IDEA+Maven+SSM框架实现的简单的增、删、改、查

IDEA+Maven+SSM框架实现的简单的增、删、改、查

选用SSM框架的原因

在目前的企业级Java应用中，Spring框架是必须的。Struts2框架与Spring的整合问题日益凸显，而Spring MVC作为新一代的MVC框架，因其可以与Spring框架无缝整合的特性收到了越来越多的欢迎。Hibernate框架在面对需要存储过程或者复杂SQL时显得力不从心，不能提供高效的数据库控制。而Mybatis框架作为持久层的框架，虽然需要自己编写SQL语句，但是其对高并发高响应的支持，以及对动态SQL和动态绑定的支持使其脱颖而出。

因此SSM框架（Spring + Spring MVC +Mybatis）逐渐取代了之前广泛使用的SSH框架（Spring + Struts2 + Hibernate），成为了目前使用最多的框架。

本文使用IDEA，利用Maven管理项目，整合SSM框架搭建论文管理系统，实现简单的增、删、改、查功能。步骤详细，讲解丰富，适合新手入门。
开发工具

    IntelliJ IDEA Ultimate 2017.2.2
    Apache-tomcat-9.0.5
    JDK 1.8.0_121
    MySQL 5.7
    Maven 3.3.9

工程结构

最终完成后的工程结构：

下面开始详细的讲解项目的开发过程。
IDEA+Maven搭建项目骨架

1. 新建Maven项目：
点击File -> New -> Project -> Maven -> 勾选 Create from archetype -> 选择 maven-archetype-webapp (注意：此处不要错选成上面的cocoom-22-archetype-webapp)
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在弹出的new project 选项卡中填写GroupId和Artifactid，其中GroupID是项目组织唯一的标识符，实际对应JAVA的包的结构，是main目录里java的目录结构，ArtifactID是项目的唯一的标识符，实际对应项目的名称，就是项目根目录的名称。对于入门练习，这两项可以随意填写。

这里写图片描述
之后点击next 选择Maven版本（其中IDEA 专业版自带Maven，也可以选择自己下载的maven）。之后填写项目名称和项目地址，完成后点击Finish，完成项目骨架的创建。
这里写图片描述

.

2. 在新建的项目中添加所需要的文件/文件夹

创建之后的项目如图所示，我们需要在这之上新建一些目录。
这里写图片描述

在项目的根目录下新建target文件夹，系统自动将其设置为“Excluded”
这里写图片描述
在src/main目录下新建Directory：“java”，并将其设置为“Source Root”（即：此项目默认的代码文件源目录）
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在刚才新建的java文件下新建“com”包，再在com包下新建四个包，分别命名为：pojo,service,dao,controller。（如果出现下图中所示的包名重叠的情况，可以点击图中所示的图标，将“Hide empty middle package取消掉”）
这里写图片描述
上面新建的四个包：pojo,service,dao,controller，其所存放的分别是：

    pojo: 存放自定义的java类。如：paper类，user类，book类等，每个类的属性设为private，并提供public属性的getter/setter方法让外界访问
    service：定义接口，包含系统所提供的功能。（之后还会在service包下再新建impl包）。
    dao：定义接口，包含与数据库进行交互的功能。
    controller：控制器，负责接收页面请求，转发和处理。

在resource包下新建Directory：“mapper”（用于存放xxxMapper.xml文件）和“spring”（用于存放spring-xxx.xml配置文件），新建文件：“jdbc.properties”（mysql数据库配置文件）,”log4j.properties”（日志输出配置文件）,”mybatis-config.xml”（mybatis框架配置文件）。
这里写图片描述
在web-inf目录下新建“jsp”包，存放xxx.jsp显示界面。
补充之后的项目目录如下图所示，至此项目骨架搭建完毕，开始写代码实现增删改查功能。
这里写图片描述

