标签:框架 springframework SSM org import password com public 搭建
刚学完SSM框架,这里用SSM框架来实现操作数据库的功能,话不多说,直接上代码。
在pom.xml中导入所需要的依赖:
<!--spring-mvc核心依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.9.RELEASE</version>
</dependency>
<!--jstl支持-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--servlet编译环境-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<!--jsp编译环境-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<!--fastjson依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.6.RELEASE</version>
</dependency>
<!--用于在测试类中使用-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.1.6.RELEASE</version>
</dependency>
<!--Spring整合Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.5</version>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.6</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.22</version>
</dependency>
<!--德鲁伊连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.20</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
配置mvc.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
<!--注解扫描-->
<!--use-default-filters="false":意思是当扫描com.jpx.controller此包时,类中的所有注解都自动忽略-->
<context:component-scan base-package="com.jpx" use-default-filters="false">
<!--下面这个配置的意思是,只看有Controller注解的类,同时该类中所有的注解都会被识别到,和上面的配合使用-->
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--注解驱动-->
<mvc:annotation-driven>
<!--安装FastJson,转换器-->
<mvc:message-converters>
<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<!--声明转换类型:json-->
<property name="supportedMediaTypes">
<list>
<value>application/json</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 视图解析器
作用:①捕获后端控制器的返回值 eg:value="index"
②解析:在返回值前后拼接形成"/index.jsp" -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/"></property>
<!--后缀-->
<property name="suffix" value=".jsp"></property>
</bean>
<!--额外的增加一个handler,且其requestMapping:"/**" 可以匹配所有的请求,但是优先级最低
所以如果所有其他的handler都匹配不上,请求就会转向"/**",恰好这个handler就是处理静态资源的处理方式:
将请求转到tomcat中默认的servlet。-->
<mvc:default-servlet-handler/>
</beans>
配置application.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd">
<!--配置文件参数化(参数占位符)-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--与DruidDataSource集成-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<!--基本配置-->
<property name="driverClassName" value="${jdbc.driverClass}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!--Druid连接池可选参数-->
<!--配置初始化大小:最小、最大-->
<property name="initialSize" value="${jdbc.init}"/>
<property name="minIdle" value="${jdbc.minIdle}"/>
<property name="maxActive" value="${jdbc.maxActive}"/>
<!--配置获取连接等待超时的时间-->
<property name="maxWait" value="60000"/>
<!--配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒-->
<property name="timeBetweenEvictionRunsMillis" value="60000"/>
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒-->
<property name="minEvictableIdleTimeMillis" value="300000"/>
</bean>
<!--生产:SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--注入连接池-->
<property name="dataSource" ref="dataSource"></property>
<!--注入dao-mapper文件信息,如果映射文件和dao接口同包且同名,则此配置可省略-->
<property name="mapperLocations">
<list>
<value>classpath:com/jpx/dao/*.xml</value>
</list>
</property>
*/
<!--为dao-mapper文件中的实体 定义缺省包路径
如:<select id="queryAll" resultType="User"/>中User类可以不用定义包-->
<property name="typeAliasesPackage" value="com.jpx.entity"></property>
</bean>
<!--管理DAO实现类的创建,并创建DAO对象,存入工厂管理
1.扫描所有dao接口,去构建dao实现;
2.将dao实现存入工厂管理;
3.dao实现对象在工厂中的id是:首字母小写的接口类名,例如:UserDao==>userDao-->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--dao接口所在的包,如果有多个包,可以用逗号或者分号分隔
eg:<property name="basePackage" value="com.a.dao,com.b.dao"></property>-->
<property name="basePackage" value="com.jpx.dao"></property>
<!--如果工厂中只有一个SqlSessionFactory的bean,此配置可省略-->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
<!--告知Spring注解位置,即注解扫描-->
<!--use-default-filters="true":默认为true,意思是当扫描com.jpx.controller此包时,类中的所有注解都扫描-->
<context:component-scan base-package="com.jpx" use-default-filters="true">
<!--下面这个注解的意思是:除了Controller注解的类,所有的注解都扫描,刚好和mvc相反-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--引入一个事务管理器,其中依赖DataSource借以获得连接,进而控制事务逻辑-->
<bean id="tx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置@Transactional-->
<tx:annotation-driven transaction-manager="tx"/>
</beans>
用到的数据库配置文件:jdbc.properties
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/数据库名?serverTimezone=UTC
jdbc.username=root
jdbc.password=root
jdbc.init=1
jdbc.minIdle=1
jdbc.maxActive=3
配置web.xml:
