I am planning to develop a web application using GWT, but before that I need to make few clarifications. The web app what I am developing should be compatible with Mobile phone browsers considerable smart phone browsers. I googled a lot to know this but I did not find supporting or sufficient documentations. If GWT doesnt support what would be the other framework, which is open source java b
我打算使用GWT开发一个Web应用程序,但在此之前我需要做一些澄清。 我正在开发的网络应用程序应该与手机浏览器相当的智能手机浏览器兼容。 我搜索了很多,知道这一点,但我没有找到支持或足够的文件。 如果GWT不支持其他框架,这是基于开放源码的基于Java的框架? 使用GWT构建移动网站没有什么大问题,它会生成标准的JavaScript + html。 有一些图书馆可以帮助您构建移动网站,例如http://code.google.com/p/gwt-mobile-
I need to read a large text file of around 5-6 GB line by line using Java. How can I do this quickly? A common pattern is to use try (BufferedReader br = new BufferedReader(new FileReader(file))) { String line; while ((line = br.readLine()) != null) { // process the line. } } You can read the data faster if you assume there is no character encoding. eg ASCII-7 but it won
我需要使用Java逐行读取大约5-6 GB的大文本文件。 我该如何快速做到这一点? 一个常见的模式是使用 try (BufferedReader br = new BufferedReader(new FileReader(file))) { String line; while ((line = br.readLine()) != null) { // process the line. } } 如果您认为没有字符编码,您可以更快地读取数据。 例如ASCII-7,但不会有太大的区别。 很可能您对数据所做的处理时间会更长。 编辑:一个
if you needed to build a highly scalable web application using java, what framework would you use and why? I'm just reading thinking-in-java, head first servlets and manning's spring framework boo, but really I want to focus on highly scalable architectures etc. would you use tomcat, hibernate, ehcache? (just assume you have to design for scale, not looking for the 'worry about
如果您需要使用java构建高度可伸缩的Web应用程序,您会使用什么框架,为什么? 我只是在阅读java中的思想,首先是servlet和manning的spring框架,但我真的想关注高度可伸缩的架构等。 你会使用tomcat,hibernate,ehcache吗? (假设你必须为规模设计,而不是在获得流量类型响应时寻找“担心”) 答案取决于我们“可扩展”的含义。 很大程度上取决于您的应用程序,而不是您选择实施的框架。 无论您选择哪种框架,事实是,
Both are terms whose type is the intersection of all types (uninhabited). Both can be passed around in code without failing until one attempts to evaluate them. The only difference I can see is that in Java, there is a loophole which allows null to be evaluated for exactly one operation, which is reference equality comparison ( == )--whereas in Haskell undefined can't be evaluated at all wi
两者都是术语,其类型是所有类型的交集(无人居住)。 两者都可以在代码中传递,而不会失败,直到尝试评估它们为止。 我可以看到的唯一区别是,在Java中,有一个漏洞允许null对一个操作进行评估,这是一个引用相等比较( == ) - 而在Haskell中, undefined根本不能被评估而不会抛出一个例外。 这是唯一的区别吗? 编辑 我真正想要解决这个问题的是,为什么在Java中包含null这样一个显然很差的决定,以及Haskell如何逃避
Possible Duplicate: Ternary conditional operator in Python I've programmed in Java for quite sometime, I'm learning Python in school and I remember in Java for a boolean expression you could do boolean ? (if boolean is true this happens) : (if boolean is false this happens) Is their a way to do the above Java code in Python? And what is the statement above properly called? Yes
可能重复: Python中的三元条件运算符 我已经用Java编写了相当长的一段时间,我在学校学习Python,并且我记得在Java中可以做一个布尔表达式 布尔值? (如果布尔值为true,则会发生):(如果布尔值为false,则会发生) 他们是一种在Python中完成上述Java代码的方法吗? 上面正确的称呼是什么? 是的,你可以使用这个(更pythonic): >>> "foo"'if condition else "bar" 或者,这个(更常见但不推荐): &
This question already has an answer here: What is the maximum length of a URL in different browsers? 16 answers This appears to have been answered already at maximum length of HTTP GET request? You can only safely assume 255 bytes, though some browsers currently support higher numbers. If you need to send more data, consider doing so in the body of a POST request instead. This has been
这个问题在这里已经有了答案: 不同浏览器中URL的最大长度是多少? 16个答案 这似乎已经在HTTP GET请求的最大长度上得到了回答? 尽管一些浏览器目前支持更高的数字,但您只能安全地假设255个字节。 如果您需要发送更多数据,请考虑在POST请求的主体中执行此操作。 这已被回答: 不同浏览器中URL的最大长度是多少? JS会一直运行直到内存不足,但IE相信2K左右的时间会达到顶峰。 请不要那样做btw ...
