SpringBoot创建项目入门案例

╰+哭是因爲堅強的太久メ 2023-02-13 08:08 5阅读 0赞

# 目录结构 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]

# 一、创建SpringBoot项目 #

## 1.创建骨架名称 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 1]

## 2.给项目命名 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 2]

## 3.配置pom.xml文件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 4]

## 4.MySql的驱动包 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 5]

## 5.自动生成的pom.xml文件 ##

<?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>2.3.0.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.william</groupId>
        <artifactId>keepmoving</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>keepmoving</name>
        <description>Demo project for Spring Boot</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>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

# 二、写入demo #

package com.william.keepmoving.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2020/5/27  22:42
     * @description ：
     * @version: 1.0
     */
    @RestController
    public class HoldOnLife {
        @RequestMapping("/hello")
        public String hello(){
            return "hello";
    
        }
    
    
    }

# 三、启动项目 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 6]

发起请求  
http://localhost:8080/hello

响应的页面  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 7]

# 四、Spring的自动配置 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 8]

# 五、yml文件的使用 #

## 特殊的单词出现的问题 ##

![在这里插入图片描述][20200528225734310.png]  
home 会输出本地的home  
country 会输出国家的英文简称

## yml的两种注入方式 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 9]

### 1.实体类注入 ###

#### 创建实体类 ####

1.加入注解  
@Component  
@ConfigurationProperties(prefix = “user”)  
2.加入以上两个注解时需要在pom.xml文件中加入配置处理器依赖  
不加配置处理器依赖会提示  
![在这里插入图片描述][20200528230848784.png]

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-configuration-processor</artifactId>
                <optional>true</optional>
            </dependency>

3.user要和yml文件中的user相同，user实体类要加入对应的get(),set()方法  
4.点击实体类中的图标会跳转到yml文件对应的字段  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 10]

package com.william.keepmoving.domain;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    import java.util.Arrays;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2020/5/28  22:26
     * @description ：
     * @version: 1.0
     */
    @Component
    @ConfigurationProperties(prefix = "user")
    public class User {
        private String city;
        private String country;
        private String[] home;
        private String time;
        private String ip;
        private String password;
        private String test;
    
        @Override
        public String toString() {
            return "User{" +
                    "city='" + city + '\'' +
                    ", country='" + country + '\'' +
                    ", home=" + Arrays.toString(home) +
                    ", time='" + time + '\'' +
                    ", ip='" + ip + '\'' +
                    ", password='" + password + '\'' +
                    ", test='" + test + '\'' +
                    '}';
        }
    
        public String getCity() {
            return city;
        }
    
        public void setCity(String city) {
            this.city = city;
        }
    
        public String getCountry() {
            return country;
        }
    
        public void setCountry(String country) {
            this.country = country;
        }
    
        public String[] getHome() {
            return home;
        }
    
        public void setHome(String[] home) {
            this.home = home;
        }
    
        public String getTime() {
            return time;
        }
    
        public void setTime(String time) {
            this.time = time;
        }
    
        public String getIp() {
            return ip;
        }
    
        public void setIp(String ip) {
            this.ip = ip;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
        public String getTest() {
            return test;
        }
    
        public void setTest(String test) {
            this.test = test;
        }
    }

在yml文件中加入特定值  
![在这里插入图片描述][20200528231119735.png]  
测试类需要注入  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 11]

### 2.注解注入 ###

在yml文件中配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 12]  
只需要在测试类中加入注解@value配置就可以了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 13]

# 六、数组 #

## yml文件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 14]

## 实体类 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 15]

package com.william.keepmoving.domain;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    import java.util.Arrays;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2020/5/28  22:26
     * @description ：
     * @version: 1.0
     */
    @Component
    @ConfigurationProperties(prefix = "user")
    public class User {
        private String city;
        private String country;
        private String[] home1;
        private String time;
        private String ip;
        private String password;
        private String test;
    
        @Override
        public String toString() {
            return "User{" +
                    "city='" + city + '\'' +
                    ", country='" + country + '\'' +
                    ", home1=" + Arrays.toString(home1) +
                    ", time='" + time + '\'' +
                    ", ip='" + ip + '\'' +
                    ", password='" + password + '\'' +
                    ", test='" + test + '\'' +
                    '}';
        }
    
        public String getCity() {
            return city;
        }
    
        public void setCity(String city) {
            this.city = city;
        }
    
        public String getCountry() {
            return country;
        }
    
        public void setCountry(String country) {
            this.country = country;
        }
    
        public String[] getHome1() {
            return home1;
        }
    
        public void setHome1(String[] home1) {
            this.home1 = home1;
        }
    
        public String getTime() {
            return time;
        }
    
        public void setTime(String time) {
            this.time = time;
        }
    
        public String getIp() {
            return ip;
        }
    
        public void setIp(String ip) {
            this.ip = ip;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
        public String getTest() {
            return test;
        }
    
        public void setTest(String test) {
            this.test = test;
        }
    }

# 执行后的效果 #

![在这里插入图片描述][20200528232310788.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200527230655980.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz,size_16,color_FFFFFF,t_70
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[20200528225734310.png]: https://img-blog.csdnimg.cn/20200528225734310.png
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[20200528230848784.png]: https://img-blog.csdnimg.cn/20200528230848784.png
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[20200528232310788.png]: https://img-blog.csdnimg.cn/20200528232310788.png