ssm+maven+pageHelper搭建maven项目实现快速分页
PageHelper分页使用:
插件的环境引入：
1.pom文件中引入分页插件的资源位置：
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.6</version>
</dependency>
2.在mybatis的spring配置文件中引入插件：
<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/ithaha/mapper/*.xml"></property>
<!-- 配置分页插件 -->
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageHelper">
<property name="properties">
<value>
dialect=mysql
reasonable=true
</value>
</property>
</bean>
</array>
</property>
</bean>
项目结构如下：
pom.xml :
<?xml version="1.0" encoding="UTF-8"?> <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.dengwei</groupId> <artifactId>demo2</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <!-- spring版本号 --> <spring.version>4.2.5.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.2.8</mybatis.version> <!-- mysql驱动版本号 --> <mysql-driver.version>5.1.29</mysql-driver.version> <!-- log4j日志包版本号 --> <slf4j.version>1.7.18</slf4j.version> <log4j.version>1.2.17</log4j.version> </properties> <dependencies> <!-- 添加jstl依赖 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency> <!-- 添加junit4依赖 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <!-- 指定范围，在测试时才会加载 --> <scope>test</scope> </dependency> <!-- 添加spring核心依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- 添加mybatis依赖 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- 添加mybatis/spring整合包依赖 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- 添加mysql驱动依赖 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql-driver.version}</version> </dependency> <!-- 添加数据库连接池依赖 --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.2.2</version> </dependency> <!-- 添加fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.1.41</version> </dependency> <!-- 添加日志相关jar包 --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!-- log end --> <!-- 映入JSON --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.8.0</version> </dependency> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.0</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.9</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>compile</scope> </dependency> <!--分页插件--> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.6</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.7</version> </dependency> </dependencies> </project>
springConfig.xm:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:tx="http://www.springframework.org/schema/tx" 6 xmlns:mvc="http://www.springframework.org/schema/mvc" 7 xsi:schemaLocation="http://www.springframework.org/schema/beans 8 http://www.springframework.org/schema/beans/spring-beans.xsd 9 http://www.springframework.org/schema/context 10 http://www.springframework.org/schema/context/spring-context.xsd 11 http://www.springframework.org/schema/tx 12 http://www.springframework.org/schema/tx/spring-tx.xsd 13 http://www.springframework.org/schema/mvc 14 http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 15 <!--开启注解--> 16 <mvc:annotation-driven/> 17 <!-- 自动扫描 --> 18 <context:component-scan base-package="com.dengwei.controller,com.dengwei.service.impl"/> 19 20 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 21 <property name="locations"> 22 <list> 23 <value>classpath*:jdbc.properties</value> 24 </list> 25 </property> 26 </bean> 27 28 <!-- 配置数据源 --> 29 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 30 destroy-method="close"> 31 <property name="driverClassName" value="${driverClasss}"/> 32 <property name="url" value="${jdbcUrl}"/> 33 <property name="username" value="${username}"/> 34 <property name="password" value="${password}"/> 35 <!-- 初始化连接大小 --> 36 <property name="initialSize" value="${initialSize}"></property> 37 <!-- 连接池最大数量 --> 38 <property name="maxActive" value="${maxActive}"></property> 39 <!-- 连接池最大空闲 --> 40 <property name="maxIdle" value="${maxIdle}"></property> 41 <!