mybatis分页效果实现代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://www.springframework.org/schema/beans"
  xmlns:p="http://www.springframework.org/schema/p"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<!-- 自动扫描加载注解的包 -->
<context:component-scan base-package="com.ij34.bean"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
<property name="prefix" value="/WEB-INF/view/"></property>
<property name="suffix" value=".jsp" ></property>
</bean>

</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.3.xsd"
   default-autowire="byName" default-lazy-init="false"> 
 <!-- Showcase's CustomFreemarkerManager example -->
 <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
  <property name="driverClassName" value="com.mysql.jdbc.Driver"></property> 
  <property name="url" value="jdbc:mysql://localhost:3306/mybatis"></property> 
  <property name="username" value="root"></property> 
  <property name="password" value="123456"></property> 
 </bean> 
 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSource" />
 </bean>
 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource"></property>
  <property name="configLocation" value="classpath:com/ij34/mybatis/mybatis-config.xml"></property>
  <property name="mapperLocations" value="classpath:com/ij34/mybatis/UserMapper.xml"></property>
 </bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
 <property name="basePackage" value="com.ij34.model"></property>
 <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
</bean>
</beans>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<typeAlias type="com.ij34.model.Article" alias="Article"/>
<typeAlias type="com.ij34.model.User" alias="User"/>
<typeAlias type="com.ij34.pages.PageInfo" alias="PageInfo"/>
</typeAliases>
 <plugins>
  <plugin interceptor="com.ij34.pages.PagePlugin">
   <property name="dialect" value="mysql" />
   <property name="pageSqlId" value=".*ListPage.*" />
  </plugin>
 </plugins>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

 <mapper namespace="com.ij34.model.UserMapper">
<resultMap type="Article" id="resultAticleList">
 <id property="id" column="aid"/>
 <result property="title" column="title"/>
 <result property="content" column="content"/>
 <association property="user" javaType="User">
 <id property="id" column="id"/>
 <result property="name" column="name"/>
 <result property="age" column="age"/>
 </association>
 </resultMap>
 <select id="selectarticle" parameterType="int" resultMap="resultAticleList">
 select users.id,users.name,users.age,article.id aid,article.title,article.content from users,article
 where users.id=article.userid and users.id=#{id}
 </select>
 
 <select id="ListPage" resultMap="resultAticleList">
 select users.id,users.name,users.age,article.id aid,article.title,article.content from users,article
 where users.id=article.userid and users.id=#{userid}
 </select>
 
 </mapper>

package com.ij34.model;

public class User {
 private int id;
 private String name;
 private int age;


 public int getId() {
 return id;
}

public void setId(int id) {
 this.id = id;
}

public String getName() {
 return name;
}

public void setName(String name) {
 this.name = name;
}

public int getAge() {
 return age;
}

public void setAge(int age) {
 this.age = age;
}
public String toString() {
 return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}


}

package com.ij34.model;

public class Article {
 private int id;
 private User user;
 private String title;
 private String content;
 
public String getContent() {
 return content;
}
public void setContent(String content) {
 this.content = content;
}
public int getId() {
 return id;
}
public void setId(int id) {
 this.id = id;
}
public User getUser() {
 return user;
}
public void setUser(User user) {
 this.user = user;
}
public String getTitle() {
 return title;
}
public void setTitle(String title) {
 this.title = title;
}

 
}

package com.ij34.model;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.ij34.pages.PageInfo;

public interface UserMapper {
  
 public List<Article> selectarticle(int id); 
 public List<Article> ListPage(@Param("page") PageInfo page,@Param("userid") int userid);
}

package com.ij34.pages;

import java.io.Serializable;

public class PageInfo implements Serializable {

 private static final long serialVersionUID = 587754556498974978L;
 
