最近在研究spring框架，今天试着写了一个简单的user操作的restful api, 以下是创建的步骤：
1.创建Maven project
可以用IntelliJ IDEA来创建一个Maven project, 然后添加dependency和plugin:
<?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.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.6.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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.创建project structure
以下是我创建的project结构：
Paste_Image.png
3.创建类文件
1)User.java
@Component
public class User {
private Long id;
private String name;
private int age;
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getAge() { return age; }
public void setAge(int age) { this.age = age; }
public Long getId() { return id; }
public void setId(Long id) { this.id = id; }
}
2)UserController.java
@RestController
@RequestMapping(value = "/users")
public class UserController {
static Map<Long, User> userList = Collections.synchronizedMap(new HashMap<>());
@RequestMapping(value = "/", method = RequestMethod.GET)
public List<User> getUserList(){
List<User> users = new ArrayList<User>(userList.values());
return users;
}
@RequestMapping(value = "/", method = RequestMethod.POST)
public String postUser(@ModelAttribute User newUser){
userList.put(newUser.getId(), newUser);
return "successful";
}
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public User getUser(@PathVariable Long id){
return userList.get(id);
}
@RequestMapping(value = "/{id}", method = RequestMethod.POST)
public String putUser(@PathVariable Long id, @ModelAttribute User user){
User u = userList.get(id);
u.setName(user.getName());
u.setAge(user.getAge());
userList.put(id,u);
return "successful";
}
@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
public String deleteUser(@ModelAttribute Long id){
userList.remove(id);
return "successful";
}
}
3)Application.java
这是程序启动的入口
@SpringBootApplicationpublic class Application {
public static void main(String[] args){
SpringApplication.run(Application.class, args);
}
}
另外有些童鞋可能对文件的归类不是很明白，可以参考以下这段话：
Spring MVC中往往分为Controller（具体接口，处理相应逻辑），dao（数据库工具类），entity（实体类，对应数据库中的表），service（服务类，调用数据库工具类进行操作），其中Service和Dao部分通常通过接口和继承接口的实体类实现
