day2021-10-19(Spring boot core configuration file, project deployment, hot deployment, ES6)

Keywords: Java Spring Spring Boot

2. Introduction to spring boot

2.1 configuration file

2.1.1 yml and properties

  • spring boot supports 2 configuration files: *. yaml/*.yml, *. properties
  • Default name of configuration file: application
    • YML format: application.yml
    • properties: application.properties

1) properties configuration

  • Location:% maven%/src/main/resources/

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  • Configuration content: key=value

    • The key content has any value. Generally, the package naming method is adopted. For example: jdbc.driver
#Port number
server.port=9090

#Data source configuration
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc://localhost:3306/ssm_db1
spring.datasource.username=root
spring.datasource.password=1234

2) yml configuration

  • Profile location:

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  • Configuration content: key: value

    #example
A:
 B:
   C:
   	 key: value

    #Port number
server:
  port: 9091

#data source
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc://localhost:3306/ssm_db1
    username: root
    password: 1234

3) yml advanced usage

  • Data types supported by yml

    # Custom data
user:
  username: tom
  age: 12
  birthday: 1997/10/10
  vip: true
  valueList:
    - MyBatis
    - SpringMVC
    - SpringBoot
  ageArray:
    - 18
    - 20
    - 22
  userList:   # Complex writing list < Map > - > [{Name: Tom, age: 20}, {Name: Jack, age: 22}]
    - name: tom
      age: 20
    - name: Jack
      age: 22

2.1.2 configuration content acquisition

  • Two methods are usually used: @ Value, @ ConfigurationProperties
    • @Value: get value one by one. Get value through key. Key is the writing method of the key in the properties file
    • @ConfigurationProperties, determine the prefix and load a group of content at one time.

1) @ Value get a Value

package com.czxy.boot.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author Uncle Tong
 * @email liangtong@itcast.cn
 */
@Configuration
public class OneConfig {

    /**
     * Get the content in the configuration file ${key: default}
     */
    @Value("${server.port:8000}")
    private Integer port;

    /**
     * Print obtained content
     * @return
     */
    @Bean
    public String oneDemo() {
        System.out.println("port Port number:" + port);
        return "";
    }

}

2) @ ConfigurationProperties gets a set of values

package com.czxy.boot.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * @author Uncle Tong
 * @email liangtong@itcast.cn
 */
@Configuration
@ConfigurationProperties(prefix = "user")
public class UserConfig {
    private String username;
    private Integer age;
    private Date birthday;
    private boolean vip;
    private List<String> valueList;
    private String[] ageArray;
    private List<Map<String,String>> userList;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public boolean isVip() {
        return vip;
    }

    public void setVip(boolean vip) {
        this.vip = vip;
    }

    public List<String> getValueList() {
        return valueList;
    }

    public void setValueList(List<String> valueList) {
        this.valueList = valueList;
    }

    public String[] getAgeArray() {
        return ageArray;
    }

    public void setAgeArray(String[] ageArray) {
        this.ageArray = ageArray;
    }

    public List<Map<String, String>> getUserList() {
        return userList;
    }

    public void setUserList(List<Map<String, String>> userList) {
        this.userList = userList;
    }

    @Override
    public String toString() {
        return "UserConfig{" +
                "username='" + username + '\'' +
                ", age=" + age +
                ", birthday='" + birthday + '\'' +
                ", vip=" + vip +
                ", valueList=" + valueList +
                ", ageArray=" + Arrays.toString(ageArray) +
                ", userList=" + userList +
                '}';
    }

    @Bean
    public String userDemo() {
        System.out.println(this);
        return "";
    }

}

2.1.3 profile priority

1) yml and properties priority

  • Properties have priority over yml (properties override the contents of yml)

2) Location priority

  • Configuration files are stored in different locations with different priorities.

    • file:./config /: the config directory of the directory where the project jar package is located

    • file:. /: the same level directory where the project jar package is located

    • classpath:/config: the config directory under the classpath (resource) directory

    • Classpath: /: under the classpath (resource) directory

  • Priority in idea environment

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  • Comparison of complete configuration priorities (priority: 9001 > 9002 > 9003 > 9004)

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2.1.4 multi environment configuration

  • You need to write a configuration file application-{profile}.yml for different environments

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  • Start different configurations

    • Method 1: application.yml file configuration

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      spring:
  profiles:
    active: 10000

    • Method 2: in idea, configure the parameters of the startup class

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    • Method 3: in cmd, configure the parameters of the jar package

      java -jar -Dspring.profiles.active=10000 xxx.jar

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2.2 deployment

2.2.1 project deployment

  • Package the spring boot project into a runnable jar.
  • Just add a plug-in in the pom.xml file and configure the startup class.
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--  Configure startup class  -->
                    <mainClass>com.czxy.boot.HelloApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>

2.2.2 hot deployment

  • Status quo: after the controller is written, it needs to be restarted to take effect.

  • Hot deployment: after modifying some content, it is automatically deployed and can be accessed without restarting.

  • Steps:

    1. Enable auto make automatic compilation (one-time)
    2. Set auto compile project (follow project)
    3. Add dependency

  • Steps:

    1. Enable auto make automatic compilation (one-time)

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    2. Set auto compile project (follow project)

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    3. Add dependency

      <!-- Hot deployment module -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <!-- This needs to be true -->
    <optional>true</optional>
</dependency>

2.3 integration test

  • spring boot integration Junit

  • Steps:

    1. Add dependency
    2. Write test cases

  • realization:

    1. Add dependency

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

    2. Write test cases

      package com.czxy.boot.service;

import com.czxy.boot.HelloApplication;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

/**
 * @author Uncle Tong
 * @email liangtong@itcast.cn
 */
@RunWith(SpringRunner.class)                        // spring integrates Junit
@SpringBootTest(classes = HelloApplication.class)   // spring boot integration Junit
public class TestUserService {

    @Resource
    private UserService userService;

    @Test
    public void testSave() {
        userService.save();
    }
}

3. Unified environment: VS

  • Front end development tool: Visual Studio Code

4. ES 6 (ECMSScript 6)

4.1 what is ES6

  • ECMAScript 6 is a JavaScript specification.

4.2 basic grammar

4.2.1 declaring variables

//1 declare the common variable var
var a = 1;
//2 declare the local variable let
let b = 2;
//3 declare constant const
const c = 3;

4.2.2 template string

  • Status quo: in js, splicing strings is very troublesome.

  • Template string: solve the problem of splicing strings

  • Syntax:

    var t = `content`;

Posted by billynastie on Tue, 19 Oct 2021 11:33:15 -0700

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