Spring Boot 1 创建Demo

Spring Boot的主要优点：

• 为所有Spring开发者更快的入门
• 开箱即用，提供各种默认配置来简化项目配置
• 内嵌式容器简化Web项目
• 没有冗余代码生成和XML配置的要求

入门操作：

1.打开http://start.spring.io/

下载项目压缩包并解压

2.菜单中选择File->New->Project from Existing Sources

3.选择maven,一路next即可。

pom.xml

<?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.qhong</groupId>
    <artifactId>SpringBootDemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringBootDemo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.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>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

引入Web模块

当前的pom.xml内容如下，仅引入了两个模块：

• spring-boot-starter：核心模块，包括自动配置支持、日志和YAML
• spring-boot-starter-test：测试模块，包括JUnit、Hamcrest、Mockito

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

创建com.qhong.web包，创建HelloController.java

package com.qhong.web;

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

/**
 * Created by Administrator on 2016/9/21 0021.
 */

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String Index(){
        return "hello world!";
    }
}

点击运行，默认8080端口，被占用

修改SpringBoot端口

方法1：

@SpringBootApplication
public class SpringBootDemoApplication implements EmbeddedServletContainerCustomizer {

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

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.setPort(8071);
    }
}

修改程序入口

2.直接设置application.properties配置文件

server.port=8051

很明显用第二种比较好

@RestController：Spring4之后加入的注解，原来在@Controller中返回json需要@ResponseBody来配合，如果直接用@RestController替代@Controller就不需要再配置@ResponseBody，默认返回json格式。

http://blog.didispace.com/spring-boot-learning-1/

http://blog.csdn.net/isea533/article/details/50281151