SSM框架之Mybatis

0. 老版本Spring官方文档 https://docs.spring.io/spring-framework/docs/4.3.24.RELEASE/spring-framework-reference/html/

1. SpringMVC

2. HelloSpringMVC 配置版本springmvc-02-mymvc

• 2.1. 新建一个module，添加web支持！

• 2.2. 确定导入了SpringMVC的依赖！

<?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>com.xiaofan</groupId>
    <artifactId>SpringMVC</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>springmvc-01-servlet</module>
        <module>springmvc-02-mymvc</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <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>
    </dependencies>

</project>

• 2.3. 配置web.xml， 注册DispatcherServlet！

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">
    <!--配置DispatcherServlet： 这个是SpringMVC的核心，请求分发器，前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--DispatcherServlet要绑定spring的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别 1-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--/: 只匹配所有的请求，不会去匹配jsp页面-->
    <!--/*: 配所有的请求，包括jsp页面-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

• 2.4. 编写SpringMVC的配置文件 springmvc-servlet.xml : [servletname]-servlet.xml 说明，这里的名称是按照官方来的

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--处理器映射器-->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <!--处理器适配器-->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
    <!--处理器解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--BeanNameUrlHandlerMapping:bean-->
    <bean id="/hello" class="com.xiaofan.controller.HelloController"/>
</beans>

• 2.5. 添加处理映射器

• 2.6. 添加处理器适配器

• 2.7. 添加视图解析器

• 2.8. 编写我们要操作业务Controller，要么实现Controller接口， 要么增加注解；需要返回一个ModelAndView，装数据，封视图；

package com.xiaofan.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView modelAndView = new ModelAndView();

        // 业务代码
        String result = "hello springmvc!";
        modelAndView.addObject("msg", result);
        // 跳转视图
        modelAndView.setViewName("test");

        return modelAndView;
    }
}

• 2.9. 将自己的类交给SpringIOC容器，注册bean
• 2.10. 写需要跳转的jsp页面，显示ModelandView存放的数据，以及我们的正常页面；
• 2.11. 配置Tomcat启动测试！

3. SpringMVC执行原理

4. SpringMVC注解版本springmvc-03-annotation

• web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">
    <!--配置DispatcherServlet： 这个是SpringMVC的核心，请求分发器，前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--DispatcherServlet要绑定spring的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别 1-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--/: 只匹配所有的请求，不会去匹配jsp页面-->
    <!--/*: 配所有的请求，包括jsp页面-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

• springmvc-servlet.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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--自动扫描包， 让指定包下的注解生效，由IOC容器统一管理-->
    <context:component-scan base-package="com.xiaofan.controller"/>
    <!--让Spring MVC不处理静态资源 .css .js .html .mp3 .mp4-->
    <mvc:default-servlet-handler />
    <!--支持mvc注解驱动
        在spring中一般采用@RequestMapping注解完成映射关系， 要想使@RequestMapping注解生效，必须向上下文注册DefaultAnnotationHandlerMapping
        和一个AnnotationMethodHandlerAdapter实例，这两个实例分别在类级别和方法级别处理， 而annotation-driven配置帮助我们自动完成上述两个实例的注入-->
    <mvc:annotation-driven />

    <!--处理器解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

• HelloController.java

package com.xiaofan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {

    @RequestMapping("/hello")
    public String hello(Model model) {
        // 封装数据
        model.addAttribute("msg", "hello SpringMVCAnnotation!");
        // 会被视图解析器处理
        return "hello";
    }
}

• hello.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

5. RestFul 风格springmvc-04-controller

package com.xiaofan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class RestFulController {

    // http://localhost:8080/springmvc_04_controller_war_exploded/add/1/22

    @GetMapping("/add/{a}/{b}")
    public String test1(@PathVariable int a, @PathVariable int b, Model model) {
        int res = a + b;
        model.addAttribute("msg", "结果为1：" + res);
        return "test";
    }

    @PostMapping("/add/{a}/{b}")
    public String test2(@PathVariable int a, @PathVariable int b, Model model) {
        int res = a + b;
        model.addAttribute("msg", "结果为2：" + res);
        return "test";
    }
}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%--模仿post方式 RestFul风格提交--%>
<form action="/springmvc_04_controller_war_exploded/add/1/20" method="post">
    <input type="submit">
</form>
</body>
</html>

6. 转发和重定向

• 无视图解析器

• 有视图解析器

7. 接收请求数据及数据回显

package com.xiaofan.controller;

import com.xiaofan.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
@RequestMapping("/user")
public class UserController {

    // localhost:8080/user/t1?username=xxx
    @GetMapping("/t1")
    public String test1(@RequestParam("username") String name, Model model) {

        System.out.println("接收到的前端参数：" + name);

        model.addAttribute("msg", name);

        return "test";
    }

    // 接收一个对象 http://localhost:8080/springmvc_04_controller_war_exploded/user/t2?name=xiaofan&age=3&id=999
    @GetMapping("/t2")
    public String test2(User user, Model model) {

        System.out.println("接收到的前端参数：" + user);

        model.addAttribute("msg", user);

        return "test";
    }
}

8. 乱码问题解决

• 配置spring过滤器

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">
    <!--配置DispatcherServlet： 这个是SpringMVC的核心，请求分发器，前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--DispatcherServlet要绑定spring的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别 1-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--/: 只匹配所有的请求，不会去匹配jsp页面-->
    <!--/*: 配所有的请求，包括jsp页面-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--配饰SpringMVC的乱码过滤-->
    <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>

</web-app>

• form.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="/e/t1" method="post">
        <input type="text" name="name">
        <input type="submit"/>
    </form>
</body>
</html>

• EncodingController.java

package com.xiaofan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PostMapping;

@Controller
public class EncodingController {


    // 过滤器解决乱码
    @PostMapping("/e/t1")
    public String test1(String name, Model model) {
        System.out.println(name);
        model.addAttribute("msg", name);
        return "test";
    }
}

• tomcat.server

<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443"
           URIEncoding="utf-8"/>

9. JSONspringmvc-05-json

• fastjson

• json乱码问题

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--自动扫描包， 让指定包下的注解生效，由IOC容器统一管理-->
    <context:component-scan base-package="com.xiaofan.controller"/>
    <!--让Spring MVC不处理静态资源 .css .js .html .mp3 .mp4-->
    <mvc:default-servlet-handler />
    <!--支持mvc注解驱动
        在spring中一般采用@RequestMapping注解完成映射关系， 要想使@RequestMapping注解生效，必须向上下文注册DefaultAnnotationHandlerMapping
        和一个AnnotationMethodHandlerAdapter实例，这两个实例分别在类级别和方法级别处理， 而annotation-driven配置帮助我们自动完成上述两个实例的注入-->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!--处理器解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

10. 拦截器springmvc-07-interceptor

11. 文件上传下载