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创建SpringBoot的Demo
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‎SimplestSpringBootDemo/README.md

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## 最简JAVA程序之最简SpringBoot
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### 1.运行前说明:
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本项目使用maven进行搭建，如果您的IDE中集成了maven，请直接导入maven项目;
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### 2.最简SpringBoot程序的搭建步骤:
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1. 最为关键的是使用maven来构建程序.创建pom.xml文件,引入相应的starter模块,即可将spring相关的jar包引进来,具体到
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本项目:
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1. 定义parent,这个会限定spring的版本:
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2. 引入相应的模块,在本项目中包括:
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| 模块 | 作用 |
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|------------|-------------|
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|spring-boot-starter-web|引入web相关的springboot模块|
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|spring-boot-starter-jdbc|引入数据库访问的springboot模块|
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3. 引入其他的相关技术:包括thymeleaf(用来构建前台页面)和h2Database(用来创建一个运行在内存中的数据库)
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2. 按照模块的**约定**创建主体的程序:
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- Controller:使用@Controller注解标注,使用@RequestMapping映射访问路径(和SpringMVC的用法一致)
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- Repository:对本项目来说,使用jdbc,只需要在相应类中注入JDBCTemplate,使用JDBCTemplate执行sql语句即可.
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- 前台页面相关:Controller返回的string会默认配置在templates目录下,所以将相应的html文件放到这个目录下,
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springBoot将自动去这个目录下寻找资源;
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- 静态资源:默认在static等目录下,所以放在这几个目录下即可.
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3. Application的创建:
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启动SpringBoot需要创建一个带main方法的类启动,并且需要@ComponentScan和@EnableAutoConfiguration开启自动配置,
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然后SpringBoot将会自动所有包中的文件,启动.
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```
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package chentao.project;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
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import org.springframework.context.annotation.ComponentScan;
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@ComponentScan
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@EnableAutoConfiguration
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public class Application {
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public static void main(String [] args){
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SpringApplication.run(Application.class,args);
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}
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}
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```
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### 3 更多说明:
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1. SpringBoot使用约定的方式进行项目的管理,会根据项目中引入的模块自动的开启相关的配置,比如说引入了Jdbc模块,就会根据项目中属性配置
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去自动创建Connection,JDBCTemplate的相应的依赖,或者进行注册,简化了XML的配置.
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2. SpringBoot中集成了Tomcat模块,所以启动SpringBoot很简单,不需要额外通过IDE配置.

‎SimplestSpringBootDemo/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>chentao.project</groupId>
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<artifactId>SpringBoot</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<repositories>
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<!-- for spring milestone -->
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<repository>
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<id>spring.milestone</id>
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<url>http://repo.spring.io/milestone</url>
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</repository>
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</repositories>
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<pluginRepositories>
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<!-- for spring milestone -->
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<pluginRepository>
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<id>spring.milestone</id>
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<url>http://repo.spring.io/milestone</url>
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</pluginRepository>
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</pluginRepositories>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.1.4.RELEASE</version>
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.thymeleaf</groupId>
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<artifactId>thymeleaf-spring4</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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</dependency>
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</dependencies>
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</project>

‎SimplestSpringBootDemo/src/main/java/chentao/project/Application.java

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package chentao.project;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
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import org.springframework.context.annotation.ComponentScan;
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@ComponentScan
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@EnableAutoConfiguration
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public class Application {
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public static void main(String [] args){
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SpringApplication.run(Application.class,args);
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}
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}

‎SimplestSpringBootDemo/src/main/java/chentao/project/Contact.java

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package chentao.project;
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public class Contact {
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private Long id;
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private String firstName;
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private String lastName;
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private String phoneNumber;
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private String emailAddress;
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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public String getPhoneNumber() {
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return phoneNumber;
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}
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public void setPhoneNumber(String phoneNumber) {
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this.phoneNumber = phoneNumber;
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}
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public String getEmailAddress() {
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return emailAddress;
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}
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public void setEmailAddress(String emailAddress) {
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this.emailAddress = emailAddress;
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}
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}

‎SimplestSpringBootDemo/src/main/java/chentao/project/ContactController.java

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package chentao.project;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import java.util.List;
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import java.util.Map;
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@Controller
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@RequestMapping("/")
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public class ContactController {
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private ContactRepository contactRepo;
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@Autowired
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public ContactController(ContactRepository contactRepo){
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this.contactRepo = contactRepo;
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}
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@RequestMapping(method = RequestMethod.GET)
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public String home(Map<String,Object> model){
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List<Contact> contacts = contactRepo.findAll();
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model.put("contacts",contacts);
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return "home";
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}
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@RequestMapping(method = RequestMethod.POST)
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public String submit(Contact contact){
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contactRepo.save(contact);
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return "redirect:/";
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}
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}

