SSM框架入门

SSM框架实现用户登录注册,并部署到Tomcat服务器

请注意,本文编写于 824 天前,最后修改于 824 天前,其中某些信息可能已经过时。

一、目录

  • 通过SSM框架实现用户登录注册的功能
  • 部署到tomcat服务器上

二、实验结果和学习内容

首先前期准备当然是下载并安装好MySQL,Tomcat8,还有Maven了

首先配置好maven之后,通过maven来构建项目:

然后构建好项目目录:

首先是依赖文件pom.xml,即包含了要用到的包,会下载到maven的本地仓库中:

<?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>sysu.wangjing</groupId>
  <artifactId>mySSM</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>mySSM 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>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <!-- 使用junit4 用注解方式 -->
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- 补全项目依赖 -->
    <!-- 1:日志 java日志:slf4j,log4j,logback,common-logging slf4j 是规范/接口 日志实现:log4j,logback,common-logging
        使用:slf4j + logback -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.7</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
      <version>1.1.1</version>
    </dependency>
    <!-- 实现slf4j接口并整合 -->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.1.1</version>
    </dependency>

    <!-- 2:数据库相关依赖 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.30</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>c3p0</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.1.2</version>
    </dependency>
    <!-- DAO框架:MyBatis依赖 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.8</version>
    </dependency>
    <!-- mybatis自身实现的spring整合依赖 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!--:3:servlet web相关依赖 -->
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.1.0</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
    </dependency>
    <!-- 4:spring依赖 -->
    <!-- 1)spring核心依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <!-- 2)spring dao层依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <!-- 3)spring web相关依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.1.4.RELEASE</version>
    </dependency>
    <!-- 4)spring test相关依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>mySSM</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>3.1.0</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>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</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>

然后是UserController.java的实现:

package com.mySSM.controller;


import javax.servlet.http.HttpSession;

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 org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.mySSM.entity.User;
import com.mySSM.service.UserService;

@Controller
@RequestMapping("/user")

//这里用了@SessionAttributes,可以直接把model中的user(也就key)放入其中
//这样保证了session中存在user这个对象
@SessionAttributes("user")
public class UserController {

    @Autowired
    private UserService userServivce;

    //正常访问login页面
    @RequestMapping("/login")
    public String login(){
        return "login";
    }

    //表单提交过来的路径
    @RequestMapping("/checkLogin")
    public String checkLogin(User user,Model model){
        //调用service方法
        user = userServivce.checkLogin(user.getUsername(), user.getPassword());
        //若有user则添加到model里并且跳转到成功页面
        if(user != null){
            model.addAttribute("user",user);
            return "success";
        }
        return "fail";
    }

    //测试超链接跳转到另一个页面是否可以取到session值
    @RequestMapping("/anotherpage")
    public String hrefpage(){

        return "anotherpage";
    }

    //注销方法
    @RequestMapping("/outLogin")
    public String outLogin(HttpSession session){
        //通过session.invalidata()方法来注销当前的session
        session.invalidate();
        return "login";
    }

    @RequestMapping("/regist")
    public String regist(){
        return "regist";
    }

    @RequestMapping("/doRegist")
    public String doRegist(User user,Model model){
        System.out.println(user.getUsername());
        userServivce.Regist(user);
        return "success";
    }
}

然后是UserDao的实现:

package com.mySSM.dao;

import org.apache.ibatis.annotations.Param;

import com.mySSM.entity.User;

public interface UserDao {


    /**
     * 查找用户名和密码
     * @param username 登录用户名
     * @return
     */
    User findByUsername(String username);
    /**
     * 注册用户和密码
     */
    void registerByUsernameAndPassword(@Param("username")String username,
                                       @Param("password")String password);
}

然后是实体User.java的实现:

package com.mySSM.entity;

public class User {


    private String id;

    private String username;

    private String password;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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;
    }
}

接着是service层接口的实现UserService.java

package com.mySSM.service;

import com.mySSM.entity.User;

