spring boot 笔记1

demon 目录,公共配置

SbMybatisApplication.java

package com.example.sb_mybatis;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
@MapperScan("com.example.sb_mybatis.mapper")
@ServletComponentScan
public class SbMybatisApplication {

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

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.example</groupId>
    <artifactId>sb_mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.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-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-data-redis</artifactId>
        </dependency>

    </dependencies>

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

</project>

application.properties:

mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
mybatis.type-aliases-package=com.example.sb_mybatis.entity
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
#Druid
spring.datasource.druid.initial-size=3
spring.datasource.druid.min-idle=3
spring.datasource.druid.max-active=10
spring.datasource.druid.max-wait=60000
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=admin
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.slow-sql-millis=2000
#Redis
# Redis 数据库索引（默认为0）
spring.redis.database=0
# Redis 服务器地址
spring.redis.host=127.0.0.1
# Redis 服务器连接端口
spring.redis.port=6379
# Redis 服务器连接密码（默认为空）
spring.redis.password=
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=8
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.pool.min-idle=0
# 连接超时时间（毫秒）
spring.redis.timeout=10000

spring boot + mybatis

User.java

package com.example.sb_mybatis.entity;

import com.example.sb_mybatis.enums.UserSexEnum;
import lombok.Data;

import java.io.Serializable;

@Data
public class User  implements Serializable {
    private Long id;
    private String userName;
    private String passWord;
    private UserSexEnum userSex;
    private String nickName;

    public User(String userName, String passWord, UserSexEnum userSex, String nickName) {
        this.userName = userName;
        this.passWord = passWord;
        this.userSex = userSex;
        this.nickName = nickName;
    }

    public User() {
    }
}

UserSexEnum.java

package com.example.sb_mybatis.enums;

public enum UserSexEnum {
	MAN, WOMAN
}

UserMapper.java

package com.example.sb_mybatis.mapper;

import com.example.sb_mybatis.entity.User;

import java.util.List;

public interface UserMapper {

    List<User> getAll();

    User getOne(Long id);

    void insert(User user);

    void update(User user);

    void delete(Long id);
}

userMapper.xml

<?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.example.sb_mybatis.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.example.sb_mybatis.entity.User">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="userName" property="userName" jdbcType="VARCHAR"/>
        <result column="passWord" property="passWord" jdbcType="VARCHAR"/>
        <result column="user_sex" property="userSex" javaType="com.example.sb_mybatis.enums.UserSexEnum"/>
        <result column="nick_name" property="nickName" jdbcType="VARCHAR"/>
    </resultMap>

    <sql id="Base_Column_List">
        id, userName, passWord, user_sex, nick_name
    </sql>

    <select id="getAll" resultMap="BaseResultMap">
        SELECT
        <include refid="Base_Column_List"/>
        FROM users
    </select>

    <select id="getOne" parameterType="Long" resultMap="BaseResultMap">
        SELECT
        <include refid="Base_Column_List"/>
        FROM users where id = #{id}
    </select>

    <insert id="insert" parameterType="User">
        INSERT INTO users
        (userName, passWord, user_sex, nick_name)
        values (#{userName},#{passWord},#{userSex},#{nickName})
    </insert>

    <update id="update" parameterType="User" >
        UPDATE users SET
        userName=#{userName},passWord=#{passWord},user_sex=#{userSex},nick_name=#{nickName}
    </update>

    <delete id="delete" parameterType="Long" >
        DELETE FROM users where id=#{id}
    </delete>
</mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias alias="Integer" type="java.lang.Integer"/>
        <typeAlias alias="Long" type="java.lang.Long"/>
        <typeAlias alias="HashMap" type="java.util.HashMap"/>
        <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap"/>
        <typeAlias alias="ArrayList" type="java.util.ArrayList"/>
        <typeAlias alias="LinkedList" type="java.util.LinkedList"/>
        <typeAlias alias="User" type="com.example.sb_mybatis.entity.User"/>
    </typeAliases>

