SSM框架整合(实现从数据库到页面展示)
首先创建一个spring-web项目,然后需要配置环境dtd文件的引入,环境配置,jar包引入。
首先让我来看一下ssm的基本项目配件。(代码实现)
1.首先编写web.xml文件。
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>ssmdemo</display-name> <!-- 创建spring容器:为了查找spring容器要管理的所有bean --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/application*.xml</param-value> </context-param> <!-- g该类在web.jar的context包下的ContextLoaderListener,该类实现了监听器接口 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 创建前端控制器 --> <servlet> <servlet-name>ssm</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/spring-mvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>ssm</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app>
2.建mybatis-config.xml和spring-mvc.xml文建的配置。
1.myatis-config.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "http://mybatis.org/dtd/mybatis-3-config.dtd" "mybatis-3-config.dtd" > <configuration> <typeAliases> <package name="com.bean.*" /> </typeAliases> </configuration>
2.spring-mvc.xml(使用注解扫描@Controller,@ResquestMapping(“指定路径”))
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 开启注解扫描 --> <context:component-scan base-package="com.controller,com.service.impl" /> <!-- 开启处理器 --> <mvc:annotation-driven /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/pages/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
3.application-dao.xml,application-tx,application-service配置
1)application-dao.xml和IUsersDao.xml的配置以及IUsersDao.java类的实现。
1.application-dao.xml:IUsersDao.java的配置(数据库查询数据)
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 配置数据源 c3p0数据库连接池。到对应的连接池jar中找 --> <context:property-placeholder location="classpath:db.properties" /> <bean id="ds" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="DriverClass" value="${Adirver}"></property> <property name="JdbcUrl" value="${Aurl}"></property> <property name="User" value="${Ausername}"></property> <property name="Password" value="${Apassword}"></property> </bean> <!-- factory:mybatis-spring整合包中找。 --> <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property> <property name="dataSource" ref="ds"></property> </bean> <!-- 批量创建dao代理类对象:符合mybatis的mapper代理方式规范 -->
2.IUsersDao.java类
package com.dao; import java.util.List; import com.bean.UsersBean; public interface IUsersDao { /** * 过去所有用户 * @return */ public List<UsersBean> getAllUser(); }
3.IUsersDao.xml:Mapper映射。
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "http://mybatis.org/dtd/mybatis-3-mapper.dtd" "mybatis-3-mapper.dtd" > <mapper namespace="com.dao.IUsersDao"> <select id="getAllUser" resultType="com.bean.UsersBean"> select * from users </select> </mapper>
2)application-service.xml和UsersService.java
1.application-service.xml:业务层的xml配置,创建bean是IUsersBean与UsersService关联。
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <bean id="usersService" class="com.service.impl.UsersServiceImpl" /> </beans>
2.UsersSerivce.java类
package com.service.impl; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import com.bean.UsersBean; import com.dao.IUsersDao; import com.service.IUsersService; public class UsersServiceImpl implements IUsersService { @Autowired private IUsersDao userDao; @Override public List<UsersBean> findAllUser() { // TODO Auto-generated method stub return userDao.getAllUser(); } }
3)application-tr.xml配置
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 事务配置管理器 :jdbc->jdbc.datasource --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="ds"></property> </bean> <!-- 增强,通知 --> <tx:advice id="advice" transaction-manager="transactionManager"> <tx:attributes> <!-- 此处规定开发的方法前缀规范: --> <!-- 增删 改的方法REQUIRED(required) --> <!-- 查询所有方法是SUPPORTS,read-only --> <tx:method name="add*" propagation="REQUIRED" /> <tx:method name="delete*" propagation="REQUIRED" /> <tx:method name="update*" propagation="REQUIRED" /> <tx:method name="find*" propagation="SUPPORTS" read-only="true" /> <tx:method name="get*" propagation="SUPPORTS" read-only="true" /> </tx:attributes> </tx:advice> <!-- 定义aop --> <aop:config> <aop:pointcut expression="execution(* com.service.impl.*.*(..))" id="pcut" /> <aop:advisor advice-ref="advice" pointcut-ref="pcut" /> </aop:config> </beans>
