java - SSH框架中寫分頁時service層中不能注入分頁類

Question

service層

@Service
public 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)}


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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)}


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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)}


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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,請問為什麼？

Answer 1

PageUntil這個類別也是要用@Component

Answer 2

你沒有正確使用@Resource,導致設定檔裡面找不到名稱屬性為"iauthoradmindao"的，故而注入失敗!你可以將@Resource 更換成 @AutoWired 試試看。這兩個註解的注入方式是不一樣的，當然前提是你的xml檔案中要配有"IAuthorAdminDao "類型的

詳情參考：https://www.zhihu.com/questio...

Answer 3

我覺得 new出來最簡單了。你這個類別需要考慮到特殊的問題嗎？