认识SpingBoot

Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化Spring应用的初始搭建以及开发过程。 -使用springboot以后,搭建一个spring应用和开发变得很简单.

Spring Boot并不是一个框架，从根本上将，它就是一些maven库的集合，maven或者gradle项目导入相应依赖即可使用Spring Boot，而且无需自行管理这些库的版本。

Springboot就是一些写好了maven的模块，我们在使用SPring就不需以传统的方式来用，只需要以maven导入对应的springboot模块，就能完成一大堆操作。简单的说，它使用maven的方式对Spring应用开发进行进一步封装和简化。

简单而言，即Spring Boot使编码更简单，使配置更简单，使部署更简单，使监控更简单。！

Springboot就是为了简化spring应用搭建，开发，部署，监控的开发工具。

Spring boot入门

创建maven项目

导入Spring Boot依赖

spring boot 父节点依赖,引入这个之后相关的引入就不需要添加version配置，spring boot会自动选择最合适的版本进行添加（在最外层的pom.xml中添加即可）。

     <parent>

         <groupId>org.springframework.boot</groupId>

         <artifactId>spring-boot-starter-parent</artifactId>

         <version>2.0.5.RELEASE</version>

     </parent>

     <dependencyManagement>

         <dependencies>

             <!--springboot版本管理-->

             <dependency>

                 <groupId>org.springframework.boot</groupId>

                 <artifactId>spring-boot-dependencies</artifactId>

                 <version>2.0.5.RELEASE</version>

                 <type>pom</type>

                 <scope>import</scope>

             </dependency>

         </dependencies>

     </dependencyManagement>

spingBoot对于web的支持

  <dependencies>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-web</artifactId>

         </dependency>

         <!-- 热部署-->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-devtools</artifactId>

             <optional>true</optional>

             <scope>true</scope>

         </dependency>

     </dependencies>

     <build>

         <plugins>

             <plugin>

                 <groupId>org.springframework.boot</groupId>

                 <artifactId>spring-boot-maven-plugin</artifactId>

                 <configuration>

                     <!--fork :  如果没有该项配置，可能devtools不会起作用，即应用不会restart -->

                     <fork>true</fork>

                 </configuration>

             </plugin>

         </plugins>

     </build>

 </project>

SpringBoot做jsp跳转依赖包

     <dependencies>

         <dependency>

             <groupId>junit</groupId>

             <artifactId>junit</artifactId>

             <version>4.11</version>

             <scope>test</scope>

         </dependency>

         <!-- web支持: 1、web mvc; 2、restful; 3、jackjson支持; 4、aop ........ -->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-web</artifactId>

         </dependency>

         <!-- servlet 依赖. -->

         <dependency>

             <groupId>javax.servlet</groupId>

             <artifactId>javax.servlet-api</artifactId>

         </dependency>

         <dependency>

             <groupId>javax.servlet</groupId>

             <artifactId>jstl</artifactId>

         </dependency>

         <!-- tomcat 的支持. -->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-tomcat</artifactId>

         </dependency>

         <dependency>

             <groupId>org.apache.tomcat.embed</groupId>

             <artifactId>tomcat-embed-jasper</artifactId>

         </dependency>

     </dependencies>

     <build>

         <finalName>springboot_jsp</finalName>

         <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

             <plugins>

                 <plugin>

                     <artifactId>maven-clean-plugin</artifactId>

                     <version>3.1.0</version>

                 </plugin>

                 <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

                 <plugin>

                     <artifactId>maven-resources-plugin</artifactId>

                     <version>3.0.2</version>

                 </plugin>

                 <plugin>

                     <artifactId>maven-compiler-plugin</artifactId>

                     <version>3.8.0</version>

                 </plugin>

                 <plugin>

                     <artifactId>maven-surefire-plugin</artifactId>

                     <version>2.22.1</version>

                 </plugin>

                 <plugin>

                     <artifactId>maven-war-plugin</artifactId>

                     <version>3.2.2</version>

                 </plugin>

                 <plugin>

                     <artifactId>maven-install-plugin</artifactId>

                     <version>2.5.2</version>

                 </plugin>

                 <plugin>

                     <artifactId>maven-deploy-plugin</artifactId>

                     <version>2.8.2</version>

                 </plugin>

             </plugins>

         </pluginManagement>

     </build>

 </project>
    配置application.properties对jsp支持

添加src/main/resources/application.properties：

# 页面默认前缀目录

spring.mvc.view.prefix=/WEB-INF/jsp/

# 响应页面默认后缀

spring.mvc.view.suffix=.jsp

# 自定义属性，可以在Controller中读取

application.hello=Hello Angel From application
测试
@Controller

public class TestController {

    @RequestMapping("/index")

    public  String index(){

        return "index";