3. 自定义Paper类

在这之前要对项目的pom.xml文件进行配置，在此文件中配置项目所需要的jar包。

pom.xml

    <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/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com</groupId>
        <artifactId>first</artifactId>
        <packaging>war</packaging>
        <version>1.0-SNAPSHOT</version>
        <name>first Maven Webapp</name>
        <url>http://maven.apache.org</url>
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <spring.version>5.0.3.RELEASE</spring.version>
            <mybatis.version>3.4.4</mybatis.version>
        </properties>
        <dependencies>
            <!-- 单元测试 -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>
            <!-- 第一部分：Spring 配置-->
            <!-- Spring core -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- Spring DAO -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- Spring mvc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- 第二部分：Servlet web -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.0.1</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.2</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <dependency>
                <groupId>taglibs</groupId>
                <artifactId>standard</artifactId>
                <version>1.1.2</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.9.4</version>
            </dependency>
            <!-- 第三部分：数据库和mybatis -->
            <!-- 数据库 -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.38</version>
            </dependency>
            <!-- 数据库连接池 -->
            <dependency>
                <groupId>com.mchange</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.5.2</version>
            </dependency>
            <!-- MyBatis -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
            <!-- mybatis-spring整合包 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>1.3.1</version>
            </dependency>
            <!-- 第四部分：日志 -->
            <!-- 实现slf4j接口并整合 -->
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.1.1</version>
            </dependency>
        </dependencies>
        <build>
            <finalName>first</finalName>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

本项目所用的数据库为MySQL 5.7 建表语句如下：

     
    SET FOREIGN_KEY_CHECKS=0;
     
    -- ----------------------------
    -- Table structure for `paper`
    -- ----------------------------
    DROP TABLE IF EXISTS `paper`;
    CREATE TABLE `paper` (
      `paper_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'paperID',
      `name` varchar(100) NOT NULL COMMENT 'paper名称',
      `number` int(11) NOT NULL COMMENT 'paper数量',
      `detail` varchar(200) NOT NULL COMMENT 'paper描述',
      PRIMARY KEY (`paper_id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8 COMMENT='paper表';
     
    -- ----------------------------
    -- Records of paper
    -- ----------------------------
    INSERT INTO `paper` VALUES ('1', '机器学习', '2', 'mlmlmlml');
    INSERT INTO `paper` VALUES ('2', '深度学习', '3', 'dldldl');
    INSERT INTO `paper` VALUES ('3', '大数据', '4', 'bdbdbd');

    始写java代码：

    在pojo包中新建Paper.java

    package com.pojo;
     
    public class Paper {
        private long paperId;
        private String paperName;
        private int paperNum;
        private String paperDetail;
     
        public long getPaperId() {
            return paperId;
        }
     
        public void setPaperId(long paperId) {
            this.paperId = paperId;
        }
     
        public String getPaperName() {
            return paperName;
        }
     
        public void setPaperName(String paperName) {
            this.paperName = paperName;
        }
     
        public int getPaperNum() {
            return paperNum;
        }
     
        public void setPaperNum(int paperNum) {
            this.paperNum = paperNum;
        }
     
        public String getPaperDetail() {
            return paperDetail;
        }
     
        public void setPaperDetail(String paperDetail) {
            this.paperDetail = paperDetail;
        }
     
    }

其中getter/setter方法可以在定义完私有属性之后使用IDEA提供的快捷键：ALT+Insert 来实现快速添加
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    在service包中新建接口 PaperService：

    package com.service;
     
    import com.pojo.Paper;
     
    import java.util.List;
     
    public interface PaperService {
        int addPaper(Paper paper);
     
        int deletePaperById(long id);
     
        int updatePaper(Paper paper);
     
        Paper queryById(long id);
     
        List<Paper> queryAllPaper();
    }

    在service包下新建impl包，并在此包中新建PaperServiceImpl.java

    package com.service.impl;
     
    import com.pojo.Paper;
    import com.dao.PaperDao;
    import com.service.PaperService;
     
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
     
    import java.util.List;
     
    @Service
    public class PaperServiceImpl implements PaperService {
        @Autowired
        private PaperDao paperDao;
     
        @Override
        public int addPaper(Paper paper) {
            return paperDao.addPaper(paper);
        }
     
        @Override
        public int deletePaperById(long id) {
            return paperDao.deletePaperById(id);
        }
     
        @Override
        public int updatePaper(Paper paper) {
            return paperDao.updatePaper(paper);
        }
     
        @Override
        public Paper queryById(long id) {
            return paperDao.queryById(id);
        }
     
        @Override
        public List<Paper> queryAllPaper() {
            return paperDao.queryAllPaper();
        }
     
    }

    在dao包中新建接口 PaperDao.java

    package com.dao;
     
    import com.pojo.Paper;
     
    import java.util.List;
     
    public interface PaperDao {
        int addPaper(Paper paper);
     
        int deletePaperById(long id);
     
        int updatePaper(Paper paper);
     
