spring boot 启动web，内嵌tomcat

1.pom.xml文件配置（酌情修改）

<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.nnk.maven.test</groupId>
	<artifactId>test-sample</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<properties>
		<java.version>1.7</java.version>
		<start-class>com.nnk.maven.test.boot.Application</start-class>
	</properties>
	<!-- Inherit defaults from Spring Boot -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.0.1.RELEASE</version>
	</parent>

	<!-- Add typical dependencies for a web application -->
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>

	<build>
		<pluginManagement>
			<plugins>
				<plugin>
					<artifactId>maven-compiler-plugin</artifactId>
					<configuration>
						<source>1.7</source>
						<target>1.7</target>
					</configuration>
				</plugin>
			</plugins>
		</pluginManagement>
	</build>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<url>http://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<url>http://repo.spring.io/milestone</url>
		</repository>
	</repositories>
	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<url>http://repo.spring.io/snapshot</url>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<url>http://repo.spring.io/milestone</url>
		</pluginRepository>
	</pluginRepositories>

</project>

2.实体类User

package com.nnk.maven.test.entity;

/**
 *
 */
public class User {
	private Long id;
	private String name;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		User user = (User) o;

		if (id != null ? !id.equals(user.id) : user.id != null)
			return false;

		return true;
	}

	@Override
	public int hashCode() {
		return id != null ? id.hashCode() : 0;
	}
}

3.控制器Controller

package com.nnk.maven.test.controller;

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

import com.nnk.maven.test.entity.User;

/**
 *
 */
@RestController
@RequestMapping("/user")
public class UserController {

	@RequestMapping("/{id}")
	public User view(@PathVariable("id") Long id) {
		User user = new User();
		user.setId(id);
		user.setName("zhang");
		return user;
	}

}

4.spring-boot（tomcat启动）

package com.nnk.maven.test.boot;

import java.util.HashSet;
import java.util.Set;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 *
 */
@Configuration
@ComponentScan("com.nnk")
@EnableAutoConfiguration
// @SpringBootApplication
public class Application {

	public static void main(String[] args) {
		SpringApplication app = new SpringApplication(Application.class);
		app.setWebEnvironment(true);
		app.setShowBanner(false);

		Set<Object> set = new HashSet<Object>();
		// set.add("classpath:applicationContext.xml");
		app.setSources(set);
		app.run(args);

	}

}

注意：网上大部分@CompoentScan没有后面的value，如果不加必须保证所有的程序在一个包中，不然会出现404.

LZ 也是翻了好几个小时才发现是这个问题，所以写了一个比较完整的，避免来人再犯同样的错误！