Spring Boot入门
最近在公司太清闲了，为了打发我过剩的精力，我逛起了微信上关注的几个关于java技术的公众号，有一篇文章上《Java工程师技能表》，上边的技能排名挺有意思的：
其他技能即使在公司项目中没用过，但是咱最少自学过，有点了解。但是Spring Boot竟然排名这么高，那我今天就来入入门。
什么是Spring Boot？特点是什么？
Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置，从而使开发人员不再需要定义样板化的配置。通过这种方式，Spring Boot致力于在蓬勃发展的快速应用开发领域（rapid application development）成为领导者。
特点：
1. 创建独立的Spring应用程序
2. 嵌入的Tomcat，无需部署WAR文件
3. 简化Maven配置
4. 自动配置Spring
5. 提供生产就绪型功能，如指标，健康检查和外部配置
6. 绝对没有代码生成和对XML没有要求配置
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Spring Boot配置简单、功能齐全，如果我们只需要开发一个功能简单的程序，就可以使用Spring Boot，省去繁琐的框架整合时间。
下面就开始进行一个Spring Boot demo的创建吧！
第一步：下载压缩包，导入项目。
下载地址： http://start.spring.io/
下载获得： demo.zip 解压缩并导入到项目中。
第二步：编写相关代码。
1.pom.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 6 <groupId>com.example</groupId> 7 <artifactId>demo</artifactId> 8 <version>0.0.1-SNAPSHOT</version> 9 <packaging>jar</packaging> 10 11 <name>demo</name> 12 <description>Demo project for Spring Boot</description> 13 14 <parent> 15 <groupId>org.springframework.boot</groupId> 16 <artifactId>spring-boot-starter-parent</artifactId> 17 <version>1.5.2.RELEASE</version> 18 <relativePath /> <!-- lookup parent from repository --> 19 </parent> 20 21 <properties> 22 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 23 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 24 <java.version>1.8</java.version> 25 </properties> 26 27 <dependencies> 28 <dependency> 29 <groupId>org.springframework.boot</groupId> 30 <artifactId>spring-boot-starter</artifactId> 31 </dependency> 32 33 <dependency> 34 <groupId>org.springframework.boot</groupId> 35 <artifactId>spring-boot-starter-test</artifactId> 36 <scope>test</scope> 37 </dependency> 38 39 40 <dependency> 41 <groupId>org.springframework.boot</groupId> 42 <artifactId>spring-boot-starter-web</artifactId> 43 </dependency> 44 45 <!-- mybatis --> 46 <dependency> 47 <groupId>org.mybatis.spring.boot</groupId> 48 <artifactId>mybatis-spring-boot-starter</artifactId> 49 <version>1.1.1</version> 50 </dependency> 51 <dependency> 52 <groupId>mysql</groupId> 53 <artifactId>mysql-connector-java</artifactId> 54 </dependency> 55 <dependency> 56 <groupId>org.springframework.boot</groupId> 57 <artifactId>spring-boot-devtools</artifactId> 58 <optional>true</optional> 59 </dependency> 60 </dependencies> 61 62 <build> 63 <plugins> 64 <plugin> 65 <groupId>org.springframework.boot</groupId> 66 <artifactId>spring-boot-maven-plugin</artifactId> 67 </plugin> 68 </plugins> 69 </build> 70 71 72 </project>
2.application.properties
1 mybatis.type-aliases-package=com.example.myproject.entity 2 3 spring.datasource.driverClassName = com.mysql.jdbc.Driver 4 spring.datasource.url = jdbc:mysql://localhost:3306/tao?useUnicode=true&characterEncoding=utf-8 5 spring.datasource.username = root 6 spring.datasource.password = 123
3.实体类
1 package com.example.myproject.entity; 2 3 import java.io.Serializable; 4 5 public class User implements Serializable { 6 private String username; 7 private String password; 8 private String name; 9 private String email; 10 public String getUsername() { 11 return username; 12 } 13 public void setUsername(String username) { 14 this.username = username; 15 } 16 public String getPassword() { 17 return password; 18 } 19 public void setPassword(String password) { 20 this.password = password; 21 } 22 public String getName() { 23 return name; 24 } 25 public void setName(String name) { 26 this.name = name; 27 } 28 public String getEmail() { 29 return email; 30 } 31 public void setEmail(String email) { 32 this.email = email; 33 } 34 35 }
4.DAO层代码
