1.搭建开发环境
---引入ioc、aop、dao、webmvc、mysql驱动包、dbcp包
---在src下添加applicationContext.xml
2.编写entity包下的实体类，dao包下的操作数据库的类，以及mapper包下的查询时封装成对象的类
①entity下的Emp类
package entity;
import java.io.Serializable;
public class Emp implements Serializable{
private Integer id;
private String name;
private Double salary;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getSalary() {
return salary;
}
public void setSalary(Double salary) {
this.salary = salary;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
②dao下的EmpDao类
@Repository
public class EmpDao {
@Resource
private JdbcTemplate template;
public List<Emp> findAll(){
String sql = "select * from emp";
EmpRowMapper rowMapper = new EmpRowMapper();
List<Emp> list = template.query(sql, rowMapper);
return list;
}
}
③mapper下的EmpRowMapper类
public class EmpRowMapper implements RowMapper{
@Override
public Object mapRow(ResultSet rs, int index) throws SQLException {
Emp emp = new Emp();
emp.setId(rs.getInt("id"));
emp.setName(rs.getString("name"));
emp.setSalary(rs.getDouble("salary"));
emp.setAge(rs.getInt("age"));
return emp;
}
}
3.配置文件
①web.xml
<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:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
②applicationContext.xml
<context:component-scan base-package="dao"></context:component-scan>
<bean id="template" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dbcp"></property>
</bean>
<bean id="dbcp" class="org.apache.commons.dbcp.BasicDataSource">
<property name="username" value="root"></property>
<property name="password" value="123456"></property>
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql:///mybatis"></property>
</bean>
<mvc:annotation-driven></mvc:annotation-driven>
<context:component-scan base-package="controller"></context:component-scan>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
4.编写ListController和jsp界面
①ListController
@Controller
public class ListController {
@RequestMapping("/list.do")
public ModelAndView execute(){
ModelAndView mav = new ModelAndView();
//获取dao的对象不能通过new新建来获取，要通过配置来获取
String conf = "applicationContext.xml";
ApplicationContext ac = new ClassPathXmlApplicationContext(conf);
EmpDao empDao = ac.getBean("empDao",EmpDao.class);
List<Emp> list = empDao.findAll();
mav.getModel().put("list1", list);
mav.setViewName("list");
return mav;
}
}
②list.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="dao.*,entity.*,java.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<table>
<tr>
<td>ID</td>
<td>name</td>
</tr>
<%
List<Emp> list = (List<Emp>)request.getAttribute("list1");
for(int i=0;i<list.size();i++){
Emp e = list.get(i);
%>
<tr>
<td><%=e.getId() %></td>
<td><%=e.getName() %></td>
</tr>
<%
}
%>
</table>
</body>
</html>
5.效果