I have some wsimport generated JAXB classes wsimport -d src/main/java -keep -extension -p my.package http://www.OpenLigaDB.de/Webservices/Sportsdata.asmx?WSDL I will demonstrate the problem with this class (only the @XmlRootElement was added by myself): package my.package; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bi
我有一些wsimport生成的JAXB类 wsimport -d src/main/java -keep -extension -p my.package http://www.OpenLigaDB.de/Webservices/Sportsdata.asmx?WSDL 我将演示这个类的问题(我自己只添加了@XmlRootElement): package my.package; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.an
I'm looking for en efficient system to have a series of read/write locks organized hierarchically to manage access to hierarchically organized resources. If a subtree is locked for write, then no other lock should be able to be obtained in the whole subtree until it is released; similarly, a write lock in a subtree should prevent locking in a parent. Here are the ideas I was contemplating
我正在寻找高效的系统,让一系列读/写锁分层管理,以管理对分层组织资源的访问。 如果一个子树被锁定写入,那么在整个子树中都不能获得其他锁,直到它被释放; 同样,子树中的写入锁应该防止锁定在父项中。 以下是我正在考虑的想法: 使用Apache Commons Transaction 。 不幸的是,该项目自2008年3月以来一直未更新,并已非正式终止。 一些API文档似乎表明版本即将到来(1.3或2.0)将包含某种分层锁定,但无法找到源,看
I "upgraded" some jar files from class file version 49.0 to 50.0 with ProGuard. Because preverification is optional with version 50.0, I wonder if there is a way to check if the class file has really an StackMapTable attribute in it. (It's not that I don't trust ProGuard "[...] The following options upgrade class files to Java 6, by updating their internal version numbe
我使用ProGuard将类文件版本49.0中的一些jar文件“升级”到了50.0。 因为预校验对于版本50.0是可选的,所以我想知道是否有办法检查类文件是否真的具有StackMapTable属性。 (并不是我不相信ProGuard“[...]以下选项将类文件升级到Java 6,方法是更新其内部版本号并对其进行预验证。”但我想了解如何验证StackMapTable。) Javaasist支持查看堆栈映射表。 我碰到的另一个金块是java -XX:-FailOverToOldVerifier -Xverify:所
I'm trying to start Derby in Network server mode from my Java application with default port. Server starts successfully. Now I attempt to connect to a DB called 'myDB' on the server. The connection is established and db.lck gets successfully created. I, then, do a couple of transactions, commit and close the connection, gracefully. I see that db.lck is still there. Then I shutdo
我试图从默认端口的Java应用程序启动网络服务器模式下的Derby。 服务器启动成功。 现在我尝试连接到服务器上的一个名为'myDB'的数据库。 连接建立并且db.lck被成功创建。 然后,我做一些事务,优雅地提交并关闭连接。 我看到db.lck仍然存在。 然后关闭网络服务器。 我希望在所有这些操作结束时删除db.lck文件。 但它仍然存在。 (PS:OS是Windows) 以下是代码: 1)启动服务器: System.setProperty("derb