[黑马程序员SpringBoot2]——开发实用篇1

news/2024/7/16 8:32:52 标签: pycharm, ide, python

目录：

  1. 手工启动热部署
  2. 自动启动热部署
  3. 热部署范围配置
  4. 关闭热部署功能
  5. 第三方bean属性绑定
  6. 松散绑定
  7. 常用计量单位应用
  8. bean属性校验
  9. 进制数据转换规则
  10. 加载测试专用属性
  11. 加载测试专用配置
  12. 测试类中启动web环境
  13. 发送虚拟请求
  14. 匹配响应执行状态
  15. 匹配响应体
  16. 匹配响应体(json)
  17. 匹配响应头
  18. 业务层测试事务回滚
  19. 测试用例设置随机数据
  20. 内置数据源
  21. JdbcTemplate
  22. H2数据库
  23. redis下载安装与基本使用
  24. SpringBoot整合Redis
  25. Springboot读写Redis的客户端
  26. Sprintboot操作Redis客户端实现技术切换（jedis）

1.手工启动热部署

开启开发者工具

激活热部署：Ctrl + F9 

关于热部署
  • 重启（Restart）：自定义开发代码，包含类、页面、配置文件等，加载位置restart类加载器
  • 重载（ReLoad）：jar包，加载位置base类加载器

小结：

  • 开启开发者工具后启用热部署
  • 使用构建项目操作启动热部署(Ctrl+F9)
  • 热部署仅仅加载当前开发者自定义开发的资源，不加载jar资源 

2.自动启动热部署 

设置自动构建项目

ctrl+alt+shift+/ 

激活方式：Idea失去焦点5秒后启动热部署 

热部署Idea专业版spring boot(spring mvc)项目_idea springmvc 热部署-CSDN博客

3.热部署范围配置 

默认不触发重启的目录列表

  • /META-INF/maven
  • /META-INF/resources
  • /resources
  • /static
  • /public
  • /templates

自定义不参与重启排除项 

4.关闭热部署功能

属性加载优先顺序

设置高优先级属性禁用热部署

5.第三方bean属性绑定

使用 @ ConfigurationProperties 为第三方 bean 绑定属性

@EnableConfigurationProperties注解可以将使用@ConfigurationProperties注解对应的类加入Spring容器

 

注意事项

  • @EnableConfigurationProperties.与@Component不能同时使用 

解除使用@ConfigurationProperties注释警告

6.松散绑定 

@ ConfigurationProperties 绑定属性支持属性名宽松绑定

注意事项

  • 宽松绑定不支持注解@Value引用单个属性的方式 

@ConfigurationProperties绑定属性支持属性名宽松绑定 

注意事项

  • 绑定前缀名命名规范:仅能使用纯小写字母、数字、下划线作为合法的字符 

7.常用计量单位应用

SpringBoot 支持 JDK8 提供的时间与空间计量单位

JDK8支持的时间与空间计量单位 

8.bean属性校验

数据校验

  • 开启数据校验有助于系统安全性，J2EE规范中7SR303规范定义了一组有关数据校验相关的API

添加JSR3日3规范坐标与Hibernate校验框架对应坐标

对Bean开启校验功能

设置校验规则

9.进制数据转换规则 

字面值表达方式

application.yml

servers:
  ipAddress: 192.168.0.1
  #  ipaddress: 192.168.0.1
  #  ip_address: 192.168.0.1
  #  ip-address: 192.168.0.1
  #  IPADDRESS: 192.168.0.1
  #  IP_ADD_R-E_SS: 192.168.0.1
  port: 4444
  timeout: -1
  serverTimeOut: 3
  dataSize: 10240

dataSource:
  driverClassName: com.mysql.jdbc.Driver456
  password: 0127

 ApplicationTests

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class ApplicationTests {
    @Value("${dataSource.password}")
    private String password;


    @Value("${servers.ipAddress}")
    private String msg;

    @Test
    void contextLoads() {
        System.out.println(msg);
        System.out.println(password);
    }

}

运行结果：（0127）转换成了8进制

10.加载测试专用属性

在启动测试环境时可以通过properties参数设置测试环境专用的属性

优势:比多环境开发中的测试环境影响范围更小，仅对当前测试类有效 

在启动测试环境时可以通过args参数设置测试环境专用的传入参数

Sprintboot14TestApplicationTests

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;

//@SpringBootTest(properties = {"test.prop=testValue1"})
//@SpringBootTest(args = {"--test.prop=testValue2"})
@SpringBootTest(properties = {"test.prop=testValue1"}, args = {"--test.prop=testValue2"})
class Sprintboot14TestApplicationTests {

    @Value("${test.prop}")
    private String msg;

