springMVC+spring+MyBatis(SSM)的簡單配置
SSM(Spring+SpringMVC+MyBatis)框架集由Spring、SpringMVC、MyBatis三個開源框架整合而成,常作為數據源較簡單的web項目的框架。
其中:
Spring是一個輕量級的控制反轉(IOC)和面向切面(AOP)的容器框架。
SpringMVC分離了模型對象(Model)、視圖(View)、控制器(Controller),這種分離讓它們更容易進行定制。
MyBatis是一個支持普通SQL查詢,存儲過程和高級映射的優秀持久層框架。
今天,就帶領大家見證基礎,進行SSM的學習。
在此之前呢,首先要引入的是系統分層
表示層(UI):數據展現 / 操作界面,請求分發(總所周知的MVC 是表示層的架構思想)。
持久層(服務層):封裝業務邏輯處理。
持久層(數據訪問層):封裝數據訪問邏輯。
而各層之間的關系呢,表示層通過接口調用業務層,業務層通過接口調用持久層。之所以引入系統分層的概念,主要的原因是:當下一層的實現發生改變的時候,並不會影響下一層。
敘述的就是這些了,開始我們的項目了
首先創建一個maven項目,格局如下:
1.pom.xml
<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.ninemax</groupId> <artifactId>springMVC-test2</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.1.2.RELEASE</version> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc14</artifactId> <version>10.2.0.3.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.5.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>3.2.8</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.2</version> </dependency> </dependencies> </project>
2.User.java
package com.nine.entity; public class User { private String name; private Integer age; private String gender; private Double salary; public String getName() { return name; } public void setName(String name) { this.name = name; }View Codepublic Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public Double getSalary() { return salary; } public void setSalary(Double salary) { this.salary = salary; } @Override public String toString() { return "User [name=" + name + ", age=" + age + ", gender=" + gender + ", salary=" + salary + "]"; } }
3.UserDao.java
package com.nine.dao; import java.util.List; import com.nine.entity.User; public interface UserDao { List<User> findAll(); }View Code
4.UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"> <mapper namespace="com.nine.dao.UserDao"> <select id="findAll" resultType="com.nine.entity.User"> SELECT * FROM T_USER </select> </mapper>View Code
5.UserService.java
package com.nine.service; import java.util.List; import com.nine.entity.User; public interface UserService { List<User> userList(); }View Code
6.UserServiceImpl
package com.nine.service; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.nine.dao.UserDao; import com.nine.entity.User; @Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; public List<User> userList() { List<User> list = userDao.findAll(); return list; } }View Code
7.UserController
package com.nine.controller; import java.util.ArrayList; import java.util.List; import javax.servlet.http.HttpServletRequest; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.nine.entity.User; import com.nine.service.UserService; @Controller public class UserController { @Autowired private UserService userService; @RequestMapping("/hello") public String hello(HttpServletRequest request) { List<User> list = new ArrayList<User>(); try { list = userService.userList(); } catch (Exception e) { e.printStackTrace(); return "error"; } request.setAttribute("list", list); return "hello"; } }View Code
8.application.properties
spring.datasource.url=jdbc:oracle:thin:@10.21*.4.2*:1521:orcl spring.datasource.username=* spring.datasource.password=* spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
9.spring-mvc.xml (這是springMVC重要的配置文件,前往不能忽略)
<?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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd"> <!-- 配置組件掃描 --> <context:component-scan base-package="com.nine"/> <!-- 配置MVC註解掃描 --> <mvc:annotation-driven/> <!-- 配置視圖解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/"/> <property name="suffix" value=".jsp"/> </bean> <util:properties id="application" location="classpath:application.properties"/> <bean id="ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="#{application[‘spring.datasource.driver-class-name‘]}"/> <property name="url" value="#{application[‘spring.datasource.url‘]}"/> <property name="username" value="#{application[‘spring.datasource.username‘]}"/> <property name="password" value="#{application[‘spring.datasource.password‘]}"/> </bean> <!-- 配置SqlSessionFactoryBean --> <!-- 該bean的作用是用來代替MyBatis配置文件 --> <bean class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 指定連接池 --> <property name="dataSource" ref="ds"/> <!-- 指定映射文件位置 --> <property name="mapperLocations" value="classpath:com/nine/dao/*.xml"/> </bean> <!-- 配置MapperScannerConfigurer --> <!-- 該bean會掃描指定包及其子包下面的所有的Mapper映射器(接口),然後生成符合該接口要求的對象 (通過調用SqlSession的getMapper方法),接下來,會將這些對象(即Mapper映射器的實現對象)添加 到Spring容器裏面(默認的id是首字母小寫之後的接口名) --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 指定要掃描的包 --> <property name="basePackage" value="com.nine.dao"/> </bean> </beans>View Code
10.記住了!還有一個地方 web.xml,不要忘了。
<?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_2_5.xsd" version="2.5"> <display-name>springMVC-test2</display-name> <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:spring-mvc.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> </web-app>View Code
接下來就是簡單的一些靜態頁面了,這裏我沒有做太好的描述,只有一些簡單的頁面供大家參考
hello.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@ page import="java.util.*" 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>list</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="css/style.css" /> </head> <body> <h1> 列表 </h1> <table border="1px" cellspacing="0px" style="border-collapse:collapse"> <tr> <td> 姓名 </td> <td> 年齡 </td> <td> 性別 </td> <td> 薪資 </td> </tr> <c:forEach items="${list}" var="e" varStatus="s"> <tr> <td>${e.name}</td> <td>${e.age }</td> <td>${e.gender }</td> <td>${e.salary}</td> </tr> </c:forEach> </table> </body> </html>View Code
error.jsp
<%@page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<html>
<head></head>
<body style="font-size:30px;">
系統繁忙,稍後重試
</body>
</html>
View Code
做到這裏,基本上就算做完了,不過首先呢,在完成了之後,最好是先做一個測試類,看是否能夠找出結果
UserTest.java
package test; import java.util.List; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.nine.dao.UserDao; import com.nine.entity.User; public class UserTest { @Test public void test1() { @SuppressWarnings("resource") ApplicationContext ac = new ClassPathXmlApplicationContext("spring-mvc.xml"); UserDao dao = ac.getBean("userDao", UserDao.class); List<User> list = dao.findAll(); System.out.println(list); } }View Code
然後運行這個測試類,看是否正確,如果在控制臺出現結果,恭喜你你已經完成了!
然後運行Tomcat,輸入http://localhost:8081/springMVC-test2/hello
不知道大家完成的怎麽樣了,如果出現問題,可以在下面進行留言,我會為大家進行解答.
springMVC+spring+MyBatis(SSM)的簡單配置