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为书面语言提供统一的字符编码用十六进制(hexadecimal)表示一个字符16bitshttps://docs.oracle.com/javase/tutorial/i18n/text/unicode.html 阅读全文
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xml源码如下 ... 阅读全文
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shuts down an ExecutorService in two phases, first by calling shutdown to reject incoming tasks, and then calling shutdownNow, if necessary, to cancel any lingering tasks: void shutdownAndAwaitTermination(ExecutorService pool) { pool.shutdown(); // Disable new tasks from being submitted try { ... 阅读全文
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private static final int CONNECTION_TIMEOUT = 10000; public static String doHttpGet(String serverURL) throws Exception { HttpParams httpParameters = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT); HttpConnectionParams.... 阅读全文
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如何保证只有一个线程在运行，在启动线程的时候停止之前的线程？实例如下： private volatile Thread udpSendThread;线程：class UdpSender extends Thread { @Override public void run() { if (udpSendThread == null) { return; } // other work } }启动线程： private void startUdpSe... 阅读全文
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Fragment弹出toast，时不时出现getActivity()空指针，具体原因未查到。解决办法： if (null == fragment || !fragment.isAdded()) { return; }原地址http://stackoverflow.com/questions/11631408/android-fragment-getactivity-sometime-returns-null 阅读全文
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public class WifiAutoConnectManager {private static final String TAG = WifiAutoConnectManager.class.getSimpleName();WifiManager wifiManager; // 定义几种加密方式，一种是WEP，一种是WPA，还有没有密码的情况 public enum WifiCipherType { WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID } // 构造函数 ... 阅读全文
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update user set name= '**' where account = 'pon' Error Code: 1175.You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 0.000 secSET SQL_SAFE_UPDATE 阅读全文
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org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 23 in the generated java fileThe method getJspApplicationContext(ServletContext) is undefined for the type JspFactoryStacktrace: org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandle 阅读全文
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解决办法，为远程创建用户并给予权限mysql> CREATE USER 'monty'@'localhost' IDENTIFIED BY 'some_pass';mysql> GRANT ALL PRIVILEGES ON *.* TO 'monty'@'localhost' -> WITH GRANT OPTION;mysql> CREATE USER 'monty'@'%' IDENTIFIED BY 'some_pass';mysql& 阅读全文