Hibernate+Freemarker分页控件实现-白红宇

Hibernate+Freemarker分页控件实现

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发布时间：2019-05-11

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传到前端的Page

public class Page
   
     implements Serializable {    private static final long serialVersionUID = 1L;    private List
    
      contents;    private int pageSize;    private int totalSize;    private int curPage;    public Page(int curPage, int totalSize, int pageSize, List
     
       contents) {        this.curPage = curPage;        this.totalSize = totalSize;        this.pageSize = pageSize;        this.contents = contents;    }    public List
      
        getContents() {        return contents;    }    public void setContents(List
       
         contents) {        this.contents = contents;    }    public int getTotalPages() {        return totalSize / pageSize + 1;    }    public int getPageSize() {        return pageSize;    }    public void setPageSize(int pageSize) {        this.pageSize = pageSize;    }    public int getCurPage() {        return curPage;    }    public void setCurPage(int curPage) {        this.curPage = curPage;    }    public int getTotalSize() {        return totalSize;    }    public void setTotalSize(int totalSize) {        this.totalSize = totalSize;    }}

后端实现

解析URL，得到第几页的数据，填充到model data中。

@Controllerpublic class ExampleController {    //例如http://localhost:8088/javaweb/example/page_3.html,    @RequestMapping(value = { "/example/page{pageNo}.html", "/example/page_{pageNo}.html" })    public String page(@PathVariable("pageNo") int pageNo, Map
   
     map) {        if (pageNo <= 0)            pageNo = 1;        FrontUtil.frontPageData(map, pageNo, "/javaweb/example/page_");        return "example/page";    }}

Freemarker自定义指令

public class ContentPageDirective implements TemplateDirectiveModel {
       // private Version version = new Version("2.3.23");    private DefaultObjectWrapperBuilder defaultObjectWrapperBuilder = new DefaultObjectWrapperBuilder(            new Version("2.3.23"));    @Inject    private ContentDao contentDao;    @Override    public void execute(Environment env, @SuppressWarnings("rawtypes") Map params, TemplateModel[] loopVars,            TemplateDirectiveBody body) throws TemplateException, IOException {        // TODO Auto-generated method stub        try {            int pageNo = FrontUtil.getPageNo(env);            Page
   
     page = contentDao.getPage(pageNo);            env.setVariable("page", defaultObjectWrapperBuilder.build().wrap(page));            if (body != null) {                body.render(env.getOut());            }        } catch (ClientException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

前端实现


   分页    <@cms_content_page>        
   
    <#list page.contents as content>                 
    ${content.title}
            
            
   
    总共${page.totalSize}条记录  ${page.curPage}/${page.totalPages}页    <#assign href="/javaweb/example/page_">    首页    <#if (page.curPage > 1) >        上一页    <#else>        上一页    
       <#if page.curPage < page.totalPages>        下一页    <#else>        下一页    
       尾页

Hibernate关键实现

public class PageableBaseDao
   
     extends AbstractBaseDao
    
      implements Pageable
     
       {
       @Override    public Page
      
        getPage(int curPage) throws ClientException {        // TODO Auto-generated method stub        if (curPage < 1) {            throw new ClientException("page number should large than 0");        }        int totalSize = getCount();        int pageSize = PageConstant.SIZE_PER_PAGE;        Criteria criteria = getSession().createCriteria(entityClass);        criteria.setFirstResult((curPage - 1) * pageSize);        criteria.setMaxResults(pageSize);        List contents = criteria.list();        return new Page
       
        (curPage, totalSize, pageSize, contents);    }}