搭建ssm框架(Spring+Springmvc+mybatis) 实现一般性的增删改查

首先创建一个个人信息表来实现增删改查的操作.
创建个人信息表 t_personal

DROP TABLE IF EXISTS `t_personal`;
CREATE TABLE `t_personal` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT '自增id',
  `name` varchar(255) NOT NULL DEFAULT '' COMMENT '名称',
  `age` bigint(3) NOT NULL DEFAULT '0',
  `sex` varchar(1) NOT NULL DEFAULT '' COMMENT '性别',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk COMMENT='个人信息表';

现在已经建立了一个数据库表
接下来建一个maven项目.
记得要创建webapp的maven
项目结构如下:

这里面有一个PrintReqUriFilter.java是因为我没有配置路径拦截并将访问的编码格式改为UTF-8

package com.easyit.ssm.common;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

@WebFilter("/*")
public class PrintReqUriFilter implements Filter{
    private final static Logger log = Logger.getLogger(PrintReqUriFilter.class);

    @Override
    public void destroy() {
        log.info("销毁........");
    }

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) arg0;
        HttpServletResponse response = (HttpServletResponse) arg1;
        String url = request.getRequestURI();
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        arg2.doFilter(arg0, arg1);
        log.info(url);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        log.info("初始化.....");
    }

}

建好后的pom.xml文件如下:

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.easyit</groupId>
  <artifactId>personal</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>personal Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

     <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0</version> 
        <scope>provided</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.2.8</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.26</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.4.1.Final</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.22</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.22</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils -->
    <dependency>
        <groupId>commons-beanutils</groupId>
        <artifactId>commons-beanutils</artifactId>
        <version>1.9.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>personal</finalName>
    <plugins>
      <!-- compiler插件, 设定JDK版本 -->
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>2.5</version>
          <configuration>
              <source>1.8</source>
              <target>1.8</target>
              <showWarnings>true</showWarnings>
          </configuration>
      </plugin>
     </plugins>
  </build>
</project>

然后是jdbc.properties
注意这里是mysql数据库,iphone是你建立t_personal表的数据库,name是数据库的账号,password是账号密码.

driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/iphone
name=root
password=root

接下来是一个log4j.properties文件

# Root logger option
log4j.rootLogger=debug, stdout

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{2}: %m%n

然后是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>
    <!-- 这里会通过log4j将SQL语句处理语句打印出来,非常方便 -->
    <settings>
         <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
    <mappers>
        <mapper resource="personal.xml" />
    </mappers>
</configuration> 

然后对应实体类Personal.java

package com.easyit.ssm.model;

public class Personal {
    private Long id;
    private String name;
    private Long age;
    private String sex;

    public Personal() {
    }

    public Personal(Long id, String name, Long age, String sex) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Long getAge() {
        return age;
    }

    public void setAge(Long age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Personal [id=" + id + ", name=" + name + ", age=" + age + ", sex=" + sex + "]";
    }
}

然后是personal.xml文件

<?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.easyit.ssm.dao.PersonalDao">

    <resultMap type="com.easyit.ssm.model.Personal" id="personalMap">
        <id column="id" property="id"/>
        <result column="name" property="name"/>
        <result column="age" property="age"/>
        <result column="sex" property="sex"/>
    </resultMap>

    <!-- 添加个人信息 -->
    <insert id="insertPersonal">
        insert into t_personal(name,age,sex) values(#{name},#{age},#{sex})
    </insert>

    <!-- 修改年龄 -->
    <update id="updatePersonal">
        update t_personal set age = #{age} where id = #{id}
    </update>

    <!-- 删除个人信息 -->
    <delete id="deletePersonal">
        delete from t_personal where id = #{id}
    </delete>

    <select id="selectPersonalToName" resultMap="personalMap">
        select * from t_personal where name like '${name}'
    </select>

    <select id="selectPersonalToSex" resultMap="personalMap">
        select * from t_personal where sex = #{sex}
    </select>

</mapper>

说明一下#与$处理SQL语句的区别

#{} 表示在预处理中会把参数部分用?占位符,能够防止大量sql语句注入.
${} 表示在动态解析过程中,会直接将数据替代进去,可能会导致大量SQL语句注入

然后是personal.xml的命名空间PersonalDao.java

package com.easyit.ssm.dao;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.easyit.ssm.model.Personal;

public interface PersonalDao {

    // 添加一条个人信息
    int insertPersonal(Personal personal);

    // 修改个人信息
    int updatePersonal(Long id, Long age);

    // 删除个人信息
    int deletePersonal(Long id);

    // 通过名字查询个人信息
    List<Personal> selectPersonalToName(@Param("name") String name);

    // 通过性别查询个人信息
    List<Personal> selectPersonalToAge(String sex);

