SpringBoot入门Demo
SpringBoot可以说是Spring的简化版。配置简单、使用方便。主要有以下几种特点:
- 创建独立的Spring应用程序
- 嵌入的Tomcat,无需部署WAR文件
- 简化Maven配置
- 自动配置Spring
- 提供生产就绪型功能,如指标,健康检查和外部配置
- 绝对没有代码生成和对XML没有要求配置
(1)创建maven项目,构建java项目(注意:这里为java项目,也能通过内嵌的tomcat启动服务,访问controller指定路径返回的数据)
项目目录结构如下:
(需要编写的只有三个文件:User.java UserController.java pom.xml)
(2)User.java内容如下:(User.java主要是用于controller类请求方法中需要使用到User实体类)
package SpringBootDemo; public class User { private int id; private String username; private String password; public User(){} public int getId() { return id; } public void setId(int id) { this.id = id; } 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 String toString(){ return "user=[id:"+id+",username:"+username+",password:"+password+"]"; } }
(3)UserController类内容如下:(UserController相当于spring的controller类,但是必须使用@RestController注解标识)
@EnableAutoConfiguration :自动配置 这个注解应该放在SpringBoot项目的启动类的上面 (含有main方法,并且调用了SpringApplication.run(类.class);方法)
@SpringBootApplication : 标明这是SpringBoot的启动类
package SpringBootDemo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * controller类 * @author Administrator * */ @RestController @EnableAutoConfiguration @SpringBootApplication public class UserController { @RequestMapping("/login") public User login(){ User user= new User(); user.setId(123); user.setUsername("qwe"); user.setPassword("456"); return user; } @RequestMapping("/print") public String print1(){ return "HELLO WORLD"; } //这是springBoot的启动入口方法,也可以去新建一个类 ,在类里面调用SpringApplication.run(UserController.class); public static void main(String[] args){ SpringApplication.run(UserController.class); } }
(4)pom.xml文件的配置如下:里面需要添加springBoot的包依赖
<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>springboot.maven</groupId> <artifactId>springboot</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot</name> <url>http://maven.apache.org</url> <build> <finalName>springboot</finalName> <plugins> <plugin> <inherited>true</inherited> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>${compiler.source}</source> <target>${compiler.target}</target> <encoding>${project.build.sourceEncoding}</encoding> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <version>1.5.1.RELEASE</version> </plugin> </plugins> </build> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <compiler.source>1.7</compiler.source> <compiler.target>1.7</compiler.target> <junit.version>4.12</junit.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.1.RELEASE</version> </parent> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project> <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>springboot.maven</groupId> <artifactId>springboot</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot</name> <url>http://maven.apache.org</url> <build> <finalName>springboot</finalName> <plugins> <plugin> <inherited>true</inherited> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>${compiler.source}</source> <target>${compiler.target}</target> <encoding>${project.build.sourceEncoding}</encoding> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <version>1.5.1.RELEASE</version> </plugin> </plugins> </build> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <compiler.source>1.7</compiler.source> <compiler.target>1.7</compiler.target> <junit.version>4.12</junit.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.1.RELEASE</version> </parent> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
(5)启动项目。
进入 UserController类中,右击 --》选择 Run As --》 Java Application
启动成功后,会出现如图结果:
出现了 Started UserController。。。 这句话,标识启动成功,然后就可以去浏览器访问了
(6)访问项目
由于没有编写配置文件,所有以访问SpringBoot项目,默认是省略项目名的,直接使用 http://ip:port/RequestMapping对应的路径
例如本例: http://127.0.0.1:8080/login
就会出现如下结果,如图所示:
原文地址:https://www.cnblogs.com/DFX339/p/8857890.html