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Simple implementation example code of springmvc paging query

高洛峰

Jan 07, 2017 am 10:19 AM

There are currently two commonly used paging implementation methods:

1. Modify the SQL every time the page is turned, and pass the relevant parameters to the SQL to find out the data of the page in real time in the database and display it. .

2. Find all the data in a certain table in the database, and then process it in the business logic to obtain and display certain data.

For a simple management system with a small amount of data, the first implementation method is relatively easy to use less code to implement the paging function. This article is just for everyone. This method:

Code snippet:

1, Page.java

package com.cm.contract.common; 
  
import org.apache.commons.lang.StringUtils; 
import org.apache.commons.lang.builder.ToStringBuilder; 
  
  
  
/**分頁類 
 * @author FENGWEI 
 * @date 2016-5-23 
 */
public class Page implements java.io.Serializable{ 
    
  private static final long serialVersionUID = 1L; 
  //前一頁 
  private Boolean hasPrePage; 
  //后一頁 
  private Boolean hasNextPage; 
  //每頁顯示多少條:默認20條 
  private Long everyPage = 20L; 
  //總頁數(shù) 
  private Long totalPage; 
  //當前第多少頁:默認第1頁 
  private Long currentPage = 1L; 
  //開始下標 
  private Long beginIndex; 
  //結(jié)束下標 
  private Long endinIndex; 
  //總共多少條 
  private Long totalCount;   
  //排序列名 
  private String sortName;   
  //排序狀態(tài) 
  private String sortState;   
  //排序信息 
  private String sortInfo; 
  //是否排序 
  private Boolean sort = false; 
  private String defaultInfo = " "; 
    
    
    
  public String getDefaultInfo() { 
    return defaultInfo; 
  } 
  
  public void setDefaultInfo(String defaultInfo) { 
    this.defaultInfo = defaultInfo; 
  } 
  
  public String getSortInfo() { 
    return sortInfo; 
  } 
  
  public void setSortInfo(String sortInfo) { 
    this.sortInfo = sortInfo; 
  } 
  
  public String getSortName() { 
    return sortName; 
  } 
  
  public void setSortName(String sortName) { 
    setPageSortState(sortName);    
  } 
  
  public String getSortState() { 
    return sortState; 
  } 
  
  public void setSortState(String sortState) { 
    this.sortState = sortState; 
  } 
  
    
  public Page() { 
  } 
  
  /** 
   * 常用,用于計算分頁 
   * */
  public Page(Long totalRecords){    
    this.totalCount = totalRecords; 
    setTotalPage(getTotalPage(totalRecords));    
  } 
    
  /** 
   * 設置每頁顯示多少條時使用 
   * */
  public Page(Long everyPage,Long totalRecords){  
    this.everyPage = everyPage; 
    this.totalCount = totalRecords; 
    setTotalPage(getTotalPage(totalRecords));    
  } 
    
  /** 
   * @param state  狀態(tài)碼 
   * @param value  到第多少頁或者設置每頁顯示多少條或者為排序列名 
   */
  public void pageState(int index,String value) {         
    sort = false; 
    switch (index) { 
    case 0 :setEveryPage(Long.parseLong(value));break; 
    case 1 :first();break; 
    case 2: previous();break; 
    case 3: next();break; 
    case 4: last();break; 
    case 5: sort = true;sort(value);break; 
    case 6 ://到指定第多少頁 
      setCurrentPage(Long.parseLong(value)); 
      break;      
    } 
  } 
  
  /** 
   * 最前一頁 
   */
  private void first() { 
    currentPage = 1L; 
  } 
  
  private void previous() { 
    currentPage--; 
  } 
  
  private void next() { 
    currentPage++; 
  } 
  
  private void last() { 
    currentPage = totalPage; 
  } 
  
  private void sort(String sortName) {     
    //設置排序狀態(tài) 
    setPageSortState(sortName);    
  } 
      
    
    
