spring boot簡單實現rest服務

問題

最開始我是想使用Spring MVC搭建一個簡單的REST服務，去官網看了看教程，如今Spring膽愈來愈大了，須要我集成一個maven的父項目，我並不肯意繼承Spring的父項目。而後，就開始下面的探索之路。

項目結構

項目依賴

<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.zyl</groupId>
	<artifactId>springboot</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<properties>
		<java.version>1.8</java.version>
		<maven.compiler.target>1.8</maven.compiler.target>
		<maven.compiler.source>1.8</maven.compiler.source>
	</properties>
	<dependencies>
		<!-- Import dependency management from Spring Boot -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-dependencies</artifactId>
			<version>1.5.4.RELEASE</version>
			<type>pom</type>
			<scope>import</scope>
		</dependency>
		<!-- This is a web application -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<version>1.5.4.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<build>
		<finalName>springboot</finalName>
		<!-- 第一步：spring boot plugin -->
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

VO

package com.zyl.vo;

public class Demo {
	private boolean ok;
	
	private String name;

	public boolean isOk() {
		return ok;
	}

	public void setOk(boolean ok) {
		this.ok = ok;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

Controller

這裏想要Controller層生效，須要讓Spring作幾件事情：

1. 告訴Spring掃描的組件位置: <context:component-scan base-package="com.zyl.controller" />
2. 告訴Spring啓用MVC: <mvc:annotation-driven />

package com.zyl.controller;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.zyl.vo.Demo;

@RestController
public class DemoController {

    @RequestMapping(value = "/kfc/{name}", method = RequestMethod.GET)
    public Demo greeting(@PathVariable String name) {
    		Demo demo = new Demo();
    		demo.setOk(true);
    		demo.setName(name);
        return demo;
    }
}

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Springboot Created Web Application</display-name>
  <context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/spring-mvc.xml</param-value>
	</context-param>

	<servlet>
		<servlet-name>mvcDispatcher</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value></param-value>
        </init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>mvcDispatcher</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

spring-mvc.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

	<context:component-scan base-package="com.zyl.controller" />

	<mvc:annotation-driven />

</beans>

總結

Spring越作越大，野心和夢想堪比apache。

參考 Building a RESTful Web Service Web MVC framework Spring 4 MVC REST Service Example using @RestController Spring Boot Hello World Example – JSP Spring 3 MVC and JSON example