java 单机接口限流处理方案
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2022-10-03
Spring+SpringMVC+MyBatis整合实战(SSM框架)
目录SpringMVCSpringMyBatis项目结构maven配置文件pom.xmlwebapp配置文件web.xmlspring配置文件applicationContext.xmlspring-mvc配置文件spring-mvc.xmlmybatis映射文件AccountMapper.xmlmybatis配置文件(两种整合方法)日志配置文件log4j.properties建表语句Tomcat传递过程
在写代码之前我们先了解一下这三个框架分别是干什么的?
SpringMVC
它用于web层,相当于controller(等价于传统的servlet和struts的action),用来处理用户请求。举个例子,用户在地址栏输入http://网站域名/login,那么springmvc就会拦截到这个请求,并且调用controller层中相应的方法,(中间可能包含验证用户名和密码的业务逻辑,以及查询数据库操作,但这些都不是springmvc的职责),最终把结果返回给用户,并且返回相应的页面(当然也可以只返回json/xml等格式数据)。springmvc就是做前面和后面过程的活,与用户打交道!!
Spring
太强大了,以至于我无法用一个词或一句话来概括它。但与我们平时开发接触最多的估计就是IOC容器,它可以装载bean(也就是我们java中的类,当然也包括service dao里面的),有了这个机制,我们就不用在每次使用这个类的时候为它初始化,很少看到关键字new。另外spring的aop,事务管理等等都是我们经常用到的。
MyBatis
如果你问我它跟鼎鼎大名的Hibernate有什么区别?我只想说,他更符合我的需求。第一,它能自由控制sql,这会让有数据库经验的人(当然不是说我啦~捂脸~)编写的代码能搞提升数据库访问的效率。第二,它可以使用xml的方式来组织管理我们的sql,因为一般程序出错很多情况下是sql出错,别人接手代码后能快速找到出错地方,甚至可以优化原来写的sql。
项目结构
maven配置文件pom.xml
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
webapp配置文件web.xml
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_2_5.xsd" id="WebApp_ID" version="2.5">
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_2_5.xsd" id="WebApp_ID" version="2.5">
spring配置文件applicationContext.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:aop="http://shttp://pringframework.org/schema/aop" xmlns:tx="http://springframework.org/schema/tx" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx.xsd http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:aop="http://shttp://pringframework.org/schema/aop"
xmlns:tx="http://springframework.org/schema/tx"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd
http://springframework.org/schema/tx
http://springframework.org/schema/tx/spring-tx.xsd
http://springframework.org/schema/aop
http://springframework.org/schema/aop/spring-aop.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd">
spring-mvc配置文件spring-mvc.xml
xmlns:mvc="http://springframework.org/schema/mvc" xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/mvc http://springframework.org/schema/mvc/spring-mvc.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd">
xmlns:mvc="http://springframework.org/schema/mvc"
xmlns:context="http://springframework.org/schema/context"
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd
http://springframework.org/schema/mvc
http://springframework.org/schema/mvc/spring-mvc.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd">
mybatis映射文件AccountMapper.xml
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
insert into account(id,name,money) values(#{id},#{name},#{money})
select * from account
mybatis配置文件(两种整合方法)
1.sqlMapConfig.xml直接引入
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
引入方法
public void save(Account account) {
try {
//加载配置文件
InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
//构建会话工厂
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
//创建连接
SqlSession sqlSession = sqlSessionFactory.openSession();
//获取映射对象
AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
//执行方法
mapper.save(account);
//提交连接
sqlSession.commit();
//关闭连接
sqlSession.close();
} catch (IOException exception) {
exception.printStackTrace();
}
}
2.sqlMapConfig-spring.xml使用spring构建连接
sqlMapConfig-spring.xml
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
spring配置注入
注入代码
@Autowired
private AccountMapper accountMapper;
@Override
public void save(Account account) {
accountMapper.save(account);
}
日志配置文件log4j.properties
#
# Hibernate, Relational Persistence for Idiomatic Java
#
# License: GNU Lesser General Public License (LGPL), version 2.1 or later.
# See the lgpl.txt file in the root directory or
#
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=all, stdout
建表语句
create table account(
id int primary key auto_increment,
name varchar(100),
money double(7,2)
)
Tomcat传递过程
1.网页获取表单
save.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
账户名称:
账户金额:
2.Controller层处理请求
AccountController.java
package com.neu.controller;
import com.neu.domain.Account;
import com.neu.service.AccountService;
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.servlet.ModelAndView;
import java.util.List;
@Controller
@RequestMapping("/account")
public class AccountController {
@Autowired
private AccountService accountService;
@RequestMapping(value = "/save",produces = "text/html;charset=UTF-8")
@ResponseBody
public String save(Account account){
accountService.save(account);
System.out.println(account);
return "保存成功";
}
@RequestMapping("/findAll")
public ModelAndView findAll(){
List
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("accountList",accountList);
modelAndView.setViewName("accountList");
return modelAndView;
}
}
3.service层处理业务逻辑
AccountServiceimpl.java
package com.neu.service.impl;
import com.neu.domain.Account;
import com.neu.mapper.AccountMapper;
import com.neu.service.AccountService;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.util.List;
@Service("accountService")
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountMapper accountMapper;
@Override
public void save(Account account) {
// try {
// //加载配置文件
// InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
// //构建会话工厂
// SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
// //创建连接
// SqlSession sqlSession = sqlSessionFactory.openSession();
// //获取映射对象
// AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
// //执行方法
// mapper.save(account);
// //提交连接
// sqlSession.commit();
// //关闭连接
// sqlSession.close();
// } catch (IOException exception) {
// exception.printStackTrace();
// }
accountMapper.save(account);
}
@Override
public List
// try {
// InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
// SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
// SqlSession sqlSession = sqlSessionFactory.openSession();
// AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
// List
// sqlSession.close();
// return accountList;
// } catch (IOException exception) {
// exception.printStackTrace();
// }
return accountMapper.findAll();
}
}
4.mapper与数据库交互
mapper层对数据库进行数据持久化操作,他的方法语句是直接针对数据库操作的,主要实现一些增删改查操作,在mybatis中方法主要与与xxx.xml内相互一一映射
AccountMapper.java
package com.neu.mapper;
import com.neu.domain.Account;
import java.util.List;
public interface AccountMapper {
public void save(Account account);
public List
}
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