是时候将javax替换为Jakarta了

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开始

相信很多朋友在使用新版本的Spring的时候，发现了一些叫jakarta的包，看起来有点陌生。

很多时候，比较纠结不知道该导入哪一个包。

jakarta其实就是之前的javax。

主要JavaEE相关的，从之前javax名字也可以看出来，主要是扩展部分，最典型的就是Servlet。

Oracle已经将JavaEE捐献给了Eclipse基金会，从JavaEE 8开始就被正式被改名为jakarta EE

jakarta EE官网

eclipse Jakarta组

javax这个包是Oracle的，涉及商标和版权原因，所以改名也很正常。

<dependency> <groupId>jakarta.servlet</groupId> <artifactId>jakarta.servlet-api</artifactId> <version>6.1.0-M1</version> <scope>provided</scope> </dependency> 

javax.servlet在2018年之后就没有更新了，因为2018年Oracle把JavaEE捐赠给Eclipse基金会之后项目就迁移了。

<dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</scope> </dependency> 

下面我们就以Druid为例，来看一看。

Druid starter方式

可以使用druid的starter

<dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.2.20</version> </dependency> 

spring.datasource.initial-size=5 spring.datasource.min-idle=5 spring.datasource.max-active=25 spring.datasource.max-wait=1000 spring.datasource.time-between-eviction-runs-millis=60000 spring.datasource.validation-query=SELECT 1 as nums spring.datasource.test-while-idle=true spring.datasource.test-on-borrow=false spring.datasource.test-on-return=false spring.datasource.pool-prepared-statements=true spring.datasource.max-pool-prepared-statement-per-connection-size=20 spring.datasource.druid.filters=stat,wall,slf4j spring.druid.stat-view-servlet.enabled=true spring.druid.stat-view-servlet.url-pattern=/druid/* spring.druid.stat-view-servlet.login-username=tim spring.druid.stat-view-servlet.login-password= spring.druid.web-stat-filter.enabled=true spring.druid.web-stat-filter.url-pattern=/* spring.druid.web-stat-filter.exclusions='*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*' spring.druid.filter.stat.slow-sql-millis=1000 spring.druid.filter.stat.log-slow-sql=true spring.druid.filter.stat.enabled=true spring.druid.filter.wall.enabled=true spring.druid.filter.wall.config.drop-table-allow=false spring.druid.filter.wall.config.select-all-column-allow=false 

自定义Config

也可以直接使用druid

<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.20</version> </dependency> 

import com.alibaba.druid.pool.DruidDataSource; import com.alibaba.druid.support.jakarta.StatViewServlet; import com.alibaba.druid.support.jakarta.WebStatFilter; import lombok.extern.slf4j.Slf4j; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.boot.web.servlet.ServletRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import javax.sql.DataSource; import java.sql.SQLException; import java.util.List; @Configuration @Slf4j public class DruidDataSourceConfig { 
    @ConfigurationProperties(prefix = "spring.datasource") @Bean public DataSource dataSource() { 
    DruidDataSource druidDataSource = new DruidDataSource(); try { 
    druidDataSource.setFilters("stat,wall"); } catch (SQLException e) { 
    log.error(e.getMessage(),e); } return druidDataSource; } @Bean public ServletRegistrationBean<StatViewServlet> statViewServlet() { 
    StatViewServlet statViewServlet = new StatViewServlet(); ServletRegistrationBean<StatViewServlet> servletRegistrationBean = new ServletRegistrationBean<>(statViewServlet, "/druid/*"); servletRegistrationBean.addInitParameter("loginUsername", "druid"); servletRegistrationBean.addInitParameter("loginPassword", ""); return servletRegistrationBean; } @Bean public FilterRegistrationBean<WebStatFilter> webStatFilter() { 
    WebStatFilter webStatFilter = new WebStatFilter(); FilterRegistrationBean<WebStatFilter> filterRegistrationBean = new FilterRegistrationBean<>(webStatFilter); // 设置统计的Web URL filterRegistrationBean.setUrlPatterns(List.of("/*")); // 设置排除的Web URL filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"); return filterRegistrationBean; } } 

druid github