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>