Maven

一、前述

Maven 是专门用于构建和管理 Java 相关项目的工具，利用 Maven 的主要目的是统一维护 jar 包。

SSM（Spring+SpringMVC+MyBatis）框架集由 Spring、MyBatis 两个开源框架整合而成（SpringMVC 是 Spring 中的部分内容）。

由于 Spring MVC 是 Spring 框架中的一个模块，所以 Spring MVC 与 Spring 之间不存在整合的问题，只要引入相应 JAR 包就可以直接使用。因此 SSM 框架的整合就只涉及到了 Spring 与 MyBatis 的整合，以及 Spring MVC 与 MyBatis 的整合。Spring 与 MyBatis 框架的整合时，通过 Spring 实例化 Bean，然后调用实例对象中的查询方法来执行 MyBatis 映射文件中的 SQL 语句的，如果能够正确查询出数据库中的数据，那么就可以认为 Spring 与 MyBatis 框架整合成功。加入 Spring MVC 后，如果可以通过前台页面来执行查询方法，并且查询出的数据能够在页面中正确显示，那么就可以认为三大框架整合成功。

二、Maven+SSM框架整合

首先说明用到的框架： spring  +  springMVC  +  mybatis
构建工具：maven
开发工具：eclipse
开发环境：win10      java版本：jdk1.8      tomcat版本：tomcat8.5

1）创建Maven项目

新建Maven项目，选择Maven Project，勾选第一个，然后【Next】下一步。

设置GroupID(一般为公司名)、ArtifactID(项目名)和Packaging(打包方式)

【Finish】项目创建完成 - 如果pom文件报错显示web.xml丢失，在src -> main -> webapp下创建WEB-INF目录，并在目录下创建web.xml

2）利用Maven导入jar包

前述中我也说了，利用 Maven 的目的就是要统一维护 jar 包，而jar包的维护则是通过一个 pom.xml 文件来实现的，我们可以在目录中看到一个 pom.xml 文件，项目的 jar 包也正是要通过这个文件导入。

<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.cyan</groupId>
    <artifactId>Maven_SSM</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <!-- 声明版本号 / 统一管理版本 -->
    <properties>
        <!-- lib version - jar版本 -->
        <spring.version>5.0.8.RELEASE</spring.version>
        <mybais.version>3.4.6</mybais.version>
        <mybatis-spring.version>1.3.2</mybatis-spring.version>
        <mysql-connector.version>5.1.46</mysql-connector.version>
        <ojdbc7.version>12.1.0.2.0</ojdbc7.version>
        <druid.version>1.0.16</druid.version>
        <aopalliance.version>1.0</aopalliance.version>
        <aspectj.weaver.version>1.6.4.RELEASE</aspectj.weaver.version>
        <commons.logging.version>1.1.1</commons.logging.version>
        <jstl.version>1.2</jstl.version>
        <log4j.version>1.2.16</log4j.version>
        <slf4j-api.version>1.6.1</slf4j-api.version>
        <slf4j-nop.version>1.6.4</slf4j-nop.version>
        <fileupload.version>1.3.1</fileupload.version>
        <jackson.version>2.9.6</jackson.version>
        <servlet-api.version>8.5.32</servlet-api.version>
        <jsp-api.version>8.5.32</jsp-api.version>
        <!-- plugins version - 插件版本 -->
        <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
        <tomcat7-maven-plugin.version>2.2</tomcat7-maven-plugin.version>
    </properties>

    <!-- 锁定版本 / 避免依赖冲突 -->
    <dependencyManagement>
        <dependencies>
            <!-- spring -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- spring end -->

            <!-- mybais -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybais.version}</version>
            </dependency>
            <!-- mybatis - spring 整合包 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>${mybatis-spring.version}</version>
            </dependency>

            <!-- json -->
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-core</artifactId>
                <version>${jackson.version}</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-annotations</artifactId>
                <version>${jackson.version}</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>${jackson.version}</version>
            </dependency>
            <!-- json end -->
        </dependencies>
    </dependencyManagement>

    <!-- 配置依赖 - 加入SSM框架所需的依赖 -->
    <dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
        </dependency>
        <!-- spring end -->

        <!-- mybais核心包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>

        <!-- mybatis - spring 整合包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>

        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql-connector.version}</version>
        </dependency>

        <dependency>
            <groupId>cn.easyproject</groupId>
            <artifactId>ojdbc7</artifactId>
            <version>${ojdbc7.version}</version>
        </dependency>
        <!-- mysql end -->

