/**
 * 分頁(yè)對(duì)應(yīng)的實(shí)體類(lèi)
 */
public class Page {
  /**
   * 總條數(shù)
   */
  private int totalNumber;
  /**
   * 當(dāng)前第幾頁(yè)
   */
  private int currentPage;
  /**
   * 總頁(yè)數(shù)
   */
  private int totalPage;
  /**
   * 每頁(yè)顯示條數(shù)
   */
  private int pageNumber = 5;
  /**
   * 數(shù)據(jù)庫(kù)中l(wèi)imit的參數(shù)，從第幾條開(kāi)始取
   */
  private int dbIndex;
  /**
   * 數(shù)據(jù)庫(kù)中l(wèi)imit的參數(shù)，一共取多少條
   */
  private int dbNumber;

  /**
   * 根據(jù)當(dāng)前對(duì)象中屬性值計(jì)算并設(shè)置相關(guān)屬性值
   */
  public void count() {
    // 計(jì)算總頁(yè)數(shù)
    int totalPageTemp = this.totalNumber / this.pageNumber;
    int plus = (this.totalNumber % this.pageNumber) == 0 ? 0 : 1;
    totalPageTemp = totalPageTemp + plus;
    if(totalPageTemp <= 0) {
      totalPageTemp = 1;
    }
    this.totalPage = totalPageTemp;

    // 設(shè)置當(dāng)前頁(yè)數(shù)
    // 總頁(yè)數(shù)小于當(dāng)前頁(yè)數(shù)，應(yīng)將當(dāng)前頁(yè)數(shù)設(shè)置為總頁(yè)數(shù)
    if(this.totalPage < this.currentPage) {
      this.currentPage = this.totalPage;
    }
    // 當(dāng)前頁(yè)數(shù)小于1設(shè)置為1
    if(this.currentPage < 1) {
      this.currentPage = 1;
    }

    // 設(shè)置limit的參數(shù)
    this.dbIndex = (this.currentPage - 1) * this.pageNumber;
    this.dbNumber = this.pageNumber;
  }

  public int getTotalNumber() {
    return totalNumber;
  }

  public void setTotalNumber(int totalNumber) {
    this.totalNumber = totalNumber;
    this.count();
  }

  public int getCurrentPage() {
    return currentPage;
  }

  public void setCurrentPage(int currentPage) {
    this.currentPage = currentPage;
  }

  public int getTotalPage() {
    return totalPage;
  }

  public void setTotalPage(int totalPage) {
    this.totalPage = totalPage;
  }

  public int getPageNumber() {
    return pageNumber;
  }

  public void setPageNumber(int pageNumber) {
    this.pageNumber = pageNumber;
    this.count();
  }

  public int getDbIndex() {
    return dbIndex;
  }

  public void setDbIndex(int dbIndex) {
    this.dbIndex = dbIndex;
  }

  public int getDbNumber() {
    return dbNumber;
  }

  public void setDbNumber(int dbNumber) {
    this.dbNumber = dbNumber;
  }
}

package com.imooc.interceptor;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Map;
import java.util.Properties;

import org.apache.ibatis.executor.parameter.ParameterHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.DefaultReflectorFactory;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;

import com.imooc.entity.Page;

/**
 * 分頁(yè)攔截器
 * 
 * @author Skye
 *
 */
@Intercepts({
    @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class, Integer.class }) })
public class PageInterceptor implements Interceptor {

