# SSM项目实战:Crm信息管理系统
## 1. 系统的功能和简介
* 一个数据管理系统,基于SSM框架进行开发,利用Maven构建和打包。
+ 有登录模块。
+ 对数据的管理功能(CRUD)。
+ 分页的显示。
* > 本项目源于TyCoding开源项目 [SSM](https://github.com/TyCoding/ssm)。
>
> 项目中的所有实现我都通过自己学习后进行编写。
* #### 改进地方:
+ 改进了分页的bug。
+ 添加了拦截器进行权限认证。
+ 添加了数据响应页面倒计时回主页。
+ 添加了显示用户名。
* #### 适用人群:
+ 用于熟悉SSM框架的开发人员。
+ 学习数据的分页。
## 2. 系统的环境搭建
* 本系统通过Maven来进行环境的搭建,Maven的依赖,我已经打包好了,在根目录的tree.txt目录下,也可以通过pom文件来进行查看。
* 文件的目录如下:
<img src="/img/src.png" >
* main项目下是项目的主要实现代码,resources用于存放配置的xml。
* test目录是用于存放测试的Java代码,本例中主要用于测试mapper和service编写是否正确。
* mysql文件已经放在目录下。
* 本系统的搭建环境:
* Java:1.8.0.191
* mysql:8.0.13
* Maven:3.6.0
* Spring:4.2.4
* Mybatis:3.2.8
## 3.注意事项
* 注意mysql连接驱动和mysql的版本,当初我在搭建的时候因为我的Mysql和原作者的Mysql版本不一致,一直无法连接到数据库,抛了异常解决了很久。
* 注意mysql8.0之后jdbc的驱动修改了,在url中需要配置时区:
* ```mysql
jdbc.driver=com.mysql.cj.jdbc.Driverjdbc.
url=jdbc:mysql://localhost:3306/mycrm?
characterEncoding=utf-8&serverTimezone=GMT%2B8&useSSL=false
jdbc.user=root
jdbc.password=root
```
* 要注意通过Maven搭建项目的时候要注意包冲突。
## 4.项目展示
* 首页:username为admin,密码为admin。
* <img src="/img/首页.png" />
* 主页:
* <img src="/img/主页.png" />
* 添加:
* <img src="/img/添加.png" />
## 5.jsp页面说明
* 前端页面:
* <img src="/img/前端页面.png" />
* index为主页,info用于跳转信息页面,list为页面信息显示,save为添加用户的页面,page为导航栏。
*
## 6.分页功能
* 在以前的时候,我们通常是怎么分页的呢?
* 首先通过mysql的limit来进行分页
```mysql
select * from A limit 1,10;
```
* limit表示从第几条到第几条。
* 同时我们需要在前端传入,第几页,一页显示多少条。
* 然后我们通过计算:
* ```Java
通过前端传入的条数,我们需要先对数据库所有符合条件的数据进行查找,除以条数,得出总页数。
然后我们通过传入的(页数-1)*条数得出数据是从第几条开始到第几条结束。
再通过一个对象封装起来,传入前端。
```
* 使用了PageHelper之后,我们就不需要再如此繁琐的进行分页了。
* ```Java
使用PageHelper.startPage(第几页,每页显示多少条);就可以在这段代码之后的下一个查询的数据就会自动分页。
```
* 同样PageHeler里面有一个PageInfo的类可以对数据进行封装,封装的内容和程序中用于封装的page对象内容大体相同。
* 使用PageHelpe我们只需要以下几步:
* 使用PageHelper.startPage(第几页,每页显示多少条);
* 将查询的数据放入PageInfo里面。
* ```
PageInfo info =new PageInfo(查询的数据)
```
* 返回PageInfo或对需要的数据再封装。(程序里面没有用到PageInfo,使用的是自己封装的Page对象,有兴趣的可以试一试)
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