spring boot 入门

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一、超喜欢这个，再也不用配置一堆蛋疼的xml了，哇嘎嘎，这个用maven更简单哦，有以下几种方法，1. eclipse安装 springtool插件；2. 下载spring tool suite（解压运行sts-bundle\sts-3.9.0.RELEASE/STS.exe）3. idea的Spring Initializr；

二、pom.xml文件，这些包已经包含了基本的东西，包括数据库连接的

<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>    <groupId>a</groupId>    <artifactId>demo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>demo</name>    <url>http://maven.apache.org</url>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </properties>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.4.3.RELEASE</version>    </parent>    <!-- Add typical dependencies for a web application -->    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>3.8.1</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-thymeleaf</artifactId>        </dependency>    </dependencies>    <!-- Package as an executable jar -->    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

三、试运行，直接找到demo里面的main方法，run

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoApplication {    public static void main(String[] args) {        SpringApplication.run(DemoApplication.class, args);    }}

控制台会输出

 .   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::        (v1.4.3.RELEASE)2017-09-22 14:35:53.188  INFO 6448 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication on EZ-20170302QXAD with PID 6448 (D:\my\test\target\classes started by Administrator in D:\my\test)2017-09-22 14:35:53.191  INFO 6448 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default2017-09-22 14:35:53.593  INFO 6448 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@49ec71f8: startup date [Fri Sep 22 14:35:53 CST 2017]; root of context hierarchy2017-09-22 14:35:54.856  INFO 6448 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$e7a8c8a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)2017-09-22 14:35:55.217  INFO 6448 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2017-09-22 14:35:55.226  INFO 6448 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat2017-09-22 14:35:55.227  INFO 6448 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.62017-09-22 14:35:55.307  INFO 6448 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext2017-09-22 14:35:55.307  INFO 6448 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1719 ms2017-09-22 14:35:55.438  INFO 6448 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]…………

表示运行成功，打开浏览器输入127.0.0.1:8080就会看到有反应，springboot里面内嵌的tomcat默认端口号为8080，稍后介绍怎么修改

四、接下来写第一个程序看看效果吧方法放在/src/main/java下

import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;//注解映射类@RestControllerpublic class test {//映射方法，路径/hello 方法 get    @RequestMapping(value = "hello",method = RequestMethod.GET)    public String name() {        return  "hello word";    }}

重新启动程序浏览器输入http://127.0.0.1:8080/hello，就会看到hello word 字样

五、同样springboot也可以运行web程序

在/src/main/resource/templates下新建index.html
java方法如下

import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;@Controllerpublic class test {    @RequestMapping(value = "hello",method = RequestMethod.GET)    public String name() {        return  "index";    }}

重启项目就可以看到index.html的内容

六、连接数据库

你只要建个库就好了，其他都不用管，超爽
建domian包，Gril 类

package domain;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;//映射到数据库表，字段@Entitypublic class Gril {//主键，自增    @Id    @GeneratedValue    private  Integer id;    private  String cup;    private  Integer age;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public Integer getAge() {        return age;    }    public Gril setAge(Integer age) {        this.age = age;        return this;    }    public String getCup() {        return cup;    }    public Gril setCup(String cup) {        this.cup = cup;        return this;    }//不写会报错    public  Gril(){}}

service/GrilService 数据库事务

package service;import controller.GrilRepository;import domain.Gril;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;@Servicepublic class GrilService {    @Autowired    private GrilRepository grilRepository;    //事务    @Transactional    public  void insertTwo(){        Gril gril1=new Gril();        gril1.setCup("c");        gril1.setAge(11);        grilRepository.save(gril1);        Gril gril2=new Gril();        //数据库吧字段限制成1，不成功都不插入        gril2.setCup("cccc");        gril2.setAge(11);        grilRepository.save(gril2);    }}

controller/GrilController 增删改查事务

package controller;import domain.Gril;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import service.GrilService;import java.util.List;@RestControllerpublic class GrilController {    @Autowired    private GrilRepository grilRepository;    @Autowired    private GrilService grilService;//查询所有列表    @GetMapping(value = "/grils")    public List<Gril> grilList(){        return grilRepository.findAll();    }    //添加    @PostMapping(value = "/grils" )    public  Gril grilAdd(@RequestParam("cup") String cup,                           @RequestParam("age") Integer age){       Gril gril = new Gril();       gril.setAge(age);       gril.setCup(cup);      return grilRepository.save(gril);    }    //查询一个    @GetMapping(value = "/grils/{id}" )    public  Gril grilSellect(@PathVariable("id") Integer id){        return grilRepository.findOne(id);    }    //修改（不知道为什么我这一直有问题，但是慕课教程就正常，写的一毛一样啊）    @PutMapping(value = "/grils/{id}" )    public  Gril grilUp(@PathVariable("id") Integer id,                        @RequestParam("cup") String cup,                        @RequestParam("age") Integer age){        Gril gril=new Gril();        gril.setId(id);        gril.setAge(age);        gril.setCup(cup);        return grilRepository.save(gril);    }//删除   @DeleteMapping (value = "/grils/{id}" )    public  String grilDell(@PathVariable("id") Integer id) {        grilRepository.delete(id);        return  "删除成功";   }//事物    @PostMapping(value = "grils/two")    public String grilTwo(){grilService.insertTwo();return  "事物成功";    }}

controller/GrilRepository 接口

package controller;import domain.Gril;import org.springframework.data.jpa.repository.JpaRepository;public interface GrilRepository extends JpaRepository <Gril,Integer>{}

这样就可以测试了，下面是完整的工程图
这里写图片描述

七、配置文件

自带配置文件是application.properties,不怎么好用，换成了 .yml，这个用着比较爽

spring:#数据库配置  datasource:    driver-class-name: com.mysql.jdbc.Driver    url: jdbc:mysql://127.0.0.1:3306/pro    username: root    password:  jpa:    hibernate:    #更新，还有其他的可以试试      ddl-auto: update      #显示SQL语句    show-sql: true    #服务器设置,太多的请自行百度（反正我也不会，嘎嘎嘎）server:  port: 80  #默认没有。127.0.0.1/hello，加上这个后就是127.0.0.1/spring/hello  display-name: spring

项目已经上传到github,地址为https://github.com/LONG729564606/springboot.git

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