整合SSM

整合SSM

整合顺序：

  1. 先写mybatis
  2. 再写spring
  3. 再写springmvc

导入Maven依赖

    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- lombok，可以自动帮我们生成get和set以及无参有参构造。在数据库数据经常改的时候用很方便
			@Data
			@AllArgsConstructor
			@NoArgsConstructor
 		-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>
	<!-- Maven资源过滤设置 -->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

建立基本的包和框架

com.mao.model

存放实体类

com.mao.dao

跟数据库打交道的类，和mybatis局部配置文件image-20220316164750016

<!-- namespace一定要写 -->
<mapper namespace="com.mao.dao.UserMapper">
    <select id="selectAll" resultType="User">
        select * from User
    </select>
</mapper>

com.mao.service

com.mao.controller

mybatis-config.xml mybatis主配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 別名的配置必须放到配置标签中的第一行，不然会报错（配置的是局部配置中返回类型的别名） -->
    <typeAliases>
        <!-- type：表示的是某一个实体类的具体路径，alias代表具体路径的别名 -->
        <typeAlias type="com.mao.model.User" alias="User"/>
    </typeAliases>

    <!--
        可以通过mapper标签将主配置文件mybatis.xml和局部配置文件关联起来
        resource：是局部配置文件的路径，路径从包开始的
     -->
    <mappers>
        <mapper resource="com/mao/dao/UserMapper.xml"/>
    </mappers>
</configuration>

applicationContext.xml spring主配置文件

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

</beans>

database.properties 数据库配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springmvc?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

web.xml

这里首先要右键项目，添加web支持，才能生成web.xml文件

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
 
 	
<!--  	servletConfig 读取当前servlet里面的init-param -->

<!--  	setvletContext 读取web.xml配置的context-param -->
	<servlet>
		<servlet-name>DispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<!-- spring里面的配置文件 -->
			<!--<param-value>classpath:applicationContext.xml</param-value> -->
            <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->  
			<!-- springMVC里面的spring-mvc.xml配置文件 -->
			<param-value>classpath:spring-mvc.xml</param-value>
		</init-param>
		<!-- 指定servlet启动的优先级。1-5,越小优先级就越高 将Servlet的启动提前至服务器启动前 -->
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- 在SpringMVC中，	‘/’ 和 ‘/*’ 的区别
	/：只匹配所有的请求，不会去匹配jsp	一般写‘/’就可以了
	/*：匹配所有的请求，包括jsp
	-->	
	<servlet-mapping>
		<servlet-name>DispatcherServlet</servlet-name>
		<!-- "/"  表示当前项目下面所有的静态资源(css,js, html,image,properties,xml),但servlet除外 -->
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<!-- <servlet-mapping>
		<servlet-name>springDispatcherServlet</servlet-name>
		<url-pattern>/*</url-pattern>
	</servlet-mapping> -->
	
	<!-- 解决提交乱码问题 -->
	<filter>  
        <filter-name>characterEncodingFilter</filter-name>  
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>utf8</param-value>  
        </init-param>  
        <init-param>  
            <param-name>forceEncoding</param-name>  
            <param-value>true</param-value>  
        </init-param>  
 	</filter>  
	<filter-mapping>  
        <filter-name>characterEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
 	</filter-mapping>
    
    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

spring-mvc.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		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-3.2.xsd">

    <!-- 配置SpringMVC -->
    <!-- 1.开启SpringMVC注解驱动 -->
    <mvc:annotation-driven />
    <!-- 2.静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>
	<!-- 3.配置视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
	</bean>
    <!-- spring-dao.xml -->
	<!-- 关联数据库文件 -->
    <context:property-placeholder location="classpath:database.properties"/>
	<!-- 4.配置数据源  c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）-->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
       <!-- 配置事务管理器 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <!-- 注入数据库连接池 -->
       <property name="dataSource" ref="dataSource" />
	</bean>
    