  /** 
   * 計算總頁數(shù) 
   * */
  private Long getTotalPage(Long totalRecords) { 
     Long totalPage = 0L;   
     everyPage = everyPage == null ? 10L : everyPage; 
     if (totalRecords % everyPage == 0) 
      totalPage = totalRecords / everyPage; 
     else { 
      totalPage = totalRecords / everyPage + 1; 
     } 
     return totalPage; 
  }   
    
  
  public Long getBeginIndex() { 
    this.beginIndex = (currentPage - 1) * everyPage; 
    return this.beginIndex; 
  } 
  
  public void setBeginIndex(Long beginIndex) { 
    this.beginIndex = beginIndex; 
  } 
  
  public Long getCurrentPage() { 
    this.currentPage = currentPage == 0 ? 1 : currentPage; 
    return this.currentPage; 
  } 
  
  public void setCurrentPage(Long currentPage) { 
    if(0 == currentPage){ 
      currentPage = 1L; 
    } 
    this.currentPage = currentPage; 
  } 
  
  public Long getEveryPage() { 
    this.everyPage = everyPage == 0 ? 10 : everyPage; 
    return this.everyPage; 
  } 
  
  public void setEveryPage(Long everyPage) {    
    this.everyPage = everyPage; 
  } 
  
  public Boolean getHasNextPage() { 
    this.hasNextPage = (currentPage != totalPage) && (totalPage != 0); 
    return this.hasNextPage; 
  } 
  
  public void setHasNextPage(Boolean hasNextPage) { 
    this.hasNextPage = hasNextPage; 
  } 
  
  public Boolean getHasPrePage() { 
    this.hasPrePage = currentPage != 1; 
    return this.hasPrePage; 
  } 
  
  public void setHasPrePage(Boolean hasPrePage) { 
    this.hasPrePage = hasPrePage; 
  } 
  
  public Long getTotalPage() { 
    return this.totalPage; 
  } 
  
  public void setTotalPage(Long totalPage) { 
    if(this.currentPage > totalPage){ 
      this.currentPage = totalPage; 
    } 
    this.totalPage = totalPage; 
  } 
  
  public Long getTotalCount() { 
    return this.totalCount; 
  } 
  
  public void setTotalCount(Long totalCount) { 
    setTotalPage(getTotalPage(totalCount));  
    this.totalCount = totalCount; 
  } 
  
  @Override
  public String toString() { 
    return ToStringBuilder.reflectionToString(this); 
  } 
    
  /** 
   * 設置排序狀態(tài) 
   * */
  private void setPageSortState(String newPageSortName){    
    //判斷之前的排序字段是否為空 
    if(StringUtils.isEmpty(sortName)){ 
      //默認排序為升序 
      this.sortState = PageUtil.ASC;    
      this.sortInfo = PageUtil.PAGE_ASC;            
    }else{ 
      if(StringUtils.equalsIgnoreCase(newPageSortName, sortName)){ 
        //判斷sortState排序狀態(tài)值 
        if(StringUtils.equalsIgnoreCase(sortState, PageUtil.ASC)){ 
          this.sortState = PageUtil.DESC; 
          this.sortInfo = PageUtil.PAGE_DESC;                
        }else{ 
          this.sortState = PageUtil.ASC; 
          this.sortInfo = PageUtil.PAGE_ASC;          
        }         
      }else{ 
        //默認 
        this.sortState = PageUtil.ASC;    
        this.sortInfo = PageUtil.PAGE_ASC; 
      } 
    } 
    sortName = newPageSortName.toLowerCase();       
  } 
  
  public Boolean isSort() { 
    return sort; 
  } 
  
  public void setSort(Boolean sort) { 
    this.sort = sort; 
  } 
  
  
  public Long getEndinIndex() { 
    this.endinIndex = (currentPage) * everyPage; 
    return endinIndex; 
  } 
  
  public void setEndinIndex(Long endinIndex) { 
    this.endinIndex = endinIndex; 
  }   
}

2.PageState.java

package com.cm.contract.common; 
  
import org.apache.commons.lang.StringUtils; 
  