-- 连接池最小空闲 --> 42 <property name="minIdle" value="${minIdle}"></property> 43 <!-- 获取连接最大等待时间 --> 44 <property name="maxWait" value="${maxWait}"></property> 45 </bean> 46 47 <!-- mybatis和spring完美整合，不需要mybatis的配置映射文件 --> 48 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 49 <property name="dataSource" ref="dataSource"/> 50 <!-- 自动扫描mapping.xml文件 --> 51 <property name="mapperLocations" value="classpath:mapping/*Mapper.xml"></property> 52 53 <!-- 配置分页插件 --> 54 <property name="plugins"> 55 <array> 56 <bean class="com.github.pagehelper.PageHelper"> 57 <property name="properties"> 58 <value> 59 dialect=mysql 60 reasonable=true 61 </value> 62 </property> 63 </bean> 64 </array> 65 </property> 66 </bean> 67 68 <!-- DAO接口所在包名，Spring会自动查找其下的类 --> 69 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 70 <property name="basePackage" value="com.dengwei.dao"/> 71 <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> 72 </bean> 73 74 75 <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx --> 76 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 77 <property name="dataSource" ref="dataSource"/> 78 </bean> 79 80 <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx --> 81 <tx:annotation-driven transaction-manager="transactionManager"/> 82 </beans>
jdbc.properties :
1 driverClasss=com.mysql.jdbc.Driver 2 jdbcUrl=jdbc:mysql://localhost:3306/testsql 3 username=root 4 password=admin 5 6 #定义初始连接数 7 initialSize=0 8 #定义最大连接数 9 maxActive=20 10 #定义最大空闲 11 maxIdle=20 12 #定义最小空闲 13 minIdle=1 14 #定义最长等待时间 15 maxWait=60000
log4j.properties :
1 log4j.rootLogger=INFO,Console,File 2 3 #控制台日志 4 log4j.appender.Console=org.apache.log4j.ConsoleAppender 5 log4j.appender.Console.Target=System.out 6 log4j.appender.Console.layout=org.apache.log4j.PatternLayout 7 log4j.appender.Console.layout.ConversionPattern=[%p][%t][%d{yyyy-MM-dd HH:mm:ss}][%C] - %m%n 8 9 #普通文件日志 10 log4j.appender.File=org.apache.log4j.RollingFileAppender 11 log4j.appender.File.File=logs/ssm.log 12 log4j.appender.File.MaxFileSize=10MB 13 #输出日志，如果换成DEBUG表示输出DEBUG以上级别日志 14 log4j.appender.File.Threshold=ALL 15 log4j.appender.File.layout=org.apache.log4j.PatternLayout 16 log4j.appender.File.layout.ConversionPattern=[%p][%t][%d{yyyy-MM-dd HH:mm:ss}][%C] - %m%n
web.xml :
注意：在idea我的web.xml中有爆红的，但是不影响程序运行。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 5 version="3.1"> 6 <!--添加过滤器--> 7 <filter> 8 <filter-name>characterEncodingFilter</filter-name> 9 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 10 <init-param> 11 <param-name>encoding</param-name> 12 <param-value>UTF-8</param-value> 13 </init-param> 14 <init-param> 15 <param-name>forceEncoding</param-name> 16 <param-value>true</param-value> 17 </init-param> 18 </filter> 19 <filter-mapping> 20 <filter-name>characterEncodingFilter</filter-name> 21 <url-pattern>/*</url-pattern> 22 </filter-mapping> 23 <!--配置spring--> 24 <servlet> 25 <servlet-name>dispatcherServlet</servlet-name> 26 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 27 <init-param> 28 <param-name>contextConfigLocation</param-name> 29 <param-value>classpath:springConfig.xml</param-value> 30 </init-param> 31 </servlet> 32 <servlet-mapping> 33 <servlet-name>dispatcherServlet</servlet-name> 34 <url-pattern>/</url-pattern> 35 </servlet-mapping> 36 <!--自定义首页--> 37 <!-- <welcome-file-list> 38 <welcome-file>/first/page</welcome-file> 39 </welcome-file-list>--> 40 41 <!--读取静态文件--> 42 <servlet-mapping> 43 <servlet-name>default</servlet-name> 44 <url-pattern>*.js</url-pattern> 45 <url-pattern>*.css</url-pattern> 46 <url-pattern>*.woff</url-pattern> 47 <url-pattern>*.woff2</url-pattern> 48 <url-pattern>*.ttf</url-pattern> 49 <url-pattern>*.png</url-pattern> 50 <url-pattern>*.jpg</url-pattern> 51 <url-pattern>*.ogg</url-pattern> 52 <url-pattern>*.mp4</url-pattern> 53 </servlet-mapping> 54 55 56 </web-app>