    @Test
    void contextLoads() {
        System.out.println(msg);
    }
}

 application.yml

test:
  prop: testValue

11.加载测试专用配置

使用@Import注解加载当前测试类专用的配置

MsgConfig.class

package com.example.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MsgConfig {
    @Bean
    public String msg() {
        return "bean msg";
    }
}

ConfigurationTest.class

package com.example;

import com.example.config.MsgConfig;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.annotation.Import;

@SpringBootTest
@Import({MsgConfig.class})
public class ConfigurationTest {
    @Autowired
    private String msg;

    @Test
    void testConfiguration() {
        System.out.println(msg);
    }
}

运行结果：

12.测试类中启动web环境 

模拟端口

WebTest.class

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class WebTest {
    @Test
    void test() {

    }
}

 13.发送虚拟请求

 虚拟请求测试

BookController.class

package com.example.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/books")
public class BookController {
    @GetMapping
    public String getById() {
        System.out.println("getById is running...");
        return "sprintboot";
    }
}

WebTest.class

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@AutoConfigureMockMvc
public class WebTest {
    @Test
    void test() {

    }

    @Test
    void testWeb(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        mvc.perform(builder);
    }
}

运行结果：

14.匹配响应执行状态

虚拟请求状态匹配

WebTest.class

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.ResultMatcher;
import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.result.StatusResultMatchers;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@AutoConfigureMockMvc
public class WebTest {
    @Test
    void testWeb(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        mvc.perform(builder);
    }

    @Test
    void testStatus(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        StatusResultMatchers status = MockMvcResultMatchers.status();
        ResultMatcher ok = status.isOk();

        action.andExpect(ok);
    }
}

15.匹配响应体

虚拟请求响应体匹配 

WebTest.class

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.ResultMatcher;
import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.ContentResultMatchers;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.result.StatusResultMatchers;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@AutoConfigureMockMvc
public class WebTest {
    @Test
    void testWeb(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        mvc.perform(builder);
    }

    @Test
    void testStatus(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        StatusResultMatchers status = MockMvcResultMatchers.status();
        ResultMatcher ok = status.isOk();

        action.andExpect(ok);
    }

    @Test
    void testBody(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.string("springboot");

        action.andExpect(result);
    }
}

16.匹配响应体(json)

虚拟请求响应体(json)匹配

BookController.class

package com.example.controller;

import com.example.domain.Book;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/books")
public class BookController {
//    @GetMapping
//    public String getById() {
//        System.out.println("getById is running...");
//        return "springboot";
//    }

    @GetMapping
    public Book getById() {
        System.out.println("getById is running...");
        Book book = new Book();
        book.setId(1);
        book.setName("springboot");
        book.setType("springboot");
        book.setDescription("springboot");
        return book;
    }
}

WebTest.class

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.ResultMatcher;
import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.ContentResultMatchers;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.result.StatusResultMatchers;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@AutoConfigureMockMvc
public class WebTest {
    @Test
    void testWeb(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        mvc.perform(builder);
    }

    @Test
    void testStatus(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        StatusResultMatchers status = MockMvcResultMatchers.status();
        ResultMatcher ok = status.isOk();

        action.andExpect(ok);
    }

    @Test
    void testBody(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.string("springboot");

        action.andExpect(result);
    }

    @Test
    void testJson(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.json("{\"id\":1,\"name\":\"springboot\",\"type\":\"springboot\",\"description\":\"springboot\"}");

        action.andExpect(result);
    }
}

17.匹配响应头

虚拟请求响应头匹配

WebTest.class+ 

package com.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.ResultMatcher;
import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.ContentResultMatchers;
import org.springframework.test.web.servlet.result.HeaderResultMatchers;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.result.StatusResultMatchers;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@AutoConfigureMockMvc
public class WebTest {
    @Test
    void testWeb(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        mvc.perform(builder);
    }

    @Test
    void testStatus(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        StatusResultMatchers status = MockMvcResultMatchers.status();
        ResultMatcher ok = status.isOk();

        action.andExpect(ok);
    }

    @Test
    void testBody(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.string("springboot");

        action.andExpect(result);
    }

    @Test
    void testJson(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.json("{\"id\":1,\"name\":\"springboot\",\"type\":\"springboot\",\"description\":\"springboot\"}");

        action.andExpect(result);
    }

    @Test
    void testContentType(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        HeaderResultMatchers header = MockMvcResultMatchers.header();
        ResultMatcher contentType = header.string("Content-Type", "application/json");
        action.andExpect(contentType);
    }

    @Test
    void testGetById(@Autowired MockMvc mvc) throws Exception {
        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/books");
        ResultActions action = mvc.perform(builder);

        StatusResultMatchers status = MockMvcResultMatchers.status();
        ResultMatcher ok = status.isOk();
        action.andExpect(ok);

        HeaderResultMatchers header = MockMvcResultMatchers.header();
        ResultMatcher contentType = header.string("Content-Type", "application/json");
        action.andExpect(contentType);