 //pagesize ，每一页显示多少
 private int showCount = 9;
 //总页数
 private int totalPage;
 //总记录数
 private int totalResult;
 //当前页数
 private int currentPage;
 //当前显示到的ID, 在mysql limit 中就是第一个参数.
 private int currentResult;
 private String sortField;
 private String order;
 
 
 public int getShowCount() {
  return showCount;
 }
 public void setShowCount(int showCount) {
  this.showCount = showCount;
 }
 public int getTotalPage() {
  return totalPage;
 }
 public void setTotalPage(int totalPage) {
  this.totalPage = totalPage;
 }
 public int getTotalResult() {
  return totalResult;
 }
 public void setTotalResult(int totalResult) {
  this.totalResult = totalResult;
 }
 public int getCurrentPage() {
  return currentPage;
 }
 public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
 }
 public int getCurrentResult() {
  return currentResult;
 }
 public void setCurrentResult(int currentResult) {
  this.currentResult = currentResult;
 }
 public String getSortField() {
  return sortField;
 }
 public void setSortField(String sortField) {
  this.sortField = sortField;
 }
 public String getOrder() {
  return order;
 }
 public void setOrder(String order) {
  this.order = order;
 }
 
 
}

package com.ij34.pages;

import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import javax.xml.bind.PropertyException;

import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.ExecutorException;
import org.apache.ibatis.executor.statement.BaseStatementHandler;
import org.apache.ibatis.executor.statement.RoutingStatementHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
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.MetaObject;
import org.apache.ibatis.reflection.property.PropertyTokenizer;
import org.apache.ibatis.scripting.xmltags.ForEachSqlNode;
import org.apache.ibatis.session.Configuration;

import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;

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

 private static String dialect = "";
 private static String pageSqlId = "";

 @SuppressWarnings("unchecked")
 public Object intercept(Invocation ivk) throws Throwable {

  if (ivk.getTarget() instanceof RoutingStatementHandler) {
   RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk
     .getTarget();
   BaseStatementHandler delegate = (BaseStatementHandler) ReflectHelper
     .getValueByFieldName(statementHandler, "delegate");
   MappedStatement mappedStatement = (MappedStatement) ReflectHelper
     .getValueByFieldName(delegate, "mappedStatement");

   if (mappedStatement.getId().matches(pageSqlId)) {
    BoundSql boundSql = delegate.getBoundSql();
    Object parameterObject = boundSql.getParameterObject();
    if (parameterObject == null) {
     throw new NullPointerException("parameterObject error");
    } else {
     Connection connection = (Connection) ivk.getArgs()[0];
     String sql = boundSql.getSql();
     String countSql = "select count(0) from (" + sql + ") myCount";
     System.out.println("总数sql 语句:"+countSql);
     PreparedStatement countStmt = connection
       .prepareStatement(countSql);
     BoundSql countBS = new BoundSql(
       mappedStatement.getConfiguration(), countSql,
       boundSql.getParameterMappings(), parameterObject);
     setParameters(countStmt, mappedStatement, countBS,
       parameterObject);
     ResultSet rs = countStmt.executeQuery();
     int count = 0;
     if (rs.next()) {
      count = rs.getInt(1);
     }
     rs.close();
     countStmt.close();

     PageInfo page = null;
     if (parameterObject instanceof PageInfo) {
      page = (PageInfo) parameterObject;
      page.setTotalResult(count);
     } else if(parameterObject instanceof Map){
      Map<String, Object> map = (Map<String, Object>)parameterObject;
      page = (PageInfo)map.get("page");
      if(page == null)
       page = new PageInfo();
      page.setTotalResult(count);
     }else {
      Field pageField = ReflectHelper.getFieldByFieldName(
        parameterObject, "page");
      if (pageField != null) {
       page = (PageInfo) ReflectHelper.getValueByFieldName(
         parameterObject, "page");
       if (page == null)
        page = new PageInfo();
       page.setTotalResult(count);
       ReflectHelper.setValueByFieldName(parameterObject,
         "page", page);
      } else {
       throw new NoSuchFieldException(parameterObject
         .getClass().getName());
      }
     }
     String pageSql = generatePageSql(sql, page);
     System.out.println("page sql:"+pageSql);
     ReflectHelper.setValueByFieldName(boundSql, "sql", pageSql);
    }
   }
  }
  return ivk.proceed();
 }

