Coming from a background in Django, I often use "template inheritance", where multiple templates inherit from a common base. Is there an easy way to do this in JSP? If not, is there an alternative to JSP that does this (besides Django on Jython that is :) base template <html> <body> {% block content %} {% endblock %} </body> <html> basic content
来自Django的背景，我经常使用“模板继承”，其中多个模板从一个公共基础继承。 有没有简单的方法在JSP中做到这一点？ 如果没有，是否有替代JSP这样做（除了Jython上的Django :) 基本模板 <html> <body> {% block content %} {% endblock %} </body> <html> 基本内容 {% extends "base template" %} {% block content %} <h1>{{ content.title }} <-- Fills in a variable<
To make sure that a Lock is unlocked, it is adviced to call the unlock() method from inside a finally-clause: lock.lock(); try{ // critical section which may throw exceptions } finally { lock.unlock(); } This is to avoid a possible deadlock, in case an exception is thrown from the code in the critical section. Why isn't the same practice adviced for binary semaphores in equivalent sce
为了确保Lock被解锁，建议从finally子句中调用unlock()方法： lock.lock(); try{ // critical section which may throw exceptions } finally { lock.unlock(); } 这是为了避免可能的死锁，以防从关键部分的代码抛出异常。 为什么在等效场景中对于二元信号量不同意的做法？ mutex.acquire(); try{ // critical section which may throw exceptions } finally { mutex.release(); } 因为对于二进制信号量的等待成功
With Joda Time, you are able to do a really cool things, for example: package temp; import org.joda.time.DateTime; import org.joda.time.DateTimeComparator; import org.joda.time.DateTimeFieldType; public class TestDateTimeComparator { public static void main(String[] args) { //Two DateTime instances which have same month, date, and hour //but different year, minutes and se
随着乔达时间，你可以做一个非常酷的事情，例如： package temp; import org.joda.time.DateTime; import org.joda.time.DateTimeComparator; import org.joda.time.DateTimeFieldType; public class TestDateTimeComparator { public static void main(String[] args) { //Two DateTime instances which have same month, date, and hour //but different year, minutes and seconds DateTime
I have somoe C# source code that I want to be available for java applications under linux OS. How can I call some C# method from java code? I have found http://www.mono-project.com/Java but this looks like writing java code in .net environment. It is not what I look for. Rather I need to create new java library that will expose all functionality from C# code, the new library must be execute
我有很多C＃源代码，我希望在Linux操作系统下可用于Java应用程序。 我如何从java代码中调用一些C＃方法？ 我找到了http://www.mono-project.com/Java，但是这看起来像在.net环境中编写java代码。 这不是我所追求的。 相反，我需要创建一个新的Java库，它将公开来自C＃代码的所有功能，新的库必须在纯Java环境中执行。 也许这对IKVM是可能的，我不确定。 使用Mono在您选择的Linux平台上编译您的C＃类; 使用JNI在你的ja
I have written a Java server application that runs on a standard virtual hosted Linux solution. The application runs all the time listening for socket connections and creating new handlers for them. It is a server side implementation to a client-server application. The way I start it is by including it in the start up rc.local script of the server. However once started I do not know how to a
我编写了一个运行在标准虚拟托管Linux解决方案上的Java服务器应用程序。 应用程序一直运行侦听套接字连接并为它们创建新的处理程序。 它是客户端 - 服务器应用程序的服务器端实现。 我启动它的方式是将它包含在启动服务器的rc.local脚本中。 但是一旦启动，我不知道如何访问它来停止它，如果我想安装更新，那么我必须重新启动服务器才能重新启动应用程序。 在Windows PC上，对于这种类型的应用程序，我可能会创建一个Wind
I read up on fileoutputstream and android internal storage and had a clarifying question. I know that internal storage is stored in data/data/packageName/files. What would be the package name if you have multiple packages in your Android application. Would it just be the package that contains the activity from where you called openFileOutput(...)? I know that internal storage is stored in da
我读了fileoutputstream和android内部存储，并有一个澄清的问题。 我知道内部存储存储在data / data / packageName / files中。 如果您的Android应用程序中有多个软件包，那么软件包的名称是什么？ 它只是包含来自您称为openFileOutput（...）的活动的包吗？ 我知道内部存储存储在data / data / packageName / files中 不总是。 对于具有二级帐户的Android 4.2+平板电脑，内部存储位于其他位置（尽管我忘记了路径）。
I am using processing.core.* for some simple graphics app for android. This is what my code usually looks like: package com.example.ball; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import android.os.Bundle; import android.app.Activity; import android.content.Context; im
我正在使用processing.core.*为一些简单的图形应用程序的Android。 这是我的代码通常看起来像： package com.example.ball; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.view.Menu
In Java 8, is it better for interface or abstract class to define APIs returning CompletableFuture instead of returning Future ? Considering it is ugly converting Future to CompletableFuture and the fact that CompletableFuture will give the caller more flexibility of using functional style directly, what could be a good reason for an API to just return Future ? My 2 cts: by returning a Futur
在Java 8中，接口或抽象类更好地定义返回CompletableFuture而不是返回Future API？ 考虑到它很难将Future转化为CompletableFuture ，而且CompletableFuture会给调用者更直接的使用功能风格的灵活性，API可以返回Future原因是什么？ 我的2 cts： 通过返回一个未来，你可以保持你的选择开放，并可以返回一个未来，或一个CompletableFuture - 从调用者的角度来看没有什么不同。 通过返回一个CompletableFuture，你给调用者
Im new to these frameworks (Vaadin:7.6.1, Spring Security:4.0.3) and I'm asking myself how to configure the authorized requests if I want to build a Vaadin application. I looked up a few examples where something like this is written: @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { [...] @Override protected void configure(HttpSecurity http
我是这些框架的新手（Vaadin：7.6.1，Spring Security：4.0.3），我自问如何配置授权请求，如果我想构建一个Vaadin应用程序。 我查了几个例子，写这样的东西： @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { [...] @Override protected void configure(HttpSecurity http) throws Exception { http .authorizeRequests() .a
I was reviewing one of the Oracle trails on Java generics, entitled "Effects of Type Erasure and Bridge Methods", and I could not convince myself of an explanation given. Curious, I tested the code locally and I could not even reproduce the behavior which the trail explains. Here is the relevant code: public class Node<T> { public T data; public Node(T data) { this.dat
我正在审查Java泛型的Oracle着作之一，名为“类型擦除和桥接方法的影响”，我无法说服自己给出解释。 好奇的是，我在本地测试了这些代码，甚至无法重现线索解释的行为。 这里是相关的代码： public class Node<T> { public T data; public Node(T data) { this.data = data; } public void setData(T data) { System.out.println("Node.setData"); this.data = data; } } public class