我试图将文本输出到Java中的资源文件,如下所示:
File file = new File(MLM.class.getClassLoader().getResource("mazes.txt").toString());
BufferedWriter out = new BufferedWriter(new FileWriter(file));
..
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但是因为没有创建资源文件,我得到一个空指针异常.如果不存在此错误,如何先创建空白资源文件?
我想弄清楚我做的是否有问题,或者 Safari(MacOS 或 iOS)是否不支持 CSS 网格,即使他们到处都说支持?
我试过这样的事情:
ul {
list-style-type: none;
text-align: center;
}
.grid {
display: grid;
grid-gap: 20px;
}
.grid-4 {
grid-template-columns: repeat(4, auto);
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<ul class="grid grid-4">
<li class="grid-item">
<img src="http://via.placeholder.com/350x150"/>
<a href="/">Browse Online, Buy in Store</a>
</li>
<li class="grid-item">
<img src="http://via.placeholder.com/350x150"/>
<a href="/">Browse Online, Buy in Store</a>
</li>
<li class="grid-item">
<img src="http://via.placeholder.com/350x150"/>
<a href="/">Browse Online, Buy in Store</a>
</li>
<li class="grid-item">
<img src="http://via.placeholder.com/350x150"/>
<a href="/">Browse Online, Buy in Store</a>
</li>
</ul>Run Code Online (Sandbox Code Playgroud)
它在 Chrome、FF 甚至最新的 Edge 上都可以正常工作,但在 …
我们有一个现有的Android应用程序,该应用程序使用Retrofit连接到服务器并发送和接收JSON。由于将设备更新为Android 4.4.4,因此在尝试连接时出现以下错误:
D/Retrofit(8004): javax.net.ssl.SSLException: Read error: ssl=0x768c5c40: I/O error during system call, Connection reset by peer
D/Retrofit(8004): at com.android.org.conscrypt.NativeCrypto.SSL_read(Native Method)
D/Retrofit(8004): at com.android.org.conscrypt.OpenSSLSocketImpl$SSLInputStream.read(OpenSSLSocketImpl.java:689)
D/Retrofit(8004): at okio.Okio$2.read(Okio.java:136)
D/Retrofit(8004): at okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
D/Retrofit(8004): at okio.RealBufferedSource.indexOf(RealBufferedSource.java:244)
D/Retrofit(8004): at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:191)
D/Retrofit(8004): at com.squareup.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:189)
D/Retrofit(8004): at com.squareup.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:101)
D/Retrofit(8004): at com.squareup.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:676)
D/Retrofit(8004): at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:426)
D/Retrofit(8004): at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:371)
D/Retrofit(8004): at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:466)
D/Retrofit(8004): at com.squareup.okhttp.internal.huc.DelegatingHttpsURLConnection.getResponseCode(DelegatingHttpsURLConnection.java:105)
D/Retrofit(8004): at com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:25)
D/Retrofit(8004): at retrofit.client.UrlConnectionClient.readResponse(UrlConnectionClient.java:73)
D/Retrofit(8004): at retrofit.client.UrlConnectionClient.execute(UrlConnectionClient.java:38)
D/Retrofit(8004): at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:321)
D/Retrofit(8004): at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
D/Retrofit(8004): at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
D/Retrofit(8004): at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
D/Retrofit(8004): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) …Run Code Online (Sandbox Code Playgroud) 我需要在 .NET Core 中裁剪图像。我使用了 ImageSharp、CoreCompat 和 Microsoft.Windows.Compatibility,并扫描了我能找到的所有方法。但是,我仍然找不到裁剪图像的方法。可以调整大小,但不能裁剪。
如何根据左上角的像素位置、宽度和高度在 .NET Core 中裁剪图像?
我需要一个 sh 脚本来删除文件名的前 3 个字符,例如:
"AB file 1.pdf"
"BC file 2.pdf"
"DB file 3.pdf"
"AD file 4.pdf"
...
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到:
"file 1.pdf"
"file 2.pdf"
"file 3.pdf"
"file 4.pdf"
...
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我认为脚本将是这样的:
#!/bin/sh
for i in *.pdf; do
newName= ????
mv $i $newName
done
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我正在尝试访问@RequestBody MYPOJO pojo工作正常的json 对象,但我的 json 数据需要与 pojo 中的变量名称相同并且区分大小写。我从网上找到的最好的在这里,但没有与我的项目同步,我正在使用 spring mvc。那么如何使用 pojo 使我的 json 不区分大小写呢?
我接收json的方式
@RequestMapping(value = "create", method = RequestMethod.POST)
public void createPost(HttpServletRequest req, HttpServletResponse resp, @Valid @RequestBody Post post,
Errors errors) throws CustomException, IOException {
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json数据
function jsonForPost(isEdit, id) {
var post = {};
if (isEdit) {
post.id = id;
}
post.name = $("#name").val();
return JSON.stringify(post);
}
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