shopping cart delete operation 
     * url Address : http://www.jt.com/cart/delete/562379.html
     *  Parameters :     obtain itemId
     *  Return value :   Redirect to the presentation page of the shopping cart 
     */
    @RequestMapping("/delete/{itemId}")
    public String deleteCarts(@PathVariable Long itemId){

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



1.3 edit CartService

 `@Override
    public void deleteCarts(Long userId, Long itemId) {
        QueryWrapper<Cart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        queryWrapper.eq("item_id", itemId);
        cartMapper.delete(queryWrapper);
    }` 

  1. Jingtao permissions to achieve

==========

2.1 Business needs

When a user makes sensitive operations , Users must be required to log in before they can access the back-end server . For example, Jingdong Mall …
Using technology :
1.AOP
2. Interceptor : Block user requests
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2.2 Define Jingtao interceptor

2.2.1 SpringMVC Call schematic  Insert picture description here

2.2.2 SpringMVC How interceptors work

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2.2.3 Configure interceptors

`@Component  //spring Container management object 
public class UserInterceptor implements HandlerInterceptor {

    @Autowired
    private JedisCluster jedisCluster;

    //Spring Version update  4  All methods have to be implemented   spring 5  Just override the specified method .

    /**
     *  demand :    Intercept /cart All requests at the beginning are intercepted ., And verify that the user is logged in .....
     *  Interceptor selection : preHandler
     *  How to determine whether a user is logged in :  1. Check cookie Information    2. Check Redis Is there a record in .
     *          true :  The request should be released 
     *          false:  Requests should be blocked   Then with the syntax of redirection, the page will jump to the login page   Make the program flow 

     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1. Determine whether the user is logged in    Check cookie If there is a value 
        String ticket = CookieUtil.getCookieValue(request,"JT_TICKET");
        //2. check ticket
        if(!StringUtils.isEmpty(ticket)){
            //3. Judge redis Is there any value in .
            if(jedisCluster.exists(ticket)){
                //4. Get dynamic json Information 
                String userJSON = jedisCluster.get(ticket);
                User user = ObjectMapperUtil.toObj(userJSON,User.class);
                request.setAttribute("JT_USER",user);
                return true;
            }
        }
        response.sendRedirect("/user/login.html");
        return false;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // Destroy data 
        request.removeAttribute("JT_USER");
    }
}` 


2.2.4 Get dynamic UserId

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2.3 ThreadLocal Introduce

2.3.1 ThreadLocal effect

name : Local thread variables
effect : Can be in the same thread , Realize the sharing of data .
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2.3.2 ThreadLocal Introductory cases

 `private ThreadLocal<Integer> threadLocal = new ThreadLocal<>();
    public void a(){
        int a = 100;
        threadLocal.set(a);
        b();
    }

    public void b(){
        int a = threadLocal.get();
        int b  = 100*a;
    }` 


2.3.3 edit ThreadLocal Tools API

`public class UserThreadLocal {

    //static It doesn't affect threads   threadLocal When a thread is created, it follows .
    //private static ThreadLocal<Map<k,v>> threadLocal = new ThreadLocal<>();
    private static ThreadLocal<User> threadLocal = new ThreadLocal<>();

    public static void set(User user){

        threadLocal.set(user);
    }

    public static User get(){

        return threadLocal.get();
    }

    public static void remove(){

        threadLocal.remove();
    }

}` 


2.3.4 restructure User Interceptor

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2.3.5 Get dynamic UserId

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3. Jingtao order module

3.1 Order form design

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3.2 Create order items

3.2.1 Create project

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3.2.2 Add inheritance dependency

 `<!--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>` 

3.2.3 add to POJO

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Delete orderItem The primary key ID of
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3.2.4 structure jt-order project

The order item code structure is as follows
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3.3 Order confirmation page jumps to

3.3.1 url analysis

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3.3.2 edit OrderController

`package com.jt.controller;

import com.alibaba.dubbo.config.annotation.Reference;
import com.jt.pojo.Cart;
import com.jt.service.DubboCartService;
import com.jt.service.DubboOrderService;
import com.jt.thread.UserThreadLocal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/order")
public class OrderController {

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

    /**
     *  Order page Jump 
     * url: http://www.jt.com/order/create.html
     *  Page value : ${carts}
     */
    @RequestMapping("/create")
    public String create(Model model){

        //1. according to userId Query shopping cart information 
        Long userId = UserThreadLocal.get().getId();
        List<Cart> cartList = cartService.findCartListByUserId(userId);
        model.addAttribute("carts",cartList);
        return "order-cart";
    }
}` 

3.3.3 edit OrderService

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


3.3.4 Page effect display

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3.4 About SpringMVC Parameter submission problem description

3.4.1 Simple parameter transfer problem

1. page url identification

2.Controller The method in
public void xxx(String name,int age){

`}` 



3.4.2 Use object methods to receive parameters

1. page url identification
2.Controller The method in
public void xxx(User user){

`}
public class User{
    private Integer name;
    private String age;
}` 

3.4.3 Use the object's reference to assign values to parameters

difficulty : Attribute's duplicate name submission problem …
Solutions : You can assign values to properties in the form of object references .

