How to extract a string regular expression using java?

This question already has an answer here: How do you access the matched groups in a JavaScript regular expression? 14 answers You should use lazy quantifier ? and capture group () like this. Regex: ${(.*?)} Replacement to do: 1 for first captured group. Regex101 Demo

如何提取使用java的字符串正则表达式?

这个问题在这里已经有了答案: 如何访问JavaScript正则表达式中的匹配组? 14个答案 你应该使用lazy量词? 并像这样捕获组() 。 正则表达式: ${(.*?)} 替换做: 1为第一个被捕获的组。 Regex101演示

Regex how to get everything apart from the first character

This question already has an answer here: How do you access the matched groups in a JavaScript regular expression? 14 answers Java get matches group of Regex 2 answers Javascript: (Originally the question was tagged with Javascript) The regex you have currently captures the value you want, but returns an array. The match without the equal sign is in the second element of the array: var

正则表达式如何让所有的东西都从第一个字符中分离出来

这个问题在这里已经有了答案: 如何访问JavaScript正则表达式中的匹配组? 14个答案 Java获得匹配正则表达式2组答案 Javascript:(最初问题被标记为Javascript) 你目前使用的正则表达式捕获你想要的值,但返回一个数组。 没有等号的匹配在数组的第二个元素中: var str = "username=john903?fullname=john&smith".match(/=([^?]*)/)[1] //str is now "john903" Java: (OP评论他们实际上使用Java) String l

How to escape text for regular expression in Java

Does Java have a built-in way to escape arbitrary text so that it can be included in a regular expression? For example, if my users enter "$5", I'd like to match that exactly rather than a "5" after the end of input. 从Java 1.5开始,是的: Pattern.quote("$5"); 在我看到下面的例子之前, Pattern.quote和Matcher.quoteReplacement之间的Matcher.quoteReplacement并不清楚s.replaceF

如何在Java中为正则表达式转义文本

Java是否有内置的方法来转义任意文本,以便它可以包含在正则表达式中? 例如,如果我的用户输入“$ 5”,我希望在输入结束后匹配它,而不是“5”。 从Java 1.5开始,是的: Pattern.quote("$5"); 在我看到下面的例子之前, Pattern.quote和Matcher.quoteReplacement之间的Matcher.quoteReplacement并不清楚s.replaceFirst(Pattern.quote("text to replace"), Matcher.quoteReplacement("replacement text")); 回应

System.nanoTime vs System.currentTimeMillis

According to its documentation, System.nanoTime returns nanoseconds since some fixed but arbitrary origin time. However, on all x64 machines I tried the code below, there were time jumps, moving that fixed origin time around. There may be some flaw in my method to acquire the correct time using an alternative method (here, currentTimeMillis). However, the main purpose of measuring relative tim

System.nanoTime与System.currentTimeMillis

根据它的文档,System.nanoTime从一些固定但任意的起源时间开始返回纳秒。 但是,在所有的x64机器上,我尝试了下面的代码,有时间跳转,移动了固定的原点时间。 我的方法可能存在一些缺陷,使用替代方法获取正确的时间(这里是currentTimeMillis)。 然而,测量相对时间(持续时间)的主要目的也受到负面影响。 当我比较不同的队列和LMAX的Disruptor时,我发现这个问题试图测量延迟,有时我会得到非常负的延迟。 在这些情

How to create custom java annotation to log method parameters

I am writting JavaEE application and I would like to use and create custom annotation, which will log data, when annotated method will be called. All I would like to do is, that when annotated method is called, code iterate through all passed method parameters and writes to standard output parameter keys and values. Some example: public class Test { @LogMethodData public int sum(int

如何创建自定义Java注释来记录方法参数

我正在撰写JavaEE应用程序,并且我想要使用和创建自定义注释,当注释方法被调用时它将记录数据。 我想要做的是,当调用带注释的方法时,代码遍历所有传递的方法参数并写入标准输出参数键和值。 一些例子: public class Test { @LogMethodData public int sum(int first, int second) { return first + second; } } 我想实现,当一个自定义metod将被@LogMethodData注释时,后面的代码会照顾并记录传递

Java, OpenOffice, Creating Getting document as jsp response as a pdf

This question already has an answer here: How to serve a file with JSP? 4 answers Displaying pdf in jsp 3 answers How to avoid Java code in JSP files? 28 answers Wow!!! Scriptlets in a jsp ... how old school!! Normally, you would do this in a Servlet and not aa jsp . Jsp's are usually used to respond with html, in this instance you are wanting to write binary to the response out

