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Hibernate+Freemarker分页控件实现

2015-11-27 15:30 387 查看

传到前端的Page

public class Page<T> implements Serializable {
private static final long serialVersionUID = 1L;
private List<T> contents;
private int pageSize;
private int totalSize;
private int curPage;
public Page(int curPage, int totalSize, int pageSize, List<T> contents) {
this.curPage = curPage;
this.totalSize = totalSize;
this.pageSize = pageSize;
this.contents = contents;
}
public List<T> getContents() {
return contents;
}
public void setContents(List<T> 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。

@Controller
public 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<String, Object> 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<Content> 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

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>分页</title>
</head>
<body>
<@cms_content_page>
<ul><#list page.contents as content>
<li>${content.title}</li>
</#list>
</ul>
总共${page.totalSize}条记录  ${page.curPage}/${page.totalPages}页

<#assign href="/javaweb/example/page_">
<a href="${href + "1" + ".html"}">首页</a>
<#if (page.curPage > 1) >
<a href="${href + (page.curPage - 1) + ".html"}">上一页</a>
<#else>
<a href="${href + page.curPage + ".html"}">上一页</a>
</#if>

<#if page.curPage < page.totalPages>
<a href="${href + (page.curPage + 1) + ".html"}">下一页</a>
<#else>
<a href="${href + page.curPage + ".html"}">下一页</a>
</#if>

<a href="${href + page.totalPages + ".html"}">尾页</a>
</@cms_content_page>
</body>
</html>

Hibernate关键实现

public class PageableBaseDao<T> extends AbstractBaseDao<T> implements Pageable<T> {
@Override
public Page<T> 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<T>(curPage, totalSize, pageSize, contents);
}
}

截图

访问http://localhost:8088/javaweb/example/page_3.html

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标签： 分页 freemarker hibernate

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