java - SSH框架中写分页时service层中不能注入分页类

问题描述

service层

@Servicepublic class AuthorAdminServiceImpl implements IAuthorAdminService { @Resource private IAuthorAdminDao iauthoradmindao; @Resource PageUntil<AuthorAdmin> pageUntil;@Override public PageUntil<AuthorAdmin> findByPage(int currentPage) {pageUntil.setCurrentPage(currentPage);// 当前多少页int pageSize = 3;pageUntil.setPagesize(pageSize);// 最多显示多少记录int totalCount = iauthoradmindao.findCount();// 数据库中所有的记录pageUntil.setTotalCount(totalCount);double tc = totalCount;Double num = Math.ceil(tc / pageSize);// 页面显示的总页数=数据库的总记录数/最多显示多少记录pageUntil.setTotalPage(num.intValue());int begin = (currentPage - 1) * pageSize;// 当前页开头位置的索引List<AuthorAdmin> list = iauthoradmindao.findByPage(begin, pageSize);if(list==null){ System.out.println('list findByPage service error');}pageUntil.setList(list);return pageUntil; }

action层

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,请问为什么？

问题解答

PageUntil这个类也是要用@Component

你没有正确使用@Resource,导致配置文件里面找不到名称属性为'iauthoradmindao'的<bean>，故而注入失败!你可以将@Resource 更换成 @AutoWired 试试看。这两个注解的注入方式是不一样的，当然前提是你的xml文件中要配有'IAuthorAdminDao '类型的<bean>

详情参考：https://www.zhihu.com/questio...

我觉得 new出来最简单了。你这个类需要考虑到特殊的问题吗？