        Paper queryById(long id);
     
        List<Paper> queryAllPaper();
     
     
    }

    在controller包中新建 PaperController.java

    package com.controller;
     
    import com.pojo.Paper;
    import com.service.PaperService;
     
    import java.util.List;
     
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
     
    @Controller
    @RequestMapping("/paper")
    public class PaperController {
        @Autowired
        private PaperService paperService;
     
        @RequestMapping("/allPaper")
        public String list(Model model) {
            List<Paper> list = paperService.queryAllPaper();
            model.addAttribute("list", list);
            return "allPaper";
        }
     
        @RequestMapping("toAddPaper")
        public String toAddPaper() {
            return "addPaper";
        }
     
        @RequestMapping("/addPaper")
        public String addPaper(Paper paper) {
            paperService.addPaper(paper);
            return "redirect:/paper/allPaper";
        }
     
        @RequestMapping("/del/{paperId}")
        public String deletePaper(@PathVariable("paperId") Long id) {
            paperService.deletePaperById(id);
            return "redirect:/paper/allPaper";
        }
     
        @RequestMapping("toUpdatePaper")
        public String toUpdatePaper(Model model, Long id) {
            model.addAttribute("paper", paperService.queryById(id));
            return "updatePaper";
        }
     
        @RequestMapping("/updatePaper")
        public String updatePaper(Model model, Paper paper) {
            paperService.updatePaper(paper);
            paper = paperService.queryById(paper.getPaperId());
            model.addAttribute("paper", paper);
            return "redirect:/paper/allPaper";
        }
    }
     
     

    在resource/mapper包下新建 PaperMapper.xml（mybatis框架mapper代理开发配置文件）

    <?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.dao.PaperDao">
        <resultMap type="Paper" id="paperResultMap" >
            <id property="paperId" column="paper_id"/>
            <result property="paperName" column="name"/>
            <result property="paperNum" column="number"/>
            <result property="paperDetail" column="detail"/>
        </resultMap>
        <insert id="addPaper" parameterType="Paper">
            INSERT INTO paper(paper_id,name,number,detail) VALUE (#{paperId},#{paperName}, #{paperNum}, #{paperDetail})
        </insert>
     
        <delete id="deletePaperById" parameterType="long">
            DELETE FROM paper WHERE paper_id=#{paperID}
        </delete>
     
        <update id="updatePaper" parameterType="Paper">
            UPDATE paper
            SET NAME = #{paperName},NUMBER = #{paperNum},detail = #{paperDetail}
            WHERE  paper_id = #{paperId}
        </update>
     
        <select id="queryById" resultType="Paper" parameterType="long">
            SELECT paper_id,name,number,detail
            FROM paper
            WHERE paper_id=#{paperId}
        </select>
        <select id="queryAllPaper" resultMap="paperResultMap">
            SELECT paper_id,name,number,detail
            FROM paper
        </select>
     
    </mapper>

    在resource/spring包下分别新建配置文件：spring-dao.xml , spring-mvc.xml , spring-service.xml

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spring-dao.xml：（spring-mybatis整合配置文件）

    <?xml version="1.0" encoding="UTF-8" ?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:context="http://www.springframework.org/schema/context"
           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">
        <!-- 配置整合mybatis过程 -->
        <!-- 1.配置数据库相关参数properties的属性：${url} -->
        <context:property-placeholder location="classpath:jdbc.properties"/>
     
        <!-- 2.数据库连接池 -->
        <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="${jdbc.username}"/>
            <property name="password" value="${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>
     
        <!-- 3.配置SqlSessionFactory对象 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <!-- 注入数据库连接池 -->
            <property name="dataSource" ref="dataSource"/>
            <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            <!-- 扫描pojo包 使用别名 -->
            <property name="typeAliasesPackage" value="com.pojo"/>
            <!-- 扫描sql配置文件:mapper需要的xml文件 -->
            <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        </bean>
     
        <!-- 4.配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
        <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.dao"/>
        </bean>
    </beans>

spring-mvc.xml：（spring mvc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"
           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-3.0.xsd">
        <!-- 配置SpringMVC -->
        <!-- 1.开启SpringMVC注解模式 -->
        <!-- 简化配置：
            (1)自动注册DefaultAnootationHandlerMapping,AnotationMethodHandlerAdapter
            (2)提供一些列：数据绑定，数字和日期的format @NumberFormat, @DateTimeFormat, xml,json默认读写支持
        -->
        <mvc:annotation-driven />
     
