风来了

EL存取变量数据的方法很简单，例如：${username}。它的意思是取出某一范围中名称为username的变量。因为我们并没有指定哪一个范围的username，所以它的默认值会先从Page范围找，假如找不到，再依序到Request、Session、Application范围。假如途中找到username，就直接回传，不再继续找下去，但是假如全部的范围都没有找到时，就回传null，当然EL表达式还会做出优化，页面上显示空白，而不是打印输出NULL。属性范围（jstl名称）EL中的名称PagePageScopeRequestRequestScopeSessionSessionScopeAppli Read More

1.“#”主要有三种用途：访问OGNL上下文和Action上下文，#相当于ActionContext.getContext()；可以访问这几个ActionContext中的属性。parameters#parameters.id[0]作用相当于request.getParameter("id")request#request.userName相当于request.getAttribute("userName")session#session.userName相当于session.getAttribute("userName")appli Read More

正想着该如何实现左图片右文字。原来SimpleAdapter可以胜任这个工作。First, if aSimpleAdapter.ViewBinderis available,setViewValue(android.view.View, Object, String)is invoked. If the returned value is true, binding has occurred. If the returned value is false,the following views are then tried in order:A view that implements Che Read More

因为service在默认情况下是在主线程执行的。所以为了方便，正如AsyncTask用来简化我们编写工作线程，android也提供了IntentService用来执行长期运行的服务。 IntentService is a base class forServicesthat handle as... Read More

(1)START_NOT_STICKY If the system kills the service afteronStartCommand()returns,do notrecreate the service, unless there are pending intents to deli... Read More

1 cd ‘你的应用目录’2 af login（之后输入你的邮箱和密码）3 af update ‘你的应用名’相关文档：https://docs.appfog.com/getting-started/af-cli在windows命令提示符文件路径自动完成在输入文件路径时，我们可以只输入文件路径的前一部分，比如cd doc，如果当前目录下有docment文件夹，然后按Tab键就可以自动完成。 Read More

Class used to run a message loop for a thread. Threads by default do not have a message loop associated with them; to create one, callprepare()in the thread that is to run the loop, and thenloop()to have it process messages until the loop is stopped. 1 class LooperThread extends Thread { 2 p... Read More

Handy class for starting a new thread that has a looper. The looper can then be used to create handler classes. Note that start() must still be called.1。看source code (省略部分) 1 public class HandlerThread extends Thread { 2 3 int mTid = -1; 4 Looper mLooper; 5 6 /** 7 * Call bac... Read More

①application/x-www-form-urlencoded : 数据被编码为名称/值对。②multipart/form-data : 数据被编码为一条消息，页上的每个控件对应消息中的一个部分。③text/plain: 数据以纯文本形式进行编码。 1. text/plain是纯文本传输的意思 Read More

There are many things that can go wrong:A class works in Unix but doesn't on Windows (or vice versa)Invalid filenames due to double or missing path separatorsUNC filenames (on Windows) don't work with my home-grown filename utility functionUNC (Universal Naming Convention)通用命名约定。windows目录或文件 Read More