1 package com.example.myproject.dao; 2 3 import java.util.List; 4 5 import org.apache.ibatis.annotations.Delete; 6 import org.apache.ibatis.annotations.Insert; 7 import org.apache.ibatis.annotations.Select; 8 import org.apache.ibatis.annotations.Update; 9 10 import com.example.myproject.entity.User; 11 12 public interface UserDao { 13 @Select("SELECT * FROM user") 14 List<User> getAll(); 15 16 @Select("SELECT * FROM user WHERE username = #{username}") 17 User getOne(String username); 18 19 @Insert("INSERT INTO user(username,password,name,email) VALUES(#{username}, #{password}, #{name}, #{email})") 20 void insert(User user); 21 22 @Update("UPDATE user SET name=#{name} WHERE username =#{username}") 23 void updateNameByUsername(User user); 24 25 @Delete("DELETE FROM user WHERE username =#{username}") 26 void delete(String username); 27 }
5.service层代码
1 package com.example.myproject.service; 2 3 import java.util.List; 4 5 import com.example.myproject.entity.User; 6 7 public interface UserService { 8 /** 9 * 查询全部user 10 * @return 11 */ 12 List<User> getAll(); 13 /** 14 * 根据username查询一条user 15 * @param username 16 * @return 17 */ 18 User getOne(String username); 19 /** 20 * 插入一条user 21 * @param user 22 */ 23 void insert(User user); 24 /** 25 * 根据username查到user，修改name 26 * @param user 27 */ 28 void updateNameByUsername(User user); 29 /** 30 * 删除user 31 * @param username 32 */ 33 void delete(String username); 34 }
1 package com.example.myproject.service.impl; 2 3 import java.util.List; 4 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Service; 7 8 import com.example.myproject.dao.UserDao; 9 import com.example.myproject.entity.User; 10 import com.example.myproject.service.UserService; 11 12 @Service("userService") 13 public class UserServiceImpl implements UserService { 14 15 16 @Autowired 17 private UserDao userDao; 18 19 @Override 20 public List<User> getAll() { 21 return userDao.getAll(); 22 } 23 24 @Override 25 public User getOne(String username) { 26 return userDao.getOne(username); 27 } 28 29 @Override 30 public void insert(User user) { 31 userDao.insert(user); 32 } 33 34 @Override 35 public void updateNameByUsername(User user) { 36 userDao.updateNameByUsername(user); 37 } 38 39 @Override 40 public void delete(String username) { 41 userDao.delete(username); 42 } 43 44 }
6.controller代码：
1 package com.example.myproject.action; 2 3 import java.util.List; 4 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.bind.annotation.ResponseBody; 9 import org.springframework.web.bind.annotation.RestController; 10 11 import com.example.myproject.entity.User; 12 import com.example.myproject.service.UserService; 13 14 @Controller 15 public class HelloWorldController { 16 17 18 @Autowired(required = false) 19 private UserService userService; 20 21 22 @RequestMapping("/getAll") 23 public @ResponseBody List<User> getAll() { 24 return userService.getAll(); 25 } 26 27 @RequestMapping("/getOne") 28 public @ResponseBody User getOne(String username) { 29 return userService.getOne(username); 30 } 31 32 @RequestMapping("/insert") 33 public @ResponseBody User insert() { 34 User user = new User(); 35 user.setUsername("zs"); 36 user.setPassword("123456"); 37 user.setName("zhangsan"); 38 user.setEmail("123@qq.com"); 39 userService.insert(user); 40 return userService.getOne("zs"); 41 } 42 43 @RequestMapping("/updateNameByUsername") 44 public @ResponseBody User updateNameByUsername() { 45 User user = new User(); 46 user.setUsername("zs"); 47 user.setName("zs1111"); 48 userService.updateNameByUsername(user); 49 return userService.getOne("zs"); 50 } 51 52 @RequestMapping("/delete") 53 public @ResponseBody List<User> delete() { 54 userService.delete("zs"); 55 return userService.getAll(); 56 } 57 }
7.运行代码修改：
1 package com.example; 2 3 import org.mybatis.spring.annotation.MapperScan; 4 import org.springframework.boot.SpringApplication; 5 import org.springframework.boot.autoconfigure.SpringBootApplication; 6 7 @SpringBootApplication 8 //地址到dao层接口处，否则报错 9 @MapperScan("com.example.myproject.dao") 10 public class DemoApplication { 11 12 public static void main(String[] args) { 13 SpringApplication.run(DemoApplication.class, args); 14 } 15 }
至此，只要运行这个main方法，访问 localhost:8080/getAll 就可以运行了。
简单的试用了一下Spring Boot，确实被它简单的配置给惊到了，看来以后自己学点学习的demo时，就用它吧！哈哈。。。
感谢以下博文：
http://www.cnblogs.com/ityouknow/p/6037431.html
http://www.cnblogs.com/ityouknow/p/5662753.html