  
  
  
/**分頁狀態(tài)類 
 * @author FENGWEI 
 * @date 2016-5-23 
 */
public enum PageState { 
    
  /** 
   * 設置每頁顯示多少條 
   * */
  SETPAGE, 
  /** 
   * 首頁 
   * */
  FIRST,  
  /** 
   * 向前一頁 
   * */
  PREVIOUS,  
  /** 
   * 向后一頁 
   * */
  NEXT,  
  /** 
   * 末頁 
   * */
  LAST,  
  /** 
   * 排序 
   * */
  SORT, 
  /** 
   * 到第多少頁 
   * */
  GOPAGE; 
  
    
  /** 
   * @param value 索引名稱 
   * @return 返回索引下標 
   */
  public static int getOrdinal(String value) { 
    int index = -1; 
    if (StringUtils.isEmpty(value)) { 
      return index; 
    } 
    String newValue = StringUtils.trim(value).toUpperCase(); 
    try { 
      index = valueOf(newValue).ordinal(); 
    } catch (IllegalArgumentException e) {} 
    return index; 
  } 
}

3 .PageUtil.java

/** 
 * 分頁工具類 
 * @author FENGWEI 
 * @date 2016-5-23 
 */
public class PageUtil { 
    
  public static final String ASC = "asc"; 
  public static final String DESC = "desc"; 
  public static final String PAGE_DESC = "↓"; 
  public static final String PAGE_ASC = "↑"; 
  public static final String PAGE_NULL = " ";  
  public static final String SESSION_PAGE_KEY = "page";   
    
    
  /** 
   * 初始化分頁類 
   * @param initPageSql 未分頁的查詢SQL 
   * @param totalCount  總行數(shù) 
   * @param index    分頁狀態(tài) 
   * @param value    只有在設置每頁顯示多少條時,值不會NULL,其它為NULL 
   */
  public static Page inintPage(Long totalCount,Integer index,String value,Page sessionPage){  
    Page page = null; 
    if(index < 0){ 
       page = new Page(totalCount); 
    }else{ 
       /**每頁顯示多少條*/
       Long everPage = null == value ? 10 : Long.parseLong(value); 
       /**獲取Session中的分頁類,方便保存頁面分頁狀態(tài)*/
       page = sessionPage;        
       page.setEveryPage(everPage); 
       page.setTotalCount(totalCount);       
    }   
    return page;     
  } 
    
    
  
    
  /** 
   * 當頁點擊：首頁,前一頁,后一頁,末頁,排序,到第多少頁時進行分頁操作 
   * @param index 分頁狀態(tài) 
   * @param value 排序字段名或者到第多少頁 
   */
  public static Page execPage(int index,String value,Page sessionPage){  
    Page page = sessionPage;       
    /**調(diào)用方法進行分頁計算*/
    page.pageState(index,value);     
    return page;     
  } 
  
}

4.DefaultController.java This part can be used flexibly

package com.cm.contract.common; 
  
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 
  
import org.springframework.web.bind.annotation.ModelAttribute; 
  
/** 
 * 提取公用的request和response Title:DefaultController Descrption: 
 * 
 * @author FENGWEI 
 * @date 2016-5-6下午3:30:32 
 */
public class DefaultController { 
  
  /** 
   * oracel的三層分頁語句 子類在展現(xiàn)數(shù)據(jù)前,進行分頁計算! 
   * 
   * @param querySql 
   *      查詢的SQL語句,未進行分頁 
   * @param totalCount 
   *      根據(jù)查詢SQL獲取的總條數(shù) 
   * @param columnNameDescOrAsc 
   *      列名+排序方式 : ID DESC or ASC 
   */
  protected Page executePage(HttpServletRequest request, Long totalCount) { 
    if (null == totalCount) { 
      totalCount = 0L; 
    } 
    /** 頁面狀態(tài),這個狀態(tài)是分頁自帶的,與業(yè)務無關(guān) */
    String pageAction = request.getParameter("pageAction"); 
    String value = request.getParameter("pageKey"); 
  
