Spring Boot+Mybatis+Pagehelper分页

Spring Boot 集成MyBatis和Pagehelper分页插件

mybatis-spring-boot-starter依赖树如下：

pom配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xiaolyuh</groupId>

    <artifactId>spring-boot-student-mybatis</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>spring-boot-student-mybatis</name>


<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">&lt;!-- 添加Spring Boot的父类依赖，这样当前项目就是Spring Boot项目了。 spring-boot-starter-parent是一个特殊的starter，他用来
    提供相关的maven默认依赖， 使用它之后，常用的依赖可以省去version标签 --&gt;</span></br>
<span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">parent</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>spring-boot-starter-parent<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">version</span>&gt;</span>1.5.3.RELEASE<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">version</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">relativePath</span>/&gt;</span> <span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">&lt;!-- lookup parent from repository --&gt;</span></br>
<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">parent</span>&gt;</span></br></br>

<span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">properties</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">project.build.sourceEncoding</span>&gt;</span>UTF-8<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">project.build.sourceEncoding</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">project.reporting.outputEncoding</span>&gt;</span>UTF-8<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">project.reporting.outputEncoding</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">java.version</span>&gt;</span>1.8<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">java.version</span>&gt;</span></br>
<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">properties</span>&gt;</span></br></br>

<span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependencies</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>spring-boot-starter<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>spring-boot-starter-web<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>mysql<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>mysql-connector-java<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br></br>

    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.mybatis.spring.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>mybatis-spring-boot-starter<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">version</span>&gt;</span>1.3.0<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">version</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br>
    <span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">&lt;!--pagehelper --&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>com.github.pagehelper<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>pagehelper-spring-boot-starter<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">version</span>&gt;</span>1.1.1<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">version</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br></br>

    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>com.alibaba<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>fastjson<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">version</span>&gt;</span>1.2.31<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">version</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br></br>

    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">dependency</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>spring-boot-starter-test<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">scope</span>&gt;</span>test<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">scope</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependency</span>&gt;</span></br>
<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">dependencies</span>&gt;</span></br></br>

<span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">build</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">plugins</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">plugin</span>&gt;</span></br>
            <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">groupId</span>&gt;</span></br>
            <span class="hljs-tag" style="color:navy">&lt;<span class="hljs-title" style="">artifactId</span>&gt;</span>spring-boot-maven-plugin<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">artifactId</span>&gt;</span></br>
        <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">plugin</span>&gt;</span></br>
    <span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">plugins</span>&gt;</span></br>
<span class="hljs-tag" style="color:navy">&lt;/<span class="hljs-title" style="">build</span>&gt;</span></br></br>

</project>

application.properties配置

server.port=80
# 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/ssb_test
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.username=root

spring.datasource.password=root

#连接池配置

#spring.datasource.type=org.apache.commons.dbcp2.BasicDataSource


#mybatis


#entity扫描的包名


mybatis.type-aliases-package=com.xiaolyuh.domain.model


#Mapper.xml所在的位置


mybatis.mapper-locations=classpath:/mybaits/Mapper.xml


#pagehelper分页插件配置


pagehelper.helperDialect=mysql


pagehelper.reasonable=true


pagehelper.supportMethodsArguments=true


pagehelper.params=count=countSql


#日志配置


logging.level.com.xiaolyuh=debug


logging.level.org.springframework.web=debug


logging.level.org.springframework.transaction=debug


logging.level.org.mybatis=debug



debug=false

除了上面常见的两项配置，还有：

mybatis.config-location=mybatis-config.xml配置文件的路径

mybatis.type-handlers-package=扫描typeHandlers的包

mybatis.check-config-location=检查配置文件是否存在

mybatis.executor-type=设置执行模式（SIMPLE, REUSE, BATCH），默认为SIMPLE

Mapping XML文件

在resources文件夹下创建mybaits/PersonMapper.xml文件

<?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.xiaolyuh.domain.mapper.PersonMapper" >

