SSM实现最简单的登录验证

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1.导入项目相关的jar包

以上就是该项目所需要的一些jar包（可能会有些jar没有用到，jar包是我自己在网上找的，放在/WEB-INF/bin文件夹里面，就不需要导包了！）
小编上传的jar包：http://download.csdn.net/detail/qq_25997041/9663603

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2.建立项目结构

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3.配置文件的配置

db.properties

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jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://127.0.0.1:3306/test1jdbc.username=rootjdbc.password=#定义初始连接数jdbc.initialSize=0#定义最大连接数jdbc.maxActive=20#定义最大空闲jdbc.maxIdle=20#定义最小空闲jdbc.minIdle=1#定义最长等待时间jdbc.maxWait=60000

log4j.properties

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#定义LOG输出级别log4j.rootLogger=INFO,Console,File#定义日志输出目的地为控制台log4j.appender.Console=org.apache.log4j.ConsoleAppenderlog4j.appender.Console.Target=System.out#可以灵活地指定日志输出格式，下面一行是指定具体的格式log4j.appender.Console.layout = org.apache.log4j.PatternLayoutlog4j.appender.Console.layout.ConversionPattern=[%c] - %m%n#文件大小到达指定尺寸的时候产生一个新的文件log4j.appender.File = org.apache.log4j.RollingFileAppender#指定输出目录log4j.appender.File.File = logs/ssm.log#定义文件最大大小log4j.appender.File.MaxFileSize = 10MB# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志log4j.appender.File.Threshold = ALLlog4j.appender.File.layout = org.apache.log4j.PatternLayoutlog4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH:mm:ss}][%c]%m%n

spring-mybatis.xml

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<?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:util="http://www.springframework.org/schema/util" xmlns:jee="http://www.springframework.org/schema/jee"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">    <!-- 自动扫描 -->    <context:component-scan base-package="com.cn.ft" />    <!-- 引入配置文件 -->    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">        <property name="location" value="classpath:db.properties" />    </bean>    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"        destroy-method="close">        <property name="driverClassName" value="${jdbc.driver}" />        <property name="url" value="${jdbc.url}" />        <property name="username" value="${jdbc.username}" />        <property name="password" value="${jdbc.password}" />        <!-- 初始化连接大小 -->        <property name="initialSize" value="${jdbc.initialSize}"></property>        <!-- 连接池最大数量 -->        <property name="maxActive" value="${jdbc.maxActive}"></property>        <!-- 连接池最大空闲 -->        <property name="maxIdle" value="${jdbc.maxIdle}"></property>        <!-- 连接池最小空闲 -->        <property name="minIdle" value="${jdbc.minIdle}"></property>        <!-- 获取连接最大等待时间 -->        <property name="maxWait" value="${jdbc.maxWait}"></property>    </bean>    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <property name="dataSource" ref="dataSource" />        <!-- 自动扫描mapping.xml文件 -->        <property name="mapperLocations" value="classpath:com/cn/ft/mapping/*.xml"></property>    </bean>    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">        <property name="basePackage" value="com.cn.ft.dao" />        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>    </bean>    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource" />    </bean></beans>

spring-mvc.xml

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<?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:util="http://www.springframework.org/schema/util" xmlns:jee="http://www.springframework.org/schema/jee"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">    <!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->    <context:component-scan base-package="com.cn.ft.controller" />    <!--避免IE执行AJAX时，返回JSON出现下载文件 -->    <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">        <property name="supportedMediaTypes">            <list>                <value>text/html;charset=UTF-8</value>            </list>        </property>    </bean>    <!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">        <property name="messageConverters">            <list>                <ref bean="mappingJacksonHttpMessageConverter" />   <!-- JSON转换器 -->            </list>        </property>    </bean>    <!-- 定义跳转的文件的前后缀 ，视图模式配置 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->        <property name="prefix" value="/WEB-INF/" />        <property name="suffix" value=".jsp" />    </bean>    <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- 默认编码 -->        <property name="defaultEncoding" value="utf-8" />        <!-- 文件大小最大值 -->        <property name="maxUploadSize" value="10485760000" />        <!-- 内存中的最大值 -->        <property name="maxInMemorySize" value="40960" />    </bean></beans>

Account.java

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package com.cn.ft.entity;public class Account {    private Integer id;    private String user;    private String paw;    private Integer age;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getUser() {        return user;    }    public void setUser(String user) {        this.user = user;    }    public String getPaw() {        return paw;    }    public void setPaw(String paw) {        this.paw = paw;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }}