下面我们看一下分页的实现，这里我只贴了Cotroller层的代码：
controller：
package com.dengwei.controller; import com.dengwei.model.ProductAndResource; import com.dengwei.service.IProductService; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import java.util.List; @Controller @RequestMapping("/list") public class ProductController { @Autowired private IProductService productService; @RequestMapping("/product") @ResponseBody public PageInfo<ProductAndResource> productList(Integer currentPage, Integer pageSize){ // PageHelper.startPage(currentPage,currentPage);必须在上面才能实现分页 PageHelper.startPage(currentPage,pageSize); List<ProductAndResource> list = productService.queryProductInfo(); PageInfo pageInfo= new PageInfo(list); return pageInfo;
}
}
最终返回给前端的是PageInfo对象：
3.PageInfo类说明
1 public class PageInfo<T> implements Serializable { 2 private static final long serialVersionUID = 1L; 3 //当前页 4 private int pageNum; 5 //每页的数量 6 private int pageSize; 7 //当前页的数量 8 private int size; 9 10 //由于startRow和endRow不常用，这里说个具体的用法 11 //可以在页面中"显示startRow到endRow 共size条数据" 12 13 //当前页面第一个元素在数据库中的行号 14 private int startRow; 15 //当前页面最后一个元素在数据库中的行号 16 private int endRow; 17 //总记录数 18 private long total; 19 //总页数 20 private int pages; 21 //结果集 22 private List<T> list; 23 24 //前一页 25 private int prePage; 26 //下一页 27 private int nextPage; 28 29 //是否为第一页 30 private boolean isFirstPage = false; 31 //是否为最后一页 32 private boolean isLastPage = false; 33 //是否有前一页 34 private boolean hasPreviousPage = false; 35 //是否有下一页 36 private boolean hasNextPage = false; 37 //导航页码数 38 private int navigatePages; 39 //所有导航页号 40 private int[] navigatepageNums; 41 //导航条上的第一页 42 private int navigateFirstPage; 43 //导航条上的最后一页 44 private int navigateLastPage; 45 46 public PageInfo() { 47 } 48 49 /** 50 * 包装Page对象 51 * 52 * @param list 53 */ 54 public PageInfo(List<T> list) { 55 this(list, 8); 56 } 57 58 /** 59 * 包装Page对象 60 * 61 * @param list page结果 62 * @param navigatePages 页码数量 63 */ 64 public PageInfo(List<T> list, int navigatePages) { 65 if (list instanceof Page) { 66 Page page = (Page) list; 67 this.pageNum = page.getPageNum(); 68 this.pageSize = page.getPageSize(); 69 70 this.pages = page.getPages(); 71 this.list = page; 72 this.size = page.size(); 73 this.total = page.getTotal(); 74 //由于结果是>startRow的，所以实际的需要+1 75 if (this.size == 0) { 76 this.startRow = 0; 77 this.endRow = 0; 78 } else { 79 this.startRow = page.getStartRow() + 1; 80 //计算实际的endRow（最后一页的时候特殊） 81 this.endRow = this.startRow - 1 + this.size; 82 } 83 } else if (list instanceof Collection) { 84 this.pageNum = 1; 85 this.pageSize = list.size(); 86 87 this.pages = this.pageSize > 0 ? 1 : 0; 88 this.list = list; 89 this.size = list.size(); 90 this.total = list.size(); 91 this.startRow = 0; 92 this.endRow = list.size() > 0 ? list.size() - 1 : 0; 93 } 94 if (list instanceof Collection) { 95 this.navigatePages = navigatePages; 96 //计算导航页 97 calcNavigatepageNums(); 98 //计算前后页，第一页，最后一页 99 calcPage(); 100 //判断页面边界 101 judgePageBoudary(); 102 } 103 } 104 105 106 ....... 107 }
二、上述在方法是在方法内部针对当前方法进行分页，如果想针对指定以某个单词结尾的所有方法分页，可以使用拦截器：
1：上面的配置不变（导入依赖、spring配置文件中引入插件）
2： 编写拦截器（规定以paging结尾的方法就是分页的方法，拦截controller层中以paging为结尾的方法）
依赖：
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.7</version>
</dependency>
PageInterceptor ：
@Aspect
@Component
public class PageInterceptor {
@Around("execution(* com.ithaha.controller..*.*Paging(..))")
public Object process(ProceedingJoinPoint point) throws Throwable {
Object[] args = point.getArgs();
if(args.length<2) {
//规定原方法的参数最后两个是当前页和每页条数
throw new Exception("参数不够分页");
}
PageHelper.startPage((Integer)args[args.length-2],(Integer)args[args.length-1]);
List list = (List) point.proceed();
PageInfo pageInfo = new PageInfo(list);
return pageInfo;
}
}
只要你想分页，只需满足：1.方法名字以paging结尾 .2.方法参数最后两个是当前页和每页条数