  public Object intercept(Invocation invocation) throws Throwable {
    StatementHandler statementHandler = (StatementHandler) invocation.getTarget();
    MetaObject metaObject = MetaObject.forObject(statementHandler, SystemMetaObject.DEFAULT_OBJECT_FACTORY,
        SystemMetaObject.DEFAULT_OBJECT_WRAPPER_FACTORY, new DefaultReflectorFactory());
    MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");
    //通過(guò)MetaObject元數(shù)據(jù)取得方法名id：com.XXX.queryMessageListByPage
    String id = mappedStatement.getId();
    //匹配在mybatis中定義的與分頁(yè)有關(guān)的查詢(xún)id
    if (id.matches(".+ByPage$")) {
      //BoundSql中有原始的sql語(yǔ)句和對(duì)應(yīng)的查詢(xún)參數(shù)
      BoundSql boundSql = statementHandler.getBoundSql();
      Map<String, Object> params = (Map<String, Object>) boundSql.getParameterObject();
      Page page = (Page) params.get("page");
      String sql = boundSql.getSql();
      String countSql = "select count(*)from (" + sql + ")a";
      Connection connection = (Connection) invocation.getArgs()[0];
      PreparedStatement countStatement = connection.prepareStatement(countSql);
      ParameterHandler parameterHandler = (ParameterHandler) metaObject.getValue("delegate.parameterHandler");
      parameterHandler.setParameters(countStatement);
      ResultSet rs = countStatement.executeQuery();
      if (rs.next()) {
        //為什么是getInt（1）? 因?yàn)閿?shù)據(jù)表的列是從1開(kāi)始計(jì)數(shù)
        page.setTotalNumber(rs.getInt(1));
        System.out.println("攔截器得知page的記錄總數(shù)為：" + page.getTotalNumber());
      }
      String pageSql = sql + " limit " + page.getDbIndex() + "," + page.getDbNumber();
      metaObject.setValue("delegate.boundSql.sql", pageSql);
    }
    return invocation.proceed();
  }

  /**
   * @param target
   * 被攔截的對(duì)象
   */
  public Object plugin(Object target) {
    // 如果將攔截器類(lèi)比喻為代購(gòu)票的公司，那this就是代購(gòu)業(yè)務(wù)員（進(jìn)入方法前是無(wú)代理購(gòu)票能力業(yè)務(wù)員，進(jìn)入后成為有代理能力的業(yè)務(wù)員）
    // 通過(guò)注解獲取攔截目標(biāo)的信息，如果不符合攔截要求就返回原目標(biāo)，如果符合則使用動(dòng)態(tài)代理生成代理對(duì)象
    return Plugin.wrap(target, this);
  }

  public void setProperties(Properties properties) {
    // TODO Auto-generated method stub

  }

}

 <!-- 自定義的分頁(yè)攔截器 -->
  <plugins>
    <plugin interceptor="你寫(xiě)的攔截器全類(lèi)名">
    </plugin>
  </plugins>

<!--pagination需要的腳本-->
<%
  // 獲取請(qǐng)求的上下文
  String context = request.getContextPath();
%>
<link href="../css/pagination.css" rel="external nofollow" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="../js/jquery-1.11.3.js"></script>
<script type="text/javascript" src="../js/jquery.pagination.js"></script>
<script type="text/javascript">

// 點(diǎn)擊分頁(yè)按鈕以后觸發(fā)的動(dòng)作
function handlePaginationClick(new_page_index, pagination_container) {
<!--從stuForm表單提交當(dāng)前頁(yè)的參數(shù).可以使用restful方式，讓springmvc使用@PathVariable關(guān)鍵字定義的形參去接。這2個(gè)參數(shù)是分頁(yè)控件自己提供的，不需要我們?nèi)プ约赫?，但是?jì)數(shù)從0開(kāi)始，而我們后臺(tái)分頁(yè)計(jì)數(shù)從1開(kāi)始，因此要手動(dòng)加1。 -->
  $("#stuForm").attr("action", "你定義的分頁(yè)查詢(xún)url/"+(new_page_index+1));
  $("#stuForm").submit();
  return false;
}

$(function(){
  $("#News-Pagination").pagination(${result.totalRecord}, {
    items_per_page:${result.pageSize}, // 每頁(yè)顯示多少條記錄
    current_page:${result.currentPage} - 1, // 當(dāng)前顯示第幾頁(yè)數(shù)據(jù)
    num_display_entries:8, // 分頁(yè)顯示的條目數(shù)
    next_text:"下一頁(yè)",
    prev_text:"上一頁(yè)",
    num_edge_entries:2, // 連接分頁(yè)主體，顯示的條目數(shù)
    callback:handlePaginationClick(當(dāng)前頁(yè)，分頁(yè)div的id), //執(zhí)行的回調(diào)函數(shù)
    load_first_page:false //防止頁(yè)面一直刷新( 這條非常重要！)
  });
});
</script>
<!-- 這部分用c:forEach標(biāo)簽打印查詢(xún)結(jié)果的表格-->
<!--分頁(yè)控件名稱(chēng)-->
<div id="News-Pagination"></div>