SSM框架整合(实现从数据库到页面展示)

　　　　　　　　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！！