  <resultMap id="BaseResultMap" type="com.xiaolyuh.domain.model.Person" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    <id column="id" property="id" jdbcType="BIGINT" />

    <result column="name" property="name" jdbcType="VARCHAR" />

    <result column="age" property="age" jdbcType="INTEGER" />

    <result column="address" property="address" jdbcType="VARCHAR" />

  </resultMap>

  <sql id="Base_Column_List" >
    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    id, name, age, address
  </sql>

  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    select 

    <include refid="Base_Column_List" />

    from person

    where id = #{id,jdbcType=BIGINT}

  </select>

  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    delete from person

    where id = #{id,jdbcType=BIGINT}

  </delete>

  <insert id="insert" parameterType="com.xiaolyuh.domain.model.Person" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" >

      SELECT LAST_INSERT_ID()

    </selectKey>

    insert into person (name, age, address

      )

    values (#{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}, #{address,jdbcType=VARCHAR}

      )

  </insert>

  <insert id="insertSelective" parameterType="com.xiaolyuh.domain.model.Person" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" >

      SELECT LAST_INSERT_ID()

    </selectKey>

    insert into person

    <trim prefix="(" suffix=")" suffixOverrides="," >

      <if test="name != null" >

        name,

      </if>

      <if test="age != null" >

        age,

      </if>

      <if test="address != null" >

        address,

      </if>

    </trim>

    <trim prefix="values (" suffix=")" suffixOverrides="," >

      <if test="name != null" >
        #{name,jdbcType=VARCHAR},

      </if>

      <if test="age != null" >

        #{age,jdbcType=INTEGER},

      </if>

      <if test="address != null" >

        #{address,jdbcType=VARCHAR},

      </if>

    </trim>

  </insert>

  <update id="updateByPrimaryKeySelective" parameterType="com.xiaolyuh.domain.model.Person" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    update person

    <set >

      <if test="name != null" >

        name = #{name,jdbcType=VARCHAR},

      </if>

      <if test="age != null" >

        age = #{age,jdbcType=INTEGER},

      </if>

      <if test="address != null" >

        address = #{address,jdbcType=VARCHAR},

      </if>

    </set>

    where id = #{id,jdbcType=BIGINT}

  </update>

  <update id="updateByPrimaryKey" parameterType="com.xiaolyuh.domain.model.Person" >

    <!--

      WARNING - @mbggenerated

      This element is automatically generated by MyBatis Generator, do not modify.

    -->

    update person

    set name = #{name,jdbcType=VARCHAR},

      age = #{age,jdbcType=INTEGER},

      address = #{address,jdbcType=VARCHAR}

    where id = #{id,jdbcType=BIGINT}

  </update>


<select id="findAll" resultMap="BaseResultMap">


select


<include refid="Base_Column_List" />

from person


</select>


<select id="findByPage" resultMap="BaseResultMap">


select


<include refid="Base_Column_List" />


from person


</select>


</mapper>

DAO层Mapper类

在Mapper接口上需要加上@Mapper注解，@Mapper注解声明成mybatis Dao层的Bean。也可以在配置类上使用@MapperScan("com.xiaolyuh.domain.mapper")注解声明。

package com.xiaolyuh.domain.mapper;
import com.github.pagehelper.Page;


import com.xiaolyuh.domain.model.Person;


import org.apache.ibatis.annotations.Mapper;


import java.util.List;

@Mapper//声明成mybatis Dao层的Bean，也可以在配置类上使用@MapperScan("com.xiaolyuh.domain.mapper")注解声明


public interface PersonMapper 
{

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">int</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">deleteByPrimaryKey</span><span class="hljs-params" style="">(Long id)</span></span>;</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">int</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">insert</span><span class="hljs-params" style="">(Person record)</span></span>;</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">int</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">insertSelective</span><span class="hljs-params" style="">(Person record)</span></span>;</br>

