前言:
眼前小伙伴们对“javas”大体比较关怀,我们都需要剖析一些“javas”的相关资讯。那么小编同时在网络上网罗了一些关于“javas””的相关内容,希望兄弟们能喜欢,朋友们快快来了解一下吧!目录
一、整体思路
SSM: SpringMVC + Spring + MyBatis.
SpringMVC:视图层,界面层,负责接收请求,显示处理结果的。
Spring:业务层,管理service,dao,工具类对象的。
MyBatis:持久层, 访问数据库的
用户发起请求--SpringMVC接收--Spring中的Service对象--MyBatis处理数据
SSM整合也叫做SSI (IBatis也就是mybatis的前身), 整合中有容器。
第一个容器SpringMVC容器, 管理Controller控制器对象的。第二个容器Spring容器,管理Service,Dao,工具类对象的
我们要做的把使用的对象交给合适的容器创建,管理。 把Controller还有web开发的相关对象交给springmvc容器, 这些web用的对象写在springmvc配置文件中
service,dao对象定义在spring的配置文件中,让spring管理这些对象
springmvc容器和spring容器是有关系的,关系已经确定好了
springmvc容器是spring容器的子容器, 类似java中的继承。 子可以访问父的内容
在子容器中的Controller可以访问父容器中的Service对象, 就可以实现controller使用service对象
实现步骤:使用ssm的mysql库, 表使用student(id auto_increment, name, age)新建maven web项目加入依赖springmvc,spring,mybatis三个框架的依赖,jackson依赖,mysql驱动,druid连接池jsp,servlet依赖写web.xml注册DispatcherServlet ,目的:1.创建springmvc容器对象,才能创建Controller类对象。2.创建的是Servlet,才能接受用户的请求。注册spring的监听器:ContextLoaderListener,目的: 创建spring的容器对象,才能创建service,dao等对象。注册字符集过滤器,解决post请求乱码的问题创建包, Controller包, service ,dao,实体类包名创建好写springmvc,spring,mybatis的配置文件springmvc配置文件spring配置文件mybatis主配置文件数据库的属性配置文件写代码, dao接口和mapper文件, service和实现类,controller, 实体类。写jsp页面二、SSM整合注解开发
需求:完成学生的注册和信息浏览
1. 建立Student2. 建立Web工程
通过maven
3. maven依赖
<?xml version="1.0" encoding="UTF-8"?><project xmlns="; xmlns:xsi="; xsi:schemaLocation=" ;> <modelVersion>4.0.0</modelVersion> <groupId>com.md</groupId> <artifactId>07-ssm</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!--servlet依赖--> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <!-- jsp依赖 --> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2.1-b03</version> <scope>provided</scope> </dependency> <!--springmvc依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--事务--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.9</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.12</version> </dependency> </dependencies> <build> <resources> <resource> <directory>src/main/java</directory><!--所在的目录--> <includes><!--包括目录下的.properties,.xml 文件都会扫描到--> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build></project>4. 定义程序结构5. 编写配置文件
jdbc属性配置文件jdbc.properties
jdbc.url=jdbc:mysql://localhost:3306/ssmjdbc.username=rootjdbc.password=123456jdbc.maxActive=20
Spring配置文件applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="; xmlns:xsi="; xmlns:context="; xsi:schemaLocation=" ;> <!--spring的配置文件,声明service、dao、工具类对象--> <!--注册组件扫描器--> <!--声明service的注解@Service所在的包名位置--> <context:component-scan base-package="com.md.service"/> <!--声明数据源,连接数据库--> <context:property-placeholder location="classpath:conf/jdbc.properties"/> <bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}" /> <property name="maxActive" value="${jdbc.maxActive}" /> </bean> <!--SqlSessionFactory--> <bean id="SqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="myDataSource"/> <property name="configLocation" value="classpath:/conf/mybatis.xml"/> </bean> <!--创建 dao对象--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="SqlSessionFactory"/> <!--指定包名,包名是dao接口所在的包名,dao默认对象的名称:是接口名字的首字母小写--> <property name="basePackage" value="com.md.dao"/> </bean> <!--上面的这个是一个模板,只有一些配置文件的路径是根据自己创建写的--></beans>
SpringMVC的配置文件,dispatcherServlet.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="; xmlns:xsi="; xmlns:context="; xmlns:mvc="; xsi:schemaLocation=" ;> <!-- springmvc的配置文件,声明controller和其他web相关的对象--> <!-- 注册组件扫描器,指定@Controller注解所在的类--> <context:component-scan base-package="com.md.controller"/> <!-- 指定视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <!--注册注解驱动 1. 响应ajax请求,返回json 2. 解决静态资源访问问题 --> <mvc:annotation-driven/></beans>
mybatis的配置文件 , mybatis.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" ";><configuration> <!--<settings>--> <!--<!–设置日志–>--> <!--<setting name="logImpl" value="STDOUT_LOGGING"/>--> <!--</settings>--> <!--设置别名,在mapper.xml文件中,返回值不用在写包名了,直接写类名即可--> <typeAliases> <package name="com.md.domain"/> </typeAliases> <!-- sql映射文件的位置 --> <mappers> <!--name是包名,这个包中所有mapper.xml一次加载 使用package的要求 1. mapper文件名称和dao接口名称必须完全一样 2. mapper文件和dao接口必须在同一目录 --> <package name="com.md.dao"/> </mappers></configuration>6. 定义web.xml
由于自动生成的是这样的,版本太低,需要换成现在高的版本,直接把之前写好的复制过来就行
换成这样
注册 ContextLoaderListener注册 DisatcherServlet注册字符集过滤器同时创建 Spring 的配置文件和 SpringMVC 的配置文件(上面已经创建好了)
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="; xmlns:xsi="; xsi:schemaLocation=" ; version="4.0"> <!--注册中央调度器--> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <!--自定义路径--> <param-value>classpath:conf/dispatcherServlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <!--注册spring监听器--> <context-param> <param-name>contextConfigLocation</param-name> <!--自定义路径--> <param-value>classpath:conf/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--注册字符集过滤器--> <!--声明过滤器,解决post请求乱码的问题--> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <!--设置项目中使用的编码--> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceRequestEncoding</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>forceResponseEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <!--/* : 所有的请求都会先通过这个过滤器--> <url-pattern>/*</url-pattern> </filter-mapping></web-app>7. 实体类
