SpringBoot整合axis1.4后,@Autowired注入失败,使用工具类注入
问题描述:
费劲心思搭建好webservices服务端后,没想到客户端调用失败,查看日志文件,发现报空指针异常,debug代码后,发现sql查询的值都是null。通常情况下,我们将Dao注入Service的时候使用@Autowired注解,但是这里显然没有注入进来。
解决方法:
使用SpringContextUtils工具类注入,首先增加SpringContextUtils.java文件,复制如下内容
1 import org.springframework.beans.BeansException; 2 import org.springframework.beans.factory.NoSuchBeanDefinitionException; 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.ApplicationContextAware; 5 import org.springframework.stereotype.Component; 6 /** 7 * @author xuchi 8 * @Description: @Autowired注入无效,使用此工具类注入 9 * 10 */ 11 @Component 12 public class SpringContextUtils implements ApplicationContextAware { 13 private static ApplicationContext applicationContext = null; 14 15 public SpringContextUtils() { 16 } 17 18 public void setApplicationContext(ApplicationContext arg0) throws BeansException { 19 if (applicationContext == null) { 20 applicationContext = arg0; 21 } 22 23 } 24 25 public static ApplicationContext getApplicationContext() { 26 return applicationContext; 27 } 28 29 public static void setAppCtx(ApplicationContext webAppCtx) { 30 if (webAppCtx != null) { 31 applicationContext = webAppCtx; 32 } 33 } 34 35 /** 36 * 拿到ApplicationContext对象实例后就可以手动获取Bean的注入实例对象 37 */ 38 public static <T> T getBean(Class<T> clazz) { 39 return getApplicationContext().getBean(clazz); 40 } 41 42 public static <T> T getBean(String name, Class<T> clazz) throws ClassNotFoundException { 43 return getApplicationContext().getBean(name, clazz); 44 } 45 46 public static final Object getBean(String beanName) { 47 return getApplicationContext().getBean(beanName); 48 } 49 50 public static final Object getBean(String beanName, String className) throws ClassNotFoundException { 51 Class clz = Class.forName(className); 52 return getApplicationContext().getBean(beanName, clz.getClass()); 53 } 54 55 public static boolean containsBean(String name) { 56 return getApplicationContext().containsBean(name); 57 } 58 59 public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { 60 return getApplicationContext().isSingleton(name); 61 } 62 63 public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { 64 return getApplicationContext().getType(name); 65 } 66 67 public static String[] getAliases(String name) throws NoSuchBeanDefinitionException { 68 return getApplicationContext().getAliases(name); 69 } 70 }
代替以往的
1 @Autowired 2 private ManagerDao managerDao;
而使用
1 ManagerDao managerDao = SpringContextUtils.getBean(ManagerDao.class);