Java,OpenOffice,将获取文档创建为jsp响应作为pdf

这个问题在这里已经有了答案: 如何使用JSP提供文件? 4个答案 在jsp 3中显示pdf的答案 如何避免JSP文件中的Java代码? 28个答案 哇!!! Scripts in a jsp ...多么老派! 通常情况下,你可以在Servlet执行此操作,而不是在jsp执行此操作。 Jsp通常用于用html进行响应,在这种情况下,您希望将二进制文件写入响应输出流。 您可以在jsp中的scriptlet中执行此操作 <% response.getOutputStream().write(...);

DAO calls from the JSP complies the MVC pattern?

This question already has an answer here: How to avoid Java code in JSP files? 28 answers From the design point of view, the solution (2) is better. Your DAO object may not be necessary the same with your presentation object, the model for your user interface. It can be even composed of more DAO objects. Its wrong practice to make DAO calls from JSP, According to MVC pattern , you should

来自JSP的DAO调用符合MVC模式?

这个问题在这里已经有了答案: 如何避免JSP文件中的Java代码? 28个答案 从设计的角度来看,解决方案(2)更好。 您的DAO对象可能不需要与您的演示对象(即用户界面的模型)相同。 它甚至可以由更多的DAO对象组成。 它的错误做法是从JSP进行DAO调用,根据MVC模式,您应该使用JSP作为View,将会有一个由getter和setter组成的模型,即java POJO类。 还有一个控制器 - 一个负责模型和视图之间通信的组件。 用户总是看到

How to convert scriptlets into jstl tags

This question already has an answer here: How to avoid Java code in JSP files? 28 answers All that code you have in the scriptles you have to do it in the java code and pass it to the jsp. I don't know if you are using any framework to do this but this is easy in frameworks like Spring MVC. In your case you should create in java a bean with the properties you need such as isDirectory,

如何将scriptlet转换为jstl标签

这个问题在这里已经有了答案: 如何避免JSP文件中的Java代码? 28个答案 所有你在脚本中的代码你必须在java代码中完成并将它传递给jsp。 我不知道你是否使用任何框架来做到这一点,但在Spring MVC这样的框架中这很容易。 在你的情况下,你应该在java中创建一个具有你需要的属性的bean,比如isDirectory,长度,文件名等等。然后你创建一个这些bean的列表并把它传递给jsp。 最后,您只需使用forEach循环的JSTL(http://d

Access an object in JSP

This question already has an answer here: How to avoid Java code in JSP files? 28 answers Please see @BalusC's excellent answer on the subject: https://stackoverflow.com/a/3180202/2112089 Basically, accessing POJOs is discouraged because it leads to unmaintainable code. It is much better to use JSTL and Expression Language (EL). To do that, here's his example: <%@ taglib u

在JSP中访问一个对象

这个问题在这里已经有了答案: 如何避免JSP文件中的Java代码? 28个答案 请参阅@ BalusC关于此主题的出色答案: https://stackoverflow.com/a/3180202/2112089 基本上,访问POJO是不鼓励的,因为它会导致不可维护的代码。 使用JSTL和表达式语言(EL)会好得多。 要做到这一点,以下是他的例子: <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> ... <table> <c:forEach items

How do I split Java code away from a jsp page in NetBeans?

This question already has an answer here: How to avoid Java code in JSP files? 28 answers I think it will difficult to just get code on this site. Nevertheless, I think since you were able to write all that code, changing to a modular form should be the easy part for you once you get to know about: Servlets Forwarding from Servlet to JSP Try this link: https://danielniko.wordpress.co

如何将Java代码从NetBeans中的jsp页面分离出来?

这个问题在这里已经有了答案: 如何避免JSP文件中的Java代码? 28个答案 我认为在这个网站上获取代码很困难。 尽管如此,我认为既然你可以编写所有的代码,一旦你了解了以后,改为模块化的形式应该是你容易的部分: Servlet的 从Servlet转发到JSP 试试这个链接:https://danielniko.wordpress.com/2012/04/17/simple-crud-using-jsp-servlet-and-mysql/ 那篇文章有一个链接到github项目,它有你需要的所有资源。