老师 这样打为什么不行啊

日志乱码如何处理？以及properties文件乱码如何处理

老师classpath路径是哪里啊？在web项目中好像是WEB-INF 目录下的文件！

老师是不是，总会对应着对于文件+add命令+commit命令啊？也就是说有文件内容变动，就要使用后面的两个命令，彻底删除使用reset恢复后，意味着文件在目录下，之后需要+add命令+commit命令；而只是单单的删除目录下的文件，不管是手动删除文件，还是rm命令删除问题，之前的+add命令+commit命令还是存在的，只需使用checkout命令恢复目录下的文件即可。可以这样理解吧老师？

命令窗口下运行不闪退，批处理文件闪退是什么原因啊

老师，我这边并没有跳转到登录页面，而是后端总是抛异常是什么原因啊

老师，为什么我这里它只是输出了一个txt文件呢？

我的ideal创建项目选择web application没有老师视频里的那两个选项

没有web-inf这个文件夹，是我自己去手动创建一个对吗？

老师，我这边也是空指针异常

图形绘制的时候，调用paint方法，图片加载出来黑色区域怎么回事？

看了很多遍也没听懂, 

1. 为什么使用"DataInputStream"获取不到浏览器的求情? 要换成BufferedReader才可?

2. 为什么使用BufferedReader获取不到POST数据? 要换成InputStream才可以?

/*视频开始*/
.video-box{
    width: 100%;
    height: 299px;
    background-color: red;
}
.video-box>div{
    width: 296px;
    height: 285px;
    background-color: #ffffff;
    float: left;
    margin-bottom: 14px;
    margin-right: 14px;
}
.video-box>div:last-child{
    margin-right: 0;
}

<!--主题开始-->
<div class="content">
       <div class="wrap">
<!--手机开始-->
      <div class="phone">
          <h3 class="title">手机</h3>
          <div class="phone-box">
              <div class="phone-box-left">
                  <a href="#">
                      <img src="images/574c6643ab91c6618bfb2d0e2c761d0b.jpg" alt="">
                  </a>
              </div>
              <div class="phone-box-right">
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
                  <div class="items1">
                      <a href="#">
                          <img src="images/d880ff45a9a3b70527770e01521fc939.jpg"
                               alt="" class="img1">

                          <p class="name2">小米10至尊版</p>
                          <p class="desc2">120X 变焦/120W秒充/120Hz屏幕</p>
                          <p class="price2">5299元起</p>
                      </a>
                  </div>
              </div>
          </div>
          <div class="big-img">
              <a href="#">
                  <img src="images/c3b86ede4dd31d7c126d56fbdde4f855.jpg" alt="">
              </a>
          </div>
      </div>
<!-- 手机结束-->
<!--  家电开始-->
       <div class="elc">
           <h3 class="title">家电</h3>
           <div class="elc-box">
               <div class="items1 items2">
                   <a href="#">
                       <img src="images/f256b81e4233333692eece77ed06ebc2.jpg" alt="">
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                       class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                       class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                       class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                       class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1 items2">
                   <a href="#">
                       <img src="images/f256b81e4233333692eece77ed06ebc2.jpg" alt="">
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                            class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                            class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items1">
                   <a href="#">
                       <img src="images/ef4c68fed730ec26bf2fa0ff620975c5.jpg" alt=""
                            class="img1">
                       <p class="name2">小米11 Ultra</p>
                       <p class="desc2">1/1.12''GN2｜2K四微曲屏</p>
                       <p class="price2">5499元 <del>5999元</del></p>
                   </a>
               </div>
               <div class="items-last">
                   <div></div>
                   <div></div>
               </div>
           </div>
       </div>
       </div>
        <div class="big-img">
               <a href="#">
                   <img src="images/c3b86ede4dd31d7c126d56fbdde4f855.jpg" alt="">
               </a>
           </div>
    <!--    家电结束-->
    <!--视频开始-->
    <div class="video">
        <h3 class="title">视频</h3>
        <div class="video-box">
            <div></div>
            <div></div>
            <div></div>
            <div></div>
        </div>
    </div>
<!--  视频结束-->
       </div>
</div>
<!-- 主题结束-->

视频顶头le？

老师看下这段代码哪出问题了？

goods = [
    {"name": "面包", "mount": 7, "price": 5},
    {"name": "牛奶", "mount": 3, "price": 10},
    {"name": "香蕉", "mount": 1, "price": 12},
    {"name": "大米", "mount": 2, "price": 98}
    ]
def showGoods(x):
    print("--- 商品信息 ---")
    count = 1
    for i in x:
        print(f"{count}" i.get("name") i.get("mount") i.get("price"))
        count += 1
showGoods(goods)

配置没有问题  JDK也下载了 就是

C:\Users\陈英豪i>java
'java' 不是内部或外部命令，也不是可运行的程序
或批处理文件。

C:\Users\陈英豪i>
C:\Users\陈英豪i>java
'java' 不是内部或外部命令，也不是可运行的程序
或批处理文件。

不知道什么原因