使用IDEA整合SSM框架

時間 2019-11-30

標籤使用 idea 整合 ssm 框架欄目 Eclipse 简体版

原文原文鏈接

1、安裝環境和開發工具

在整合Spring，SpringMVC 和 MyBatis 的過程當中，很容易遇到一些小問題，所以記錄下整合過程。html

首先是安裝環境和開發工具，以下：java

Window 7
Jdk 1.8
MySql 8.0
Maven 3.5.4
Tomcat 8.5.34
IntelliJ IDEA 2018

2、總體項目結構

整個項目在Maven WebApp模板工程的基礎上構建，不一樣類型的文件放置於不一樣的包或者路徑下，所有配置完成後的工程結構以下圖所示：mysql

不一樣路徑下的文件歸類說明以下表(classpath至關於resources文件夾)：git

包名/路徑名	做用
controller	存放控制器
mapper	DAO層接口
pojo	實體類
service	業務類（接口+實現）

/com/cr/mapper	對應mapper下接口的xml文件
/spring	與spring相關的配置文件
/webapp/jsp	存放jsp文件
/*.properties	資源文件

3、配置步驟

一、添加Maven依賴

新建一個Maven WebApp工程，在pom.xml添加依賴，主要包括spring、springmvc、 mybatis、mybatis-spring 、servlet 、mysql 等項的jar包。

pom.xmlgithub

<?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.cr</groupId>
  <artifactId>SSMTest</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>SSMTest Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.version>5.0.8.RELEASE</spring.version>
    <jackson.version>2.9.3</jackson.version>
  </properties>

  <dependencies>
    <!--添加Spring MVC的依賴-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--添加Servlet的依賴-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <!--JSTL用於在控制器中將模型綁定到JSP中-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!--添加spring的依賴-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${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-aspects</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-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--利用它處理事務問題-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!--添加數據庫Mysql驅動-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <!--驅動版本號必定要裝正確 不然連不上 mysql 5.1.46 能夠適用本機-->
      <version>5.1.46</version>
    </dependency>

    <!--添加Mybatis依賴-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.6</version>
    </dependency>

    <!--整合Mybatis與Spring的依賴-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <!-- Mybatis分頁依賴 -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.2</version>
    </dependency>
    <!-- 處理時間日期格式 -->
    <dependency>
      <groupId>joda-time</groupId>
      <artifactId>joda-time</artifactId>
      <version>2.9.9</version>
    </dependency>
    <!-- 用於MD5加密 -->
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.10</version>
    </dependency>

    <!--日誌-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.12</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.12</version>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>


    <!--添加Json依賴-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</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-core</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <!--有時候不加可能會報錯-->
    <dependency>
      <groupId>net.sf.json-lib</groupId>
      <artifactId>json-lib</artifactId>
      <version>2.4</version>
      <classifier>jdk15</classifier>
    </dependency>

    <!-- 新添加處理json爲java bean -->
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-core-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <!-- 文件上傳 高版本可使用Multipart解析器 就不用引入這個包了 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!-- 數據源的引入， 池化技術 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.2.1</version>
    </dependency>
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>SSMTest</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.20.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

添加完成後的maven依賴以下：web

二、配置web.xml

spring上下文文件路徑配置spring

<!--配置Spring IoC的配置文件路徑 classpath至關於resources文件夾-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring/applicationContext.xml</param-value>
</context-param>

這裏指定了上下文配置文件爲spring文件夾下的applicationContext.xml，稍後再配置這個文件。sql

Log4j配置數據庫

<context-param>
    <param-name>log4jRefreshInterval</param-name>
    <param-value>60000</param-value>
</context-param>

ContextLoaderListener監聽器配置apache

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 防止Spring內存溢出監聽器 -->
<listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>

DispatcherServlet前置控制器配置

<servlet>
    <!--springmvc框架默認自動找到/WEB-INF/springmvc-servlet.xml做爲配置文件載入web工程中 這裏手動設置位置-->
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/springmvc-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
</servlet>

springmvc框架默認自動找到/WEB-INF/[servlet-name]-servlet.xml做爲配置文件載入web工程中這裏手動設置位置爲spring文件夾下的springmvc-servlet.xml，稍後再配置這個文件。

Servlet攔截設置

<servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

web.xml

<?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"
         version="3.1">

    <!-- Spring配置 -->
    <!-- ================================================= -->
    <!--配置Spring IoC的配置文件路徑 classpath至關於resources文件夾-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/applicationContext.xml</param-value>
    </context-param>
    <!--Log4j配置-->
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>
    <!--配置ContextLoaderListener初始化IOC容器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 防止Spring內存溢出監聽器 -->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>

