SSM+PageHelper实现分页

其他 2019-09-01 10:58:18 阅读次数: 0

 参考地址：https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md

一、环境准备工程搭建

环境：IDEA、JDK1.8、MAVEN

 注意：

由于IDEA与Eclipse文件解析不同

所以xml配置文件在resources文件中的位置与在java包的位置一致

 

二、整合Spring + MyBatis

pom.xml

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.4</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.2.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
    </dependencies>

　　

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>pagehelper</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

　　

applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                     http://www.springframework.org/schema/beans/spring-beans.xsd
                     http://www.springframework.org/schema/tx
                     http://www.springframework.org/schema/tx/spring-tx.xsd
                     http://www.springframework.org/schema/aop
                     http://www.springframework.org/schema/aop/spring-aop.xsd
                     http://www.springframework.org/schema/context
                     http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 扫描注解的包 -->
    <context:component-scan base-package="com.mrchengs"/>
    <!-- 配置数据库 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 加载配置文件 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!-- 配置sqlSessionFactory, 并将数据源注入 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 引入数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!--载入mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"/>
        <!--载入配置mapper映射的xml-->
        <!--<property name="mapperLocations" value="classpath:com/mrchengs/mapper/*.xml"/>-->

        <property name="typeAliasesPackage" value="com.mrchengs"/>
    </bean>

    <!--配置mapperFactory -->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="com.mrchengs.mapper.UserMapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>
</beans>

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3307/shijian
jdbc.username=root
jdbc.password=1234567890

log4j.properties

#Global logging configuration
# 在开发环境下日志级别要设成
log4j.rootLogger = DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%5p [%t] - %m%n

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- 扫描注解的包 -->
    <context:component-scan base-package="com.mrchengs.controller"/>
    <!-- 开启注解 -->
    <mvc:annotation-driven/>
    <!--静态资源访问-->
    <mvc:default-servlet-handler/>

    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

Mybatis的配置文件

SqlMapConfig.xml

引入 pageHelper插件 
注意这里要写成PageInterceptor, 5.0之前的版本都是写PageHelper, 5.0之后要换成PageInterceptor
<?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>
    
    <!--分页 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--reasonable：分页合理化参数，默认值为false。
                当该参数设置为 true 时，pageNum<=0 时会查询第一页，
                pageNum>pages（超过总数时），会查询最后一页。
                默认false 时，直接根据参数进行查询。-->
            <property name="reasonable" value="true"/>
        </plugin>
    </plugins>


    <!-- 加载 映射文件 -->
    <mappers>
       <package name="com.mrchengs.mapper"/>
    </mappers>
</configuration>

UserMapper.java

package com.mrchengs.mapper;

import com.mrchengs.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;
@Mapper
public interface UserMapper {

    public List<User>  allUser() throws  Exception;
}

UserMapper.xml

<?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.mrchengs.mapper.UserMapper">
    <select id="getAllUser"  resultType="com.mrchengs.User">
           SELECT * FROM USERS
     </select>

    <select id="allUser" resultType="com.mrchengs.User">
        select  * from  users
    </select>
</mapper>

User.java

package com.mrchengs;

public class User {

    private String user;
    private  Integer password;

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public Integer getPassword() {
        return password;
    }

    public void setPassword(Integer password) {
        this.password = password;
    }
}

pageHelperController.java

package com.mrchengs.controller;



import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.mrchengs.User;

import com.mrchengs.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;


import java.util.List;

@Controller
public class pageHelperCOntroller {

    @Autowired
    UserMapper userMapper ;



    @RequestMapping("/test")
    public String  test(ModelMap request,
           @RequestParam(defaultValue="1",required=true,value="pageNo") Integer pageNo) throws Exception {//每页显示的数量
        Integer pageSize = 4;
        //分页查询
        PageHelper.startPage(pageNo, pageSize);
　　　　　//进行查询数据
        List<User> userList = userMapper.allUser();
        PageInfo<User> pageInfo = new PageInfo<>(userList);
        request.addAttribute("pageInfo",pageInfo);

        return  "test";
    }
}

三、页面显示的jsp

index.jps

<html>
<body>
<h2>Hello World!</h2>
</body>

<a href="<%=request.getContextPath()%>/test">test</a>
</html>

test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><html>
<head>
    <title>Title</title>
</head>
<body>
<center>
    <table width="200" border="1">
        <tr>
            <th scope="col">name</th>
            <th scope="col">age</th>
        </tr>
        <c:forEach items="${pageInfo.list}" var="user">
            <tr>
                <td>${user.user}</td>
                <td>${user.password}</td>
            </tr>
        </c:forEach>
    </table>
    <p>当前 ${pageInfo.pageNum }页,总${pageInfo.pages }
        页,总 ${pageInfo.total } 条记录</div></p>
    <a href="test?pageNo=${pageInfo.firstPage}">第一页</a>


    <c:if test="${pageInfo.hasPreviousPage }">
        <a href="test?pageNo=${pageInfo.pageNum-1}">上一页</a>
    </c:if>

    <c:if test="${pageInfo.hasNextPage }">
        <a href="test?pageNo=${pageInfo.pageNum+1}">下一页</a>
    </c:if>

    <a href="test?pageNo=${pageInfo.lastPage}">最后页</a>
</center>
</body>
</html>

四、测试

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