<span class="hljs-function" style="">Person <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">selectByPrimaryKey</span><span class="hljs-params" style="">(Long id)</span></span>;</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">int</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">updateByPrimaryKeySelective</span><span class="hljs-params" style="">(Person record)</span></span>;</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">int</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">updateByPrimaryKey</span><span class="hljs-params" style="">(Person record)</span></span>;</br></br>

<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">/**</br>
 * 获取所有数据</br>
 * <span class="hljs-doctag" style="color:rgb(221,17,68)">@return</span></br>
 */</span></br>
<span class="hljs-function" style="">List&lt;Person&gt; <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">findAll</span><span class="hljs-params" style="">()</span></span>;</br>

<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">/**</br>
 * 分页查询数据</br>
 * <span class="hljs-doctag" style="color:rgb(221,17,68)">@return</span></br>
 */</span></br>
<span class="hljs-function" style="">Page&lt;Person&gt; <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">findByPage</span><span class="hljs-params" style="">()</span></span>;</br>

}

实体类

package com.xiaolyuh.domain.model;
public class Person {

<span class="hljs-keyword" style="font-weight:700">private</span> Long id;</br>



    /**

     * 名称

     */

    private String name;

<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">/**</br>
 * 年龄</br>
 */</span></br>
<span class="hljs-keyword" style="font-weight:700">private</span> Integer age;</br>

<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">/**</br>
 * 地址</br>
 */</span></br>
<span class="hljs-keyword" style="font-weight:700">private</span> String address;</br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> Long <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">getId</span><span class="hljs-params" style="">()</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">return</span> id;</br>
}</br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">setId</span><span class="hljs-params" style="">(Long id)</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">this</span>.id = id;</br>
}</br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> String <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">getName</span><span class="hljs-params" style="">()</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">return</span> name;</br>
}</br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">setName</span><span class="hljs-params" style="">(String name)</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">this</span>.name = name;</br>
}</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> Integer <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">getAge</span><span class="hljs-params" style="">()</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">return</span> age;</br>
}</br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">setAge</span><span class="hljs-params" style="">(Integer age)</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">this</span>.age = age;</br>
}</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> String <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">getAddress</span><span class="hljs-params" style="">()</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">return</span> address;</br>
}</br></br>

<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">setAddress</span><span class="hljs-params" style="">(String address)</span> </span>{</br>
    <span class="hljs-keyword" style="font-weight:700">this</span>.address = address;</br>
}</br>

}

Service层

接口

package com.xiaolyuh.service;
import com.github.pagehelper.Page;


import com.xiaolyuh.domain.model.Person;


import java.util.List;


/**



Created by yuhao.wang on 2017/6/19.


*/


public interface PersonService 
{


List<Person> findAll();


/**


分页查询
@param pageNo 页号

@param pageSize 每页显示记录数

@return


*/


Page<Person> findByPage(int pageNo, int pageSize);



void insert(Person person);



}

实现类

package com.xiaolyuh.service.impl;
import com.github.pagehelper.Page;


import com.github.pagehelper.PageHelper;


import com.xiaolyuh.domain.mapper.PersonMapper;


import com.xiaolyuh.domain.model.Person;


import com.xiaolyuh.service.PersonService;


import org.springframework.beans.factory.annotation.Autowired;


import org.springframework.stereotype.Service;


import org.springframework.transaction.annotation.Transactional;


import java.util.List;

/**



Created by yuhao.wang on 2017/6/19.


