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SpringBoot初級練習

本文轉載自   查看原文   2019-06-15 09:09   528    SpringBoot

SpringBoot

一、創建項目出現的問題

問題1、application.yml文件無法識別
	*解決方法：File->Settions->Plugins目錄下
	選中YAML，重啟IDEA
問題2、application.yml文件圖標錯誤
	*解決方法：File->Settings->File Types下
	刪除*.yml

二、創建一個SpringBoot的項目

  1. New Project

  2. 選擇Spring Initializr

  3. 選擇Web下的Web，然后Flish

  4. 導入依賴

     <!--SpringBoot起步依賴-->
 <parent>
 	<groupId>org.springframework.boot</groupId>
 	<artifactId>spring-boot-starter-parent</artifactId>
 	<version>2.1.5.RELEASE</version>
 </parent>

 <dependencies>
 	<!--web功能的起步依賴：SpringBoot集成SpringMVC進行Controller開發-->
 	<dependency>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-web</artifactId>
 	</dependency>
 	<!--熱部署-->
 	<dependency>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-devtools</artifactId>
 	</dependency>
 </dependencies>

  5. IDEA設置，完成熱部署

    1. 在Settings中找到Compiler，選中Build Project automatically
    2. 按Ctrl+Shift+Alt+/:選中compiler.automake.allow.when.app.running

底層分析：

spring-boot-starter-parent：springboot起步依賴
	在spring-boot-starter-parent中
	resources資源引入：
		${basedir}/src/main/resources下的
			application*.yml
			application*.yaml
			application*.properties文件
	在spring-boot-dependencies中
		自動根據spring-boot-starter-parent的版本匹配相應的版本，進行了版本控制的作用
	
自動配置分析：
	@SpringBootApplication
		標志該類是一個配置類：@Configration

三、SpringBoot整合Mybatis

第1步：導依賴：
<!--mybatis起步依賴-->
<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>2.0.1</version>
</dependency>

<!--MySQL依賴-->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.6</version>
</dependency>

第2步：yml配置文件
#數據庫配置spring:
#配置Mybatis配置信息
#spring集成Mybatis環境
#pojo別名掃描包
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=UTF-8&useSSL=false
username: root
password: 123456

mybatis:
	type-aliases-package: com.zero.domain
	mapper-locations: classpath:mapper/*Mapper.xml

第3步：創建實體
package com.zero.domain;

public class User {
	private Integer id;
	private String name;
	private String pass;

	public Integer getId() {
    	return id;
	}

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

	public String getName() {
    	return name;
	}

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

	public String getPass() {
    	return pass;
	}

	public void setPass(String pass) {
    	this.pass = pass;
	}

	@Override
	public String toString() {
    	return "User{" +
            "id=" + id +
            ", name='" + name + '\'' +
            ", pass='" + pass + '\'' +
            '}';
		}
	}

第4步：創建接口
package com.zero.mapper;

import com.zero.domain.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {

	public List<User> queryUserList();

}


第5步：創建映射文件
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zero.mapper.UserMapper">
	<select id="queryUserList" resultType="user">
    	SELECT * FROM demo
	</select>
</mapper>


第6步：測試
package com.zero.controller;

import com.zero.domain.User;
import com.zero.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

//以json格式或字符串格式回寫
@RestController
public class democontroller {

	@Autowired
	private UserMapper userMapper;

	@RequestMapping("/quick")
	public List<User> queryUserList(){
    	List<User> users = userMapper.queryUserList();

    	return users;

	}
}

四、SpringBoot整合Spring Data JPA

第1步：導入依賴

<!--spring-data-jpa-->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--Mysql驅動-->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.6</version>
</dependency>
<!--jdk9需要導入-->
<dependency>
	<groupId>javax.xml.bind</groupId>
	<artifactId>jaxb-api</artifactId>
	<version>2.3.0</version>
</dependency>

第2步：創建實體，使用注解進行配置

package com.zero.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private String pass;

public Integer getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

public String getPass() {
    return pass;
}

public void setPass(String pass) {
    this.pass = pass;
}

@Override
public String toString() {
    return "User{" +
            "id=" + id +
            ", name='" + name + '\'' +
            ", pass='" + pass + '\'' +
            '}';
}
}

第3步：創建接口
package com.zero.reposytory;

import com.zero.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;

public interface UserReposytory extends JpaRepository<User,Integer> {

	public List<User> findAll();

}

第4步：創建yml配置

spring:
	datasource:
		driver-class-name: com.mysql.jdbc.Driver
		url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=UTF-8&useSSL=false
		username: root
		password: 123456
#JPA Configuration
	jpa:
		database: MySQL
		show-sql: true
		generate-ddl: true
		hibernate:
  			ddl-auto: update

第5步：測試

package com.zero;

import com.zero.domain.User;
import com.zero.reposytory.UserReposytory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;


@RunWith(SpringRunner.class)
@SpringBootTest(classes = Demo614Application.class)
public class JpaTest {
	@Autowired
	private UserReposytory userReposytory;

	@Test
	public void test(){
    	List<User> all = userReposytory.findAll();
    	System.out.println(all);
	}
}

五、Redis緩存

第1步：配置yml文件信息

#redis
redis:
	host: 127.0.0.1
	port: 6379

第2步：測試
package com.zero;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.zero.domain.User;
import com.zero.reposytory.UserReposytory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Demo614Application.class)
public class RedisTest {

	@Autowired
	private RedisTemplate<String,String> redisTemplate;

	@Autowired
	private UserReposytory userReposytory;

	@Test
	public void test() throws JsonProcessingException {
    	//1.從Redis中獲取數據,json字符串
    	String s = redisTemplate.boundValueOps("user.findall").get();
    	//2.判斷Redis中是否存在想要的數據
    	if(null==s){
        	//3.1:不存在，從數據庫中查詢
        	List<User> all = userReposytory.findAll();
        	//3.2:將查詢出的數據存儲到Redis中
        	//通過web先將集合換換成json的字符串，使用Jackson進行轉換
        	ObjectMapper ob = new ObjectMapper();
        	s = ob.writeValueAsString(all);
        	redisTemplate.boundValueOps("user.findall").set(s);
        	System.out.println("從數據庫中獲取數據");
    	}else {
        	System.out.println("從Redis緩存中獲取數據");
    	}

    	//4.將數據打印在控制台
    	System.out.println(s);
	}
}


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