今天尝试使用visio画了一个序列图。

话不多说，先打开visio，新建一个UML序列。

先新建几个对象生命线

加入几个激活

而后是消息，实线表示请求，虚线表示响应。

当然如果不影响理解，可以不用每个请求都配上一个响应。

此UML例子是在《UML精粹：标准对象建模语言简明指南》中拿过来的，为了更好的理解这个UML，下面使用java来实现此UML。

ps，源码上传到码云了。https://gitee.com/xixiw777/sequenceDiagramhttps://gitee.com/xixiw777/sequenceDiagram

• procuct

package com.simon.uml.sequenceDiagram;/*** Created by IntelliJ IDEA.** @author: Simon* @date: 2019-05-09* @time: 14:50* @description:产品*/
public class Product {private String name;private double price;public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public double getPrice(int number) {double orderLinePrice = price * number;System.out.println("product name:" + getName()+ "\tprice:" + getPrice()+ "\tnumber:" + number+ "\torder line price:" + orderLinePrice);return orderLinePrice;}public void setPrice(double price) {this.price = price;}
}

• customer

package com.simon.uml.sequenceDiagram;/*** Created by IntelliJ IDEA.** @author: Simon* @date: 2019-05-09* @time: 14:51* @description:客户*/
public class Customer {private double discount;public double getDiscountedValue(Order order) {return discount * order.getBaseValue();}public double getDiscount() {return discount;}public void setDiscount(double discount) {this.discount = discount;}
}

• order

package com.simon.uml.sequenceDiagram;import java.util.List;/*** Created by IntelliJ IDEA.** @author: Simon* @date: 2019-05-09* @time: 14:50* @description:订单*/
public class Order {private double baseValue;private Customer customer;private List<OrderLine> orderLineList;public double calculatePrice() {double sumOrderLinePrice = 0;for (OrderLine orderLine : orderLineList) {double orderLinePrice = orderLine.calculatePrice();sumOrderLinePrice += orderLinePrice;}this.setBaseValue(sumOrderLinePrice);System.out.println("order base price:" + sumOrderLinePrice);double discountedValue = getCustomer().getDiscountedValue(this);System.out.println("order discounted price:" + discountedValue);return discountedValue;}public double getBaseValue() {return baseValue;}public void setBaseValue(double baseValue) {this.baseValue = baseValue;}public List<OrderLine> getOrderLineList() {return orderLineList;}public void setOrderLineList(List<OrderLine> orderLineList) {this.orderLineList = orderLineList;}public Customer getCustomer() {return customer;}public void setCustomer(Customer customer) {this.customer = customer;}
}

order line

package com.simon.uml.sequenceDiagram;/*** Created by IntelliJ IDEA.** @author: Simon* @date: 2019-05-09* @time: 14:50* @description:订单明细*/
public class OrderLine {private int number;private Product product;public OrderLine(int number, Product product) {this.number = number;this.product = product;}public double calculatePrice() {return product.getPrice(number);}public int getNumber() {return number;}public void setNumber(int number) {this.number = number;}public Product getProduct() {return product;}public void setProduct(Product product) {this.product = product;}
}

• order的测试用例

package com.simon.uml.sequenceDiagram;import org.junit.Assert;import java.util.ArrayList;
import java.util.List;/*** Created by IntelliJ IDEA.** @author: Simon* @date: 2019-05-09* @time: 15:23* @description:*/
public class OrderTest {@org.junit.Testpublic void calculatePrice() {//这个商品是鞋子,123块钱一双Product productShoes = new Product();productShoes.setName("shoes");productShoes.setPrice(123);//这个商品是袜子,8块钱一双Product productSocket = new Product();productSocket.setName("socket");productSocket.setPrice(8);//这是一个老客户，打七折Customer customer = new Customer();customer.setDiscount(0.7);//这个客户下了一个单Order order = new Order();order.setCustomer(customer);//买了一双鞋子，两双袜子OrderLine orderLineShoes = new OrderLine(1, productShoes);OrderLine orderLineSocket = new OrderLine(2, productSocket);List<OrderLine> orderLineList = new ArrayList<OrderLine>();orderLineList.add(orderLineShoes);orderLineList.add(orderLineSocket);order.setOrderLineList(orderLineList);//算一算总共多少钱double priceActual = order.calculatePrice();Assert.assertEquals("97.3", String.valueOf(priceActual));}
}

• 测试用例的输出

product name:shoes     price:123.0    number:1    order line price:123.0
product name:socket    price:8.0        number:2    order line price:16.0
order base price:139.0
order discounted price:97.3