        <!-- 阿里巴巴的数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>

        <!-- aop -->
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>${aopalliance.version}</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>com.springsource.org.aspectj.weaver</artifactId>
            <version>${aspectj.weaver.version}</version>
        </dependency>
        <!-- aop end -->

        <!-- logging -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>com.springsource.org.apache.commons.logging</artifactId>
            <version>${commons.logging.version}</version>
        </dependency>

        <!-- jsp标准标签库 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>${jstl.version}</version>
        </dependency>

        <!-- log - 日志文件管理包 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j-api.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>${slf4j-nop.version}</version>
            <!-- 避免jar冲突 - 排除依赖导入 -->
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- log end -->

        <!--文件上传组件包 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>${fileupload.version}</version>
        </dependency>

        <!-- json -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <!-- json end -->

        <!-- servlet-api 8.5.32 -->
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>${servlet-api.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- jsp-api 8.5.32 -->
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <version>${jsp-api.version}</version>
            <scope>provided</scope>
        </dependency>

        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <!-- 配置插件 -->
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven-compiler-plugin.version}</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>${tomcat7-maven-plugin.version}</version>
                <configuration>
                    <url>http://localhost:8080/manager/text</url>
                    <username>alin</username>
                    <password>123123</password>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3）pom.xml配置Maven Resources资源放行

① 因为 Maven 会把 src/main/java 下的 *.java 文件文件编译放到 target/classes 目录目录中，但这目录中的其他文件会被忽略；
② Mybatis Mapper 映射文件也要放在 src/main/java 下，所以不能忽略；
③ 因此我们需要对 src/main/java 下的配置文件进行过滤，不能被忽略；
④ 利用 Maven 中的 Resources 标签可以进行配置；

<!-- 配置Maven Resources资源放行 -->
<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
    <!-- 放行main/resources下的配置文件 如果不放行spring mybatis等配置文件不会被打到包里从而导致错误 -->
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
</resources>

4）创建SSM框架所需配置文件

在 src -> main -> resources 目录下创建

● 建立 jdbc 属性配置文件 - db.properties

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/ssm_springmvc?useUnicode=true&characterEncoding=utf-8&useSSL=true
jdbc.user=root
jdbc.password=123456

● 分层建立 Spring 配置文件

 - Dao层：读取 db.properties 文件的配置和数据源配置，配置Mybatis与mapper工厂

<?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-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!-- 读取配置文件：数据库 -->
    <context:property-placeholder location="classpath:db.properties" />

    <!-- 配置C3P0数据源 -->
    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClass}" />
        <property name="url" value="${jdbc.jdbcUrl}" />
        <property name="username" value="${jdbc.user}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!-- 配置Mybatis -->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置bean别名 -->
        <property name="typeAliasesPackage" value="com.cyan.bean" />
    </bean>

    <!-- 配置mapper工厂 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.cyan.mapper" />
    </bean>

</beans>

 - Service层：开启事物、Service注解，配置事务管理器

<?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-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!-- 开启注解扫描 -->
    <context:component-scan base-package="cn.alin.service" />

</beans>

<?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" xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

    <!-- 事务核心管理器 -->
    <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 注解事务 -->
    <tx:annotation-driven transaction-manager="transactionManager" />

</beans>

 - MVC层：配置用于扫描 @Controller 注解的包扫描器、注解驱动器以及视图解析器

<?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-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!-- 使用配置文件解决查询词典时硬编码问题 -->
    <context:property-placeholder location="classpath:dictTypeid.properties" />

    <!-- 开启注解扫描 -->
    <context:component-scan base-package="cn.alin.controller" />

    <!-- 开启注解驱动 -->
    <mvc:annotation-driven />

    <!-- 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>

    <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
    <bean name="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 上传文件的编码 -->
        <property name="defaultEncoding" value="UTF-8" />
    </bean>

</beans>

5）修改 web.xml 文件

配置 spring 的文件监听器、编码过滤器以及 Spring MVC 的前端控制器等信息。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
    <display-name>maven_ssm</display-name>

    <!-- 静态资源过滤 -->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.css</url-pattern>
        <url-pattern>*.ttf</url-pattern>
        <url-pattern>*.woff</url-pattern>
        <url-pattern>*.js</url-pattern>
        <url-pattern>*.png</url-pattern>
        <url-pattern>*.jpg</url-pattern>
        <url-pattern>*.gif</url-pattern>
    </servlet-mapping>

    <!-- 启动Spring -->
    <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>

    <!-- 配置前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置springmvc加载的配置文件（配置处理器映射器、适配器等） -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 过滤器 解决POST提交中文乱码问题 -->
    <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>

