SpringMvc整合笔记

SSM整合步骤
- 导入依赖
- 编写配置文件
Thymeleaf

SSM整合步骤

导入依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>
<!-- mybatis -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.6</version>
</dependency>
<!-- mybatis-spring:整合依赖 -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.2</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.38</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.12</version>
</dependency>
<!-- spring-jdbc:使用的是spring-jdbc的事务 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>
<!-- spring-tx:事务管理器 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>

编写配置文件

web.xml

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <filter>
    <filter-name>encodingFilter</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>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mybatis.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

spring-mybatis.xml

<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: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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--扫描所有的包-->
    <context:component-scan base-package="com.qianfeng"></context:component-scan>
    <!--导入spring-mvc.xml-->
    <import resource="classpath:spring-mvc.xml"/>
    <!--配置druid数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/db_mybatis_test"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>
    <!--配置sqlsessionnFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!--配置mapper文件所在位置-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
        <!--单独的mybatis配置文件用来补充我mybatis没配的东西-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>
    <!--mapper扫描配置器：配置dao接口所在的包，会帮助我们自动生成对应虚拟实现类，
    建立实现类与对应的mapper文件的联系-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.qianfeng.dao"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>
    <!--配置事务管理器:spring-jdbc的事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--配置注解驱动式  声明事务管理-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

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/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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.qianfeng.controller"></context:component-scan>
    <!--静态资源处理器；释放静态资源-->
    <mvc:default-servlet-handler/>
    <!--
        注解驱动标签:将前端请求与后端controller中的映射匹配
    -->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="false">
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=utf-8</value>
                        <!--为了避免低版本ie浏览器获取json数据时出现文件下载的情况-->
                        <value>text/html;charset=utf-8</value>
                    </list>
                </property>
                <!--解决当属性为null时，如何返回数据-->
                <property name="features">
                    <list>
                        <value>WriteNullNumberAsZero</value>
                        <value>WriteNullStringAsEmpty</value>
                        <value>WriteNullListAsEmpty</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

</beans>

mybatis-config,xml

<?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>
    <!--打印执行的SQL语句-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <typeAliases>
        <!--实体类别名-->
        <package name="com.qianfeng.pojo"></package>
    </typeAliases>
</configuration>

测试查询所有用户

/**
     * 查询用户列表
     */
@RequestMapping("/list")
@ResponseBody
public List<User> getUserList(){
    List<User> userList = userService.getUserList();
    return userList;
}

添加用户

-------------------------UserController------------------------------
@RequestMapping("/add")
@ResponseBody
public String add(){
    User user = new User();
    user.setUserName("杜兰特");
    userService.addUser(user);
    return "success";
}
-------------------------UserServiceImpl------------------------------
@Service
@Transactional    //加了此注解，在同一个事务中运行功能时，如果某一个出现问题，会自动回滚
public class UserServiceImpl implements UserService {

    @Resource
    private UserDao userDao;
    
    /**
     * 测试事务自动回滚
     * @param user
     */
    @Override
    public void addUser(User user) {
        //张三给李四转账1000:
        userDao.addUser(user);//张三扣1000
        int num = 1/0;
        userDao.addUser(user);//李四加1000
    }
}

添加@Transactional在增删改出错时可以自动回滚⭐⭐⭐⭐⭐⭐⭐

Thymeleaf

前言：如果你只会ajax的话，不建议你直接用html,因为ajax拿到的数据给html标签赋值的时候非常不方便。我们之前学过jsp,可以直接把后端的数据放在标签外面进行for循环、if判断等等。但是jsp有点儿老了，所以我们使用更好的thymeleaf替换jsp进行页面数据显示。
thymeleaf相对jsp的优势：jsp对于前端不友好，有大量的java代码，jsp不能单独运行，必须依赖于后端服务器，前端测试也比较麻烦。所以我们使用thymeleaf,都是html页面。是一种比jsp更好的模板引擎，也是springboot官方推荐的模板引擎。

步骤

<!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf -->
<dependency>
    <groupId>org.thymeleaf</groupId>
    <artifactId>thymeleaf</artifactId>
    <version>3.0.11.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf-spring4 -->
<dependency>
    <groupId>org.thymeleaf</groupId>
    <artifactId>thymeleaf-spring4</artifactId>
    <version>3.0.9.RELEASE</version>
</dependency>

spring-mvc.xml

<!--模板解析器-->
<bean id="templateResolver" class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
    <property name="prefix" value="/WEB-INF/pages/"></property>
    <property name="suffix" value=".html"></property>
    <property name="characterEncoding" value="utf-8"></property>
    <property name="templateMode" value="HTML5"></property>
    <property name="cacheable" value="false"></property>
</bean>
<!--模板引擎-->
<bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine">
    <property name="templateResolver" ref="templateResolver"></property>
</bean>
<!--视图解析器-->
<bean id="viewResolver" class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
    <property name="characterEncoding" value="utf-8"></property>
    <property name="templateEngine" ref="templateEngine"></property>
</bean>

这里是SSM和Thymeleaf配置的代码，不是springboot⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

测试

@Controller
public class ThymeleafController {

    /**
     * 测试thymeleaf页面传值
     */
    @RequestMapping("/test_thymeleaf")
    public String test(Model model){
        String msg = "嘻嘻";
        model.addAttribute("msg1111",msg);
        return "userlist";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!--
        th:text:值在标签内部文本显示的使用th:text赋值
    -->
    <h1 th:text="${msg1111}">哈哈</h1>
    <input  type="text" th:value="${msg1111}">
</body>
</html>

posted @ 2021-08-05 09:07 慢慢呀阅读(46) 评论(0) 收藏举报

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SpringMvc整合笔记

SSM整合步骤

导入依赖

编写配置文件

web.xml

spring-mybatis.xml

spring-mvc.xml

mybatis-config,xml

测试查询所有用户

添加用户

Thymeleaf

步骤

spring-mvc.xml

测试

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