1、定义PageModel类
Xml代码
public class PageModel {
private int total;
private List datas;
private int pageSize;
private int offset;
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getOffset() {
return offset;
}
public void setOffset(int offset) {
this.offset = offset;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public List getDatas() {
return datas;
}
public void setDatas(List datas) {
this.datas = datas;
}
}
2、定义ThreadLocal类
Java代码
public class MyThreadLocal {
private static ThreadLocal tl = new ThreadLocal();
public static void setValue(PageModel pm) {
tl.set(pm);
}
public static PageModel getValue() {
PageModel pm = (PageModel) tl.get();
if(pm == null) {
pm = new PageModel();
}
return pm;
}
public static void remove() {
tl.remove();
}
}
3、定义我们自己的拦截器
Java代码
public class PageModelInterceptor extends AbstractInterceptor {
@Override
public String intercept(ActionInvocation invoke) throws Exception {
int offset = 0;
try {
offset = Integer.parseInt(ServletActionContext.getRequest()
.getParameter("pager.offset"));
} catch (NumberFormatException e) {
}
int pageSize = 5;
PageModel pm = MyThreadLocal.getValue();
pm.setOffset(offset<0 ? 0 : offset);
pm.setPageSize(pageSize<0 ? Integer.MAX_VALUE : pageSize);
//将pagemodel中相关的分页数据设置好之后放到Threadlocal中
//在后台进行查询的时候从ThreadLocal中取出PageModel对象然后使用分页数据即可。
MyThreadLocal.setValue(pm);
try {
return invoke.invoke();
}finally {
//注意等到整个拦截器执行完成即一个ThreadLocal完成它的工作后要清除里面的内容
MyThreadLocal.remove();
}
}
}
4、在struts.xml配置文件中加入我们的拦截器
Xml代码
<interceptors>
<!--定义拦截器 -->
<interceptor name="pageModelInterceptor" class="com.bjsxt.oa.util.PageModelInterceptor"/>
<interceptor-stack name="myInterceptorStack">
<interceptor-ref name="exception"/>
<!--加入我们自己定义的拦截器，在拦截器中把分页数据设置到ThreadLocal里然后再dao层取出用于分页 -->
<interceptor-ref name="pageModelInterceptor"/>
<interceptor-ref name="alias"/>
<interceptor-ref name="servletConfig"/>
<interceptor-ref name="i18n"/>
<interceptor-ref name="prepare"/>
<interceptor-ref name="chain"/>
<interceptor-ref name="debugging"/>
<interceptor-ref name="scopedModelDriven"/>
<interceptor-ref name="updatableInterceptor"/>
<interceptor-ref name="modelDriven"/>
<interceptor-ref name="fileUpload"/>
<interceptor-ref name="checkbox"/>
<interceptor-ref name="multiselect"/>
<interceptor-ref name="staticParams"/>
<interceptor-ref name="actionMappingParams"/>
<interceptor-ref name="params">
<param name="excludeParams">dojo\..*,^struts\..*,pager.offset</param>
</interceptor-ref>
<interceptor-ref name="conversionError"/>
<interceptor-ref name="validation">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="myInterceptorStack"/>