//Service层接口
public interface UserService {

    //检验用户登录
    User checkLogin(String username,String password);
    void Regist(User user);
}

及其实现UserServiceImpl.java

package com.mySSM.service.impl;

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

import com.mySSM.dao.UserDao;
import com.mySSM.entity.User;
import com.mySSM.service.UserService;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserDao userDao;

    /*
     * 检验用户登录业务
     *
     */

    public User checkLogin(String username, String password) {

        User user = userDao.findByUsername(username);
        if(user != null && user.getPassword().equals(password)){

            return user;
        }
        return null;
    }

    @Override
    public void Regist(User user) {

        userDao.registerByUsernameAndPassword(user.getUsername(),user.getPassword());

    }
}

然后在resources文件夹中,分别实现spring-dao.xmlspring-service.xmlspring-web.xml,三个和spring框架相关的配置文件。

首先是spring-dao.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:aop="http://www.springframework.org/schema/aop"
       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/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">
    <!-- 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.driverClass}"/>
        <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="1000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 约定大于配置 -->
    <!-- 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mybatis全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 扫描entity包 使用别名 com.sy.entity.User ->User -->
        <property name="typeAliasesPackage" value="com.mySSM.entity"/>
        <!-- 扫描sql配置文件:mapping需要的xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!-- 4:配置扫描Dao接口的包,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"/>
        <!-- 给出需要扫描的Dao接口包 -->
        <property name="basePackage" value="com.mySSM.dao"/>
    </bean>

</beans>

然后是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:aop="http://www.springframework.org/schema/aop"
       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/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">
    <!-- 扫描service包下所有使用注解的类型 -->
    <context:component-scan base-package="com.mySSM.service"/>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库的连接池 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置基于注解的声明式事务
        默认使用注解来管理事务行为
     -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

最后是spring-web.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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/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-3.0.xsd
        ">
    <!-- 配置springMVC -->
    <!-- 1:开启springMVC注解模式 -->
    <!-- 简化配置:
         (1)自动注册DefaultAnnotationHandlerMapping,AnnotationMethodHandlerAdapter
         (2)提供一系列:数据绑定,数字和日期的format  @NumberFormat,@DataTimeFormat
        xml,json默认读写支持
     -->
    <mvc:annotation-driven/>

    <!-- 2: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>
    <!-- 3:扫描web相关的bean -->
    <context:component-scan base-package="com.mySSM.controller" />
</beans>

然后还有几个简单的jsp文件,分别是注册和登录页面。

其中登录界面如下:

<%@ page language="java" contentType="text/html; charset=utf-8"
         pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Insert title here</title>
</head>
<body background="images/bg1.jpg">

<form action="${pageContext.request.contextPath}/user/checkLogin" method="post">
    <table>
        <tr>
            <td>用户名:</td>
            <td><input id="username" name="username" type="text"></td>
        </tr>
        <tr>
            <td>密码:</td>
            <td><input id="password" name="password" type="password"></td>
        </tr>
        <tr >
            <td><input type="submit" value="登录"  ></td>
            <td><input type="button" value="注册" onclick="window.location.href='/user/regist'"> </td>
        </tr>

    </table>
</form>
</body>
</html>

然后要手动连接数据库:

然后是配置本地的Tomcat,并且为了方便开发,部署模式选择war exploded

最后Build Project之后就成功部署了,然后可以看到界面成功展示了:


三、实验思考及感想

这次试验的目的在于先架起一个后端的框架,然后去慢慢地完善它。而这次的内容虽然不多,但很多地方都还是第一次上手,完全不熟悉,网上看到的内容也大多不尽相同,实在是有点摸不着头脑,特别是spring框架的配置文件,不同的人有不同的写法,可以说是五花八门了。然后实际上,功能方面的代码其实还不算多,倒是配置框架所花费的精力要更多,也不知道是好是坏,对于小项目来说,可能会有点杀鸡用牛刀的感觉,也许随着我们项目开发的逐步深入,框架的好处会体现出来吧。

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