# ClassroomReservationSystemForAndroid

**Repository Path**: zyy98/ClassroomReservationSystemForAndroid

## Basic Information

- **Project Name**: ClassroomReservationSystemForAndroid
- **Description**: 大三下Android教室预约系统SSM后台
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 2
- **Forks**: 0
- **Created**: 2019-05-23
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

### 大三下Android教室预约系统SSM后台

- 在gitee添加部署公钥后可用如下脚本在服务器上一键部署：
```bash
git pull
echo "-----pull------"

mv ./out/artifacts/ClassroomReservationSystemForAndroid_war/ClassroomReservationSystemForAndroid_war.war ./out/artifacts/ClassroomReservationSystemForAndroid_war/ClassroomReservationSystemForAndroid.war 
echo "------rename------"

sudo rm -rf /usr/tomcat/apache-tomcat-9.0.6/webapps/ClassroomReservationSystemForAndroid*
echo "------remove old------"

cp ./out/artifacts/ClassroomReservationSystemForAndroid_war/ClassroomReservationSystemForAndroid.war /usr/tomcat/apache-tomcat-9.0.6/webapps/ClassroomReservationSystemForAndroid.war
echo "------copy new------"

sudo chmod -R 775 /usr/tomcat/apache-tomcat-9.0.6/webapps/ClassroomReservationSystemForAndroid*
echo "------chmod------"

```
生成公钥命令
```
ssh-keygen -t rsa -b 4096 -C <your_email@example.com>
```

- 为了和json以及数据库命名规则一致，本项目中的javabean使用匈牙利命名法

- 相同url参数不同返回数据不同的实现方法：
```
   @RequestMapping(value = "/test2",params = "t1")
    @ResponseBody
    public Msg test(@RequestParam(value = "t1")String t1){
        return Msg.success().add("t1",t1);
    }

    @RequestMapping(value = "/test2",params ={"t1","t2"} )
    @ResponseBody
    public Msg test(@RequestParam(value = "t1")String t1,@RequestParam(value = "t2")String t2){
        return Msg.success().add("t1",t1).add("t2",t2);
    }
```
- ArrayList的contains方法原理:底层依赖于equals方法.
HashSet的add()方法和contains方法()底层都依赖 hashCode()方法与equals方法()

- java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
  	at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:460)  
在本地conf/catalina.properties 中添加（适用于8.5以下版本）
```
tomcat.util.http.parser.HttpParser.requestTargetAllow=|{}
```
conf/server.xml(高版本):
```
    <Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" 
			   relaxedPathChars="&quot;'|{}[],:-="
                relaxedQueryChars="&quot;|{}[],':-="/>

```

- spring接收对象参数时不能直接使用@RequestParam，而是@ModelAttribute
```java
    @RequestMapping(value = "/usertest",method = RequestMethod.POST)
    @ResponseBody
    public Msg test2(@ModelAttribute User user) {  //这里不用再加value = "xxx"，传数据直接传user对象的各个字段值即可
        System.out.println(user);
        return Msg.success().add("user", user);
    }
```
> @ModelAttribute与@RequestBody都是用来注解解析前端发来数据，并自动对应到所定义的字段名称。
这里先放结论，使用@ModelAttribute注解的实体类接收前端发来的数据格式需要为"x-www-form-urlencoded"，@RequestBody注解的实体类接收前端的数据格式为JSON(application/json)格式。（若是使用@ModelAttribute接收application/json格式，虽然不会报错，但是值并不会自动填入）

> RESTful 使用POST来创建一个资源，使用PUT或者PATCH来更新一个资源。
区别是：
– PUT用来整体更新一个资源，所以请求中必须包含完整的资源信息。如果缺少部分信息，会导致这部分数据被更新为NULL。
– PATCH则是部分更新。仅更新提供的字段，请求中缺少的字段仍保持不变。

- Mybatis配置文件中大于小于需转义
```<![CDATA[ > ]]>```


### 参考资料
- [相关子查询与不相关子查询](https://blog.csdn.net/shiyong1949/article/details/80923083)
- [Mybatis关系映射](https://www.cnblogs.com/zhaopengcheng/p/7094880.html)
- [Mybatis反向生成及Mybatis实践总结](https://blog.csdn.net/zb408112217/article/details/81284142)
- [Mybatis中resultMap是否可以共享（每个mapper.xml中都要重复定义相同的resultMap吗）](https://blog.csdn.net/lianzhang861/article/details/79475637)
- [mybatis配置文件中小于大于号的处理](https://blog.csdn.net/u022812849/article/details/42123007)
- [spring mvc中请求方式相同url相同参数不相同的两个url方法分开](https://blog.csdn.net/hgx2014/article/details/73162652)
- [ArrayList,HashSet判断对象是否重复的原因](https://blog.csdn.net/fang0321/article/details/83857661)
- [git 几个commit点合并成一个commit点](https://blog.csdn.net/u013276277/article/details/82470177)
- [后台报错java.lang.IllegalArgumentException: Invalid character found in the request target.](https://www.cnblogs.com/dygrkf/p/9088370.html)
- [Tomcat 8 Invalid character found in the request target. The valid characters are defined in RFC 3986](https://yq.aliyun.com/articles/641394)
- [Tomcat 8 is not able to handle get request with '|' in query parameters?](https://stackoverflow.com/questions/41053653/tomcat-8-is-not-able-to-handle-get-request-with-in-query-parameters/51212677#51212677)
- [SpringMVC中@ModelAttribute与@RequestBody的区别](https://blog.csdn.net/qq_42684642/article/details/83058211)
- [REST中更新操作使用PUT，还是PATCH？](https://blog.csdn.net/hxg117/article/details/87877530 )
- [REST API: 该使用部分更新还是全部更新？](https://blog.csdn.net/bychahaha/article/details/53271394)