关于java:PageHelper插件

增加依赖

<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.3.0</version></dependency>

间接写在控制器层：

1.PageHelper.startPage(1,3)                .doSelectPageInfo(new ISelect() {                    @Override                    public void doSelect() {                        sysNoticeService.findNotices(notice);                    }2. return new JsonResult(PageHelper.startPage(1, 3)                  .doSelectPageInfo(()->//lambda                     sysNoticeService.findNotices(notice)));*/                  

定义工具类：

获取申请对象         ServletRequestAttributes sra=         (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();         HttpServletRequest request=sra.getRequest(); 获取申请中的分页参数对象           String pageCurrentStr=request.getParameter("pageCurrent");           String pageSizeStr=request.getParameter("pageSize");           int pageCurrent=pageCurrentStr?1:Integer.parseInt(pageCurrentStr);           int pageSize==pageSizeStr?3:Integer.parseInt(pageSizeStr); 启动分页查问           return PageHelper.startPage(pageCurrent, pageSize);

代码不反复编写，创立多个类:

创立PageUtile类：package com.cy.pj.common.util;import com.github.pagehelper.Page;import com.github.pagehelper.PageHelper;import javax.servlet.http.HttpServletRequest;/** * 定义分页操作工具类，在此类办法外部启动分页查问 */public class PageUtil{       public static <T>Page<T> startPage(){           //获取申请对象           HttpServletRequest request=ServletUtil.getRequest();           //获取申请中的分页参数对象           String pageCurrentStr=request.getParameter("pageCurrent");           String pageSizeStr=request.getParameter("pageSize");           int pageCurrent=StringUtil.isEmpty(pageCurrentStr)?1:Integer.parseInt(pageCurrentStr);           int pageSize=StringUtil.isEmpty(pageSizeStr)?3:Integer.parseInt(pageSizeStr);           //启动分页查问           return PageHelper.startPage(pageCurrent, pageSize);       }}创立ServletUtil类：package com.cy.pj.common.util;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServletUtil {    /**     * 获取HttpServletRequest申请对象     * @return     */    public static HttpServletRequest getRequest(){        return getServletRequestAttributes().getRequest();    }    public static HttpServletResponse getResponse(){        return getServletRequestAttributes().getResponse();    }    /**     * 通过spring提供的RequestContextHolder对象获取申请属性对象     * @return     */    public static ServletRequestAttributes getServletRequestAttributes(){       // String className=        // RequestContextHolder.getRequestAttributes().getClass().getName();        //System.out.println("className="+className);        return (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();    }}创立StringUtil类：package com.cy.pj.common.util;public class StringUtil {    /**     * 断定字符串是否为空(null,"")     * @param content     * @return     */    public static boolean isEmpty(String content){        return content==null||"".equals(content);    }    //....}