[Java知识库]ssm项目搭建

编辑器:idea（已经下载配置好maven和tomcat）
整合的思路

• .1. 先搭建整合的环境
• .2. 先把Spring的配置搭建完成
• .3. 再使用Spring整合SpringMVC框架
• .4. 最后使用Spring整合MyBatis框架

1.配置maven

2.新建项目



3.导入依赖包，文件是pom.xml (编辑器会提示)

<?xml version="1.0" encoding="UTF-8"?>
<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>org.example</groupId>
    <artifactId>springmvc01</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>war</packaging>

    <dependencies>
        <!-- spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.6.RELEASE</version>
        </dependency>

        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jstl-impl</artifactId>
            <version>1.2</version>
        </dependency>


        <!-- servlet编译环境 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- jsp编译环境 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- FastJson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.54</version>
        </dependency>

        <!-- pagehelper 分页 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>


        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.16.RELEASE</version>
        </dependency>

        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.1.16.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.16.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.16.RELEASE</version>
        </dependency>

        <!-- spring整合mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- MyBatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <!-- mysql驱动依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <!-- 连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.12</version>
        </dependency>

        <!-- Junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!-- log4j -->
        <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>






    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
<!--                    <include>*.xml</include>-->
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

</project>

4.本质是tomcat运行网站的目录，所以新建如下目录

其中，web.xml内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!-- SpringMVC前端控制器
        1.前端：接受所有请求
        2.启动springMVC工厂 mvc.xml
        3.springmvc流程调度

    -->

    <servlet>
        <servlet-name>my_shine</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:mvc.xml</param-value>
        </init-param>
        <!-- 懒加载 饿加载  可选  -->
        <load-on-startup>1</load-on-startup>
    </servlet>


    <servlet-mapping>
        <servlet-name>my_shine</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


    <!-- 解决post请求中文乱码的过滤器 -->
    <!-- 此时过滤器会进行：request.setCharactorEncoding("utf-8"); -->
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 启动spring -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

</web-app>

5.在web.xml中会引用springmvc的配置文件mvc.xml和spring的配置文件applicationContext.xml,内容如下：

<!--suppress ALL -->
<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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 注解扫描 扫描controller的注解，别的不扫描-->
    <context:component-scan base-package="com.qf" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 注解驱动 -->
    <mvc:annotation-driven>
        <!--  安装FastJson,转换器 -->
        <mvc:message-converters>
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <!--  声明转换类型:json -->
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json</value>
                    </list>
                </property>

                <property name="features">
                    <array value-type="com.alibaba.fastjson.serializer.SerializerFeature">
                        <!-- 避免循环引用 -->
                        <value>DisableCircularReferenceDetect</value>
                        <!-- 是否输出值为null的字段 -->
                        <value>WriteMapNullValue</value>
                        <!-- <value>QuoteFieldNames</value>-->
                         <!-- 数值字段如果为null,输出为0,而非null -->
                        <!-- <value>WriteNullNumberAsZero</value>-->
                        <!-- 字符类型字段如果为null,输出为"",而非null -->
                        <value>WriteNullStringAsEmpty</value>
                        <!-- List字段如果为null,输出为[],而非null -->
                        <value>WriteNullListAsEmpty</value>
                        <!-- Boolean字段如果为null,输出为false,而非null -->
                        <!-- <value>WriteNullBooleanAsFalse</value>-->
                    </array>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!-- 视图解析器
        作用：1.捕获后端控制器的返回值 =“hello”
              2.解析：在返回值的前后 拼接  ==> "hello.jsp"
    -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/"></property>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"></property>
    </bean>

    <mvc:default-servlet-handler />

</beans>

6.在上一步中，mvc.xml扫描controller的注解 ，在controller中设置路由和控制器对应,新建·userControlller.java·，目录如下图所示：

userController.java内容如下：

package com.qf.web;

import com.github.pagehelper.PageInfo;
import com.qf.bean.BaseResultBean;
import com.qf.entiry.User;
import com.qf.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.text.SimpleDateFormat;
import java.util.List;

