Spring Boot-初学01 -使用Spring Initializer快速创建Spring Boot项目 -@RestController+spEL -实现简单SpringBoot的Web页面

1、IDEA：使用 Spring Initializer快速创建项目

IDE都支持使用Spring的项目创建向导快速创建一个Spring Boot项目；

选择我们需要的模块；向导会联网创建Spring Boot项目；

默认生成的Spring Boot项目；

主程序已经生成好了，我们只需要我们自己的逻辑
resources文件夹中目录结构

static：保存所有的静态资源； js css images；
templates：保存所有的模板页面；（Spring Boot默认jar包使用嵌入式的Tomcat，默认不支持JSP页面）；可以使用模板引擎（freemarker、thymeleaf）；
application.properties：Spring Boot应用的配置文件；可以修改一些默认设置；

2.项目结构

3.代码组织

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 http://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>2.1.2.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.szs</groupId>

    <artifactId>spring-boot-02-config</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>spring-boot-02-config</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>org.springframework.boot</groupId>

            <artifactId>spring-boot-configuration-processor</artifactId>

            <optional>true</optional>

        </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>

            </plugin>

        </plugins>

    </build>

</project>

Person javaBean

package com.szs.springboot.bean;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.context.annotation.PropertySource;

import org.springframework.stereotype.Component;

import java.util.Date;

import java.util.List;

import java.util.Map;

/**将配置文件中配置的每一个属性的值,映射到这个组件中;

 * @ConfigurationProperties : 告诉springBoot将本类中的所有属性和

 *          配置文件中相关的配置进行绑定;

 *  prefix = "person": 配置文件中哪个下面的所有属性进行一一映射;

 *

 *  只有这个组件是容器中的组件, 才能使用提供容器的ConfigurationProperties功能;

 */

//@PropertySource(value = {"classpath:person.properties"})

@Component

//@ConfigurationProperties(prefix = "person")

public class Person {

    /**

     *  <bean class=""Person>

     *          <property name="lastName" value="字面量/${key}从环境变量和配置文件中获取值/#{spel表达式}" ></property>

     *

     *   </bean>

     */

    @Value("${person.last-name}")

    private String lastName;

    @Value("#{11*2}")

    private Integer age;

    @Value("true")

    private Boolean boss;

    private Date birth;

    private Map<String,Object> maps;

    private List<Object> lists;

    private Dog dog;

    public Person() {

    }

    @Override

    public String toString() {

        return "Person{" +

                "lastName='" + lastName + '\'' +

                ", age=" + age +

                ", boss=" + boss +

                ", birth=" + birth +

                ", maps=" + maps +

                ", lists=" + lists +

                ", dog=" + dog +

                '}';

    }

    public String getLastName() {

        return lastName;

    }

    public void setLastName(String lastName) {

        this.lastName = lastName;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public Boolean getBoss() {

        return boss;

    }

    public void setBoss(Boolean boss) {

        this.boss = boss;

    }

    public Date getBirth() {

        return birth;

    }

    public void setBirth(Date birth) {

        this.birth = birth;

    }

    public Map<String, Object> getMaps() {

        return maps;

    }

    public void setMaps(Map<String, Object> maps) {

        this.maps = maps;

    }

    public List<Object> getLists() {

        return lists;

    }

    public void setLists(List<Object> lists) {

        this.lists = lists;

    }

    public Dog getDog() {

        return dog;

    }

    public void setDog(Dog dog) {

        this.dog = dog;

    }

}

使用application.properties 这个文件来进行person的初值的赋值!

#server.port=8081

#idea配置的properties文件是utf-8 ,需要进行修改默认properties文件的gbk

person.last-name=阿尔法

person.age=666

person.birth=2017/12/23

person.boss=true

person.dog.name=小花

person.dog.age=1

person.lists=a,b,c

person.maps.k1=v1

person.maps.k2=v222223

HelloController 这个@RestController使用spEL:@Value("#{person.toString()}") 取值,然后设置@RequestMapping("/sayHello")来进行跳转.

package com.szs.springboot.controller;

import org.springframework.beans.factory.annotation.Value;

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

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

@RestController

public class HelloController {

    @Value("#{person.toString()}")

    private String info;

    @RequestMapping("/sayHello")

    public String method1(){

        return "hello "+info;

    }

}

设置@SpringBootApplication 创建Springboot的Main类启动类

package com.szs.springboot;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class SpringBoot02ConfigApplication {

    public static void main(String[] args) {

        SpringApplication.run(SpringBoot02ConfigApplication.class, args);