    <!-- Spring mvc配置 -->
    <!-- ================================================= -->
    <!--DispatcherServlet前置控制器配置-->
    <servlet>
        <!--springmvc框架默認自動找到/WEB-INF/springmvc-servlet.xml做爲配置文件載入web工程中 這裏手動設置位置-->
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>
    <!--攔截內容：servlet映射設置-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

三、applicationContext.xml配置

在spring文件夾下創建applicationContext.xml

applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--引入spring和其餘整合的配置文件 好比spring-mybatis.xml等-->
    <import resource="classpath:spring/spring-*.xml"/>

</beans>

這裏引入spring和其餘整合的配置文件好比spring-mybatis.xml等，接下來在spring文件夾下新建一個spring-mybatis.xml文件

四、spring-mybatis.xml配置

配置自動掃描，須要掃描到控制層和服務層，剛開始我這裏寫成了com.cr.mapper，結果致使控制器不能注入
```
<context:component-scan base-package="com.cr" />
```

新建數據庫資源文件jdbc.properties，針對不一樣的數據庫須要修改配置同時要注意匹配數據庫的版本號，好比我安裝的是MySQL 8.0，以前因爲驅動版本弄錯了，因此老是鏈接數據庫失敗，後來改爲5.1.46才解決了問題

# 針對不一樣的數據庫須要修改配置 同時要注意匹配數據庫的版本號
mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/mybatis
mysql.username=root
mysql.password=XXXX

#定義初始鏈接數
dbcp.initialSize=0
#定義最大鏈接數
dbcp.maxActive=20
#定義最大空閒
dbcp.maxIdle=20
#定義最小空閒
dbcp.minIdle=1
#定義最長等待時間
dbcp.maxWait=60000

引入數據庫資源文件

<bean id="propertyConfigurer"
      class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:jdbc.properties" />
</bean>

配置數據庫MySQL

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${mysql.driver}" />
    <property name="url" value="${mysql.url}" />
    <property name="username" value="${mysql.username}" />
    <property name="password" value="${mysql.password}" />


    <property name="initialSize" value="${dbcp.initialSize}" />
    <property name="maxActive" value="${dbcp.maxActive}" />
    <property name="maxIdle" value="${dbcp.maxIdle}" />
    <property name="minIdle" value="${dbcp.minIdle}" />
    <property name="maxWait" value="${dbcp.maxWait}" />
</bean>

整合Spring和MyBatis，注意路徑的書寫方式是"/"不是"."

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <!-- 自動掃描mapping.xml文件 注意路徑是"/"不是"."-->
    <property name="mapperLocations" value="classpath:com/cr/mapper/*.xml" />
    <property name="configuration">
        <!--能夠將以前mybatis.cfg.xml的一些配置項轉移到這裏來-->
        <bean class="org.apache.ibatis.session.Configuration">
            <property name="mapUnderscoreToCamelCase" value="true" />
        </bean>
    </property>
</bean>

掃描持久層接口

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.cr.mapper" />
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>

數據庫事務管理

<bean id="transactionManager"
      class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
</bean>

spring-mybatis.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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/cache"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/aop
                        http://www.springframework.org/schema/aop/spring-aop.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc.xsd
                        http://www.springframework.org/schema/cache
                        http://www.springframework.org/schema/cache/spring-cache.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 自動掃描包 包括了控制層和服務層 -->
    <context:component-scan base-package="com.cr" />
    <!-- 引入數據庫配置文件 -->
    <bean id="propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${mysql.driver}" />
        <property name="url" value="${mysql.url}" />
        <property name="username" value="${mysql.username}" />
        <property name="password" value="${mysql.password}" />


        <property name="initialSize" value="${dbcp.initialSize}" />
        <property name="maxActive" value="${dbcp.maxActive}" />
        <property name="maxIdle" value="${dbcp.maxIdle}" />
        <property name="minIdle" value="${dbcp.minIdle}" />
        <property name="maxWait" value="${dbcp.maxWait}" />
    </bean>

    <!-- 整合Spring和MyBatis，就不須要以前的mybatis配置文件了 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自動掃描mapping.xml文件 注意路徑是"/"不是"."-->
        <property name="mapperLocations" value="classpath:com/cr/mapper/*.xml" />
        <property name="configuration">
            <!--能夠將以前mybatis.cfg.xml的一些配置項轉移到這裏來-->
            <bean class="org.apache.ibatis.session.Configuration">
                <property name="mapUnderscoreToCamelCase" value="true" />
            </bean>
        </property>
    </bean>

    <!-- 掃描DAO持久層接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.cr.mapper" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

    <!-- 數據庫事務管理 -->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
</beans>

五、springmvc-servlet.xml配置

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 http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">

    <!-- scan the package and the sub package -->
    <context:component-scan base-package="com.cr.controller"/>
    <!-- don't handle the static resource -->
    <mvc:default-servlet-handler />

    <!-- if you use annotation you must configure following setting -->
    <mvc:annotation-driven />