`<input  name="name"   value=" Erlang God "    />
<input  name="age"   value="3000"    />
<input  name="dog.name"   value=" Wheezing dog "    />
<input  name="dog.age"   value="8000"    />` 

2.Controller The method in

`public void  xxx(User user){
    
    }
    public class Dog{
        private String name;
        private Integer age;    
    }
    public class User{
        private String name;
        private Integer age;    
        private Dog dog;
    }` 

3.5 About order submission

3.5.1 page URL explain

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3.5.2 Request parameters

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3.5.3 page JS analysis

`jQuery.ajax( {
            type : "POST",
            dataType : "json",
            url : "/order/submit",
            data : $("#orderForm").serialize(),
            // data: {"key":"value","key2":"value2".....}
            // data:  id=1&name="xxx"&age=18......
            cache : false,
            success : function(result) {
                if(result.status == 200){
                    location.href = "/order/success.html?id="+result.data;
                }else{
                    $("#submit_message").html(" Order submission failed , Please try again later ...").show();
                }
            },
            error : function(error) {
                $("#submit_message").html(" Dear users, please do not click frequently ,  Please try again later ...").show();
            }
        });` 


3.5.3 edit OrderController

 `/**
     *  Order submission 
     * url: http://www.jt.com/order/submit
     *  Parameters :  Whole form Forms 
     *  Return value : SysResult object     Carry return value orderId
     *  Business description :
     *    When the order is put into storage , Need to return orderId. Let the user query .
     */
    @RequestMapping("/submit")
    @ResponseBody
    public SysResult saveOrder(Order order){
        Long userId = UserThreadLocal.get().getId();
        order.setUserId(userId);
        String orderId = orderService.saveOrder(order);
        if(StringUtils.isEmpty(orderId))
            return SysResult.fail();
        else
            return SysResult.success(orderId);

    }` 

3.5.4 edit OrderService

`@Service(timeout = 3000)
public class DubboOrderServiceImpl implements DubboOrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderItemMapper orderItemMapper;
    @Autowired
    private OrderShippingMapper orderShippingMapper;

    /**
     * Order{order The order itself /order Logistics information /order Commodity information }
     *  difficulty :   operation 3 Tables complete the warehousing operation 
     *  Primary key information : orderId
     * @param order
     * @return
     */
    @Override
    public String saveOrder(Order order) {
        //1. Splicing OrderId
        String orderId =
                "" + order.getUserId() + System.currentTimeMillis();
        //2. Complete the order warehousing 
        order.setOrderId(orderId).setStatus(1);
        orderMapper.insert(order);

        //3. Complete the order logistics warehousing 
        OrderShipping orderShipping = order.getOrderShipping();
        orderShipping.setOrderId(orderId);
        orderShippingMapper.insert(orderShipping);

        //4. Complete the order goods warehousing 
        List<OrderItem> orderItems = order.getOrderItems();
        // Bulk warehousing   sql: insert into xxx(xxx,xx,xx)values (xx,xx,xx),(xx,xx,xx)....
        for (OrderItem orderItem : orderItems){
            orderItem.setOrderId(orderId);
            orderItemMapper.insert(orderItem);
        }
        System.out.println(" The order has been put into storage successfully !!!!");
        return orderId;
    }
}` 

3.6 Order successfully transferred

3.6.1 page url analysis

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3.6.2 edit OrderController

 `/**
     *  Realize commodity query 
     * 1.url Address : http://www.jt.com/order/success.html?id=71603356409924
     * 2. Parameter description : id  The order no. 
     * 3. return type : success.html
     * 4. Page value method : ${order.orderId}
     */
    @RequestMapping("/success")
    public String findOrderById(String id,Model model){
        Order order = orderService.findOrderById(id);
        model.addAttribute("order",order);
        return "success";
    }` 


3.6.2 edit OrderService

 `@Override
    public Order findOrderById(String id) {
        //1. Query order information 
        Order order  = orderMapper.selectById(id);
        //2. Query order logistics information 
        OrderShipping orderShipping = orderShippingMapper.selectById(id);
        //3. Query order line item 
        QueryWrapper<OrderItem> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("order_id",id);
        List<OrderItem> lists =orderItemMapper.selectList(queryWrapper);
        return order.setOrderItems(lists).setOrderShipping(orderShipping);
    }` 

3.6.3 Page effect display

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4 Project structure chart

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