快速上手的SSM整合
在ssm整合之前，需要有spring，springmvc和mybatis的基础。
一：创库创表
create database db4;
use db4;
CREATE TABLE `user` (
`uid` tinyint AUTO_INCREMENT,
`uname` varchar(60),
`usex` varchar(10),
PRIMARY KEY (`uid`)
)
二：创建Web项目
项目结构如下：
三：准备jar包
效果图
百度网盘地址获取jar和完整项目代码：
https://pan.baidu.com/s/1ZKztrvJXFmGMQ383tHqfDQ 提取码：upfk
四：编写配置文件
效果
applicationContext.xml
在WEB-INF目录下创建applicationContext.xml文件，内容如下：
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<import resource="spring-dao.xml">import>
<import resource="spring-mvc.xml">import>
<import resource="spring-service.xml">import>
beans>
spring-dao.xml
在WEB-INF目录下创建spring-dao.xml文件，内容如下：
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="WEB-INF/jdbc.properties"/>
<bean id="driverManagerDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="username" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
bean>
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="driverManagerDataSource"/>
<property name="configLocation" value="WEB-INF/mybatis-config.xml"/>
<property name="typeAliasesPackage" value="com.cht.entity"/>
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com/cht/dao/"/>
bean>
beans>
mybatis-config.xml
<configuration>
<settings>
<setting name="logImpl" value="LOG4J"/>
settings>
configuration>
jdbc.properties
jdbc.user=root
jdbc.password=123456
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db4?characterEncoding=utf-8&serverTimezone=UTC
spring-mvc.xml
<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: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
https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.cht.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
bean>
<mvc:default-servlet-handler/>
<mvc:annotation-driven >
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes" value="text/html;charset=UTF-8"/>
bean>
mvc:message-converters>
mvc:annotation-driven>
beans>
spring-service.xml
<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:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://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/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan base-package="com.cht">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="driverManagerDataSource" />
bean>
<tx:annotation-driven transaction-manager="transactionManager" />
beans>
web.xml
<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">
<servlet>
<servlet-name>dispatcherServletservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>/WEB-INF/applicationContext.xmlparam-value>
init-param>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>dispatcherServletservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
<filter>
<filter-name>CharacterEncodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<init-param>
<param-name>encodingparam-name>
<param-value>utf-8param-value>
init-param>
filter>
<filter-mapping>
<filter-name>CharacterEncodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
web-app>
五：编写程序代码进行测试
效果
编写实体类 entity包下
package com.cht.entity;
public class User {
private Integer uid;
private String uname;
private String usex;
public Integer getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getUsex() {
return usex;
}
public void setUsex(String usex) {
this.usex = usex;
}
@Override
public String toString() {
return "User{" +
"uid=" + uid +
", uname='" + uname + '\'' +
", usex='" + usex + '\'' +
'}';
}
}
UserMapper.java
package com.cht.dao;
import com.cht.entity.User;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserMapper {
List<User> selectAll();
Integer addUser(User user);
}
UserMapper.xml
<mapper namespace="com.cht.dao.UserMapper">
<select id="selectAll" resultType="com.cht.entity.User">
select * from user
select>
<insert id="addUser" parameterType="User">
insert into user values (null,#{uname},#{usex})
insert>
mapper>
UserServices
package com.cht.services;
import com.cht.entity.User;
import java.util.List;
public interface UserServices {
List<User> selectAll();
String addUser(User user);
}
UserServicesImpl
package com.cht.services;
import com.cht.dao.UserMapper;
import com.cht.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
public class UserServicesImpl implements UserServices {
@Autowired
private UserMapper userMapper;
@Override
public List<User> selectAll() {
return userMapper.selectAll();
}
@Transactional
@Override
public String addUser(User user) {
Integer i = userMapper.addUser(user);
//制造异常，看看事务是否发挥作用，如果发挥作用，那么将不会添加成功！！！因为被回滚了！！！当然了，客户端会报500错误
//注意这里不要try catch 否则事务会失效
Integer num = 1/0;
if(i!=0){
return "添加成功";
}else {
return "添加失败";
}
}
}
TestController
package com.cht.controller;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Map;
@Controller
public class TestController {
static Logger logger = Logger.getLogger(TestController.class);
@ResponseBody
@RequestMapping("/message")
public String message(){
logger.info("测试spring-mvc.xml下的消息转换器是否成功解决乱码");
return "你好，我是舞动程序";
}
@RequestMapping("/test")
public String test(String wenben, Map<String,Object> map){
logger.info("测试web.xml下的filter过滤器是否解决乱码");
map.put("wenben",wenben);
return "index";
}
}
UserController
package com.cht.controller;
import com.cht.entity.User;
import com.cht.services.UserServices;
import org.apache.log4j.Logger;
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 java.util.List;
import java.util.Map;
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserServices userServices;
static Logger logger = Logger.getLogger(UserController.class);
@RequestMapping("/query")
public String selectAll(Map<String,Object> map){
logger.info("我进来了");
List<User> users = userServices.selectAll();
for (User user:users) {
System.out.println(user);
}
map.put("username",users);
return "index";
}
@RequestMapping("/addUser")
@ResponseBody
public String addUser(Map<String,Object> map){
User user = new User();
user.setUname("陈哈哈");
user.setUsex("男");
String mes = userServices.addUser(user);
System.out.println(mes);
return mes;
}
}
log4j.properties
log4j.rootLogger=DEBUG,console,file
#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=【%c】-%m%n
#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/wudongchengxu.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=【%p】【%d{yy-MM-dd}】【%c】%m%n
#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
六：编写页面
在web目录下新建两个jsp文件
index.jsp
<%--
Created by IntelliJ IDEA.
User: wudongchengxu
Date: 2021/5/12
Time: 20:47
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>
用户信息：${username}
<br/>
接收表单的值：${wenben}
</body>
</html>
send.jsp
<%--
Created by IntelliJ IDEA.
User: wudongchengxu
Date: 2021/5/12
Time: 20:47
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>
<form action="/test" method="post">
<input type="text" name="wenben"/>
<input type="submit" value="提交">
</form>
</body>
</html>
七：测试
测试UserController下的selectAll
先查看user表有几条记录，如下：
让我们启动Tomcat，然后在地址栏上输入:
http://localhost:8080/user/query即可，如下：
测试UserController下的addUser
测试http://localhost:8080/user/addUser
注意，以上异常是我故意造成的异常，主要是看事务是否发挥作用了，如果发挥作用，那么添加用户时，即使成功添加也会回滚，也就是相当于没添加，让我们查询一下数据库，如下： 
看到没有，不管我怎么刷新，陈哈哈就是没有，其实它已经添加成功了，只是遇到异常回滚了而已，那么也就说明事务配置成功了。
测试TestController下的message方法
http://localhost:8080/message
没有乱码，说明spring-mvc下的消息转换器配置成功。
测试TestController下的message方法test方法
http://localhost:8080/send.jsp
点击提交即可，如下： 
说明web.xml下面字符过滤器其了作用。那么到此，ssm就已经整合成功了。