    }

}

4.运行结果

"C:\Program Files\Java\jdk1.8.0_181\bin\java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=63283 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\IntelliJ IDEA 2018.1\lib\idea_rt.jar=63284:D:\IntelliJ IDEA 2018.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_181\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\rt.jar;D:\DevInstall\WorkSpace_20190111\spring-boot-02-config\target\classes;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-starter-web\2.1.2.RELEASE\spring-boot-starter-web-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-starter\2.1.2.RELEASE\spring-boot-starter-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot\2.1.2.RELEASE\spring-boot-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-autoconfigure\2.1.2.RELEASE\spring-boot-autoconfigure-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-starter-logging\2.1.2.RELEASE\spring-boot-starter-logging-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\DevInstall\RepMaven\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\DevInstall\RepMaven\org\apache\logging\log4j\log4j-to-slf4j\2.11.1\log4j-to-slf4j-2.11.1.jar;D:\DevInstall\RepMaven\org\apache\logging\log4j\log4j-api\2.11.1\log4j-api-2.11.1.jar;D:\DevInstall\RepMaven\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;D:\DevInstall\RepMaven\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;D:\DevInstall\RepMaven\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-starter-json\2.1.2.RELEASE\spring-boot-starter-json-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\core\jackson-databind\2.9.8\jackson-databind-2.9.8.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\core\jackson-core\2.9.8\jackson-core-2.9.8.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.8\jackson-datatype-jdk8-2.9.8.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.8\jackson-datatype-jsr310-2.9.8.jar;D:\DevInstall\RepMaven\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.8\jackson-module-parameter-names-2.9.8.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-starter-tomcat\2.1.2.RELEASE\spring-boot-starter-tomcat-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\apache\tomcat\embed\tomcat-embed-core\9.0.14\tomcat-embed-core-9.0.14.jar;D:\DevInstall\RepMaven\org\apache\tomcat\embed\tomcat-embed-el\9.0.14\tomcat-embed-el-9.0.14.jar;D:\DevInstall\RepMaven\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.14\tomcat-embed-websocket-9.0.14.jar;D:\DevInstall\RepMaven\org\hibernate\validator\hibernate-validator\6.0.14.Final\hibernate-validator-6.0.14.Final.jar;D:\DevInstall\RepMaven\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;D:\DevInstall\RepMaven\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;D:\DevInstall\RepMaven\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;D:\DevInstall\RepMaven\org\springframework\spring-web\5.1.4.RELEASE\spring-web-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-beans\5.1.4.RELEASE\spring-beans-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-webmvc\5.1.4.RELEASE\spring-webmvc-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-aop\5.1.4.RELEASE\spring-aop-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-context\5.1.4.RELEASE\spring-context-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-expression\5.1.4.RELEASE\spring-expression-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\boot\spring-boot-configuration-processor\2.1.2.RELEASE\spring-boot-configuration-processor-2.1.2.RELEASE.jar;D:\DevInstall\RepMaven\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;D:\DevInstall\RepMaven\org\springframework\spring-core\5.1.4.RELEASE\spring-core-5.1.4.RELEASE.jar;D:\DevInstall\RepMaven\org\springframework\spring-jcl\5.1.4.RELEASE\spring-jcl-5.1.4.RELEASE.jar" com.szs.springboot.SpringBoot02ConfigApplication

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.1.2.RELEASE)

2019-01-22 14:03:53.740  INFO 8588 --- [           main] c.s.s.SpringBoot02ConfigApplication      : Starting SpringBoot02ConfigApplication on DESKTOP-IHFHKDB with PID 8588 (D:\DevInstall\WorkSpace_20190111\spring-boot-02-config\target\classes started by dell in D:\DevInstall\WorkSpace_20190111\spring-boot-02-config)

2019-01-22 14:03:53.742  INFO 8588 --- [           main] c.s.s.SpringBoot02ConfigApplication      : No active profile set, falling back to default profiles: default

2019-01-22 14:03:54.402  INFO 8588 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)

2019-01-22 14:03:54.415  INFO 8588 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]

2019-01-22 14:03:54.415  INFO 8588 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.14]

2019-01-22 14:03:54.419  INFO 8588 --- [           main] o.a.catalina.core.AprLifecycleListener   : An older version [1.2.18] of the APR based Apache Tomcat Native library is installed, while Tomcat recommends a minimum version of [1.2.19]

2019-01-22 14:03:54.419  INFO 8588 --- [           main] o.a.catalina.core.AprLifecycleListener   : Loaded APR based Apache Tomcat Native library [1.2.18] using APR version [1.6.5].

2019-01-22 14:03:54.420  INFO 8588 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].

2019-01-22 14:03:54.420  INFO 8588 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]

2019-01-22 14:03:54.422  INFO 8588 --- [           main] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.1  11 Sep 2018]

2019-01-22 14:03:54.493  INFO 8588 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

2019-01-22 14:03:54.493  INFO 8588 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 719 ms

2019-01-22 14:03:54.638  INFO 8588 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'

2019-01-22 14:03:54.768  INFO 8588 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''

2019-01-22 14:03:54.770  INFO 8588 --- [           main] c.s.s.SpringBoot02ConfigApplication      : Started SpringBoot02ConfigApplication in 1.305 seconds (JVM running for 1.931)

2019-01-22 14:04:02.740  INFO 8588 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'

2019-01-22 14:04:02.740  INFO 8588 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'

2019-01-22 14:04:02.743  INFO 8588 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 3 ms

Spring Boot-初学01 -使用Spring Initializer快速创建Spring Boot项目 -@RestController+spEL -实现简单SpringBoot的Web页面