<?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"
id="WebApp_ID" version="3.0">
<display-name>Archetype Created Web Application</display-name>
<!--spring-mvc前端核心控制器
作用:①接收所有前端请求
②启动SpringMVC工厂(mvc.xml)
③负责整个SpringMVC的流程调度
-->
<servlet>
<servlet-name>spring-mvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--初始化参数-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc.xml</param-value>
</init-param>
<!--可选操作。servlet默认是懒加载,添加完load-on-startup就成为了饿汉式加载-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring-mvc</servlet-name>
<!-- 这种方法可以解决静态资源无法访问的问题,但是访问其他资源时需要加上.后缀,过于麻烦-->
<!--<url-pattern>*.action</url-pattern>-->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--用于防止出现中文乱码的过滤器-->
<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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
*/
<!--启动Spring工厂-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
</web-app>
实体类User,类中字段名称最好和数据表中属性同名,便于操作
package com.jpx.entity;
import java.util.Date;
public class User {
private Integer id;
private String username;
private String password;
private int gender;
private Date regist_time;
public User() {
}
public User(Integer id, String username, String password, int gender, Date regist_time) {
this.id = id;
this.username = username;
this.password = password;
this.gender = gender;
this.regist_time = regist_time;
}
public Integer getId() {
return id;
}
public void setId(Integer 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;
}
public int getGender() {
return gender;
}
public void setGender(int gender) {
this.gender = gender;
}
public Date getRegist_time() {
return regist_time;
}
public void setRegist_time(Date regist_time) {
this.regist_time = regist_time;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", gender=" + gender +
", regist_time=" + regist_time +
'}';
}
}
UserDao,定义相关操作
package com.jpx.dao;
import com.jpx.entity.User;
import java.util.List;
public interface UserDao {
List<User> queryUsers();
}
UserDao映射文件UserDaoMapper
<?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.jpx.dao.UserDao">
<select id="queryUsers" resultType="User">
select id,username,password,gender,regist_time
from t_user
</select>
</mapper>
编写UserService
package com.jpx.service;
import com.jpx.entity.User;
import java.util.List;
public interface UserService {
List<User> queryUsers();
}
编写UserService实现类UserServiceImpl
package com.jpx.service.impl;
import com.github.pagehelper.PageHelper;
import com.jpx.dao.UserDao;
import com.jpx.entity.User;
import com.jpx.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
@Override
//将事务控制放在此方法上,此事务控制仅对这个方法有效
@Transactional(propagation = Propagation.SUPPORTS)
public List<User> queryUsers() {
List<User> users = userDao.queryUsers();
return users;
}
}
后端控制器UserController
package com.jpx.controller;
import com.jpx.entity.User;
import com.jpx.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import java.util.List;
@Controller
public class UserController {
@Autowired
@Qualifier("userServiceImpl")
//这属于跨工厂注入,之所以可以这样做是因为
// SpringMVC工厂是Spring的子工厂,所以子工厂可以随意使用父工厂的所有对象
private UserService userService;
@GetMapping("/users")
public String queryUsers(Model model) {
List<User> users = userService.queryUsers();
model.addAttribute("users", users);
return "user";
}
}
用于显示查询结果的jsp页面,user.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %><%--该标签用于格式化--%>
<html>
<head>
<title>用户列表</title>
</head>
<body>
<table width="500px" align="center" border="1px">
<thead>
<tr>
<th>id</th>
<th>username</th>
<th>password</th>
<th>gender</th>
<th>registerTime</th>
</tr>
</thead>
<tbody>
<c:forEach items="${requestScope.users}" var="user">
<tr>
<td>${user.id}</td>
<td>${user.username}</td>
<td>${user.password}</td>
<td>${user.gender}</td>
<td><fmt:formatDate value="${user.regist_time}" pattern="yyyy-MM-dd"/></td>
</tr>
</c:forEach>
</tbody>
</table>
</body>
</html>
到这里一个完整的SSM框架就搭建完成了
剩余一些小问题,如上图所示项目结构,其中UserDao的映射文件UserDaoMappe.xml没有放在resource资源目录中,这就需要我们在pom.xml文件中加入一些配置,如下所示:
<build>
<resources>
<resource>
<!--资源目录-->
<directory>src/main/java</directory>
<includes>
<include>*.xml</include><!--默认,新添加自定义则失效-->
<include>**/*.xml</include><!--新添加,*/代表一级目录**/代表多级目录-->
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
end…
标签:框架,springframework,SSM,org,import,password,com,public,搭建 来源: https://blog.csdn.net/qq_42190335/article/details/112830075
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