Springboot

SpringBoot简介

  Spring Boot是由Pivotal团队提供的全新框架,其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置,从而使开发人员不再需要定义样板化的配置。

SpringBoot特性

  1. SpringBoot并不是对Spring功能上的增强,而是提供了一种快速创建独立的Spring应用程序的框架

  2. 嵌入的Tomcat,无需部署WAR文件

  3. 简化Maven配置

  4. 自动配置Spring

  5. 绝对没有代码生成和对XML没有要求配置

  6.备受关注,是下一代框架,已经是不争的事实,不需要学习springmvc

  7.微服务的入门级微框架,springboot是springcloud的基础

SpringBoot创建

  步骤一:

  

 

 

   步骤二:

  

 

 

   步骤三:

  

 

 

   步骤四:

  

 

 

   步骤五:(依赖)

    <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>
        </dependency>
        <!-- 引入springboot-mybatis的依赖 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

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

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.32</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

  Springboot(一个主程序)

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
public class Springboot {
    public static void main(String[] args) {
        SpringApplication.run(Springboot.class, args);
    }
}

 

  Controller

@Controller
public class myconterller {
    @RequestMapping("/hello")
    @ResponseBody
    public String deom(){
        return "Hello Word!!!";
    }
}

  启动后观察(我们没有妹纸tomcat,却已有tomcat启动)

  

 

 

   完成:

  

简单化部署

  SpringBoot很强大,基本都不需要配置什么,就可以直接开发一个web程序。

  当然了,它强大的还不止这个,还有项目部署这一块。

  有了SpringBoot,我们可以直接把应用打包成一个可执行的jar包,

  放在服务器上直接启动就可以用了。

  打包是需要借助一个插件的,我们在初始化maven工程的时候已经把这个插件写到了pom文件中。

  步骤一:(确保pom文件中有这个)

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

  步骤二:右侧打开Maven,单击packge

  

 

 

  步骤三:找到打包后的jar

 

  

  步骤四:打开

  

 

 

   步骤五:找到刚刚打包的文件(使用java -jar 名字)  

  

 

 

   步骤六:(效果一样)

  

  按照上面的步骤新加代码

  注意1:主程序必须要与其改扫描的包在同一级

  

 

 

   小小异常捕获:

  controller

@RestController
@RequestMapping("/login")
public class FirstControler{
    @RequestMapping("/one")
    public String one(){
        int a=5/0;
        System.out.println("进来啦!!!");
        return "梅川酷子";
    }
}

  捕获类

@ControllerAdvice
public class by {
    @ExceptionHandler(RuntimeException.class)
    @ResponseBody
    public Map<String,Object> ex(){
        Map<String,Object> map=new HashMap<>();
        map.put("您好!","服务器出现异常");
        return map;
    }
}

Springboot与templates

  

  pom文件中增加freemarker的依赖

<!-- 添加freemarker模版的依赖 -->

   <dependency>

            <groupId>org.springframework.boot</groupId>  

            <artifactId>spring-boot-starter-freemarker</artifactId>  

   </dependency>

 

application.properties文件中新增freemarker配置

## Freemarker 配置

spring.freemarker.template-loader-path=classpath:/templates/

spring.freemarker.cache=false

spring.freemarker.charset=UTF-8

spring.freemarker.check-template-location=true

spring.freemarker.content-type=text/html

spring.freemarker.expose-request-attributes=false

spring.freemarker.expose-session-attributes=false

spring.freemarker.request-context-attribute=request

 

src/main/resource/templates文件夹中创建helloFtl.ftl文件

  controller

@Controller
@RequestMapping("/oo")
public class index {
    @RequestMapping("/one")
    public String one(ModelMap map){
        map.put("name","梅川酷子");
        return "login";
    }
}

  .ftl文件网页

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    欢迎:${name}


</body>
</html>

 

 

   ebtity

package Springboot.entity;

public class student {
    private Integer stuid;
    private String stuname;

    public Integer getStuid() {
        return stuid;
    }

    public void setStuid(Integer stuid) {
        this.stuid = stuid;
    }

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }
}

  controller

@RequestMapping("pp")
    public String two(ModelMap map){
        List<student> stulist=new ArrayList<>();
        student stu=new student();
        stu.setStuid(1);
        stu.setStuname("梅川酷子");
        stulist.add(stu);
        map.put("stus",stulist);
        return "login";
    }