*/


@Service


@Transactional(readOnly = true)


public class PersonServiceImpl 
implements PersonService {


@Autowired


private PersonMapper personMapper;


@Override


public List<Person> findAll() {


return personMapper.findAll();


}


@Override


public Page<Person> findByPage(int pageNo, int pageSize) {


PageHelper.startPage(pageNo, pageSize);


return personMapper.findByPage();


}


@Override


@Transactional


public void insert(Person person) {


personMapper.insert(person);


}



}

分页的包装类PageInfo

需要把Page包装成PageInfo对象才能序列化。该插件也默认实现了一个PageInfo

package com.xiaolyuh.page;

import java.io.Serializable;


import java.util.Collection;


import java.util.List;


import com.github.pagehelper.Page;


/**



对Page<E>结果进行包装



<p/>



新增分页的多项属性，主要参考:http://bbs.csdn.net/topics/360010907





@author liuzh/abel533/isea533



@version 3.3.0



@since 3.2.2



项目地址 : http://git.oschina.net/free/Mybatis_PageHelper


*/


@SuppressWarnings({"rawtypes", "unchecked"})

public class PageInfo<T> implements Serializable {

private static final long serialVersionUID = 1L;


//当前页


private int pageNum;


//每页的数量


private int pageSize;


//总记录数


private long total;


//总页数


private int pages;


//结果集


private List<T> list;

//是否为第一页


private boolean isFirstPage = false;


//是否为最后一页


private boolean isLastPage = false;


public PageInfo() {


}

/**



包装Page对象




@param list


*/


public PageInfo(List<T> list) {

if (list instanceof Page) {


Page page = (Page) list;


this.pageNum = page.getPageNum();


this.pageSize = page.getPageSize();


 <span class="hljs-keyword" style="font-weight:700">this</span>.pages = page.getPages();</br>
 <span class="hljs-keyword" style="font-weight:700">this</span>.list = page;</br>
 <span class="hljs-keyword" style="font-weight:700">this</span>.total = page.getTotal();</br>

} else if (list instanceof Collection) {


this.pageNum = 1;


this.pageSize = list.size();


 <span class="hljs-keyword" style="font-weight:700">this</span>.pages = <span class="hljs-number" style="color:teal">1</span>;</br>
 <span class="hljs-keyword" style="font-weight:700">this</span>.list = list;</br>
 <span class="hljs-keyword" style="font-weight:700">this</span>.total = list.size();</br></br>

}


if (list instanceof Collection) {


//判断页面边界


judgePageBoudary();


}


}



/**

判定页面边界

*/

private void judgePageBoudary() {


isFirstPage = pageNum == 1;


isLastPage = pageNum == pages;


}


public int getPageNum() {


return pageNum;


}





public void setPageNum(int pageNum) {


this.pageNum = pageNum;


}


public int getPageSize() {


return pageSize;


}


public void setPageSize(int pageSize) {


this.pageSize = pageSize;


}

public long getTotal() {


return total;


}


public void setTotal(long total) {


this.total = total;


}

public int getPages() {


return pages;


}

public void setPages(int pages) {


this.pages = pages;


}

public List<T> getList() {


return list;


}

public void setList(List<T> list) {


this.list = list;


}

public boolean isIsFirstPage() {


return isFirstPage;


}


public void setIsFirstPage(boolean isFirstPage) {


this.isFirstPage = isFirstPage;


}


public boolean isIsLastPage() {


return isLastPage;


}


public void setIsLastPage(boolean isLastPage) {


this.isLastPage = isLastPage;


}


@Override

public String toString() {

final StringBuffer sb = new StringBuffer("PageInfo{");

sb.append("pageNum=").append(pageNum);


sb.append(", pageSize=").append(pageSize);


sb.append(", total=").append(total);


sb.append(", pages=").append(pages);


sb.append(", list=").append(list);


sb.append(", isFirstPage=").append(isFirstPage);


sb.append(", isLastPage=").append(isLastPage);


sb.append(", navigatepageNums=");


sb.append('}');


return sb.toString();


}


}

测试类

package com.xiaolyuh;
import com.github.pagehelper.Page;


import com.xiaolyuh.domain.model.Person;


import com.xiaolyuh.page.PageInfo;


import com.xiaolyuh.service.PersonService;


import org.junit.Assert;


import org.junit.Before;


import org.junit.Test;


import org.junit.runner.RunWith;


import com.alibaba.fastjson.JSON;


import org.slf4j.Logger;


import org.slf4j.LoggerFactory;


import org.springframework.beans.factory.annotation.Autowired;


import org.springframework.boot.test.context.SpringBootTest;


import org.springframework.test.context.junit4.SpringRunner;





import java.util.List;


