SpringBoot之获取Spring容器上下文组件的工具类封装

1. 如在一个普通类中获取HttpServletRequest、HttpServletResponse…等等
2. 以工具类的形式getBen,而不需要@Component、@Service、@Repository 或使用@Autowired注入Ben等
3. 在使用的地方以静态方法获取对象即可

1. SpringBoot版本

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.5.RELEASE</version></parent>

2. Spring容器上下文工具类封装

创建一个工具类，如SpringContextUtils,并实现ApplicationContextAware接口

SpringContextUtils.java配置类如下

package com.yuan.utils;import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.util.ClassUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
yuan
/*** <p>* Description: Spring上下文及核心包中一些公用的核心方法工具类* </p>** @author jinshengyuan* @since 2022/12/17 20:20*/
@Configuration
public class SpringContextUtils implements ApplicationContextAware {/*** 上下文对象实例*/private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {SpringContextUtils.applicationContext = applicationContext;}/*** 获取applicationContext** @return*/public static ApplicationContext getApplicationContext() {return applicationContext;}/*** 获取HttpServletRequest*/public static HttpServletRequest getHttpServletRequest() {return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();}/*** 获取HttpServletResponse*/public static HttpServletResponse getHttpServletResponse() {return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();}public static String getDomain() {HttpServletRequest request = getHttpServletRequest();StringBuffer url = request.getRequestURL();return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString();}public static String getOrigin() {HttpServletRequest request = getHttpServletRequest();return request.getHeader("Origin");}/*** 通过name获取 Bean.** @param name* @return*/public static Object getBean(String name) {return getApplicationContext().getBean(name);}/*** 通过class获取Bean.** @param clazz* @param <T>* @return*/public static <T> T getBean(Class<T> clazz) {return getApplicationContext().getBean(clazz);}/*** 通过name,以及Clazz返回指定的Bean** @param name* @param clazz* @param <T>* @return*/public static <T> T getBean(String name, Class<T> clazz) {return getApplicationContext().getBean(name, clazz);}/*** 在普通类中获取StringRedisTemplate对象** @return*/public static StringRedisTemplate getStringRedisTemplate() {return (StringRedisTemplate) SpringContextUtils.getBean("stringRedisTemplate");}/*** 在普通类中获取RedisTemplate对象** @return*/public static RedisTemplate getRedisTemplate() {return (RedisTemplate) SpringContextUtils.getBean("redisTemplate");}/*** 在普通类中获取JdbcTemplate对象** @return*/public static JdbcTemplate getJdbcTemplate() {return (JdbcTemplate) SpringContextUtils.getBean("jdbcTemplate");}/*** 获取项目的绝对路径** @return*/public final static String getProjectClasspath() {return ClassUtils.getDefaultClassLoader().getResource("").getPath();}}