基于SSM框架实现简单的登录注册的示例代码

<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.imooc</groupid>
  <artifactid>userlogin</artifactid>
  <version>0.0.1-snapshot</version>
  <packaging>war</packaging>

  <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>1.7.12</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>5.1.35</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>3.3.0</version>
    </dependency>
    <!-- mybatis自身实现的spring整合依赖 -->
    <dependency>
      <groupid>org.mybatis</groupid>
      <artifactid>mybatis-spring</artifactid>
      <version>1.2.3</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>2.5.4</version>
    </dependency>
    <dependency>
      <groupid>javax.servlet</groupid>
      <artifactid>javax.servlet-api</artifactid>
      <version>3.1.0</version>
    </dependency>
    <!-- 4：spring依赖 -->
    <!-- 1)spring核心依赖 -->
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-core</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-beans</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-context</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <!-- 2)spring dao层依赖 -->
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-jdbc</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-tx</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <!-- 3)spring web相关依赖 -->
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-web</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-webmvc</artifactid>
      <version>4.2.0.release</version>
    </dependency>
    <!-- 4)spring test相关依赖 -->
    <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-test</artifactid>
      <version>4.2.0.release</version>
    </dependency>
  </dependencies>
  <build>
    <finalname>userlogin</finalname>
    <plugins>
      <!-- define the project compile level -->
      <!-- maven编译用的版本控制，控制jdk的版本不会回跳 -->
      <plugin>
        <groupid>org.apache.maven.plugins</groupid>
        <artifactid>maven-compiler-plugin</artifactid>
        <version>2.3.2</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

jdbc.driverclass=com.mysql.jdbc.driver
jdbc.url=jdbc:mysql://localhost:3306/mysystem?useunicode=true&characterencoding=utf-8
jdbc.username=root
jdbc.password=kongtao

<?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.sy.controller" />
</beans>

package com.sy.dao;

import org.apache.ibatis.annotations.param;

import com.sy.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);
}

<?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.sy.dao.userdao">
  <!-- 目的：为dao接口方法提供sql语句配置 -->
  <!-- 查询用户和密码进行登录 -->
  <select id="findbyusername" resulttype="user" parametertype="string">
  
    select * from user where username = #{username}
      
  </select>

  <!--增加用户名和密码进行注册 -->
  <insert id="registerbyusernameandpassword">
     insert into user (username,password)
    values (#{username},#{password})
  </insert>
  
</mapper>

package com.sy.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.sy.entity.user;
import com.sy.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";
  }
}

package com.sy.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;
  }
}

package com.sy.service;
import com.sy.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);
}

package com.sy.service.impl;

import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;

import com.sy.dao.userdao;
import com.sy.entity.user;
import com.sy.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());

  }
}

<?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.sy.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.sy.dao"/>
  </bean>

</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: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.sy.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>

<?xml version="1.0" encoding="utf-8"?>
<configuration debug="true">
  <appender name="stdout" class="ch.qos.logback.core.consoleappender">
    <!-- encoders are by default assigned the type ch.qos.logback.classic.encoder.patternlayoutencoder -->
    <encoder>
      <pattern>%d{hh:mm:ss.sss} [%thread] %-5level %logger{36} - %msg%n
      </pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="stdout" />
  </root>
</configuration>

<?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
      select name as title from table
     -->
    <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>

<%@ 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>

<%--
 created by intellij idea.
 user: 86265
 date: 2018/1/30
 time: 10:32
 to change this template use file | settings | file templates.
--%>
<%@ page contenttype="text/html;charset=utf-8" language="java" %>
<html>
<head>
  <title>用户注册页面</title>
</head>
<body>
  <h3>注册页面</h3>
  <hr/>
  <form action="${pagecontext.request.contextpath}/user/doregist" method="post">
    <table border="1px">
      <tr height="35px">
        <td width="150px">用户名</td>
        <td width="300px">
          <input type="text" name="username" id="username">
        </td>
      </tr>
      <tr height="35px">
        <td>密码</td>
        <td>
          <input type="text" name="password" id="password">
        </td>
      </tr>
      <tr>
        <td colspan="2" align="center">
          <input type="submit" id="regist" value="注册"/>
        </td>
      </tr>
    </table>
  </form>
</body>
</html>

<%@ page language="java" contenttype="text/html; charset=utf-8"
  pageencoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!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>

  <div>
    <strong> welcome,${sessionscope.user.username}! </strong>
  </div>
  this is success page!

  <a href="${pagecontext.request.contextpath}/user/anotherpage" rel="external nofollow" >点我跳到另一个页面</a>

  <form action="${pagecontext.request.contextpath}/user/login">
    <table>
      <tr>
        <td><input type="submit" value="退出登录"></td>
      </tr>
    </table>
  </form>
</body>
</html>

<%@ page language="java" contenttype="text/html; charset=iso-8859-1"
  pageencoding="iso-8859-1"%>
<!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=iso-8859-1">
<title>insert title here</title>
</head>
<body>
    u are loser,this is a fail page!
</body>
</html>

<%@ 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>

  <div>
    <strong> ${sessionscope.user.username}!!!!! </strong>
  </div>
  <form action="user/outlogin">
    <table>
      <tr>
        <td><input type="submit" value="退出登录" ></td>
      </tr>
    </table>
  </form>
</body>
</html>