        <!-- 2.静态资源默认servlet配置
            (1)加入对静态资源的处理：js,gif,png
            (2)允许使用"/"做整体映射
         -->
        <mvc:default-servlet-handler/>
     
        <!-- 3.配置jsp 显示ViewResolver -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
            <property name="prefix" value="/WEB-INF/jsp/" />
            <property name="suffix" value=".jsp" />
        </bean>
     
        <!-- 4.扫描web相关的bean -->
        <context:component-scan base-package="com.controller" />
    </beans>

spring-service.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: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service包下所有使用注解的类型 -->
        <context:component-scan base-package="com.service" />
     
        <!-- 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>
        <!-- 配置基于注解的声明式事务 -->
        <tx:annotation-driven transaction-manager="transactionManager" />
    </beans>

    在jdbc.properties文件中配置mysql数据库（这里的数据库名、表名，用户名，密码一定要记得修改！！！）。

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/papersystem?useUnicode=true&characterEncoding=utf8
    jdbc.username=root
    jdbc.password=12345678

    在log4j.properties文件中配置日志设定

    log4j.rootLogger=ERROR, stdout
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

    在mybatis-config.xml文件中配置mybtis框架

    <?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>
        <!-- 配置全局属性 -->
        <settings>
            <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
            <setting name="useGeneratedKeys" value="true" />
     
            <!-- 使用列别名替换列名 默认:true -->
            <setting name="useColumnLabel" value="true" />
     
            <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
            <setting name="mapUnderscoreToCamelCase" value="true" />
        </settings>
    </configuration>

    配置web.xml文件

    <!DOCTYPE web-app PUBLIC
                    "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                    "http://java.sun.com/dtd/web-app_2_3.dtd" >
     
    <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_3_1.xsd"
             version="3.1" metadata-complete="true">
    <display-name>Archetype Created Web Application</display-name>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置springMVC需要加载的配置文件
            spring-dao.xml,spring-service.xml,spring-mvc.xml
            Mybatis - > spring -> springmvc
         -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/spring-*.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <!-- 默认匹配所有的请求 -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
        <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>
    </web-app>
     

    修改index.jsp文件

index.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
             pageEncoding="UTF-8" %>
    <%
        pageContext.setAttribute("path", request.getContextPath());
    %>
    <!DOCTYPE HTML>
    <html>
    <head>
        <title>首页</title>
        <style type="text/css">
            a {
                text-decoration: none;
                color: black;
                font-size: 18px;
            }
     
            h3 {
                180px;
                height: 38px;
                margin: 100px auto;
                text-align: center;
                line-height: 38px;
                background: deepskyblue;
                border-radius: 4px;
            }
        </style>
    </head>
    <body>
    <div class="container">
        <div class="row clearfix">
            <div class="col-md-12 column">
                <div class="page-header">
                    <h1>
                        基于SSM框架的管理系统：简单实现增、删、改、查。
                    </h1>
                </div>
            </div>
        </div>
    </div>
    <br><br>
    <h3>
        <a href="${path }/paper/allPaper">点击进入管理页面</a>
    </h3>
    </body>
    </html>

    在WEB-INF/jsp包下分别新建addPaper,jsp , appPaper.jsp , updatePaper.jsp

allPaper.jsp：所有论文显示界面

    <%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2018/4/6
      Time: 16:57
      To change this template use File | Settings | File Templates.
    --%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <% String appPath = request.getContextPath(); %>
    <html>
    <head>
        <title>Paper列表</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 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>
                        基于SSM框架的管理系统：简单实现增、删、改、查。
                    </h1>
                </div>
            </div>
        </div>
     