        ContentResultMatchers content = MockMvcResultMatchers.content();
        ResultMatcher result = content.json("{\"id\":1,\"name\":\"springboot\",\"type\":\"springboot\",\"description\":\"springboot\"}");
        action.andExpect(result);
    }
}

18.业务层测试事务回滚

为测试用例添加事务，SpringBoot会对测试用例对应的事务提交操作进行回滚

如果想在测试用例中提交事务，可以通过@Rollback注解设置

19.测试用例设置随机数据 

测试用例数据通常采用随机值进行测试，使用SpringBoot提供的随机数为其赋值

  • ${random.int}表示随机整数
  • ${random.int(10)}表示10以内的随机数
  • ${random.int(10,20)}表示10到20的随机数
  • 其中()可以是任意字符，例如[]，!!均可 

20.内置数据源 

现有数据层解决方案技术选型

  • 数据源:DruidDataSource
  • 持久化技术:MyBatis-Plus /MyBatis
  • 数据库:MySQL

格式一

格式二

SpringBoot提供了3种内嵌的数据源对象供开发者选择

  • HikariCP.
  • Tomcat提供DataSource.
  • Commons DBCP

 

通用配置无法设置具体的数据源配置信息，仅提供基本的连接相关配置，如需配置，在下一级配置中设置具体设定

21.JdbcTemplate

现有数据层解决方案技术选型

  • 数据源:DruidDataSource
  • 持久化技术: MyBatls-Plus / MyBatis
  • 数据库:MySQL

内置持久化解决方案——JdbcIemplate

JdbcTemplate配置

 

22.H2数据库

SpringBoot提供了3种内嵌数据库供开发者选择，提高开发测试效率

  • H2
  • HSQL
  • Derby

导入H2相关坐标 

设置当前项目为web工程，并配置H2管理控制台参数

访问用户名sa，默认密码123456 

操作数据库(创建表)

 

 设置访问数据源

H2数据库控制台仅用于开发阶段，线上项目请务必关闭控制台功能 

 

SpringBoot可以根据url地址自动识别数据库种类，在保障驱动类存在的情况下，可以省略配置

 

现有数据层解决方案技术选型 

 

 BookDao.interface

package com.example.springboot_15_sql.dao;


import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.springboot_15_sql.domain.Book;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface BookDao extends BaseMapper<Book> {


}

Book.class 

package com.example.springboot_15_sql.domain;

import lombok.Data;

@Data
public class Book {
    private int id;
    private String name;
    private String type;
    private String description;
}

Sprintboot15SqlApplication.class

package com.example.springboot_15_sql;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Springboot15SqlApplication {

    public static void main(String[] args) {
        SpringApplication.run(Springboot15SqlApplication.class, args);
    }

}

application.yml

#server:
#  port: 8080
#
#spring:
#  datasource:
#    url: jdbc:mysql://localhost:3308/test_db
#    hikari:
#      driver-class-name: com.mysql.cj.jdbc.Driver
#      username: root
#      password: 666666
#      maximum-pool-size: 50

#mybatis-plus:
#  global-config:
#    db-config:
#      table-prefix: tbl_
#      id-type: auto
#  configuration:
#    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

server:
  port: 8080

spring:
  h2:
    console:
      enabled: true
      path: /h2

  datasource:
    url: jdbc:h2:~/test
    hikari:
      driver-class-name: org.h2.Driver
      username: sa
      password: 123456

mybatis-plus:
  global-config:
    db-config:
      table-prefix: tbl_
      id-type: auto
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.17</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.example</groupId>
    <artifactId>springboot_15_sql</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot_15_sql</name>
    <description>springboot_15_sql</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--        <dependency>-->
        <!--            <groupId>com.mysql</groupId>-->
        <!--            <artifactId>mysql-connector-j</artifactId>-->
        <!--            <scope>runtime</scope>-->
        <!--        </dependency>-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--        <dependency>-->
        <!--            <groupId>com.baomidou</groupId>-->
        <!--            <artifactId>mybatis-plus-boot-starter</artifactId>-->
        <!--            <version>3.4.1</version>-->
        <!--        </dependency>-->
        <!--        <dependency>-->
        <!--            <groupId>com.alibaba</groupId>-->
        <!--            <artifactId>druid-spring-boot-starter</artifactId>-->
        <!--            <version>1.2.6</version>-->
        <!--        </dependency>-->

        <!--        <dependency>-->
        <!--            <groupId>org.springframework.boot</groupId>-->
        <!--            <artifactId>spring-boot-starter-jdbc</artifactId>-->
        <!--        </dependency>-->

