springboot入门

最近在学习springboot,因此记录下学习过程中一些小例子，防止以后忘记可以，可以随时复习一下。由于工作中使用的开发工具是eclipse,因此使用eclipse开发。

1.创建pom文件

<?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>4.0.0</modelVersion>
  <groupId>com.huan.springboot</groupId>
  <artifactId>springboot_01_start</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>springboot_01_start</name>
  <description>Spring Boote入门示例</description>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.3.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
  </parent>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>
  <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>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

 2.创建一个实体类

public class User {

  private String username;
  private String password;
  private int age;
  private Date birth;

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public Date getBirth() {
    return birth;
  }

  public void setBirth(Date birth) {
    this.birth = birth;
  }

}

 3.创建一个控制层

@RestController
@RequestMapping("user")
public class UserController {
  @RequestMapping(value = "get/{id}", method = RequestMethod.GET)
  public User getUser(@PathVariable("id") int age) {
    User user = new User();
    user.setAge(age);
    user.setUsername("测试");
    user.setBirth(new Date());
    user.setPassword("123456");
    return user;
  }

  @RequestMapping(value = "/del/{id}", method = RequestMethod.DELETE)
  public String delete(@PathVariable("id") int age) {
    return "delete" + age;
  }

  @RequestMapping(value = "/add", method = RequestMethod.POST)
  public User add(User user) {
    return user;
  }
}
@RequestMapping("user")
public class UserController {
  @RequestMapping(value = "get/{id}", method = RequestMethod.GET)
  public User getUser(@PathVariable("id") int age) {
    User user = new User();
    user.setAge(age);
    user.setUsername("测试");
    user.setBirth(new Date());
    user.setPassword("123456");
    return user;
  }

  @RequestMapping(value = "/del/{id}", method = RequestMethod.DELETE)
  public String delete(@PathVariable("id") int age) {
    return "delete" + age;
  }

  @RequestMapping(value = "/add", method = RequestMethod.POST)
  public User add(User user) {
    return user;
  }
}

 4.启动springboot应用程序

@SpringBootApplication
@ComponentScan("com.springboot")
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

5.启动应用程序

 

/**
 * springboot 程序的启动入口
 * 
 * @描述
 * @作者 huan
 */
@SpringBootApplication
@ComponentScan(basePackages = { "com.huan.springboot" })
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

 

6.测试：  

 

注意：

    1、@SpringBootApplication是一个组合注解，默认会扫描它所在的包以及子包，而我的controller不在它默认的子包下，因此需要加载@ComponentScan注解配置

    2、@RestController也是一个组合注解，在此注解修饰的类下，它下方所有的方法都是以json的格式返回。

    3、默认情况下不需要自己进行配置，springboot会帮我们进行自动配置，若有不符合的地方也是可以进行修改的。

    4、程序启动的默认端口是8080,上下文路径是 /

    5、开发工具可以使用

          idea : 默认支持springboot插件

          sts   : spring 的一个集成eclipse的开发工具，也是可以开发springboot程序

          eclipse : 需要安装一个插件(springsource-tool-suite-3.8.2.RELEASE-e4.5.2-updatesite.zip),且eclipse的版本需要>=4.5.2

          进入springboot的官网，使用 ​​https://start.spring.io/ ​​创建项目。