@Controller //声明后端控制器
public class UserController {


    @Autowired
    @Qualifier("userServiceImpl")
    private UserService userService;
    @GetMapping("/userlist")
    public ModelAndView queryUsers(HttpServletRequest request){ //service doGet doPost
        int page = Integer.parseInt(request.getParameter("page"));
        int size = Integer.parseInt(request.getParameter("size"));
        List<User> userlists = userService.queryUsers(page,size);
        PageInfo<User> pageInfo = new PageInfo<User>(userlists);
        System.out.println("queryUsers"+userlists);
        System.out.println("pageInfo"+pageInfo);

        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("users",userlists
        );
        modelAndView.setViewName("user");
//
        return modelAndView;
    }

    @RequestMapping("/user")
    @ResponseBody
    public Object queryOne(Integer id)
    {
        System.out.println("query user id:"+id);
        List<User> user = userService.queryOne(id);
        System.out.println(user);
        return user;
    }
    @PostMapping("/update")
    public BaseResultBean updateUser(User user)
    {
        System.out.println("update user" + user);
        userService.updateUser(user);
        BaseResultBean baseResultBean = new BaseResultBean();
        baseResultBean.setStatus(true);
        baseResultBean.setMessage("成功");
        return  baseResultBean;
    }

    @RequestMapping("/add")
    public BaseResultBean addUser(User user)
    {
        System.out.println("add user" + user);
        userService.insertUser(user);
        BaseResultBean baseResultBean = new BaseResultBean();
        baseResultBean.setStatus(true);
        baseResultBean.setMessage("成功");
        return  baseResultBean;
    }

    @RequestMapping("/deleteuser/{id}")
    public BaseResultBean deleteUser(@PathVariable Integer id)
    {
        System.out.println("delete user" + id);
        userService.deleteUser(id);
        BaseResultBean baseResultBean = new BaseResultBean();
        baseResultBean.setStatus(true);
        baseResultBean.setMessage("成功");
        return  baseResultBean;
    }


}

7.第五步中spring的配置文件applicationContext.xml如下所示

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop http://www.springframework.org/schema/aop/spring-aop.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- Datasource -->
    <context:property-placeholder location="classpath:jdbc.properties" />
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init">
        <property name="driverClassName" value="${jdbc.driverClass}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="60000"/>
        <!-- 配置一个 连接在池中最小生存的时间 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
    </bean>

    <!-- SqlSessionFactory  -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 注入dao-mapper文件信息,如果映射文件和dao接口 同包且同名，此配置可忽略 -->
        <property name="mapperLocations">
            <list>
                <value>classpath:com/qf/dao/*.xml</value>
            </list>
        </property>

        <!-- 自动扫描mybatis配置文件,打印sql日志 -->
        <property name="configLocation" value="classpath:sqlLog.xml"></property>
        <!-- 扫描entity包 使用别名
           为dao-mapper文件中的实体 定义缺省包路径
           如：<select id="queryAll" resultType="User"> 中User类可以不定义包
           -->
        <property name="typeAliasesPackage" value="com.qf.entiry"></property>

        <!-- 分页 -->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <!-- 设置页号，调整到合理的值 100页-->
                            <prop key="reasonable">true</prop>
                        </props>
                    </property>
                </bean>
            </array>
        </property>

    </bean>

<!--    配置扫描Dao接口包，动态实现Dao接口，注入到ioc容器中-->
    <!--  DAO MapperScannerConfigurer -->
    <bean id="mapperScannerConfigurer9" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- dao接口所在的包 如果有多个包 也可以用逗号或者分号分割 -->
        <property name="basePackage" value="com.qf.dao"></property>
    <!--  如果工厂中只有一个SqlSessionFactory的bean,  此配置可忽略    -->
    <!--        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>-->
    </bean>

    <!-- 读取注解位置  所有的类都要扫描，但是controller类不扫描 -->
    <context:component-scan base-package="com.qf" use-default-filters="true">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 引入一个事务管理器，其中依赖DataSource,借以获得连接，进而控制事务逻辑 -->
    <bean id="tx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--  @Transactional -->
    <tx:annotation-driven transaction-manager="tx" />
</beans>

路虽远，行则将至

8.spring.xml会读取dao层,service层下面的注解，内容如下：

不知道原理，写不去了…