JAVA MyBybatis分页

java：

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
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 org.imooc.bean.BaseBean;
import org.imooc.bean.Page;

@Intercepts({@Signature(type=StatementHandler.class,method="prepare",args={Connection.class})})
public class PageInterceptor implements Interceptor{

  public Object intercept(Invocation arg0) throws Throwable {
    StatementHandler statementHandler = (StatementHandler)arg0.getTarget();
    MetaObject metaObject = MetaObject.forObject(statementHandler, SystemMetaObject.DEFAULT_OBJECT_FACTORY, SystemMetaObject.DEFAULT_OBJECT_WRAPPER_FACTORY,new DefaultReflectorFactory());
    MappedStatement mappedStatement = (MappedStatement)metaObject.getValue("delegate.mappedStatement");
    String id = mappedStatement.getId();
    if(id.endsWith("ByPage")) {
      BoundSql boundSql = statementHandler.getBoundSql();
      String sql = boundSql.getSql();
      String countSql = "select count(*) from(" + sql + ")t";
      Connection conn = (Connection)arg0.getArgs()[0];
      PreparedStatement statement = conn.prepareStatement(countSql);
      ParameterHandler parameterHandler = (ParameterHandler)metaObject.getValue("delegate.parameterHandler");
      parameterHandler.setParameters(statement);
      ResultSet rs = statement.executeQuery();
      BaseBean bean = (BaseBean)boundSql.getParameterObject();
      Page page = bean.getPage();
      if(rs.next()) {
        page.setTotalNumber(rs.getInt(1));
      }
      String pageSql = sql + " limit " + (page.getCurrentPage() - 1) * page.getPageNumber() + "," + page.getPageNumber();
      metaObject.setValue("delegate.boundSql.sql", pageSql);
    }
    return arg0.proceed();
  }

  public Object plugin(Object arg0) {
    return Plugin.wrap(arg0, this);
  }

  public void setProperties(Properties arg0) {
    
  }
}

/**
 * 分页对象
 */
public class Page {
  
  // 总条数
  private int totalNumber;
  // 当前页数
  private int currentPage;
  // 总页数
  private int totalPage;
  // 每页显示条数
  private int pageNumber;
  
  public Page() {
      this.currentPage = 1;
      this.pageNumber = 5;
  }

  public int getTotalNumber() {
    return totalNumber;
  }
  
  private void count() {
    this.totalPage = this.totalNumber / this.pageNumber;
    if(this.totalNumber % this.pageNumber > 0) {
      this.totalPage++;
    }
    if(this.totalPage <= 0) {
      this.totalPage = 1;
    }
    if(this.currentPage > this.totalPage) {
      this.currentPage = this.totalPage;
    }
    if(this.currentPage <= 0) {
      this.currentPage = 1;
    }
  }
  
  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;
  }
}

public class BaseBean {
  
  private Page page;
  
  public BaseBean() {
      this.page = new Page();
  }
  
  public Page getPage() {
    return page;
  }
  public void setPage(Page page) {
    this.page = page;
  }
}

　　jsp页面：

<%@ tag language="java" pageEncoding="UTF-8" %>
<%@ attribute type="org.imooc.bean.Page" name="page" required="true" %>
<%@ attribute type="String" name="jsMethodName" required="true" %>

<script type="text/javascript">
  function transCurrentPage(currentPage) {
    var rule = /^[0-9]*[1-9][0-9]*$/;
    if(!rule.test(currentPage)) {
      currentPage = 1;
    }
    eval("${jsMethodName}(currentPage)");
  }
</script>

<div class="page fix">
  <a href="javascript:transCurrentPage('1');" class="first">首页</a>
  <a href="javascript:transCurrentPage('${page.currentPage - 1}');" class="pre">上一页</a>
  当前第<span>${page.currentPage}/${page.totalPage}</span>页
  <a href="javascript:transCurrentPage('${page.currentPage + 1}');" class="next">下一页</a>
  <a href="javascript:transCurrentPage('${page.totalPage}');" class="last">末页</a>
  跳至  <input id="currentPageText" value="1" class="allInput w28" type="text"/> 页  
  <a href="javascript:transCurrentPage($('#currentPageText').val());" class="go">GO</a>
</div>

　　调用：

<%@ taglib prefix="t" tagdir="/WEB-INF/tags"%>
<!-- 分页 -->
<t:page jsMethodName="search" page="${searchParam.page}"></t:page>