新建项目,引入web,jpa,mysql,druid,fastjson依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
配置application.properties文件
server.port=9009
#数据库配置文件
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=Sunlu1994
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#连接池配置信息
# 下面为连接池的补充设置,应用到上面所有数据源中
# 初始化大小,最小,最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache,并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
spring.datasource.filters=stat
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
注意:pom中spring-boot-stater-tomcat依赖的scope属性一定要注释掉我们才能在IntelliJ IDEA工具使用SpringBootApplication的形式运行项目!
我们把上一章的实体类、控制器、JPA复制到我们当前项目下
在启动类加入如下内容:
@Bean
public HttpMessageConverters fastJsonConfigure(){
FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
// 空值特别处理
// WriteNullListAsEmpty 将Collection类型字段的字段空值输出为[]
// WriteNullStringAsEmpty 将字符串类型字段的空值输出为空字符串 ""
// WriteNullNumberAsZero 将数值类型字段的空值输出为0
// WriteNullBooleanAsFalse 将Boolean类型字段的空值输出为false
//fastjson默认null不输出(返回的json没有值为null的键值对)
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,SerializerFeature.WriteNullStringAsEmpty,SerializerFeature.WriteNullNumberAsZero);
//附加:处理中文乱码(后期添加)
List<MediaType> fastMedisTypes=new ArrayList<MediaType>();
fastMedisTypes.add(MediaType.APPLICATION_JSON_UTF8);
converter.setSupportedMediaTypes(fastMedisTypes);
//日期格式化
fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
converter.setFastJsonConfig(fastJsonConfig);
return new HttpMessageConverters(converter);
}