@RunWith(SpringRunner.class)


@SpringBootTest


public class PersonMapperTests {





private Logger logger = LoggerFactory.getLogger(PersonMapperTests.class);


<span class="hljs-annotation" style="">@Autowired</span></br>
<span class="hljs-keyword" style="font-weight:700">private</span> PersonService personService;</br>

<span class="hljs-annotation" style="">@Before</span></br>
<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">testInsert</span><span class="hljs-params" style="">()</span> </span>{</br>
	Person person = <span class="hljs-keyword" style="font-weight:700">new</span> Person();</br>
	person.setName(<span class="hljs-string" style="color:rgb(221,17,68)">"测试"</span>);</br>
	person.setAddress(<span class="hljs-string" style="color:rgb(221,17,68)">"address"</span>);</br>
	person.setAge(<span class="hljs-number" style="color:teal">10</span>);</br>
	personService.insert(person);</br></br>

	Assert.assertNotNull(person.getId());</br>
	logger.debug(JSON.toJSONString(person));</br>
}</br>

<span class="hljs-annotation" style="">@Test</span>
<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">testFindAll</span><span class="hljs-params" style="">()</span> </span>{</br>
	List&lt;Person&gt; persons = personService.findAll();</br></br>

	Assert.assertNotNull(persons);</br>
	logger.debug(JSON.toJSONString(persons));</br>
}</br>

<span class="hljs-annotation" style="">@Test</span></br>
<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">testFindByPage</span><span class="hljs-params" style="">()</span> </span>{</br>
	Page&lt;Person&gt; persons = personService.findByPage(<span class="hljs-number" style="color:teal">1</span>, <span class="hljs-number" style="color:teal">2</span>);</br>
	<span class="hljs-comment" style="color:rgb(153,153,136); font-style:italic">// 需要把Page包装成PageInfo对象才能序列化。该插件也默认实现了一个PageInfo</span></br>
	PageInfo&lt;Person&gt; pageInfo = <span class="hljs-keyword" style="font-weight:700">new</span> PageInfo&lt;&gt;(persons);</br>
	Assert.assertNotNull(persons);</br>
	logger.debug(pageInfo.toString());</br>
	logger.debug(JSON.toJSONString(pageInfo));</br>
}</br></br>

<span class="hljs-annotation" style="">@Test</span></br>
<span class="hljs-function" style=""><span class="hljs-keyword" style="font-weight:700">public</span> <span class="hljs-keyword" style="font-weight:700">void</span> <span class="hljs-title" style="color:rgb(153,0,0); font-weight:700">testCacheByPage</span><span class="hljs-params" style="">()</span> </span>{</br>
	<span class="hljs-keyword" style="font-weight:700">long</span> begin = System.currentTimeMillis();</br>
	List&lt;Person&gt; persons = personService.findAll();</br>
	<span class="hljs-keyword" style="font-weight:700">long</span> ing = System.currentTimeMillis();</br>
	personService.findAll();</br>
	<span class="hljs-keyword" style="font-weight:700">long</span> end = System.currentTimeMillis();</br>
	logger.debug(<span class="hljs-string" style="color:rgb(221,17,68)">"第一次请求时间："</span> + (ing - begin) + <span class="hljs-string" style="color:rgb(221,17,68)">"ms"</span>);</br>
	logger.debug(<span class="hljs-string" style="color:rgb(221,17,68)">"第二次请求时间:"</span> + (end - ing) + <span class="hljs-string" style="color:rgb(221,17,68)">"ms"</span>);</br></br>

	Assert.assertNotNull(persons);</br>
	logger.debug(persons.toString());</br>
	logger.debug(JSON.toJSONString(persons));</br>
}</br>

}

  </div>