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对于ssm框架这里不作详细的说明了,本文是使用spring,springmvc,mybatis.本文采用的是maven构建的。目前主流的一个构建版本管理。开发工具使用的开源的eclipse,当然具体的根据你喜欢的开发工具这个没有强求。
在查阅本文的时候,需要一定的java基础。如果基础不牢,需要多加强。好了,废话不多说了,开始工作。
首先,创建一个maven工程。这个不多说了,如果这个不会的话,是不是需要从开始到放弃了。哈哈……
一:maven项目结构如下图:
二:导入相应的依赖包,具体的pom依赖如下:
<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.ssm-userLogin</groupId>
<artifactId>user-Login</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<description>这是一个ssm的登录注册demo,供学习参考,特别是初学者...相信还是有点帮助的</description>
<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>
<!-- c3po连接池 -->
<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>
三:配置相应的配置,这个对于初学者真的是特别混乱。所以本文这里还是写的很清楚的。那么我这里先从spring的配置开始。
3.1 spring-dao.xml,那么这里其实是spring与数据库的配置,以及与mybatis的整合。具体代码如下,注释已经非常详细了。有的命名喜欢叫spring-mybatis.xml。其实都差不多,不要换件衣服就不认识了。
<?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>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
<!-- c3p0连接池的私有属性 -->
<property name="maxPoolSize" value="30"></property>
<property name="minPoolSize" value="10"></property>
<!-- 关闭连接后不自动commit -->
<property name="autoCommitOnClose" value="false"></property>
<!-- 获取连接超时时间 -->
<property name="checkoutTimeout" value="1000"></property>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"></property>
</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"></property>
<!-- 配置mybatis全局配置文件:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 扫描entity包 使用别名 com.learn.entity.User ->User -->
<property name="typeAliasesPackage" value="com.learn.entity"></property>
<!-- 扫描sql配置文件:mapping需要的xml文件 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</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"></property>
<!-- 给出需要扫描的Dao接口包 -->
<property name="basePackage" value="com.learn.dao"></property>
</bean>
</beans>
3.2:spring事务的配置,事务的配置方式其实有很多种。目前企业中常用的是注解与xml的方式配置,所以这两种配置事务的方式请一定要掌握。其他的事务配置方式,等你自己掌握了足够的知识可以去弄懂。spring-service.xml的具体配置如下:
<?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.learn.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>
3.3 现在就开始配置springmvc的配置。具体代码如下:
<?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.learn.controller" />
</beans>
3.4:配置jdbc,具体代码如下:
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456
3.5:配置log4j日志,具体代码如下:
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
3.6:配置mybatis-config.xml,具体代码如下:
<?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>
四:配置mapper,user-dao.xml具体代码如下:
<?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.learn.dao.UserDao">
</mapper>
五:配置web.xml,具体代码如下:
<?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_2_5.xsd" version="2.5">
<display-name>user-Login</display-name>
<!-- 配置spring -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-*.xml</param-value>
</context-param>
<!-- 配置监听器加载spring -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 配置过滤器,解决post的乱码问题 -->
<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>
<!-- 配置SpringMVC -->
<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/spring-*.xml</param-value>
</init-param>
<!-- 配置springmvc什么时候启动,参数必须为整数 -->
<!-- 如果为0或者大于0,则springMVC随着容器启动而启动 -->
<!-- 如果小于0,则在第一次请求进来的时候启动 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- 所有的请求都进入springMVC -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
至此:ssm框架整合就已经搭建好了。下面开始具体的代码编写。在企业中,一般是先设计sql。那么本文这里sqly就很简单的。就三个字段,id,username,password。仅供参考:
1:实体类的编写 :
package com.learn.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;
}
}
2:dao接口,具体代码如下:
package com.learn.dao;
import org.apache.ibatis.annotations.Param;
import com.learn.entity.User;
public interface UserDao {
/**
* 查找用户名和密码
* @param username 登录用户名
* @param password 密码
* @return
*/
User findByUsername(String username);
/**
* 注册用户和密码
* @param username 用户名
* @param password 密码
* @return
*/
User registerByUsernameAndPassword(@Param("username")String username,
@Param("password")String password);
}
3:写完dao接口,当然是对应的完成user-dao.xml的sql语句。
<?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.learn.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>
</mapper>
4::编写userservice事务,这个是处理数据库的业务逻辑。
package com.learn.service;
import com.learn.entity.User;
//Service层接口
public interface UserService {
//检验用户登录
User checkLogin(String username,String password);
}
5:userServiceImpl业务实现类:
package com.learn.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.learn.dao.UserDao;
import com.learn.entity.User;
import com.learn.service.UserService;
@Service
public class UserServiceImpl implements UserService{
//注入userDao
@Autowired
private UserDao userDao;
/*
* 检验用户登录业务
*
*/
public User checkLogin(String username, String password) {
//调用dao方法
User user = userDao.findByUsername(username);
//对user进行判断
if(user != null && user.getPassword().equals(password)){
return user;
}
return null;
}
}
6:usercontroller控制层:
package com.learn.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.learn.entity.User;
import com.learn.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";
}
}
至此:相应的代码完成了,那么就到前端了。前端这里就不贴出来了…