    }

}

SpingBoot对Freemark的静态化支持

 <dependencies>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.11</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- 对freemark的支持-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-freemarker</artifactId>

        </dependency>

    </dependencies>

 <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <source>1.8</source>

                    <target>1.8</target>

                    <encoding>utf-8</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <mainClass>cn.newsoft.FreemaekApp</mainClass> <!--主类 包含main-->

                    <layout>JAR</layout>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

然后准备一个静态模板

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml"xmlns:th="http://www.thymeleaf.org"

      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">

<head>

    <title>Hello World!</title>

</head>

<body>

<h1>Hello , ${msg}</h1>

</body>

</html>

配置application.properties

# FreeeMarker 模板引擎配置

#       设定ftl文件路径

spring.freemarker.tempalte-loader-path=classpath:/templates

#        关闭缓存，及时刷新，上线生产环境需要修改为true

spring.freemarker.cache=false

spring.freemarker.charset=UTF-8

spring.freemarker.check-template-location=true

spring.freemarker.content-type=text/html

spring.freemarker.expose-request-attributes=true

spring.freemarker.expose-session-attributes=true

spring.freemarker.request-context-attribute=request

spring.freemarker.suffix=.ftl

spingBoot对于spingJdbc的支持

配置文件

<dependencies>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.11</version>

            <scope>test</scope>

        </dependency>

            <!--引入Maven依赖-mysql，jdbc-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

        </dependency>

    </dependencies>

    <build>

        <finalName>spingboot_jdbc</finalName>

        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

            <plugins>

                <plugin>

                    <artifactId>maven-clean-plugin</artifactId>

                    <version>3.1.0</version>

                </plugin>

                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

                <plugin>

                    <artifactId>maven-resources-plugin</artifactId>

                    <version>3.0.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-compiler-plugin</artifactId>

                    <version>3.8.0</version>

                </plugin>

                <plugin>

                    <artifactId>maven-surefire-plugin</artifactId>

                    <version>2.22.1</version>

                </plugin>

                <plugin>

                    <artifactId>maven-war-plugin</artifactId>

                    <version>3.2.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-install-plugin</artifactId>

                    <version>2.5.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-deploy-plugin</artifactId>

                    <version>2.8.2</version>

                </plugin>

            </plugins>

        </pluginManagement>

    </build>

</project>

准备一个application.properties

 spring.datasource.url = jdbc:mysql://localhost:3306/shop

 spring.datasource.username = root

 spring.datasource.password = admin

 spring.datasource.driverClassName = com.mysql.jdbc.Driver

 spring.datasource.max-active=20

 spring.datasource.max-idle=8

 spring.datasource.min-idle=8

 spring.datasource.initial-size=10

然后建立dao层 service层都是一样的创建

创建一个启动类

package cn.newsoft;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class JdbcApp {

    public static void main(String[] args) {

        SpringApplication.run(JdbcApp.class);

    }

}

最后完成测试

 package cn.newsoft;

 import cn.newsoft.domain.Employee;

 import cn.newsoft.service.IEmployeeService;

 import org.junit.Test;

 import org.junit.runner.RunWith;

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

 import org.springframework.boot.test.context.SpringBootTest;

 import org.springframework.test.context.junit4.SpringRunner;

 @RunWith(SpringRunner.class)

 @SpringBootTest(classes = JdbcApp.class)//这个class是启动类的

 public class EmployeeTest {

     @Autowired

     private IEmployeeService employeeService;

     @Test

         public void test() throws Exception{

         Employee employee = new Employee();

         employee.setName("zhsnag ");

         employeeService.save(employee);