‎SimplestSpringBootDemo/src/main/java/chentao/project/ContactRepository.java

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package chentao.project;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.jdbc.core.JdbcTemplate;
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import org.springframework.jdbc.core.RowMapper;
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import org.springframework.stereotype.Repository;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.List;
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@Repository
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public class ContactRepository {
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@Autowired
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private JdbcTemplate jdbc;
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public List<Contact> findAll(){
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return jdbc.query(
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"select id,firstName,lastName,phoneNumber,emailAddress " +
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"from contacts order by lastName",
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new RowMapper<Contact>() {
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@Override
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public Contact mapRow(ResultSet rs, int i) throws SQLException {
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Contact contact = new Contact();
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contact.setId(rs.getLong(1));
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contact.setFirstName(rs.getString(2));
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contact.setLastName(rs.getString(3));
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contact.setPhoneNumber(rs.getString(4));
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contact.setEmailAddress(rs.getString(5));
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return contact;
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}
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}
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);
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}
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public void save(Contact contact){
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jdbc.update(
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"insert into contacts "+"(firstName,lastName ,phoneNumber, emailAddress)"
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+ "values (?,?,?,?)",
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contact.getFirstName(),contact.getLastName(),
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contact.getPhoneNumber(),contact.getEmailAddress()
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);
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}
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}

‎SimplestSpringBootDemo/src/main/resources/schema.sql

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create table contacts(
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id IDENTITY,
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firstName VARCHAR (30) not null,
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lastName VARCHAR (50) not null,
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phoneNumber VARCHAR (13),
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emailAddress varchar(30)
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);

‎SimplestSpringBootDemo/src/main/resources/static/style.css

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body{
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background-color: #eeeeee;
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font-family:sans-serif;
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}
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label {
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display:inline-block;
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width: 120px;
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text-align: right;
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}

‎SimplestSpringBootDemo/src/main/resources/templates/home.html

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<!DOCTYPE html>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<title>Spring Boot Contacts</title>
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<link rel="stylesheet" th:href="@{/style.css}"/>
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</head>
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<body>
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<h2>Spring Boot Contacts</h2>
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<form method="POST">
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<label for="firstName">First Name:</label>
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<input type="text" name="firstName" id="firstName"/><br/>
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<label for="lastName">Last Name:</label>
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<input type="text" name="lastName" id="lastName"/><br/>
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<label for="phoneNumber">Phone #:</label>
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<input type="text" name="phoneNumber" id="phoneNumber"/><br/>
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<label for="emailAddress">Email:</label>
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<input type="text" name="phoneNumber" id="emailAddress"/><br/>
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<input type="submit"/>
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</form>
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<ul th:each="contact : ${contacts}">
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<li>
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<span th:text = "${contact.firstName}">First</span>
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<span th:text="${contact.lastName}">Last</span>
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<span th:text="${contact.phoneNumber}">PhoneNumber</span>
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<span th:text="${contact.emailAddress}">emailAddress</span>
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</li>
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</ul>
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</body>
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</html>

‎SimplestSpringBootDemo/target/classes/schema.sql

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create table contacts(
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id IDENTITY,
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firstName VARCHAR (30) not null,
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lastName VARCHAR (50) not null,
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phoneNumber VARCHAR (13),
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emailAddress varchar(30)
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);

‎SimplestSpringBootDemo/target/classes/static/style.css

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body{
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background-color: #eeeeee;
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font-family:sans-serif;
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}
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label {
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display:inline-block;
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width: 120px;
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text-align: right;
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}

‎SimplestSpringBootDemo/target/classes/templates/home.html

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<!DOCTYPE html>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<title>Spring Boot Contacts</title>
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<link rel="stylesheet" th:href="@{/style.css}"/>
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</head>
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<body>
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<h2>Spring Boot Contacts</h2>
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<form method="POST">
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<label for="firstName">First Name:</label>
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<input type="text" name="firstName" id="firstName"/><br/>
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<label for="lastName">Last Name:</label>
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<input type="text" name="lastName" id="lastName"/><br/>
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<label for="phoneNumber">Phone #:</label>
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<input type="text" name="phoneNumber" id="phoneNumber"/><br/>
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<label for="emailAddress">Email:</label>
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<input type="text" name="phoneNumber" id="emailAddress"/><br/>
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<input type="submit"/>
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</form>
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<ul th:each="contact : ${contacts}">
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<li>
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<span th:text = "${contact.firstName}">First</span>
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<span th:text="${contact.lastName}">Last</span>
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<span th:text="${contact.phoneNumber}">PhoneNumber</span>
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<span th:text="${contact.emailAddress}">emailAddress</span>
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</li>
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</ul>
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</body>
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</html>

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