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- c++
- c语言
- java
jsf(Primeface) 为什么直接访问xhtml不显示UI组件
http://localhost:8080/PrimeFaceCurd/index.xhtml
http://localhost:8080/PrimeFaceCurd/
这两个地址，访问的是同一个页面。
为什么第一个不显示UI组件
第二个却显示？
- python
求教，这里的190行为什么会有意外缩进这个错误，真搞不懂，新手，求教- oracle
- python
- 问答团队
- java
- 开发语言
- eclipse
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n,out;
int c[]=new int[7];
out=0;
char r;
r=' ';
n=in.nextInt();
String array[]=new String[n];
for(int i=0;i<n;i++)
{
array[i]=in.next().intern();
}
for (int i = 0; i < array.length; i++) {
// System.out.println(array[i]);
for(int j=0;j<7;j++)
{
if(j==0|j==2|j==4|j==6)
{
c[j]=(int)array[i].charAt(j)-48;
if(r=='*'&j>=2)
{
c[j]=c[j]*c[j-2];
c[j-2]=0;
}
if(r=='/'&j>=2)
{
c[j]=c[j-2]/c[j];
c[j-2]=0;
}
if(r=='-'&j>=2)
{
c[j]=-c[j];
}
}
if(j==1|j==3|j==5)
{
r=array[i].charAt(j);
}
}
out=c[0]+c[2]+c[4]+c[6];
// System.out.println(c[0]);
// System.out.println(c[2]);
// System.out.println(c[4]);
// System.out.println(c[6]);
// System.out.println(out);
if(out==24)
{
System.out.println("Yes");
}
else
System.out.println("No");
}
}
}
- sql
- mysql
- c语言
- unix
- linux
- centos
- ubuntu
#!/bin/bash
clear
>ip-up.txt
>ip-down.txt
read -p "please input addr" ipc
for i in {1..254}
do
ping -c 2 -W 1 $ipc.$i &>/dev/null
if [ $? -eq 0 ] ; then
echo "$ipc.$i is up" &>/dev/null >>ip-up.txt
else
echo "$ipc.$i is down" &>/dev/null >>ip-down.txt
fi
done
wait
sort -n -k 4 -t . ip-up.txt -o ip-up.txt
cat ip-up.txt
sort -n -k 4 -t . ip-down.txt -o ip-down.txt
cat ip-down.txt
echo "ping test are finished"
这个是慢的那个。。
#!/bin/bash
#V1.0 2019-09-10
#Ping test shell script by tutor
clear
>ip-up.txt
>ip-down.txt
while true;
do
read -p "Please input the ip segment for ping test(like 192.168.100) : " segment
if [ -z $segment ] ; then
segment="192.168.100"
fi
echo -n "the ip segment is ${segment} , are you sure to continue [y/n] ? "
read action
if [ -z $action ] ; then
break
fi
if [ "$action" = "y" ]; then
break
fi
done
echo "ping test is ready to run! "
for i in {1..254}
do
{
ping -c2 -W1 ${segment}.${i} &>/dev/null
if [ $? -eq 0 ]; then
echo "${segment}.$i is up" &>/dev/null >> ip-up.txt
else
echo "${segment}.$i is down" &>/dev/null >> ip-down.txt
fi
}&
done
wait
sort -n -k 4 -t . ip-up.txt -o ip-up.txt
cat ip-up.txt
sort -n -k 4 -t . ip-down.txt -o ip-down.txt
cat ip-down.txt
echo "ping test are finished!"
这个是快的那个
两个脚本速度差距特别大，求大佬解惑。。。拜托了
- javascript
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>test</title>
</head>
<body>
<button>1111</button>
<button>2222</button>
<button>3333</button>
</body>
<script>
for(var i=0;i<3;i++){
document.getElementsByTagName("button")[i].onclick=function(){
alert(i);
}
}
</script>
</html>
为什么点击每个按钮都会弹出3？？
- c++
- 问答团队
- java
今天在使用ssm中分页插件pagehelper时发生一个奇怪的事情
```java
<!--pagehelper-->
<pagehelper.version>5.1.2</pagehelper.version>
<!--pagehelper-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
```
同样的代码，都是用aop实现的
```java
public Object invoke(ProceedingJoinPoint args) throws Throwable{
Object[] params = args.getArgs();
//分页对象
PageBean pageBean=null;
for (Object param : params) {
if(param instanceof PageBean){
pageBean= (PageBean) param;
break;
}
}
//设置分页参数
if(null!=pageBean&&pageBean.isPagination()){
PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
}
//执行方法，得到返回结果
Object result = args.proceed(params);
System.out.println(result);
JsonResponseBody data= (JsonResponseBody) result;
if(null!=pageBean&&pageBean.isPagination()){
if(null==data.getData())
return new JsonResponseBody<>(ResponseStatus.STATUS_602);
List lst= (List) data.getData();
PageInfo pi=new PageInfo(lst);
pageBean.setTotal(pi.getTotal()+"");
return new JsonResponseBody<>(lst,pageBean.getTotal());
}
return new JsonResponseBody<>(data.getData());
}
```
但是有一个方法在切入AOP之后总是报错，如下:
```java
org.springframework.web.util.NestedServletException
```
百度了一下，说是jar包冲突，于是把jar包改成 5.1.0，果然问题解决了，
但是之后我改回5.1.2，结果也不报错了，
原因不明
- python
用的是Jupyter，求大神解答！急！
代码如下：
import numpy as np
t=np.arange(1,10,1)
print(t)
y=0.9*t+np.sin(t)