        <div class="row clearfix">
            <div class="col-md-12 column">
                <div class="page-header">
                    <h1>
                        <small>论文列表 —— 显示所有论文</small>
                    </h1>
                </div>
            </div>
        </div>
        <div class="row">
            <div class="col-md-4 column">
                <a class="btn btn-primary" href="${path}/paper/toAddPaper">新增</a>
            </div>
        </div>
        <div class="row clearfix">
            <div class="col-md-12 column">
                <table class="table table-hover table-striped">
                    <thead>
                    <tr>
                        <th>论文编号</th>
                        <th>论文名字</th>
                        <th>论文数量</th>
                        <th>论文详情</th>
                        <th>操作</th>
                    </tr>
                    </thead>
                    <tbody>
                    <c:forEach var="paper" items="${requestScope.get('list')}" varStatus="status">
                        <tr>
                            <td>${paper.paperId}</td>
                            <td>${paper.paperName}</td>
                            <td>${paper.paperNum}</td>
                            <td>${paper.paperDetail}</td>
                            <td>
                                <a href="${path}/paper/toUpdatePaper?id=${paper.paperId}">更改</a> |
                                <a href="<%=appPath%>/paper/del/${paper.paperId}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                    </tbody>
                </table>
            </div>
        </div>
    </div>

addPaper,jsp：论文添加页面

    <%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2018/4/7
      Time: 16:45
      To change this template use File | Settings | File Templates.
    --%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%
        String path = request.getContextPath();
        String basePath = request.getScheme() + "://"
                + request.getServerName() + ":" + request.getServerPort()
                + path + "/";
    %>
    <html>
    <head>
        <title>新增论文</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 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>
                        基于SSM框架的管理系统：简单实现增、删、改、查。
                    </h1>
                </div>
            </div>
        </div>
     
        <div class="row clearfix">
            <div class="col-md-12 column">
                <div class="page-header">
                    <h1>
                        <small>新增论文</small>
                    </h1>
                </div>
            </div>
        </div>
        <form action="" name="userForm">
            论文名称：<input type="text" name="paperName"><br><br><br>
            论文数量：<input type="text" name="paperNum"><br><br><br>
            论文详情：<input type="text" name="paperDetail"><br><br><br>
            <input type="button" value="添加" onclick="addPaper()">
        </form>
     
        <script type="text/javascript">
            function addPaper() {
                var form = document.forms[0];
                form.action = "<%=basePath %>paper/addPaper";
                form.method = "post";
                form.submit();
            }
        </script>
    </div>

updatePaper.jsp：论文更改界面

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%
        String path = request.getContextPath();
        String basePath = request.getScheme() + "://"
                + request.getServerName() + ":" + request.getServerPort()
                + path + "/";
    %>
    <html>
    <head>
        <title>修改论文</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 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>
                        基于SSM框架的管理系统：简单实现增、删、改、查。
                    </h1>
                </div>
            </div>
        </div>
     
        <div class="row clearfix">
            <div class="col-md-12 column">
                <div class="page-header">
                    <h1>
                        <small>修改论文</small>
                    </h1>
                </div>
            </div>
        </div>
     
        <form action="" name="userForm">
            <input type="hidden" name="paperId" value="${paper.paperId}"/>
            论文名称：<input type="text" name="paperName" value="${paper.paperName}"/>
            论文数量：<input type="text" name="paperNum" value="${paper.paperNum}"/>
            论文详情：<input type="text" name="paperDetail" value="${paper.paperDetail }"/>
            <input type="button" value="提交" onclick="updatePaper()"/>
        </form>
        <script type="text/javascript">
            function updatePaper() {
                var form = document.forms[0];
                form.action = "<%=basePath %>paper/updatePaper";
                form.method = "post";
                form.submit();
            }
        </script>
    </div>

4. 利用tomcat进行项目部署

    下载 安装 tomcat：tomcat 9 下载地址
    IDEA配置tomcat：
    点击上方的 Run 选项，选择Edit Configuration

这里写图片描述

选择default -> tomcat -> local 选择下载安装到本地的tomcat服务器的地址

这里写图片描述

切换到Deployment选项页 点击 + 号选择 Arctifact ，

这里写图片描述
添加 项目名:war exploded 打包
这里写图片描述
最后在Application context 中选择 空白 那一项，点击 Apply 应用。
这里写图片描述

    最后切换到index.jsp界面，右键运行项目

这里写图片描述

5. 运行界面

这里写图片描述

论文列表界面：
这里写图片描述
新增论文界面：
这里写图片描述
论文修改界面：
这里写图片描述

至此，利用IDEA+Maven+SSM框架实现的简单的增、删、改、查功能已经构建完毕！
写者转载

详情请看原文：https://blog.csdn.net/qq_40061421/article/details/82112433