[Java知识库] SSM整合，实现简单登录（超详细）

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[Java知识库]SSM整合，实现简单登录（超详细）

Spring+Spring MVC+myBatis整合（使用maven）

ssm整合报各种异常，看了众多帖子，都是零零散散，浪费时间，所以自己写了一篇，内含详细目录以及所有代码，无尿点爽文！

一.搭建环境
1.IDEA 2019
2.Maven
3.Spring+Spring MVC+myBatis
4.MySQL,表名为login(id,name,password)三个字段
5.目录结构图(使用的都是login部分) 在这里插入图片描述

二.导入Maven依赖

pom.xml部分

<?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>org.example</groupId>
  <artifactId>ssmDay1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>ssmDay1 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>
    <!-- spring 相关版本 -->
    <spring.version>5.3.2</spring.version>
    <!-- json 相关版本 -->
    <json.version>2.9.0</json.version>
    <!-- mybatis 相关版本 -->
    <mybatis.version>3.5.5</mybatis.version>
    <!-- mybatis 整合 spring 相关版本 -->
    <mybatis-spring.version>2.0.6</mybatis-spring.version>
    <!-- druid 相关版本 -->
    <druid.version>1.2.4</druid.version>
    <!-- c3p0 相关版本 -->
    <c3p0.version>0.9.5.2</c3p0.version>
    <!-- log4j 相关版本 -->
    <log4j.version>2.14.0</log4j.version>
    <!-- slf4j 相关版本 -->
    <slf4j.version>1.7.30</slf4j.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- 导入 servlet 依赖 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>

    <!-- 导入 jsp 依赖 -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
      <scope>provided</scope>
    </dependency>

    <!-- 导入 jstl 依赖 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!-- mysql连接驱动依赖 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>

    <!-- 导入 spring 依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- 导入 springMVC 依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- spring 事务控制依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- spring 对于 jdbc或mybatis的事务控制 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- spring 单元测试依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- 处理 json 数据相关依赖，springMVC默认
    处理 json 依赖 -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>${json.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${json.version}</version>
    </dependency>

    <!-- 文件下载插件，解析 MIME 类型描述的正文 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.4</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>
    <!-- mybatis 依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <!-- mybatis 整合 spring 依赖 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring.version}</version>
    </dependency>
    <!-- druid 数据库连接池依赖 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>
    <!-- c3p0 数据库连接池依赖 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>${c3p0.version}</version>
    </dependency>
    <!-- log4j 日志 -->
    <dependency>
      <groupId>org.apache.logging.log4j
      </groupId
      >
      <artifactId>log4j-core</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
  </dependencies>

  <build>
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>
    <finalName>ssmDay1</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>

三.web.xml部分

<?xml version="1.0" encoding="UTF-8"?>
<web-app
        xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
        version="4.0">
  <!--spring 监听器-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:conf/applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--    前端控制器-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:conf/dispatcherServlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <!--    乱码解析-->
  <filter>
    <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

四.spring配置文件

1.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"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
https://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 https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--组件扫描 service和mapper-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
    <context:component-scan base-package="com.keep.ssm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <context:property-placeholder location="classpath:conf/jdbc.properties"/>
    <bean id="dataSource"
          class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!--连接数据库的必备信息-->
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:conf/mybatis.xml"></property>
    </bean>
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.keep.ssm.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

五.Spring-mvc.xml配置文件

1.dispatcherServlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描-->
    <context:component-scan base-package="com.keep.ssm.controller"/>

    <!--   开启注解-->
    <mvc:annotation-driven/>
    <!--    视图解析-->
    <bean id="resourceViewResolve" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--文件multipart解析器-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--   字符集编码-->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!--    上传文件总大小-->
        <property name="maxUploadSize" value="10240"></property>
        <!--    上传单个文件大小-->
        <property name="maxUploadSizePerFile" value="10240"></property>
    </bean>
    <!--    静态资源访问权限-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
</beans>

六.mybatis.xml

<?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>
    <properties resource="conf/jdbc.properties"></properties>
<!--<typeAliases>-->
<!--    <typeAlias type="com.peng.ssm.domain.login" alias="login"/>-->
<!--    &lt;!&ndash;扫包&ndash;&gt;-->
<!--&lt;!&ndash;    <package name="com.peng.ssm.domain"/>&ndash;&gt;-->
<!--    <typeAlias type="com.peng.ssm.domain.employee" alias="employee"/>-->
<!--</typeAliases>-->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
       <package name="com.keep.ssm.dao"/>
    </mappers>
</configuration>

实体类login.class

1.自动生成get/set方法，提供toString。内含如下字段：
private Integer id;
private String name;
private String password;

七.login.jsp

<form class="form" action="${pageContext.request.contextPath}/user/login" method="post">
    <label>用户名：</label>
    <input type="text" name="name"/><br/>
    <label>密&nbsp;&nbsp;&nbsp;码：</label>
    <input type="text" name="password"/><br/>
    <button type="submit">登录</button><br/>
    <a href="/register.jsp">点击前往注册</a>
</form>

*七.接口实现类的编写

1.sevice接口以及实现类

public interface loginService {
     login logins(login login);

}

@Service("loginService")
public class loginServiceImpl implements loginService {
    @Autowired
    private loginDao loginDao;

    @Override
    public login logins(login login) {
        return loginDao.logins(login);
    }

}

2.dao层接口

public interface loginDao {
     login logins(login login);
}

八.映射文件

1.mapper.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.keep.ssm.dao.loginDao">
    <select id="logins" parameterType="com.keep.ssm.domain.login" resultType="com.keep.ssm.domain.login">
        select * from login where name=#{name} and password=#{password}
    </select>
</mapper>

九.Controller层代码

1.loginController.class

@Controller
@RequestMapping("/user")
public class loginController {
    @Resource
    private loginService loginService;
    @Resource
    private employeeService employeeService;

    //    登入方法
    @RequestMapping(value = "/login", produces = "text/html;charset=UTF-8")
    public ModelAndView loginUser(login login, Model model) {
        login user = loginService.logins(login);
        ModelAndView mv = new ModelAndView();
        if (user != null) {
            mv.addObject("userList",user);
            mv.setViewName("LoginSuccess");
            return mv;
        }
        mv.setViewName("error");
        return mv;
    }