SpringBoot 项目以jar 包方式获取ApplicationContext 和SpringBoot项目以war 包方式获取ApplicationContext

我就是我 2023-10-10 12:12 52阅读 0赞

问题场景:今天遇到ApplicationContext 获取Bean 对象总是为null 的问题，我在本地启动SpringBoot 项目正常访问，但是将SpringBoot 项目打包成war 包部署到Tomcat的服务器获取Bean对象总是提示为null。

项目结构关系：springboot-provider 为服务提供者(采用war 包方式部署在tomcat中)

springboot-consumer为服务消费者(采用jar 包方式启动) 备注:两者的服务调用是通过alibaba dubobo 协议实现

springboot-import 为xml 转实体对象工具jar,其中有两个类对象，需要依赖后台接口服务（查询字典数据）

springboot-provider 程序入口(未修改之前)

import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.boot.web.support.SpringBootServletInitializer;
    import org.springframework.context.ApplicationContext;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    import org.springframework.web.context.support.WebApplicationContextUtils;
    
    
    /**
     * 系统服务提供者
     * 
     * @author zzg
     *
     */
    @SpringBootApplication
    @EnableTransactionManagement
    @MapperScan("com.digipower.ucas.mapper")
    public class Provider extends SpringBootServletInitializer {
    
    	public static void main(String[] args) {
    		ApplicationContext applicationContext = SpringApplication.run(Provider.class, args);
    		SpringContextUtil.setApplicationContext(applicationContext);
    		System.out.println("============= SpringBoot gcxt-system-provider Service Start Success =============");
    	}
    
    	@Override
    	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    		// 注意这里要指向原先用main方法执行的Application启动类
    		return builder.sources(Provider.class);
    	}
    
    
    }

springboot-provider 程序入口(修改后)

import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.boot.web.support.SpringBootServletInitializer;
    import org.springframework.context.ApplicationContext;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    import org.springframework.web.context.support.WebApplicationContextUtils;
    
    
    /**
     * 系统服务提供者
     * 
     * @author zzg
     *
     */
    @SpringBootApplication
    @EnableTransactionManagement
    @MapperScan("com.digipower.ucas.mapper")
    public class Provider extends SpringBootServletInitializer {
    
        // springboot 本地启动初始化applicationContext
    	public static void main(String[] args) {
    		ApplicationContext applicationContext = SpringApplication.run(Provider.class, args);
    		SpringContextUtil.setApplicationContext(applicationContext);
    		System.out.println("============= SpringBoot gcxt-system-provider Service Start Success =============");
    	}
    
    	@Override
    	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    		// 注意这里要指向原先用main方法执行的Application启动类
    		return builder.sources(Provider.class);
    	}
    
         // tomcat方式启动初始化applicationContext
    	@Override
    	public void onStartup(ServletContext servletContext) throws ServletException {
    		super.onStartup(servletContext);
    		SpringContextUtil
    				.setApplicationContext(WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext));
    	}
    
    }

springboot-import 转换工具类使用@Configuration 注解标签初始化化相关Bean

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    
    import ****.field.DataDictFieldProcess;
    import ****..field.PersonCategoryFieldProcess;
    
    
    /**
     * 电子包接收配置
     * @author zzg
     *
     */
    @Configuration
    @ComponentScan({"***.impexp.field"}) //集成第三方jar 包推荐使用
    public class ReceiveConfig {
    	@Autowired
    	private SysDataDictService sysDataDictService;
    	
    	@Bean("PersonCategory")
    	public PersonCategoryFieldProcess personCategory(){
    		return new PersonCategoryFieldProcess();
    	}
    	
    	@Bean("DataDict")
    	public DataDictFieldProcess dataDict(){
    		return new DataDictFieldProcess(sysDataDictService);
    	}
    }