SpringBoot - 1 - New Spring Star

工具：Spring Tool Suite 3.8.4
Spring Boot：极简化了一个web项目的配置。

1.创建SpringBoot模板工程

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SB版本、资源整合

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2.生成springboot模板整合了web的工程

工程结构包名出了点小意外，手动修改回想要的就可以，还有是测试的配置文件目录需要自己手动添加下(src/test/resources)。
application.properties文件是空空如也什么也没有的。

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POM.xml，自动依赖了springboot

<?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>cn.thinglin.springboot.demo</groupId>
    <artifactId>cn.thinglin.springboot.demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>cn.thinglin.springboot.demo</name>
    <description></description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </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>

依赖包中已经加入了web工程开发所需要的大部分jar包

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3.基本使用

Application.java类是项目入口

package cn.thinglin.springboot.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

@SpringBootApplication注解集成了很多注解，包括自动配置

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写的controller、service等使用了注解让spring扫描的类需要写在Application类同级包或更多级都可以但不能不在这个包之前，如我写一个Rest风格的controller

在Application所在包下新建一级ctrl包并创建一个java类TestRestCtrl.java

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TestRestCtrl.java

package cn.thinglin.springboot.demo.ctrl;

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

@RestController /* RestController直接回JSON格式的ResponseBody */
@RequestMapping("/test")
public class TestRestCtrl {

    @RequestMapping("test.json")
    public String test(){
        return "test Spring Boot";
    }
    
}

写完直接在Application运行

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监听了8080端口

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访问成功但是没看到rest的风格

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4.Rest

增加一个Pojo，一个普通的Javabean

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package cn.thinglin.springboot.pojo;

import java.util.ArrayList;

public class TestPojo {

    private String uid;
    private String desc;
    private int ret;
    private ArrayList<String> data;
    
    public TestPojo() {
        super();
    }
    
    public TestPojo(String uid, String desc, int ret, ArrayList<String> data) {
        super();
        this.uid = uid;
        this.desc = desc;
        this.ret = ret;
        this.data = data;
    }
    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getDesc() {
        return desc;
    }
    public void setDesc(String desc) {
        this.desc = desc;
    }
    public int getRet() {
        return ret;
    }
    public void setRet(int ret) {
        this.ret = ret;
    }
    public ArrayList<String> getData() {
        return data;
    }
    public void setData(ArrayList<String> data) {
        this.data = data;
    }
    
}

TestRestCtrl.java新增加一个testRest.json接口

package cn.thinglin.springboot.demo.ctrl;

import java.util.ArrayList;
import java.util.UUID;

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

import cn.thinglin.springboot.pojo.TestPojo;

@RestController /* RestController直接回JSON格式的ResponseBody */
@RequestMapping("/test")
public class TestRestCtrl {

    @RequestMapping("test.json")
    public String test(){
        return "test Spring Boot";
    }
    
    @RequestMapping("testRest.json")
    public TestPojo testRest(){
        ArrayList<String> data = new ArrayList<String>();
        data.add("元素1");
        data.add("元素2");
        return new TestPojo(UUID.randomUUID().toString(), "SB真是好东西",200,data);
    } 
    
}

自动把对象转化成JSON格式数据了，如果数据是Map格式也会被直接转成键值对的JSON对象

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