6）测试

到这里利用 Maven 整合 SSM 框架的所有操作已经完成了，那么接下来让我们验证一下，刚刚的整合操作是否存在问题呢？

① 建立 bean 持久化对象 - 用于映射数据库表的持久化类。

package com.cyan.bean;

public class User {

    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User [username=" + username + ", password=" + password + "]";
    }

}

package com.cyan.bean;

public class ItemInfo {

    // id
    private String item_id;
    // name
    private String item_name;
    // type
    private String item_type;
    // price
    private Double item_price;

    public String getItem_id() {
        return item_id;
    }

    public void setItem_id(String item_id) {
        this.item_id = item_id;
    }

    public String getItem_name() {
        return item_name;
    }

    public void setItem_name(String item_name) {
        this.item_name = item_name;
    }

    public String getItem_type() {
        return item_type;
    }

    public void setItem_type(String item_type) {
        this.item_type = item_type;
    }

    public Double getItem_price() {
        return item_price;
    }

    public void setItem_price(Double item_price) {
        this.item_price = item_price;
    }

    @Override
    public String toString() {
        return "ItemInfo [item_id=" + item_id + ", item_name=" + item_name + ", item_type=" + item_type
                + ", item_price=" + item_price + "]";
    }

}

② 建立 dao层 mapper 接口文件和映射文件

package com.cyan.mapper;

import java.util.List;

import com.cyan.bean.ItemInfo;

public interface ItemMapper {

    // 获取游戏列表
    List<ItemInfo> getAllList();
}

<?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.cyan.mapper.ItemMapper">

    <!-- List<ItemInfo> getAllList(); -->
    <select id="getAllList" resultType="ItemInfo">
        SELECT item_id,item_name,item_type,item_price
        FROM item_info
    </select>

</mapper>

③ 建立 service 接口与 service 实现类

实现类采用了基于注解的形式， @Service 注解标识业务层的实现类， @Autowired 注解将 ItemMapper 接口对象注入到类中。

package com.cyan.service;

import java.util.List;

import com.cyan.bean.ItemInfo;

public interface ItemService {
    
    List<ItemInfo> getAllList();
}

package com.cyan.service;

import java.util.List;

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

import com.cyan.bean.ItemInfo;
import com.cyan.mapper.ItemMapper;

@Service
public class ItemServiceImpl implements ItemService {

    @Autowired
    private ItemMapper itemMapper;

    @Override
    public List<ItemInfo> getAllList() {
        return itemMapper.getAllList();
    }

}

④ 建立 controller 控制层对象

package com.cyan.controller;

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.RequestMapping;

import com.cyan.bean.ItemInfo;
import com.cyan.bean.User;
import com.cyan.service.ItemService;

@Controller
public class UserConteoller {

    @Autowired
    private ItemService itemService;

    // 后台接收用户名和密码，跳转页面，并显示
    @RequestMapping("/login")
    public String login(User user, Model model) {
        // 打印到服务器控制台
        System.err.println("user = " + user);
        // 传递到jsp页面
        model.addAttribute("User", user);
        return "list";
    }

    // 读取数据库 显示游戏列表
    @RequestMapping("/list")
    public String list(Model model) {

        List<ItemInfo> itemList = itemService.getAllList();

        // 打印到服务器控制台
        for (ItemInfo itemInfo : itemList) {
            System.out.println("itemInfo = " + itemInfo);
        }

        model.addAttribute("itemList", itemList);
        return "item_list";
    }

}

⑤ 建立 jsp 文件

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login...</title>
</head>
<body>

    <!-- 输入用户名密码 提交表单到后台,跳转页面显示用户名密码 -->
    <form action="${pageContext.request.contextPath }/login" method="get">
        <input type="text" name="username" /> 
        <input type="text" name="password" /> 
        <input type="submit" value="确认" />
    </form>

    <!-- 获取数据库游戏列表信息 -->
    <button onclick="window.location='${pageContext.request.contextPath }/list'">游戏列表</button>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

    <br /> 用户名：${User.username }
    <br /> 密码：${User.password }

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

    <c:forEach items="${itemList }" var="item">
        <label>${item.item_name } </label>
        <label>${item.item_type } </label>
        <br />
    </c:forEach>

</body>
</html>

⑥ 将项目发布到 tomcat 中 - 右键项目 -> Run As -> Maven build...  -> tomcat7:deploy 或 tomcat7:redeploy

输入URL测试 - 表单输入Alin / 666666

确认键：

游戏列表按钮：

Tomcat输出：