}

现在配置命名空间Dao接口的xml

dao.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:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    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/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:property-placeholder location="classpath:jdbc.properties" />

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driverClass}"></property>
        <property name="jdbcUrl" value="${url}"></property>
        <property name="user" value="${name}"></property>
        <property name="password" value="${password}"></property>
    </bean>

    <!-- spring sessionFactoryBean 该类实现Spring 的FactoryBean 接口 getObject 返回SqlSessionFactroy对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:mybatis.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- mybatis自动扫描加载Sql映射文件/接口 : MapperScannerConfigurer sqlSessionFactory 
        basePackage:指定sql映射文件/接口所在的包（自动扫描） -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--配置扫描的包位置，扫描会创建该包下面所有接口的Mybatis 映射代理对象  -->
        <property name="basePackage" value="com.easyit.ssm.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

</beans>

然后是代理接口以及代理接口实现类
PersonalService.xml

package com.easyit.ssm.service;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.easyit.ssm.model.Personal;

public interface PersonalService {
    // 添加一条个人信息
    int insertPersonal(Personal personal);

    // 修改个人信息
    int updatePersonal(Long id, Long age);

    // 删除个人信息
    int deletePersonal(Long id);

    // 通过名字查询个人信息
    List<Personal> selectPersonalToName(String name);

    // 通过性别查询个人信息
    List<Personal> selectPersonalToAge(String sex);
}

这里的方法名可以不一样,但是返回值要一样,我就偷懒一波写一模一样的了.

然后是实现类

package com.easyit.ssm.service.impl;

import java.util.List;

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

import com.easyit.ssm.dao.PersonalDao;
import com.easyit.ssm.model.Personal;
import com.easyit.ssm.service.PersonalService;

@Service
public class PersonalServiceImpl implements PersonalService {

    @Autowired
    PersonalDao personalDao;

    @Override
    public int insertPersonal(Personal personal) {
        // 这里是可以写代码出理的
        return personalDao.insertPersonal(personal);
    }

    @Override
    public int updatePersonal(Long id, Long age) {
        // 这里是可以写代码出理的
        return personalDao.updatePersonal(id, age);
    }

    @Override
    public int deletePersonal(Long id) {
        // 这里是可以写代码出理的
        return personalDao.deletePersonal(id);
    }

    @Override
    public List<Personal> selectPersonalToName(String name) {
        // 这里是可以写代码出理的
        return personalDao.selectPersonalToName(name);
    }

    @Override
    public List<Personal> selectPersonalToSex(String sex) {
        // 这里是可以写代码出理的
        return personalDao.selectPersonalToSex(sex);
    }

}

然后是出来代理接口与代理接口实现类的
spring.xml文件

<?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: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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">


    <context:annotation-config />
    <!-- 启动注解扫描 -->
    <mvc:annotation-driven />
    <context:component-scan base-package="com.easyit.ssm.service.impl"></context:component-scan>

</beans>

然后是springmvc.xml配置

<?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: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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 启动MVC扫描 -->
    <mvc:annotation-driven />

    <context:component-scan base-package="com.easyit.shiro.controller"></context:component-scan>

    <!-- 配置视图解析器 -->
    <!-- <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <mvc:view-controller path="/unauthor" view-name="unauthor"/>
    <mvc:view-controller path="/login" view-name="login"/>
    <mvc:view-controller path="/" view-name="login"/>
    <mvc:view-controller path="/register" view-name="register"/>
    <mvc:view-controller path="/add" view-name="addUser"/> -->

</beans>

然后最重要的是web.xml的配置

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">

    <!-- 配置Spring上下文监听器，该监听器WEB启动时，初始化Spring上下文 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!-- 配置文件 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.js</url-pattern>
        <url-pattern>*.css</url-pattern>
        <url-pattern>*.jpg</url-pattern>
        <url-pattern>*.jpeg</url-pattern>
    </servlet-mapping>

    <!-- 配置Spring映射 -->

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml,classpath:dao.xml</param-value>
    </context-param>

</web-app>

然后运行项目(我是用jetty的)
没有报错就表示运行成功了
然后到浏览器上访问如图:

说明就成功了.

然后在简单的描述一下PersonalController.java

package com.easyit.ssm.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.easyit.ssm.service.PersonalService;

@Controller
public class PersonalController {

    @Autowired
    PersonalService personalService;

    @RequestMapping("/add")
    public String personalAdd(/* 参数 */) {

        // 代码操作

        //return "forward:/select";
        return "要跳转的文件路径";
    }

    @RequestMapping("/select")
    public String personalSelect(/* 参数 */){
            // 代码操作
        return "要跳转的文件路径";  
    }
}

controller层中的return也可以使用forward与redirect
详情请参考https://blog.csdn.net/qq_43052309/article/details/82260828