</configuration>

测试类，UserService就是直接调用mapper的发方法（代码略）

package com.example.sb_mybatis.service;

import com.example.sb_mybatis.entity.User;
import com.example.sb_mybatis.enums.UserSexEnum;
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 static org.junit.Assert.*;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserServiceTest {

    @Autowired
    UserService service;

    @Test
    public void getAll() {
        System.out.println(service.getAll());
    }

    @Test
    public void getOne() {
        System.out.println(service.getOne(123L));
    }

    @Test
    public void insert() {
        User u = new User("aaa", "123456", UserSexEnum.MAN, "nickname");
        service.insert(u);
    }

    @Test
    public void update() {
        User u = service.getOne(123L);
        u.setNickName("hello");
        service.update(u);
    }

    @Test
    public void delete() {
        service.delete(123L);
    }
}

spring boot + redis

缓存

package com.example.sb_mybatis.conf;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.RedisTemplate;

import java.lang.reflect.Method;

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    public KeyGenerator keyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuilder sb = new StringBuilder();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };
    }

    @Bean
    public CacheManager cacheManager(RedisTemplate redisTemplate) {
        RedisCacheManager rcm = new RedisCacheManager(redisTemplate);
        //设置缓存过期时间
        //rcm.setDefaultExpiration(60);//秒
        return rcm;
    }
}

RedisHttpSession

package com.example.sb_mybatis.conf;

import org.springframework.context.annotation.Configuration;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

@Configuration
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 86400*30)
public class SessionConfig {
}

测试类

package com.example.sb_mybatis.web;

import com.example.sb_mybatis.entity.User;
import com.example.sb_mybatis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
public class RedisTest {

    @Autowired
    UserService userService;

    @RequestMapping("/hello")
    @Cacheable(value = "helloCache")
    public String hello(String name) {
        System.out.println("没有走缓存！");
        return "hello " + name;
    }

    @RequestMapping("/condition")
    @Cacheable(value = "condition", condition = "#name.length() <= 4")
    public String condition(String name) {
        System.out.println("没有走缓存！");
        return "hello " + name;
    }

    @RequestMapping("/u_list")
    @Cacheable(value = "usersCache", key = "#k")
    public List<User> getUsers(String k) {
        List<User> users = userService.getAll();
        System.out.println("执行了数据库操作");
        return users;
    }

    @RequestMapping("/u_list_update")
    @CachePut(value = "usersCache", key = "#k")
    public List<User> getUsers_update(String k) {
        List<User> users = userService.getAll();
        System.out.println("执行了数据库操作");
        return users;
    }

    @RequestMapping("/u_list_del")
    @CacheEvict(value = "usersCache", allEntries = true)
    public List<User> getUsers_del() {
        List<User> users = userService.getAll();
        System.out.println("执行了数据库操作");
        return users;
    }

    @RequestMapping(value = "/setSession", method = RequestMethod.GET)
    public Map<String, Object> setSession (HttpServletRequest request){
        Map<String, Object> map = new HashMap<>();
        request.getSession().setAttribute("request_Url", request.getRequestURL());
        request.getSession().setAttribute("message", request.getRequestURL());
        map.put("request Url", request.getRequestURL());
        return map;
    }

    @RequestMapping(value = "/getSession")
    public Object getSession (HttpServletRequest request){
        Map<String, Object> map = new HashMap<>();
        map.put("sessionId", request.getSession().getId());
        map.put("message", request.getSession().getAttribute("message"));
        map.put("request_Url", request.getSession().getAttribute("request_Url"));
        System.out.println("==getSession==");
        return map;
    }

}

注意：

@Cacheable(value = "usersCache", key = "#k") 和@CachePut(value = "usersCache", key = "#k")需要指定一个相同的key,

访问时url后加上 ?k=123

如果不指定，@CachePut不能更新redis里@Cacheable对应的值，不知道是不是bug,有待进一步了解。