4.Controller类的配置(注解配置)
1.返回路径相当于地址栏。
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * 返回相等路径 * * @param request * @return * @throws Exception */ @RequestMapping("/showAll") public String showAll(Model model) { // 调用业务方法 List<UsersBean> list = usersService.findAllUser(); // 将list返回 model.addAttribute("USER", list); // 跳转到pages/users/showUsers.jsp页面,转发或者重定向 // return "forward:pages/users/showUsers.jsp"; return "users/showUsers"; } }
2.返回 累行为ModelAndView
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * ModelAndView * * @return */ @RequestMapping("/showAll") public ModelAndView showAll() { // 获取业务的查询结果 List<UsersBean> list = usersService.findAllUser(); // 将查询的结果集合显示到pages/showUsers.jsp ModelAndView m = new ModelAndView(); // 存储list m.addObject("USER", list); // 指定试图资源: // 由于spring-mvc.xml文件中配置了试图解析器的前缀和后缀 m.setViewName("users/showUsers"); return m; } }
3.返回forward转发
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * 转发 * * @param request * @param response * @throws Exception */ @RequestMapping("/showAll") public void showAll(HttpServletRequest request, HttpServletResponse response) throws Exception { // 调用业务方法 List<UsersBean> list = usersService.findAllUser(); // 将list返回 request.setAttribute("USER", list); // 跳转到pages/users/showUsers.jsp页面,转发或者重定向 // request.getRequestDispatcher("pages/users/showUsers.jsp").forward(request, // response); response.sendRedirect("pages/users/showUsers.jsp"); }
4.返回为重定向。
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * 重定向 * * @param request * @param response * @throws Exception */ @RequestMapping("/showAll") public void showAll1(HttpServletRequest request, HttpServletResponse response) throws Exception { // 调用业务方法 List<UsersBean> list = usersService.findAllUser(); // 将list返回 HttpSession session = request.getSession(); session.setAttribute("USER", list); // 跳转到pages/users/showUsers.jsp页面,转发或者重定向 response.sendRedirect("pages/users/showUsers.jsp"); }
5.直接return “redirect:pages/users/showUsers.jsp”
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * 返回值为String * * @param request * @param response * @return * @throws Exception */ @RequestMapping("/showAll") public String showAll(HttpServletRequest request) throws Exception { // 调用业务方法 List<UsersBean> list = usersService.findAllUser(); // 将list返回 HttpSession session=request.getSession(); session.setAttribute("USER", list); // 跳转到pages/users/showUsers.jsp页面,转发或者重定向 return "forward:pages/users/showUsers.jsp"; // return "redirect:pages/users/showUsers.jsp"; }
7.直接return“forward:pages/users/showUsers.jsp”;
package com.controller; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.bean.UsersBean; import com.service.IUsersService; /** * Handler * * @author Ya * */ @Controller public class UsersController { @Resource(name = "usersService") private IUsersService usersService; /** * 返回值为String * * @param request * @param response * @return * @throws Exception */ @RequestMapping("/showAll") public String showAll(HttpServletRequest request) throws Exception { // 调用业务方法 List<UsersBean> list = usersService.findAllUser(); // 将list返回 request.setAttribute("USER", list); // 跳转到pages/users/showUsers.jsp页面,转发或者重定向 return "forward:pages/users/showUsers.jsp"; }
以上随便一种方式都是可以的。
总结:
1.我们主要是学习了ssm整合,把数据库的数据的数据展示到网页中。主要分为
dao-->service-->controller-->jsp
2.
1)dao主要是辅助取出数据库的数据,dao到daoMapper批量映射。获取数据,链接数据库是又application-dao.xml文件来集成配置管理。
2)service 为业务层,由application-service.xml文件管理。主要是配置IUsersDao,使service中不用newIUsersDao。
3)controller主要是将业务层取来数据传递到jsp页面中,然后将数据携带到要跳转的jsp页面中。
4)jsp接受并展示数据controller中传递来的参数。
3.spring中的application*.xml和spring-mvc.xml的xml文件在WEB-INF/web.xml中进行解析;
mybatis中的mybatis-config.xml中的xml文件在application-dao.xml文件中被解析。
有问题请留言!!
原文地址:https://www.cnblogs.com/meiLinYa/p/8746174.html