    /** 獲取下標判斷分頁狀態(tài) */
    int index = PageState.getOrdinal(pageAction); 
  
    Page page = null; 
    /** 
     * index < 1 只有二種狀態(tài) 1 當首次調(diào)用時,分頁狀態(tài)類中沒有值為 NULL 返回 -1 2 當頁面設置每頁顯示多少條: 
     * index=0,當每頁顯示多少條時,分頁類要重新計算 
     * */
    Page sessionPage = getPage(request); 
  
    if (index < 1) { 
      page = PageUtil.inintPage(totalCount, index, value, sessionPage); 
    } else { 
      page = PageUtil.execPage(index, value, sessionPage); 
    } 
    setSession(request, page); 
    return page; 
  } 
  
  private Page getPage(HttpServletRequest request) { 
    Page page = (Page) request.getSession().getAttribute( 
        PageUtil.SESSION_PAGE_KEY); 
    if (page == null) { 
      page = new Page(); 
    } 
    return page; 
  } 
  
  private void setSession(HttpServletRequest request, Page page) { 
    request.getSession().setAttribute(PageUtil.SESSION_PAGE_KEY, page); 
  } 
}

Usage method:

5,Controller.java

/** 
   * model 添加的分頁條件 
   * executePage 方法寫在工具類中 
   * @param model 
   */
@Controller
public class CMLogController extends DefaultController { 
@RequestMapping("index.do") 
  public ModelAndView userInto(ModelMap model, String username) { 
    nameStr = username; 
    model.addAttribute("username", nameStr); 
    // 分頁數(shù) 
    Long totalCount = logService.pageCounts(model); 
    // 分頁顯示 
    Page page = executePage(request, totalCount); 
    if (page.isSort()) { 
      model.put("orderName", page.getSortName()); 
      model.put("descAsc", page.getSortState()); 
    } else { 
      model.put("orderName", "logtime"); 
      model.put("descAsc", "desc"); 
    } 
    model.put("startIndex", page.getBeginIndex()); 
    model.put("endIndex", page.getEndinIndex()); 
    ModelAndView mv = new ModelAndView(); 
    // 分頁查詢 
    logList = logService.pageList(model); 
    mv.addObject("logList", logList); 
    mv.setViewName("/jsp/log"); 
    return mv; 
  }}

6. Several query statements in maybatis

//分頁查詢 
<select id="pageList" parameterType="map" resultMap="BaseResultMap">   
      
    select ttt.* from(select tt.*,rownum rn from(select * from CM_LOG 
    <where>      
      <if test="username != null and username != &#39;&#39;"> 
        <!--  
         特別提醒一下， $只是字符串拼接， 所以要特別小心sql注入問題。 
         在開發(fā)時使用: $,方便調(diào)試sql,發(fā)布時使用: # 
        -->
        and username like &#39;%${username}%&#39;           
      </if> 
       <if test="type != null and type != &#39;&#39;"> 
        <!--  
         特別提醒一下， $只是字符串拼接， 所以要特別小心sql注入問題。 
         在開發(fā)時使用: $,方便調(diào)試sql,發(fā)布時使用: # 
        -->
        AND TYPE = #{type,jdbcType=VARCHAR}    
      </if> 
     </where>  
     order by ${orderName} ${descAsc} )tt)ttt 
     <where>  
      <if test="startIndex != null and startIndex != &#39;&#39;"> 
        rn > ${startIndex}           
      </if>  
      <if test="endIndex != null and endIndex != &#39;&#39;">        
         <![CDATA[ and rn <= ${endIndex} ]]>               
      </if>   
     </where>      
</select> 
// 分頁數(shù) 
 <select id="pageCounts" parameterType="map" resultType="long">   
  select count(*) from CM_LOG  
  <where>  
  <if test="username != null and username != &#39;&#39;"> 
    and username like &#39;%${username}%&#39;          
  </if>  
  </where>  
</select>

