132、【JavaEE】【SSM】Spring + Spring

作者: yscyber | 来源:发表于2021-11-01 03:36 被阅读0次

132、【JavaEE】【SSM】Spring + Spring
互联网轻量级SSM框架解密：Spring、Spring MVC、
整合SSM框架
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131、【JavaEE】【SSM】Spring + MyBati

1、概述

Spring 与 Spring MVC 严格意义上说是不需要整合的。但由于 Spring MVC 是一个 Web 框架，所以“整合”的含义是将 Spring 与 Web 体系进行整合，更确切的说，在 Web 容器启动时，Spring 容器同时加载；在 Web 容器销毁时，Spring 容器同时销毁。

2、整合步骤

2.1、

131、【JavaEE】【SSM】Spring + MyBatis

2.2、

确保 Maven 工程为 Maven Web 工程。

2.3、Spring MVC

1、导入 Maven 依赖

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.8</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.3</version>
        </dependency>

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>

2、在src/main/resources目录下，创建 Spring MVC 核心配置文件springmvc.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">

    <!-- Spring MVC 的配置文件只负责 Controller 部分的注解扫描即可 -->
    <context:component-scan base-package="com.yscyber.ssm.controller"/>

    <!-- JSON -->
    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <mvc:default-servlet-handler/>

</beans>

3、在 Java Web 工程的配置文件web.xml（src/main/webapp/WEB-INF/web.xml）中配置前端控制器等 Spring MVC 的组件（加载 Spring MVC 核心配置文件）

<?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">
    
    <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:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

2.4、Spring

将 Spring 容器与 Web 容器“整合”，借助监听器，让 Web 容器启动的时候自动加载 Spring 配置文件，Web 容器销毁的时候 Spring 的 IOC 容器也销毁。
在web.xml中配置监听器

<?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">
    
    <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:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <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>

2.5、测试

CREATE TABLE xxx(
  id INT NOT NULL,
  name VARCHAR(3) NOT NULL
);

package com.yscyber.ssm.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@NoArgsConstructor
@AllArgsConstructor
@Data
@ToString
public class MyObj {

    private Integer id;

    private String name;

}

package com.yscyber.ssm.repo;

import com.yscyber.ssm.pojo.MyObj;

import java.util.List;

public interface MyObjRepo {

    List<MyObj> listAllMyObjs();

}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.yscyber.ssm.repo.MyObjRepo">
    <select id="listAllMyObjs" resultType="MyObj" >
        SELECT id,name
        FROM xxx
    </select>
</mapper>

package com.yscyber.ssm.service;

import com.yscyber.ssm.pojo.MyObj;

import java.util.List;

public interface MyObjService {

    List<MyObj> listAllObjs();

}

package com.yscyber.ssm.service.impl;

import com.yscyber.ssm.pojo.MyObj;
import com.yscyber.ssm.repo.MyObjRepo;
import com.yscyber.ssm.service.MyObjService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class MyObjServiceImpl implements MyObjService {

    @Autowired
    private MyObjRepo myObjRepo;

    @Override
    public List<MyObj> listAllObjs() {
        return myObjRepo.listAllMyObjs();
    }

}

package com.yscyber.ssm.controller;

import com.yscyber.ssm.pojo.MyObj;
import com.yscyber.ssm.service.MyObjService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
public class MyObjController {

    @Autowired
    private MyObjService myObjService;

    @GetMapping("/myobj/all")
    @ResponseBody
    public List<MyObj> listAllMyObjsApi() {
        return myObjService.listAllObjs();
    }

}

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