     }

 }

SpringBoot对于Mybatis的支持

配置文件

dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.12</version>

        </dependency>

        <!-- mysql 数据库驱动. -->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <!--

                    spring-boot mybatis依赖：

                 -->

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.1.1</version>

        </dependency>

        <!--

            MyBatis提供了拦截器接口，我们可以实现自己的拦截器，

            将其作为一个plugin装入到SqlSessionFactory中。

                Github项目地址： https://github.com/pagehelper/Mybatis-PageHelper

             -->

        <dependency>

            <groupId>com.github.pagehelper</groupId>

            <artifactId>pagehelper</artifactId>

            <version>4.1.0</version>

        </dependency>

    </dependencies>

    <build>

        <finalName>springboot_mybatis</finalName>

        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

            <plugins>

                <plugin>

                    <artifactId>maven-clean-plugin</artifactId>

                    <version>3.1.0</version>

                </plugin>

                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

                <plugin>

                    <artifactId>maven-resources-plugin</artifactId>

                    <version>3.0.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-compiler-plugin</artifactId>

                    <version>3.8.0</version>

                </plugin>

                <plugin>

                    <artifactId>maven-surefire-plugin</artifactId>

                    <version>2.22.1</version>

                </plugin>

                <plugin>

                    <artifactId>maven-war-plugin</artifactId>

                    <version>3.2.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-install-plugin</artifactId>

                    <version>2.5.2</version>

                </plugin>

                <plugin>

                    <artifactId>maven-deploy-plugin</artifactId>

                    <version>2.8.2</version>

                </plugin>

            </plugins>

        </pluginManagement>

    </build>

</project>

配置application.properties

spring.datasource.url = jdbc:mysql://localhost:3306/shop

spring.datasource.username = root

spring.datasource.password = admin

spring.datasource.driverClassName = com.mysql.jdbc.Driver

spring.datasource.max-active=20

spring.datasource.max-idle=8

spring.datasource.min-idle=8

spring.datasource.initial-size=10

mybatis.type-aliases-package=cn.newsoft.domain//别名

准备一个mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="cn.newsoft.mapper.UserMapper">

    <!--void save(User user);-->

    <insert id="saveone" parameterType="User" useGeneratedKeys="true" keyProperty="id" keyColumn="id">

        insert into t_user(name) values(#{name})

    </insert>

    <select id="queryAll" resultType="User">

        select * from t_user

    </select>

</mapper>

然后mapper层操作和mybatis一样的

sevice层

package cn.newsoft.service.impl;

import cn.newsoft.domain.User;

import cn.newsoft.mapper.UserMapper;

import cn.newsoft.service.IUserService;

import com.github.pagehelper.PageHelper;

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

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service

@Transactional

public class IUserServiceImpl implements IUserService {

    @Autowired

    private UserMapper userMapper;

    @Override

    public void save(User user) {

        userMapper.save(user);

    }

    @Override

    public void saveone(User user) {

        userMapper.saveone(user);

    }

    @Override

    public List<User> queryAll() {//分页

        PageHelper.startPage(1, 2);

        List<User> users = userMapper.queryAll();

        return users;

    }

}

然后准备启动类

package cn.newsoft;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

@MapperScan(value = "cn.newsoft.mapper")

public class MybatisApp {

    public static void main(String[] args) {

        SpringApplication.run(MybatisApp.class);

    }

}

最后完成测试

package cn.newsoft;

import cn.newsoft.domain.User;

import cn.newsoft.service.IUserService;

import org.junit.Test;

import org.junit.runner.RunWith;

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

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)

@SpringBootTest(classes = MybatisApp.class)

public class MybatisTest {

    @Autowired

    private IUserService userService;

    @Test

        public void test() throws Exception{

        User user = new User();

        user.setName("hhh ");

        userService.save(user);

    }

    @Test

        public void tes1t() throws Exception{

        User user = new User();

        user.setName("hh");

        userService.saveone(user);

    }

    @Test

        public void test2() throws Exception{

        List<User> users = userService.queryAll();

        for (User user : users) {

            System.out.println(user);

        }

    }

}

注意在分页时需要写一个分页类，专门用来分页

package cn.newsoft.config;

import com.github.pagehelper.PageHelper;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.test.context.ContextConfiguration;

import java.util.Properties;

@Configuration

public class MyBatisConfiguration {

    @Bean

    public PageHelper pageHelper(){

        PageHelper pageHelper = new PageHelper();

        Properties p = new Properties();

        //配置分页的参数设置

        //和startPage中的pageNum效果一样

        p.setProperty("offsetAsPageNum", "true");

        //设置为true时，使用RowBounds分页会进行count查询

        p.setProperty("rowBoundsWithCount", "true");

        // 启用合理化时，如果pageNum<1会查询第一页，如果pageNum>pages会查询最后一页

        p.setProperty("reasonable", "true");

        pageHelper.setProperties(p);

        return pageHelper;

    }

}

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