SpringCloud学习笔记（二、单体架构实例）

2021-12-20 142

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简介： SpringCloud学习笔记（二、单体架构实例）

文章目录

改进

单体架构实例

在Idea里新建一个SpringBoot项目，这里选择SpringBoot 的版本依赖是 2.0.3.RELEASE。

依赖
pom.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>edu.hpu</groupId>
  <artifactId>product-service</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <name>product-service</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <optional>true</optional> <!-- 配置为true 热部署才有效 -->
    </dependency>
    <dependency>         <!--配置hutool工具包-->
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
      <version>4.3.1</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

启动类ProducServicetApplication:

package edu.hpu;
import cn.hutool.core.util.NetUtil;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
@SpringBootApplication
public class ProductServiceApplication {
    public static void main(String[] args){
        int port=8080;         //端口号
        if(!NetUtil.isUsableLocalPort(port)){
            System.err.printf("端口%d被占用了，无法启动%n", port );
            System.exit(1);
        }
        new SpringApplicationBuilder(ProductServiceApplication.class).properties("server.port=" + port).run(args);
    }
}

实体类Product:

package edu.hpu.pojo;
public class Product {
    private int id;
    private String name;
    private int  price;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public Product(int id, String name, int price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    @Override
    public String toString() {
        return "Product{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                '}';
    }
}

服务层ProcuctService:
为了降低代码量，这里数据直接放在内存里，不再引入数据库。

package edu.hpu.service;
import edu.hpu.pojo.Product;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Service
public class ProductService {
    public List<Product> listProducts(){
      List<Product> products=new ArrayList<>();
      products.add(new Product(1,"锤子",11));
      products.add(new Product(2,"斧头",23));
      products.add(new Product(3,"棒子",33));
      return products;
    }
}

控制层ProductController:

package edu.hpu.controller;
import edu.hpu.pojo.Product;
import edu.hpu.service.ProductService;
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
public class ProductController {
    @Autowired
    private ProductService productService;
    @RequestMapping("/procucts")
    public Object products(Model m){
        List<Product> ps = productService.listProducts();
        m.addAttribute("ps", ps);
        return "products";
    }
}

视图products.html:
这里用的是thymeleaf模板来编写我们的前端

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        table {
            border-collapse:collapse;
            width:400px;
            margin:20px auto;
        }
        td,th{
            border:1px solid gray;
        }
    </style>
</head>
<body>
   <div id="container">
       <table>
           <thead>
           <th>编号</th>
           <th>名称</th>
           <th>价格</th>
           </thead>
           <tbody>
           <tr th:each="p: ${ps}">
               <td th:text="${p.id}"></td>
               <td th:text="${p.name}"></td>
               <td th:text="${p.price}"></td>
           </tr>
           </tbody>
       </table>
   </div>
</body>
</html>

配置application.properties

#thymeleaf 配置
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
#缓存设置为false, 这样修改之后马上生效，便于调试
spring.thymeleaf.cache=false
#上下文
server.context-path=/