    <!-- configure the InternalResourceViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!--至關於尋找/jsp/xxx.jsp文件-->
        <!-- 前綴 -->
        <property name="prefix" value="/jsp/" />
        <!-- 後綴 -->
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

六、創建實體類

在pojo包下新建一個實體User類，包含用戶名username 和密碼password 字段，alt + insert 生成 setter和getter方法

User.java

package com.cr.pojo;


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;
    }
}

七、DAO層創建

建立測試用表t_user，並添加兩條數據
在mapper包下新建一個UserMapper接口，包含一個select查詢方法，能夠查詢用戶是否存在，若不存在返回null

UserMapper.java
```
package com.cr.mapper;

import com.cr.pojo.User;

public interface UserMapper {
    User select(User user);
}
```

建立UserMapper和mybatis映射文件 UserMapper.xml，路徑是resource/com/cr/mapper

UserMapper.xml

<?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.cr.mapper.UserMapper">
    <select id="select" parameterType="com.cr.pojo.User" resultType="com.cr.pojo.User">
        select * from t_user
        where username = #{username}
        and password = #{password}
    </select>
</mapper>

八、服務層創建

創建UserService接口，位於service包下

UserService.java

package com.cr.service;

import com.cr.pojo.User;

public interface UserService {
    /**
     * 根據user信息檢查數據庫中是否存在該用戶
     */
    User get(User user);
}

在service包下創建impl子包，添加實現類UserServiceImpl

UserServiceImpl.java

package com.cr.service.impl;

import com.cr.mapper.UserMapper;
import com.cr.pojo.User;
import com.cr.service.UserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
// @Service用於業務層 功能等同於@component
@Service("userService")
public class UserServiceImpl implements UserService {
    @Resource
    private UserMapper userMapper;

    @Override
    public User get(User user) {
        // 經過Mapper的select方法查詢用戶
        return userMapper.select(user);
    }
}

九、創建控制器

在controller包下創建控制器UserController，根據表單的用戶名和密碼，在數據中匹配，若是存在該用戶，則跳轉到登陸成功界面user.jsp，若是用戶不存在則返回null，重定向回登陸界面，以便於從新登陸。

UserController.java

package com.cr.controller;

import com.cr.pojo.User;
import com.cr.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
// spring-mybatis.xml和springmvc-servlet.xml都配置了掃描控制層
@Controller
public class UserController {
    // 注入UserService
    @Resource
    private UserService userService;

    @RequestMapping(value = "/login")
    public String login(User user) {
        ModelAndView mv = new ModelAndView();
        System.out.println("開始查詢---");
        user = userService.get(user);

        if (user != null) {
            System.out.println("查到的User: " + user.getUsername());
            mv.addObject("user", user);
            // 轉到user.jsp用戶界面
            return "user";
        } else {
            System.out.println("未查到此用戶");
            // 查不到用戶信息，則重定向回登陸界面
            System.out.println("重定向回登陸界面---");
            return "login";
        }
    }
}

十、創建Jsp頁面

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>login</title>
</head>
<body>
<h1>用戶登陸界面</h1>
<h2>用戶信息</h2>
<h3>Tom  123</h3>
<h3>Jack 456</h3>
<br>
<form id="form" action="/login" method="post">
    <table>
        <tr>
            <td>用戶名</td>
            <td><input id="username" name="username" value="" /></td>
        </tr>
        <tr>
            <td>密碼</td>
            <td><input id="password-always-checkbox" name="password" /></td>
        </tr>
        <tr>
            <td></td>
            <td align="right"><input type="submit" value="提交"></td>
        </tr>
    </table>
</form>

</body>
</html>

user.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>User</title>
</head>
<body>
<h1>用戶登陸成功</h1>
<br>
歡迎您: ${user}
</body>
</html>

4、部署項目

一、Tomcat配置

二、啓動服務器

瀏覽器訪問http://localhost:8080/login
填寫錯誤的用戶名或者密碼，瀏覽器將從新返回登陸界面，控制檯顯示以下：
填寫正確的用戶名Tom和密碼123，跳轉到登陸成功界面user.jsp，顯示以下：
以上說明SSM框架整合成功，項目地址：https://github.com/wychencr/SSM-Test

5、一些注意事項

MySQL的驅動要匹配本機安裝的版本
resources文件夾要被標記爲Resource Root
xml配置文件中的classpath至關於/resources
IDEA可能會提示上下文配置文件沒有添加，只要打開工程結構選項，把當前xml文件添加到工程中便可
注意各個xml配置文件中掃描包的位置，若是有遺漏就會報錯
注意各個jar包的版本問題，我原來使用最新的Mybatis 3.4.6就會出現報錯

java.lang.IllegalAccessError: org.apache.commons.dbcp.DelegatingPreparedStatement.isClosed()

修改版本爲3.2.6後解決問題