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

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_第1张图片

 

3.代码组织

  1. 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>4.0.0modelVersion>
        <parent>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-parentartifactId>
            <version>2.1.2.RELEASEversion>
            <relativePath/> 
        parent>
        <groupId>com.szsgroupId>
        <artifactId>spring-boot-02-configartifactId>
        <version>0.0.1-SNAPSHOTversion>
        <name>spring-boot-02-configname>
        <description>Demo project for Spring Bootdescription>
    
        <properties>
            <java.version>1.8java.version>
        properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-webartifactId>
            dependency>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-configuration-processorartifactId>
                <optional>trueoptional>
            dependency>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-testartifactId>
                <scope>testscope>
            dependency>
    
        dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.bootgroupId>
                    <artifactId>spring-boot-maven-pluginartifactId>
                plugin>
            plugins>
        build>
    
    project>
    View Code

     

  2. 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 {
        /**
         *  
         *          
         *
         *   
         */
        @Value("${person.last-name}")
        private String lastName;
        @Value("#{11*2}")
        private Integer age;
        @Value("true")
        private Boolean boss;
        private Date birth;
    
        private Map maps;
        private List 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 getMaps() {
            return maps;
        }
    
        public void setMaps(Map maps) {
            this.maps = maps;
        }
    
        public List getLists() {
            return lists;
        }
    
        public void setLists(List lists) {
            this.lists = lists;
        }
    
        public Dog getDog() {
            return dog;
        }
    
        public void setDog(Dog dog) {
            this.dog = dog;
        }
    } 
         
        View Code 
        

     

  3. 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

     

  4. 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;
        }
    }

     

  5. 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);
        }
    
    }

     

  6. 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_第2张图片

     

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