 private void setParameters(PreparedStatement ps,
   MappedStatement mappedStatement, BoundSql boundSql,
   Object parameterObject) throws SQLException {
  ErrorContext.instance().activity("setting parameters")
    .object(mappedStatement.getParameterMap().getId());
  List<ParameterMapping> parameterMappings = boundSql
    .getParameterMappings();
  if (parameterMappings != null) {
   Configuration configuration = mappedStatement.getConfiguration();
   TypeHandlerRegistry typeHandlerRegistry = configuration
     .getTypeHandlerRegistry();
   MetaObject metaObject = parameterObject == null ? null
     : configuration.newMetaObject(parameterObject);
   for (int i = 0; i < parameterMappings.size(); i++) {
    ParameterMapping parameterMapping = parameterMappings.get(i);
    if (parameterMapping.getMode() != ParameterMode.OUT) {
     Object value;
     String propertyName = parameterMapping.getProperty();
     PropertyTokenizer prop = new PropertyTokenizer(propertyName);
     if (parameterObject == null) {
      value = null;
     } else if (typeHandlerRegistry
       .hasTypeHandler(parameterObject.getClass())) {
      value = parameterObject;
     } else if (boundSql.hasAdditionalParameter(propertyName)) {
      value = boundSql.getAdditionalParameter(propertyName);
     } else if (propertyName
       .startsWith(ForEachSqlNode.ITEM_PREFIX)
       && boundSql.hasAdditionalParameter(prop.getName())) {
      value = boundSql.getAdditionalParameter(prop.getName());
      if (value != null) {
       value = configuration.newMetaObject(value)
         .getValue(
           propertyName.substring(prop
             .getName().length()));
      }
     } else {
      value = metaObject == null ? null : metaObject
        .getValue(propertyName);
     }
     TypeHandler typeHandler = parameterMapping.getTypeHandler();
     if (typeHandler == null) {
      throw new ExecutorException(
        "There was no TypeHandler found for parameter "
          + propertyName + " of statement "
          + mappedStatement.getId());
     }
     typeHandler.setParameter(ps, i + 1, value,
       parameterMapping.getJdbcType());
    }
   }
  }
 }


 private String generatePageSql(String sql, PageInfo page) {
  if (page != null && (dialect !=null || !dialect.equals(""))) {
   StringBuffer pageSql = new StringBuffer();
   if ("mysql".equals(dialect)) {
    pageSql.append(sql);
    pageSql.append(" limit " + page.getCurrentResult() + ","
      + page.getShowCount());
   } else if ("oracle".equals(dialect)) {
    pageSql.append("select * from (select tmp_tb.*,ROWNUM row_id from (");
    pageSql.append(sql);
    pageSql.append(") tmp_tb where ROWNUM<=");
    pageSql.append(page.getCurrentResult() + page.getShowCount());
    pageSql.append(") where row_id>");
    pageSql.append(page.getCurrentResult());
   }
   return pageSql.toString();
  } else {
   return sql;
  }
 }

 public Object plugin(Object arg0) {
  // TODO Auto-generated method stub
  return Plugin.wrap(arg0, this);
 }

 public void setProperties(Properties p) {
  dialect = p.getProperty("dialect");
  if (dialect ==null || dialect.equals("")) {
   try {
    throw new PropertyException("dialect property is not found!");
   } catch (PropertyException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  pageSqlId = p.getProperty("pageSqlId");
  if (dialect ==null || dialect.equals("")) {
   try {
    throw new PropertyException("pageSqlId property is not found!");
   } catch (PropertyException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
 }


}

package com.ij34.pages;

import java.lang.reflect.Field;


public class ReflectHelper {
 public static Field getFieldByFieldName(Object obj, String fieldName) { 
  for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass 
    .getSuperclass()) { 
   try { 
    return superClass.getDeclaredField(fieldName); 
   } catch (NoSuchFieldException e) { 
   } 
  } 
  return null; 
 } 
 

 public static Object getValueByFieldName(Object obj, String fieldName) 
   throws SecurityException, NoSuchFieldException, 
   IllegalArgumentException, IllegalAccessException { 
  Field field = getFieldByFieldName(obj, fieldName); 
  Object value = null; 
  if(field!=null){ 
   if (field.isAccessible()) { 
    value = field.get(obj); 
   } else { 
    field.setAccessible(true); 
    value = field.get(obj); 
    field.setAccessible(false); 
   } 
  } 
  return value; 
 } 
 
 
 public static void setValueByFieldName(Object obj, String fieldName, 
   Object value) throws SecurityException, NoSuchFieldException, 
   IllegalArgumentException, IllegalAccessException { 
  Field field = obj.getClass().getDeclaredField(fieldName); 
  if (field.isAccessible()) { 
   field.set(obj, value); 
  } else { 
   field.setAccessible(true); 
   field.set(obj, value); 
   field.setAccessible(false); 
  } 
 } 