	<!-- 5.配置SqlSessionFactory对象 mybatis需要 -->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <!-- 注入数据库连接池 -->
       <property name="dataSource" ref="dataSource"/>
       <!-- 配置MyBatis全局配置文件:mybatis-config.xml -->
       <property name="configLocation" value="classpath:mybatis-config.xml"/>
   </bean>
    
   <!-- 6.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
   <!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
   <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <!-- 注入sqlSessionFactory -->
       <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
       <!-- 给出需要扫描Dao接口包 -->
       <property name="basePackage" value="com.mao.dao"/>
   </bean>
    
	    <!-- 7.扫描web相关的bean -->
    <context:component-scan base-package="com.mao.*"/>	
</beans>

image-20220316135907800

UserPage.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<%@page import="java.util.*,java.sql.*"
        contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>This is User page !!!</title>
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>用户列表 —— 显示所有用户</small>
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>序号</th>
                    <th>用户账号</th>
                    <th>真实姓名</th>
                    <th>手机号码</th>
                    <th>QQ</th>
                    <th>微信号</th>
                    <th>状态</th>
                </tr>
                </thead>
                <tbody>
                <c:forEach var="user" items="${userlist}">
                    <tr>
                        <td>${user.id}</td>
                        <td>${user.userAccount}</td>
                        <td>${user.userName}</td>
                        <td>${user.userNumber}</td>
                        <td>${user.userQq}</td>
                        <td>${user.userVx}</td>
                        <td>${user.userState}</td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

</body>
</html>

${pageContext.request.contextPath}获取当前项目绝对路径

注意：

使用注解@Component 创建的bean是与类同名首字母小写的bean
记得检查发布的项目下WEB-INF是否有lib包，因为在发布的时候需要image-20220316164945955

碰到的问题：

使用json传参

  • ​ 记得进行乱码的处理 一种是单个处理，一种是统一处理

  • @RequestMapping(value="/queryUser",produces ="application/json;charset=utf-8")

  • <mvc:annotation-driven>
   <mvc:message-converters register-defaults="true">
       <bean class="org.springframework.http.converter.StringHttpMessageConverter">
           <constructor-arg value="UTF-8"/>
       </bean>
       <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
           <property name="objectMapper">
               <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                   <property name="failOnEmptyBeans" value="false"/>
               </bean>
           </property>
       </bean>
   </mvc:message-converters>
</mvc:annotation-driven>
隐藏域
  • 在进行数据修改的时候，老是不成功，明明数据都获取到了，打印出来也没错。后面才发现必须要传一个id进去，这里就提到了一个新知识：隐藏域，要通过下面这种方法将id也传过去。
axios响应的时候
  • //前端
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script type="text/javascript">
    let userAccount = document.getElementById("userAccount");
    document.getElementById("queryUser").onclick=function(){
        axios.post("${pageContext.request.contextPath}/user/queryUser","userAccount="+userAccount.value
        ).then(function(response) {
            console.log(response);
            <c:set scope="request" var="userlist" value="response"/>
        }, function(err) {
            console.log(err);
        })
    }
</script>

  • //后端
	@RequestMapping(value="/queryUser")
	//能够直接将controller返回的bean对象或map对象等自动进行json或xml格式的转换
	//也可以直接在Controller类上使用@RestController，这样所有方法都只会返回json字符串了
    @ResponseBody
	//解决ajax跨域的问题
    @CrossOrigin
    public String  queryUser(Model model,@RequestParam String userAccount) throws JsonProcessingException {
        List<User> list = userService.vagueSelect(userAccount);
        System.out.println(list);
//        model.addAttribute("userlist", list);
//        return list;
        //创建一个jackson的对象映射器，用来解析数据
        ObjectMapper mapper = new ObjectMapper();
        //将我们的对象解析成为json格式
        String str = mapper.writeValueAsString(list);
        //由于@ResponseBody注解，这里会将str转成json格式返回；十分方便
        return str;
    }

  • 【编程不良人】axios 异步请求技术,已完结_哔哩哔哩_bilibili

项目结构图：

项目结构

posted @ 2022-03-20 15:41  没有烦恼的猫猫  阅读(31)  评论(0)  编辑  收藏  举报