springboot整合HttpServlet获取配置文件参数，并遍历spring容器中所有bean

逃离我推掉我的手 2023-06-13 15:24 1阅读 0赞

# springboot整合HttpServlet获取配置文件参数 #

1、在application.properties配置文件中添加参数

loginName=Jeff
    password=123456

2、创建配置参数类获取配置文件中的参数(ParamConfig.java)

package com.jeff.config;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    /** * @author Jeff * @description 配置参数 * @date 2019/11/17 */
    @Component
    public class ParamConfig { 
    
        @Value("${loginName}")
        private String loginName;
    
        @Value("${password}")
        private String password;
    
        public String getLoginName() { 
            return loginName;
        }
    
        public void setLoginName(String loginName) { 
            this.loginName = loginName;
        }
    
        public String getPassword() { 
            return password;
        }
    
        public void setPassword(String password) { 
            this.password = password;
        }
    }

3、创建spring工具类(SpringUtil.java)

package com.jeff.utils;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    /** * @author Jeff * @description spring工具类 * @date 2019/11/17 */
    @Component
    public class SpringUtil implements ApplicationContextAware { 
    
        private static ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
            if (SpringUtil.applicationContext == null) { 
                SpringUtil.applicationContext = applicationContext;
            }
            System.out.println("---------------------------------------------------------------------");
    
            System.out.println(
                    "========ApplicationContext配置成功,在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,applicationContext="
                            + SpringUtil.applicationContext + "========");
    
            System.out.println("---------------------------------------------------------------------");
        }
    
        /*** * @description 获取applicationContext * @author Jeff * @date 2019/11/17 * @return org.springframework.context.ApplicationContext */
        public static ApplicationContext getApplicationContext() { 
            return applicationContext;
        }
    
        /*** * @description 获取spring容器中所有bean * @author Jeff * @date 2019/11/17 * @return java.lang.String[] */
        public static String[] getAllBean() { 
            return getApplicationContext().getBeanDefinitionNames();
        }
    
        /*** * @description 通过name获取 Bean * @author Jeff * @date 2019/11/17 * @param name * @return java.lang.Object */
        public static Object getBean(String name) { 
            return getApplicationContext().getBean(name);
        }
    
        /*** * @description 通过class获取Bean * @author Jeff * @date 2019/11/17 * @param clazz * @return T */
        public static <T> T getBean(Class<T> clazz) { 
            return getApplicationContext().getBean(clazz);
        }
    
        /*** * @description 通过name, 以及Clazz返回指定的Bean * @author Jeff * @date 2019/11/17 * @param name, clazz * @return T */
        public static <T> T getBean(String name, Class<T> clazz) { 
            return getApplicationContext().getBean(name, clazz);
        }
    
    }

4、创建servlet配置类(ServletConfigure.java)

package com.jeff.config;
    
    import com.jeff.servlet.TestServlet;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    /** * @author Jeff * @description servlet配置 * @date 2019/11/17 */
    @Configuration
    public class ServletConfigure { 
    
        @Bean
        public ServletRegistrationBean<TestServlet> servletRegistrationBean() { 
            return new ServletRegistrationBean<TestServlet>(new TestServlet(), "/testServlet");
        }
    
    }

5、创建测试类(TestServlet.java)

package com.jeff.servlet;
    
    import com.jeff.config.ParamConfig;
    import com.jeff.utils.SpringUtil;
    
    import javax.servlet.ServletConfig;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * @author Jeff * @description 测试springboot整合HttpServlet * @date 2019/11/17 */
    public class TestServlet extends HttpServlet { 
    
        /*** * @description servlet初始化 * @author Jeff * @date 2019/11/17 * @param config * @return void */
        @Override
        public void init(ServletConfig config) throws ServletException { 
            System.out.println("初始化servlet");
            super.init();
            System.out.println("初始化配置参数");
            initParam();
        }
    
        /*** * @description doGet请求 * @author Jeff * @date 2019/11/17 * @param req, resp * @return void */
        public void doGet(HttpServletRequest req, HttpServletResponse resp) { 
            System.out.println("请求类型: GET");
        }
    
        /*** * @description doPost请求 * @author Jeff * @date 2019/11/17 * @param request, response * @return void */
        public void doPost(HttpServletRequest request, HttpServletResponse response) { 
            System.out.println("请求类型: POST");
        }
    
        private void initParam() { 
            ParamConfig bean = (ParamConfig) SpringUtil.getBean("paramConfig");
            System.out.println("loginName：" + bean.getLoginName());
            System.out.println("password：" + bean.getPassword());
            String[] allBean = SpringUtil.getAllBean();
            System.out.println("遍历spring容器中所有bean：");
            for (String beanName : allBean) { 
                System.out.println(beanName);
            }
        }
    
    }

6、启动springboot项目，打开浏览器测试，访问 **http://localhost:8080/testServlet**，在控制台即可看到配置文件中的参数值和spring容器中所有bean  
![在这里插入图片描述][20191117215342345.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA_size_16_color_FFFFFF_t_70]

# 源码地址： #

[https://gitee.com/jiefu813/jf-springboot/tree/jf\_HttpServlet/][https_gitee.com_jiefu813_jf-springboot_tree_jf_HttpServlet]

[20191117215342345.png]: https://img-blog.csdnimg.cn/20191117215342345.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191117215730130.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA==,size_16,color_FFFFFF,t_70
[https_gitee.com_jiefu813_jf-springboot_tree_jf_HttpServlet]: https://gitee.com/jiefu813/jf-springboot/tree/jf_HttpServlet/