}

package com.ij34.bean;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.ij34.model.*;
import com.ij34.pages.PageInfo;

@Controller
@RequestMapping("/article")
public class Test {
 @Autowired
 UserMapper mapper;

 @RequestMapping("/list")
 public ModelAndView listall(HttpServletRequest request,HttpServletResponse response){
  List<Article> articles=mapper.selectarticle(1);
  //制定视图，也就是list.jsp
  ModelAndView mav=new ModelAndView("list");
  mav.addObject("articles",articles);
  return mav;
 }
 

 @RequestMapping("/pagelist")
 public ModelAndView pageList(HttpServletRequest request,HttpServletResponse response){
  int currentPage = request.getParameter("page")==null?1:Integer.parseInt(request.getParameter("page"));
  int pageSize = 9;
  if (currentPage<=1){
   currentPage =1;
  }
  int currentResult = (currentPage-1) * pageSize;
  
  System.out.println(request.getRequestURI());
  System.out.println(request.getQueryString());
  
  PageInfo page = new PageInfo();
  page.setShowCount(pageSize);
  page.setCurrentResult(currentResult);
  List<Article> articles=mapper.ListPage(page,1);
  
  System.out.println(page);
  
  int totalCount = page.getTotalResult();
  
  int lastPage=0;
  if (totalCount % pageSize==0){
   lastPage = totalCount % pageSize;
  }
  else{
   lastPage =1+ totalCount / pageSize;
  }
  
  if (currentPage>=lastPage){
   currentPage =lastPage;
  }
  
  String pageStr = "";
  pageStr=String.format("<a href=\"%s\">上一页</a>    <a href=\"%s\">下一页</a>",
      request.getRequestURI()+"?page="+(currentPage-1),request.getRequestURI()+"?page="+(currentPage+1) );

  //制定视图，也就是list.jsp
  ModelAndView mav=new ModelAndView("list");
  mav.addObject("articles",articles);
  mav.addObject("pageStr",pageStr);
  return mav;
 }
/* public ModelAndView show(){//@RequestParam 请求参数 
  List<Article> articles=mapper.selectarticle(1);
  ModelAndView mav=new ModelAndView("list");
  mav.addObject("articles", articles);
 return mav;
 
 }*/
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 <display-name>mybatis_springmvc</display-name>
 <welcome-file-list>
 <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <context-param>
 <param-name>contextConfigLocation</param-name>
 <param-value>classpath:com/ij34/mybatis/applicationContext.xml</param-value>
 </context-param>
 <listener>
 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <listener>
 <listener-class>
   org.springframework.web.context.ContextCleanupListener</listener-class>
 </listener>
 <servlet>
 <servlet-name>springDispatcherServlet</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:spring-mvc.xml</param-value>
 </init-param>
 </servlet>
 <servlet-mapping>
 <servlet-name>springDispatcherServlet</servlet-name>
 <url-pattern>/</url-pattern>
 </servlet-mapping>
 <filter>
 <filter-name>characterEncodingfilter</filter-name>
 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
 <init-param>
  <param-name>encoding</param-name>
  <param-value>utf8</param-value>
 </init-param>
 <init-param>
  <param-name>forceEncoding</param-name>
  <param-value>true</param-value>
 </init-param>
 </filter>
 <filter-mapping>
 <filter-name>characterEncodingfilter</filter-name>
 <url-pattern>*</url-pattern>
 </filter-mapping>
</web-app>

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
 <a href="article/list" rel="external nofollow" >不分页测试</a><br /><p />
 <a href="article/pagelist" rel="external nofollow" >分页测试</a>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<table>
<c:forEach var="article" items="${articles}">
<tr><td>${article.id} |</td><td> ${article.title}|</td><td> ${article.content}|</td><td>${article.user}</td> </tr> 
</c:forEach>
</table>
<h4>${pageStr}</h4>
</body>
</html>