7. Front page index.jsp

//只需在頁面布局添加該div 
  //username 為條件  
  // <jsp:param name="url" value="/log/index.do?"/>    不帶條件的方式 問號必須存在 
<body > 
  <div align="right" style="height: 20"> 
      <jsp:include page="/jsp/page.jsp"> 
          <jsp:param name="url" value="/log/index.do?username=${username }"/>     
  
        </jsp:include> 
    </div> 
  
    </body >

8, quoted Page.jsp

  <%@ page language="java" contentType="text/html; charset=UTF-8"
  pageEncoding="UTF-8"%> 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 
<c:set var="page" value="${sessionScope.page}" /> 
<c:set var="path" value="${pageContext.request.contextPath}" /> 
<c:set var="url" value="${param.url}" /> 
<c:set var="urlParams" value="${param.urlParams}" /> 
<c:set var="pathurl" value="${path}/${url}" /> 
<tr> 
  <td colspan="5"> 
  ${urlParams } 
    共${page.totalCount}條記錄 共${page.totalPage}頁 每頁顯示${page.everyPage}條 
    當前第${page.currentPage}頁  
    <c:choose> 
      <c:when test="${page.hasPrePage eq false}"> 
        <<首頁 <上頁  
      </c:when> 
      <c:otherwise> 
        <a href="${pathurl}&pageAction=first${urlParams}"><<首頁 </a>  
        <a href="${pathurl}&pageAction=previous${urlParams}" /><上一頁</a> 
      </c:otherwise> 
    </c:choose> 
     ||  
    <c:choose> 
      <c:when test="${page.hasNextPage eq false}"> 
         下頁> 尾頁>> 
      </c:when> 
      <c:otherwise> 
        <a href="${pathurl}&pageAction=next${urlParams}">下一頁> </a>  
        <a href="${pathurl}&pageAction=last${urlParams}">末頁>></a> 
      </c:otherwise> 
    </c:choose> 
       
    <SELECT name="indexChange" id="indexChange"
      onchange="getCurrentPage(this.value);"> 
      <c:forEach var="index" begin="1" end="${page.totalPage}" step="1"> 
        <option value="${index}" ${page.currentPage eq index ? "selected" : ""}> 
          第${index}頁 
        </option> 
      </c:forEach> 
    </SELECT> 
       
    每頁顯示:<select name="everyPage" id="everyPage" onchange="setEveryPage(this.value);"> 
          <c:forEach var="pageCount" begin="5" end="${page.totalCount}" step="5">             
            <option value="${pageCount}" ${page.everyPage eq pageCount ? "selected" : ""}> 
              ${pageCount}條 
            </option> 
          </c:forEach> 
        </select> 
  </td> 
</tr> 
<div style=&#39;display: none&#39;> 
  <a class=listlink id="indexPageHref" href=&#39;#&#39;></a> 
</div> 
<script> 
function getCurrentPage(index){  
  var a = document.getElementById("indexPageHref");   
  a.href = &#39;${pathurl}&pageAction=gopage&pageKey=&#39;+index+&#39;${urlParams}&#39;;     
  a.setAttribute("onclick",&#39;&#39;);      
  a.click("return false");   
} 
function setEveryPage(everyPage){   
  var a = document.getElementById("indexPageHref"); 
  var currentPage = document.getElementById(&#39;indexChange&#39;).value; 
  a.href = &#39;${pathurl}&pageAction=setpage&pageKey=&#39;+everyPage+&#39;${urlParams}&#39;;     
  a.setAttribute("onclick",&#39;&#39;);      
  a.click("return false");   
} 
function sortPage(sortName){   
  var a = document.getElementById("indexPageHref");   
  a.href = &#39;${pathurl}&pageAction=sort&pageKey=&#39;+sortName+&#39;${urlParams}&#39;;    
  a.setAttribute("onclick",&#39;&#39;);    
  a.click("return false");   
} 
</script>

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