package com.md.domain;/** * @author MD * @create 2020-08-13 20:21 */public class Student { private Integer id; private String name; private Integer age; public Student() { } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", age=" + age + '}'; }}8. Dao接口和映射文件
都在是dao包下,且文件名相同
package com.md.dao;import com.md.domain.Student;import java.util.List;/** * @author MD * @create 2020-08-13 20:22 */public interface StudentDao { int insertStudent(Student student); List<Student> selectStudents();}
StudentDao.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" ";><mapper namespace="com.md.dao.StudentDao"> <insert id="insertStudent" > insert into student(name,age) values(#{name} , #{age}) </insert> <!--设置了别名,这里返回值直接写类名--> <select id="selectStudents" resultType="Student"> select id, name , age from student </select></mapper>9. Service接口和实现类
package com.md.service;import com.md.domain.Student;import java.util.List;/** * @author MD * @create 2020-08-13 20:31 */public interface StudentService { int addStudent(Student student); List<Student> findStudents();}
实现类
package com.md.service.impl;import com.md.dao.StudentDao;import com.md.domain.Student;import com.md.service.StudentService;import org.springframework.stereotype.Service;import javax.annotation.Resource;import java.util.List;/** * @author MD * @create 2020-08-13 20:32 */@Servicepublic class StudentServiceImpl implements StudentService { // 引用数据类型的自动注入@Resource、@Autowired @Resource private StudentDao studentDao; @Override public int addStudent(Student student) { int nums = studentDao.insertStudent(student); return nums; } @Override public List<Student> findStudents() { return studentDao.selectStudents(); }}10. 处理器
在controller包下
package com.md.controller;import com.md.domain.Student;import com.md.service.StudentService;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.servlet.ModelAndView;import javax.annotation.Resource;import java.util.List;/** * @author MD * @create 2020-08-13 20:37 */@Controller@RequestMapping("/student")public class StudentController { // 自动注入 @Resource private StudentService service; // 注册学生 @RequestMapping("/addStudent.do") public ModelAndView addStudent(Student student){ ModelAndView mv = new ModelAndView(); String tips = "注册失败"; // 调用service处理student int nums = service.addStudent(student); if (nums > 0){ tips = "注册成功"; } // 添加数据,指定页面 mv.addObject("tips",tips); mv.setViewName("result"); return mv; } // 处理查询,响应ajax @RequestMapping("/queryStudent.do") @ResponseBody public List<Student> queryStudent(){ List<Student> students = service.findStudents(); // 会被框架转为json的数组 return students; }}11. 首页
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><% String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";%><html><head> <title>功能入口</title> <base href="<%=basePath%>"></head><body> <div align="center"> <h2>SSM整合</h2> <table> <tr> <td> <a href="addStudent.jsp">学生注册</a> </td> </tr> <br> <tr> <td><a href="listStudent.jsp">学生信息</a> </td> </tr> </table> </div></body></html>12. 注册页面
addStudent.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><% String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";%><html><head> <title>学生注册</title> <base href="<%=basePath%>"></head><body> <div align="center"> <form action="student/addStudent.do" method="post"> <table> <tr> <td>姓名:</td> <td><input type="text" name="name"></td> </tr> <tr> <td>年龄:</td> <td><input type="text" name="age"></td> </tr> <tr> <td> </td> <td><input type="submit" value="注 册"></td> </tr> </table> </form> </div></body></html>13. 注册结果
在/WEB-INF/jsp/result.jsp
<%-- Created by IntelliJ IDEA. User: MD Date: 2020/8/13 Time: 20:45 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>Title</title></head><body><h1>注册结果:${tips}</h1></body></html>14. 浏览页面
listStudent.jsp
<%-- Created by IntelliJ IDEA. User: MD Date: 2020/8/13 Time: 21:10 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><% String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";%><html><head> <title>学生信息</title> <base href="<%=basePath%>"> <script type="text/javascript" src="js/jquery-3.4.1.js"></script> <script type="text/javascript" > $(function () { // 在当前的页面加载后执行loadStudent函数 loadStudent(); $("#btn").click(function () { loadStudent(); }); }); // 自定义函数 function loadStudent() { $.ajax({ url:"student/queryStudent.do", type:"get", dataType:"json", success:function (data) { // 清除旧数据 $("#info").html(""); $.each(data,function (i,n) { // 添加新数据 $("#info").append("<tr>") .append("<td>"+n.id+"</td>") .append("<td>"+n.name+"</td>") .append("<td>"+n.age+"</td>") .append("</tr>") }) } }); } </script></head><body> <div align="center"> <table> <thead> <tr> <td>学号</td> <td>姓名</td> <td>年龄</td> </tr> </thead> <tbody id="info"> </tbody> </table> <input type="button" id="btn" value="查询数据"> </div></body></html>
此时再配置Tomcat运行即可,之后再添加新的功能
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