AccountDao.java

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package com.cn.ft.dao;import com.cn.ft.entity.Account;public interface AccountDao {    public Account getByName(String user);}

accountMapping.xml

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<?xml version="1.0" encoding="UTF-8" ?>  <!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"       "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"><mapper namespace="com.cn.ft.dao.AccountDao">    <select id="getById" parameterType="int" resultMap="accountMap">        select * from account where id = #{id}    </select>    <select id="getByName" parameterType="string" resultMap="accountMap">        select * from account where acc = #{name}    </select>    <resultMap id="accountMap" type="com.cn.ft.entity.Account">        <id property="id" column="id" />        <result property="user" column="acc" />        <result property="paw" column="password" />        <result property="age" column="age" />    </resultMap></mapper>

AccountController.java

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package com.cn.ft.controller;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import com.cn.ft.dao.AccountDao;import com.cn.ft.entity.Account;@Controller@RequestMapping("/account")public class AccountController {    @Resource    private AccountDao dao;    @RequestMapping("/showAccount")    public String toShowAccount(HttpServletRequest request, Model model) {        String user = request.getParameter("user");        String paw = request.getParameter("paw");        if (user == null || user == "") {            model.addAttribute("msg", "账号为空");            return "login";        }        Account account = dao.getByName(user);        if (!account.getPaw().equals(paw)) {            model.addAttribute("msg", "密码错误");            return "login";        }        model.addAttribute("acc", account);        return "showAccount";    }    @RequestMapping("/toLogin")    public String toLogin() {        return "login";    }}

web.xml

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<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://java.sun.com/xml/ns/javaee"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"    version="3.0">    <display-name>web</display-name>    <welcome-file-list>        <welcome-file>login.jsp</welcome-file>    </welcome-file-list>    <!-- Spring配置文件 -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:spring-mybatis.xml</param-value>    </context-param>    <!-- 编码过滤器 -->    <filter>        <filter-name>encodingFilter</filter-name>        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>        <async-supported>true</async-supported>        <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>    <!-- 配置Spring监听器 -->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <!-- 添加对SpringMVC的支持 -->    <servlet>        <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-mvc.xml</param-value>        </init-param>    </servlet>    <servlet-mapping>        <servlet-name>SpringMVC</servlet-name>        <url-pattern>*.do</url-pattern>    </servlet-mapping></web-app>

4.数据库

数据库字段以及数据信息：

6.测试

DaoTest.java

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package com.cn.ft.test;import org.apache.log4j.Logger;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.alibaba.fastjson.JSON;import com.cn.ft.dao.AccountDao;import com.cn.ft.entity.Account;public class DaoTest {    private Logger logger = Logger.getLogger(DaoTest.class);    @Test    public void ssfTest() {        ApplicationContext ac = new ClassPathXmlApplicationContext("spring-mybatis.xml");        AccountDao dao = ac.getBean(AccountDao.class);        Account acc = dao.getByName("haha");        logger.info(JSON.toJSONString(acc));    }}

成功结果：

执行测试代码，看到数据库中的数据，表明已经成功

5.页面

login.jsp

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<%@page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>Login</title></head><body>    <form action="showAccount.do" method="post">        <div>            账号：<input type="text" name="user" placeholder="请输入账号">        </div>        <div>            密码：<input type="password" name="paw" placeholder="请输入密码">        </div>        <div>            <span>${msg }</span>        </div>        <div>            <input type="submit" value="登录">        </div>    </form></body></html>

showAccount.jsp

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<%@page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>Account</title></head><body>    <h1>测试</h1>    <h2>ID：${acc.id }</h2>    <h3>USER：${acc.user }</h3>    <h4>PAW：${acc.paw }</h4>    <h5>AGE：${acc.age }</h5></body></html>

6.测试页面

将项目添加到服务器，小编用的是Tomcat
在浏览器中输入一下网址访问：

http://localhost:8080/项目名称/account/toLogin.do

效果图：

输入数据库中保存的账号和密码登录成功效果：

在过程中，小编遇到了两个BUG，都是因为缺少jar包引起的错误，若您也遇到相同的报错信息可以往这方面想，一下是小编的报错信息（仅供参考）：

注：缺少 commons-fileupload-1.3.2.jar

注：缺少 jackson-mapper-asl-1.9.13.jar 和 jackson-core-asl-1.9.13.jar

以上就是小编这次的SSM学习之旅！如果有大神看到有哪里不好的地方，希望您告诉小编改进改进！

注：以上的配置文件是小编收集整理起来的，并非全部原创，感谢分享的博主。