Spring MVC分页示例
分页用于在不同部分显示大量记录。在这种情况下，我们将在一页中显示10、20或50条记录。对于其余记录，我们提供链接。
我们可以在Spring MVC中简单地创建分页示例。在此分页示例中，我们使用MySQL数据库来获取记录。
创建表或导入SQL文件
在这里，我们已经在"测试"数据库中创建了" emp"表。 emp表具有三个字段: ID，名称和薪水。创建表并手动插入记录，或导入我们的SQL文件。
Spring MVC分页示例
1、将依赖项添加到pom.xml文件。
pom.xml
示例
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.1.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jasper</artifactId>
<version>9.0.12</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.1.RELEASE</version>
</dependency>2、创建bean类
在这里，bean类包含对应于数据库中存在的字段的变量(以及setter和getter方法)。
Emp.java
示例
package com.nhooo.beans;
public class Emp {
private int id;
private String name;
private float salary;
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 float getSalary() {
return salary;
}
public void setSalary(float salary) {
this.salary = salary;
}
}3、创建控制器类
在控制器类中， @PathVariable批注将方法参数与临时URL绑定在一起。例如:
示例
@RequestMapping(value="/viewemp/{pageid}")在此处，{}括号包含临时值。
EmpController.java
示例
package com.nhooo.controllers;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import com.nhooo.beans.Emp;
import com.nhooo.dao.EmpDao;
@Controller
public class EmpController {
@Autowired
EmpDao dao;
@RequestMapping(value="/viewemp/{pageid}")
public String edit(@PathVariable int pageid,Model m){
int total=5;
if(pageid==1){}
else{
pageid=(pageid-1)*total+1;
}
System.out.println(pageid);
List<Emp> list=dao.getEmployeesByPage(pageid,total);
m.addAttribute("msg", list);
return "viewemp";
}
}4、创建DAO类
让我们创建一个DAO类以访问数据库中所需的数据。
EmpDao.java
示例
package com.nhooo.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import com.nhooo.beans.Emp;
public class EmpDao {
JdbcTemplate template;
public void setTemplate(JdbcTemplate template) {
this.template = template;
}
public List<Emp> getEmployeesByPage(int pageid,int total){
String sql="select * from emp limit "+(pageid-1)+","+total;
return template.query(sql,new RowMapper<Emp>(){
public Emp mapRow(ResultSet rs, int row) throws SQLException {
Emp e=new Emp();
e.setId(rs.getInt(1));
e.setName(rs.getString(2));
e.setSalary(rs.getfloat(3));
return e;
}
});
}
}5、在web.xml文件中提供控制器的条目
web.xml
示例
<?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_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>SpringMVC</display-name>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>6、在xml文件中定义Bean
spring-servlet.xml
示例
<?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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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">
<context:component-scan base-package="com.nhooo.controllers"></context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
<property name="username" value=""></property>
<property name="password" value=""></property>
</bean>
<bean id="jt" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="ds"></property>
</bean>
<bean id="dao" class="com.nhooo.dao.EmpDao">
<property name="template" ref="jt"></property>
</bean>
</beans>7、创建请求的页面
index.jsp
示例
<!DOCTYPE html>
<html>
<body>
<a href="viewemp/1">View Employees</a>
</body>
</html>8、创建视图组件
viewemp.jsp
示例
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html public "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
<h1>Employees List</h1>
<table border="2" width="70%" cellpadding="2">
<tr><th>Id</th><th>Name</th><th>Salary</th></tr>
<c:forEach var="emp" items="${msg}">
<tr>
<td>${emp.id}</td>
<td>${emp.name}</td>
<td>${emp.salary}</td>
</tr>
</c:forEach>
</table>
<br/>
<a href="/SpringMVCPaginationExample/viewemp/1">1</a>
<a href="/SpringMVCPaginationExample/viewemp/2">2</a>
<a href="/SpringMVCPaginationExample/viewemp/3">3</a>
</body>
</html>输出:
