我们来整合SSM框架
第一步、
创建一个maven工程。配置Tomcat，并测试是否正常访问HelloWorld.这一步就省略了。不懂得看这个博客：
idea创建maven项目
创建出来是这样的：
我们从这里开始整合ssm。
第二步、
在pom.xml导入依赖，以下依赖是ssm常用的一些依赖，都导进去，没有坏处。
<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> <jackson.version>2.9.0</jackson.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.3.RELEASE</version> </dependency> <!-- aop联盟，提供了aop规范，Spring AOP就是实现了这个规范 --> <dependency> <groupId>aopalliance</groupId> <artifactId>aopalliance</artifactId> <version>1.0</version> </dependency> <!-- aspectj，实现了aop规范，比spring AOP实现的使用起来简单，所以引入它 --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.2</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-dbcp2</artifactId> <version>2.7.0</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.8.0</version> </dependency> <!-- 集成aspectjweaver --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>5.1.3.RELEASE</version> </dependency> <!--spring集成测试 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.1.3.RELEASE</version> </dependency> <!-- mybatis --> <!-- mysql数据库驱动，以及使用的数据源 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!-- mybatis依赖，spring对jdbc的支持，spring集成mybatis以及对事务的支持 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> </dependency> <!-- JSONObject的依赖 --> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency> <dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> <version>1.7.0</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>net.sf.ezmorph</groupId> <artifactId>ezmorph</artifactId> <version>1.0.3</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.6</version> </dependency> <dependency> <groupId>javax.servlet.jsp.jstl</groupId> <artifactId>jstl-api</artifactId> <version>1.2-rev-1</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-spec</artifactId> <version>1.2.5</version> </dependency> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-impl</artifactId> <version>1.2.5</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>2.1.1</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.17</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.17</version> </dependency> </dependencies> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build>
第三步、
创建数据表。创建一个名称为category_的数据表，只有两个字段，一个id, 一个name，id自增。随便插入点数据。
DROP TABLE IF EXISTS `category_`;CREATE TABLE `category_` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;-- ------------------------------ Records -- ----------------------------INSERT INTO `category_` VALUES ('1', 'sadf');INSERT INTO `category_` VALUES ('2', 'safa');INSERT INTO `category_` VALUES ('3', 'adfasdfas');INSERT INTO `category_` VALUES ('4', '张阿道夫');INSERT INTO `category_` VALUES ('5', '违法收费');INSERT INTO `category_` VALUES ('6', '发生的v');INSERT INTO `category_` VALUES ('7', 'sdfsd');INSERT INTO `category_` VALUES ('8', '34535');
第四步、
编写实体类；DAO层；Service层；Controller层。
像我这样，在java文件夹目录下，创建这几个包。
然后在包下创建对应的java文件或配置文件，最终的项目结构是这样的：（那些打马赛克的东西你们用不到，小孩子别看那些。）
接下来开始写实体类：
实体类名称最好见名知意，跟数据表名称要对上。因为使用了lombok插件，所以使用@Data注解，减少代码量。
Category.java
package com.entity;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class Category { private int id; private String name;}
然后是DAO层，这里写的多是接口，只写方法，不实现。
CategoryDao.java
package com.dao;import com.entity.Category;import java.util.List;public interface CategoryDao { public int add(Category category); public void delete(int id); public Category get(int id); public int update(Category category); public List<Category> list();}
然后在DAO层下创建对应的Mapper.xml文件。注意namespace要对上，还有id对应上方法名。
CategoryMapper.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.dao.CategoryDao"> <insert id="add" parameterType="Category" > insert into category_ ( name ) values (#{name}) </insert> <delete id="delete" parameterType="Category" > delete from category_ where id= #{id} </delete> <select id="get" parameterType="_int" resultType="Category"> select * from category_ where id= #{id} </select> <update id="update" parameterType="Category" > update category_ set name=#{name} where id=#{id} </update> <select id="list" resultType="Category"> select * from category_ </select></mapper>
然后是Service层，这里才是你要实现业务的地方。这里也是接口，在impl实现类里才是写真正实现的。这里只实现一个：查询所有数据。
CategoryService.java
package com.service;import com.entity.Category;import java.util.List;public interface CategoryService { List<Category> list();}
然后写实现类。
CategoryServiceImpl.java
package com.service.impl;import com.dao.CategoryDao;import com.entity.Category;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.service.CategoryService;import java.util.List;@Servicepublic class CategoryServiceImpl implements CategoryService { @Autowired CategoryDao categoryDao; @Override public List<Category> list() { return categoryDao.list(); }}
然后写Controller层。
IndexController.java
package com.controller;import com.entity.Category;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.servlet.ModelAndView;import com.service.CategoryService;import java.util.ArrayList;import java.util.List;@Controller@RequestMapping("/")public class IndexController { @Autowired CategoryService categoryService; @RequestMapping("listCategory") public ModelAndView listCategory(){ ModelAndView mav = new ModelAndView(); List<Category> cs= categoryService.list(); // 放入转发参数 mav.addObject("cs", cs); // 放入jsp路径 mav.setViewName("listCategory"); return mav; }}
OK,写到这里，你已经成功一半啦！给自己鼓鼓掌！接下来，我们一鼓作气，写好配置文件并访问数据吧！
第五步、
编写配置文件。
在resources目录下，创建两个配置文件。
注意把数据库，密码，改成自己的，
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:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:annotation-config /> <context:component-scan base-package="com.service" /> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> <property name="url"> <value>jdbc:mysql://localhost:3306/ssm?characterEncoding=UTF-8</value> </property> <property name="username"> <value>root</value> </property> <property name="password"> <value>root</value> </property> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="typeAliasesPackage" value="com.entity" /> <property name="dataSource" ref="dataSource"/> <property name="mapperLocations" value="classpath:com/dao/*.xml"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.dao"/> </bean></beans>
springMVC.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:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> <context:annotation-config/> <context:component-scan base-package="com.controller"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.StringHttpMessageConverter"/> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/> </mvc:message-converters> </mvc:annotation-driven> <mvc:default-servlet-handler /> <!-- 视图定位 --> <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></beans>
最后就是web.xml了。
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" xmlns:web="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"> <!-- spring的配置文件--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- spring mvc核心：分发servlet --> <servlet> <servlet-name>mvc-dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- spring mvc的配置文件 --> <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>mvc-dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app>
第六步、
创建listCategory.jsp文件。在WEB-INF目录下创建jsp文件夹，将jsp文件都放在这里，因为我们在springMVC.xml中配置过的，就不过多解释了。
不知道在哪创建的可以回头看一下我的那个项目路径，根据那个来即可
listCategory.jsp
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2021/5/12 Time: 12:46 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" import="java.util.*"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><html><head> <title>Title</title></head><body><table align='center' border='1' cellspacing='0'> <tr> <td>id</td> <td>name</td> </tr> <c:forEach items="${cs}" var="c" varStatus="st"> <tr> <td>${c.id}</td> <td>${c.name}</td> </tr> </c:forEach></table></body></html>
这里得到数据的思路我就不多说了吧，懂得都懂。就是jsp页面中通过jstl标签来获取到Controller中返回的数据。
OK,到这里，大功告成！启动Tomcat,测试一下。
没问题吧，注意这里的访问路径，http://localhost:8885/listCategory ，不是直接访问jsp页面，是访问controller中的请求路径。ok,就到这吧，
这里有一个小小的改进，就是controller的改变，使用@ResponseBody注解来返回数据，然后前端通过ajax来异步请求数据。
ListController.java
package com.controller;import com.entity.Category;import com.service.CategoryService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;import java.util.List;@Controller@RequestMapping("/")public class ListController { @Autowired CategoryService categoryService; @RequestMapping("list/allCategory") @ResponseBody public List<Category> findAll(){ List<Category> list = categoryService.list(); System.out.println(list.size()); return list; } @RequestMapping("/listall") public String listAll(){ return "listall"; }}
在jsp文件夹下创建listall.jsp页面。
listall.jsp
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2021/5/14 Time: 10:05 To change this template use File | Settings | File Templates.--%><%@ page isELIgnored="false"%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@taglib prefix="f" uri="http://java.sun.com/jsp/jstl/fmt" %><html><head> <title>首页</title></head><body><input type="button" id="btn" value="获取数据"/><table width="80%" align="center"> <tr> <td>id</td> <td>姓名</td> </tr> <tbody id="content"> </tbody></table><script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script><script type="text/javascript"> $(function () { $('#btn').click(function () { $.post("list/allCategory",function (data) { console.log(data); var html = ""; for(var i = 0; i <data.length;i++){ html += "<tr>" + "<td>"+ data[i].id+"</td>"+ "<td>"+ data[i].name+"</td>"+ +"</tr>"; } $('#content').html(html); }) }) })</script></body></html>
然后访问测试listall页面：
先访问list/allCategory请求路径，看看数据是否正常回显。
然后访问listall, 点击一下获取数据，OK,没问题吧，老铁们。
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在向山靠近一点，才发现这座山，好象一位诗人遥望远方，