  .ftl文件网页

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <#list stus as s>
        ${s.stuid}
        ${s.stuname}
    </#list>


</body>
</html>

Springboot使用jsp

  目录结构

  

  依赖

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat.embed</groupId>
      <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>

  主程序

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

  Controller

@Controller
@RequestMapping("/oo")
public class index {
    @RequestMapping("/one")
    public String one(ModelMap map){
        map.put("name","梅川酷子");
        return "demo";
    }
}

  application.yml

spring:
  mvc:
    view:
      prefix: /jsp/
      suffix: .jsp

  jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Springboot_jsp</title>
</head>
<body>
    ${name}
</body>
</html>

  启动

  

热部署

  依赖

<!--热部署-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <optional>true</optional>
 </dependency>




<plugin>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-maven-plugin</artifactId>
          <configuration>
            <fork>true</fork>
          </configuration>
</plugin>

  步骤:

 

 

 

 Ctrl+Shift+Alt+/

 

 

 

 OK了

SpringBoot使用thymeleaf

  目录结构

  

 

  依赖

<!-- 添加thymeleaf模版的依赖 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

  entity

public class student {
    private Integer stuid;
    private String stuname;

    public Integer getStuid() {
        return stuid;
    }

    public void setStuid(Integer stuid) {
        this.stuid = stuid;
    }

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }
}

  主程序

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

  Controller

@Controller
@RequestMapping("/one")
public class index {
    @RequestMapping("/qq")
    public String one(Model model){
        List<student> list=new ArrayList<>();
        student stu1=new student();
        stu1.setStuid(1);
        stu1.setStuname("梅川酷子");
        list.add(stu1);
        model.addAttribute("stulist",list);
        return "index";
    }
}

  application.yml

spring:
  thymeleaf:
    cache: false

  index.xml

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
</head>
<body>
<ul th:each="stu:${stulist}">
    <li>
        <span th:text="${stu.stuid}"></span>
        <span th:text="${stu.stuname}"></span>
    </li>
</ul>
</body>
</html>

  启动

  

 

Springboot与jpa

  目录结构

  

 

  依赖

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.15</version>
    </dependency>

  entity

@Entity
public class student {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer stuid;
    private String stuname;
    private Integer age;

    public Integer getStuid() {
        return stuid;
    }

    public void setStuid(Integer stuid) {
        this.stuid = stuid;
    }

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

  dao

@Repository
public interface Istudao extends CrudRepository<student,Integer> {

}

  service

public interface Istuservice {
    //添加
    public student insertstu(student stu);

    //修改
    public student updatestu(student stu);

    //删除
    public void deletestu(Integer stuid);

    //查询
    public Iterable<student> getAll();
}

  serviceimpl

@Service
public class Istuserviceimpl implements Istuservice {

    @Resource
    private Istudao istudao;

    @Override
    public student insertstu(student stu) {
        return istudao.save(stu);
    }

    @Override
    public student updatestu(student stu) {
        return istudao.save(stu);
    }

    @Override
    public void deletestu(Integer stuid) {
        istudao.delete(stuid);
    }

    @Override
    public Iterable<student> getAll() {
        return istudao.findAll();
    }
}

  Controller

@RestController
@RequestMapping("/stu")
public class stucontroller {

@Resource
private Istuservice istuservice;

//新增数据
@RequestMapping("/insertstu")
public student insertstu(){
student stu=new student();
stu.setStuname("S1");
return istuservice.insertstu(stu);
}

@RequestMapping("/updatestu")
public student updateGrade(){
student stu=new student();
stu.setStuid(1);
stu.setStuname("S5");
return istuservice.updatestu(stu);
}

@RequestMapping("/deletestu")
public void deleteGrade(){
istuservice.deletestu(1);
}


@RequestMapping("/getAllstu")
public Iterable<student> getAllGrade(){
return istuservice.getAll();
}

}

  主程序

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

  application

##数据库四大连接参数
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql:///student
    username: root
    password: 123
##jpa表的生成策略
  jpa:
    hibernate:
      ddl-auto: update

 

posted @ 2019-12-04 14:00  梅川酷子灬  阅读(538)  评论(0编辑  收藏  举报