        <!--        <dependency>-->
        <!--            <groupId>org.springframework.boot</groupId>-->
        <!--            <artifactId>spring-boot-starter-jdbc</artifactId>-->
        <!--        </dependency>-->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <image>
                        <builder>paketobuildpacks/builder-jammy-base:latest</builder>
                    </image>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Sprintboot15SqlApplicationTests.class

package com.example.springboot_15_sql;

import com.example.springboot_15_sql.dao.BookDao;
import com.example.springboot_15_sql.domain.Book;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

@SpringBootTest
class Springboot15SqlApplicationTests {

    @Autowired
    private BookDao bookDao;

    @Test
    void test() {
        bookDao.selectById(1);
    }

    @Test
    void testJdbcTemplate(@Autowired JdbcTemplate jdbcTemplate) {
        String sql = "select * from tbl_book";
//        List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);
//        System.out.println(maps);
        RowMapper<Book> rm = new RowMapper<Book>() {
            @Override
            public Book mapRow(ResultSet rs, int rowNum) throws SQLException {
                Book temp = new Book();
                temp.setId(rs.getInt("id"));
                temp.setName(rs.getString("name"));
                temp.setType(rs.getString("type"));
                temp.setDescription(rs.getString("description"));
                return temp;
            }
        };
        List<Book> list = jdbcTemplate.query(sql, rm);
        System.out.println(list);
    }

//    @Test
//    void testJdbcTemplateSave(@Autowired JdbcTemplate jdbcTemplate) {
//        String sql = "insert into tbl_book values(null,'springboot','springboot','springboot')";
//        jdbcTemplate.update(sql);
//    }

    @Test
    void testJdbcTemplateSave(@Autowired JdbcTemplate jdbcTemplate) {
        String sql = "insert into tbl_book values(3,'springboot3','springboot3','springboot3')";
        jdbcTemplate.update(sql);
    }

}

23.redis下载安装与基本使用

市面上常见的NoSQL解决方案

  • Redis
  • Mongo
  • ES

Redis是一款key-value存储结构的内存级NoSQL数据库

  • 支持多种数据存储格式
  • 支持持久化
  • 支持集群

Redis下载（Windows版）

  • https://github.com/tporadowski/redis/releases

Redis安装与启动( Windows版)

  • Windows解压安装或一键式安装
  • 服务端启动命令

  • 客户端启动命令

 

24.SpringBoot整合Redis

导入SpringBoot整合Redis坐标

配置Redis(采用默认配置)

  • 主机: localhost(默认)
  • 端口:6379(默认)

RedisTemplate提供操作各种数据存储类型的接口API

 

 客户端:RedisTemplate

 

 pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.example</groupId>
    <artifactId>sprintboot_16_redis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sprintboot_16_redis</name>
    <description>sprintboot_16_redis</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <image>
                        <builder>paketobuildpacks/builder-jammy-base:latest</builder>
                    </image>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  redis:
    host: localhost
    port: 6379

Springboot16RedisApplicationTests.class

package com.example.sprintboot_16_redis;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

@SpringBootTest
class Sprintboot16RedisApplicationTests {
    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    void set() {
        ValueOperations ops = redisTemplate.opsForValue();
        ops.set("age", "41");
    }

    @Test
    void get() {
        ValueOperations ops = redisTemplate.opsForValue();
        Object age = ops.get("age");
        System.out.println(age);
    }


    @Test
    void hset() {
        HashOperations ops = redisTemplate.opsForHash();
        ops.put("info", "a", "aa");
    }

    @Test
    void hget() {
        HashOperations ops = redisTemplate.opsForHash();
        Object val = ops.get("info", "a");
        System.out.println(val);
    }

}

25.Springboot读写Redis的客户端

客户端:RedisTemplate以对象作为key和value，内部对数据进行序列化

客户端: StringRedisTemplate以字符串作为key和value，与Redis客户端操作等效 

 

StringRedisTemplateTest.class

package com.example.sprintboot_16_redis;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

@SpringBootTest
public class StringRedisTemplateTest {
    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Test
    void get1() {
        ValueOperations<String, String> ops = stringRedisTemplate.opsForValue();
        String name = ops.get("name");
        System.out.println(name);
    }

    @Test
    void get2() {
        ValueOperations ops = redisTemplate.opsForValue();
        Object name = ops.get("name");
        System.out.println(name);
    }
}

26.Sprintboot操作Redis客户端实现技术切换（jedis）

客户端选择：jedis

配置客户端

配置客户端专用属性

 

lettcus与jedis区别

  • jedis连接Redis服务器是直连模式，当多线程模式下使用jedis会存在线程安全问题，解决方案可以通过配置连接池使每个连接专用，这样整体性能就大受影响。
  • lettcus基于Netty框架进行与Redis服务器连接，底层设计中采用StatefulRedisConnectian。StatefulRedisConnection自身是线程安全的，可以保障并发访问安全问题，所以一个连接可以被多线程复用。当然lettcus也支持多连接实例一起工作.

 


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