問題描述

service層

@Servicepublic class AuthorAdminServiceImpl implements IAuthorAdminService { @Resource private IAuthorAdminDao iauthoradmindao; @Resource PageUntil<AuthorAdmin> pageUntil;@Override public PageUntil<AuthorAdmin> findByPage(int currentPage) {pageUntil.setCurrentPage(currentPage);// 當(dāng)前多少頁int pageSize = 3;pageUntil.setPagesize(pageSize);// 最多顯示多少記錄int totalCount = iauthoradmindao.findCount();// 數(shù)據(jù)庫中所有的記錄pageUntil.setTotalCount(totalCount);double tc = totalCount;Double num = Math.ceil(tc / pageSize);// 頁面顯示的總頁數(shù)=數(shù)據(jù)庫的總記錄數(shù)/最多顯示多少記錄pageUntil.setTotalPage(num.intValue());int begin = (currentPage - 1) * pageSize;// 當(dāng)前頁開頭位置的索引List<AuthorAdmin> list = iauthoradmindao.findByPage(begin, pageSize);if(list==null){ System.out.println('list findByPage service error');}pageUntil.setList(list);return pageUntil; }

action層

public String listAuthorAdmin() {PageUntil<AuthorAdmin> pageuntil = iauthoradminservice.findByPage(currentPage);ActionContext.getContext().getValueStack().push(pageuntil);return 'listSuccess'; }

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ’authorAdminAction’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ’authorAdminServiceImpl’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.lcy.until.PageUntil com.lcy.service.author.admin.AuthorAdminServiceImpl.pageUntil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.lcy.until.PageUntil] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}----------Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ’authorAdminServiceImpl’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.lcy.until.PageUntil com.lcy.service.author.admin.AuthorAdminServiceImpl.pageUntil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.lcy.until.PageUntil] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}----------Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.lcy.until.PageUntil com.lcy.service.author.admin.AuthorAdminServiceImpl.pageUntil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.lcy.until.PageUntil] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}----------Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.lcy.until.PageUntil] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

如果不是使用注入而使用new的方法就行,請問為什么？

問題解答

PageUntil這個類也是要用@Component

你沒有正確使用@Resource,導(dǎo)致配置文件里面找不到名稱屬性為'iauthoradmindao'的<bean>，故而注入失敗!你可以將@Resource 更換成 @AutoWired 試試看。這兩個注解的注入方式是不一樣的，當(dāng)然前提是你的xml文件中要配有'IAuthorAdminDao '類型的<bean>

詳情參考：https://www.zhihu.com/questio...

我覺得 new出來最簡單了。你這個類需要考慮到特殊的問題嗎？