y
import matplotlib.pyplot as plt
%matplotlib inline
plt.plot(t,y,'db')
model=np.polyfit(t,y,deg=1)
model
t2=np.arange=(-2,12,1)
t2
y2predict=np.polyval(model,t2)
y2predict
plt.plot(t,y,'o',t2,y2predict,'x')
plt.show()
在这里出问题了 报错代码如下
TypeError Traceback (most recent call last)
<ipython-input-8-d0e83e3a8d52> in <module>
1 plt.plot(t,y,'o',t2,y2predict,'x')
----> 2 plt.show()
D:\anaconda\lib\site-packages\matplotlib\pyplot.py in show(*args, **kwargs)
351 """
352 _warn_if_gui_out_of_main_thread()
--> 353 return _backend_mod.show(*args, **kwargs)
354
355
D:\anaconda\lib\site-packages\ipykernel\pylab\backend_inline.py in show(close, block)
41 display(
42 figure_manager.canvas.figure,
---> 43 metadata=_fetch_figure_metadata(figure_manager.canvas.figure)
44 )
45 finally:
D:\anaconda\lib\site-packages\ipykernel\pylab\backend_inline.py in _fetch_figure_metadata(fig)
178 if _is_transparent(fig.get_facecolor()):
179 # the background is transparent
--> 180 ticksLight = _is_light([label.get_color()
181 for axes in fig.axes
182 for axis in (axes.xaxis, axes.yaxis)
D:\anaconda\lib\site-packages\ipykernel\pylab\backend_inline.py in <listcomp>(.0)
181 for axes in fig.axes
182 for axis in (axes.xaxis, axes.yaxis)
--> 183 for label in axis.get_ticklabels()])
184 if ticksLight.size and (ticksLight == ticksLight[0]).all():
185 # there are one or more tick labels, all with the same lightness
D:\anaconda\lib\site-packages\matplotlib\axis.py in get_ticklabels(self, minor, which)
1253 if minor:
1254 return self.get_minorticklabels()
-> 1255 return self.get_majorticklabels()
1256
1257 def get_majorticklines(self):
D:\anaconda\lib\site-packages\matplotlib\axis.py in get_majorticklabels(self)
1205 def get_majorticklabels(self):
1206 """Return this Axis' major tick labels, as a list of `~.text.Text`."""
-> 1207 ticks = self.get_major_ticks()
1208 labels1 = [tick.label1 for tick in ticks if tick.label1.get_visible()]
1209 labels2 = [tick.label2 for tick in ticks if tick.label2.get_visible()]
D:\anaconda\lib\site-packages\matplotlib\axis.py in get_major_ticks(self, numticks)
1376 r"""Return the list of major `.Tick`\s."""
1377 if numticks is None:
-> 1378 numticks = len(self.get_majorticklocs())
1379
1380 while len(self.majorTicks) < numticks:
D:\anaconda\lib\site-packages\matplotlib\axis.py in get_majorticklocs(self)
1281 def get_majorticklocs(self):
1282 """Return this Axis' major tick locations in data coordinates."""
-> 1283 return self.major.locator()
1284
1285 def get_minorticklocs(self):
D:\anaconda\lib\site-packages\matplotlib\ticker.py in __call__(self)
2274 def __call__(self):
2275 vmin, vmax = self.axis.get_view_interval()
-> 2276 return self.tick_values(vmin, vmax)
2277
2278 def tick_values(self, vmin, vmax):
D:\anaconda\lib\site-packages\matplotlib\ticker.py in tick_values(self, vmin, vmax)
2282 vmin, vmax = mtransforms.nonsingular(
2283 vmin, vmax, expander=1e-13, tiny=1e-14)
-> 2284 locs = self._raw_ticks(vmin, vmax)
2285
2286 prune = self._prune
D:\anaconda\lib\site-packages\matplotlib\ticker.py in _raw_ticks(self, vmin, vmax)
2265 low = edge.le(_vmin - best_vmin)
2266 high = edge.ge(_vmax - best_vmin)
-> 2267 ticks = np.arange(low, high + 1) * step + best_vmin
2268 # Count only the ticks that will be displayed.
2269 nticks = ((ticks <= _vmax) & (ticks >= _vmin)).sum()
TypeError: 'tuple' object is not callable
- python
这段代码会出现TypeError: There are no type variables left in dict[{'id': '1001', 'name': '张三', 'english': 100, 'python': 100, 'java': 100}]这个问题，是为什么呢？
```
mode=input('请选择排序方式（1.按英语成绩排序 2.按python成绩排序 3.按java成绩排序 0.按总成绩排序）')
if mode=='1':
student_new.sort(key=lambda a:int(a['english']),reverse=asc_or_desc_bool)
elif mode=='2':
student_new.sort(key=lambda x:int(x['python']),reverse=asc_or_desc_bool)
elif mode=='3':
student_new.sort(key=lambda x:int(x['java']),reverse=asc_or_desc_bool)
elif mode=='0':
student_new.sort(key=lambda x:int(x['english'])+int(x['python'])+int(x['java']),reverse=asc_or_desc_bool)
else:
```
- 小程序
- android
- 人工智能
- 测试用例
- 多彩生活