Java+Android技巧

来源：互联网发布：java onvif协议编辑：程序博客网时间：2024/04/16 12:25

1、获取所在行

StackTraceElement[] stacks = Thread.currentThread().getStackTrace();           String str = "类名："+stacks[2].getClassName() + "\n函数名：" + stacks[2].getMethodName()          + "\n文件名：" + stacks[2].getFileName() + "\n行号："          + stacks[2].getLineNumber() + "";          MyLogger.d(TAG, str);        MyLogger.d(TAG, Thread.currentThread().getStackTrace()[2].getLineNumber()+"行");

2、获取数据库表

public static String convertDatabaseCharsetType(String in, String type) {String dbUser;if (in != null) {if (type.equals("oracle")) {dbUser = in.toUpperCase();} else if (type.equals("postgresql")) {dbUser = "public";} else if (type.equals("mysql")) {dbUser = null;} else if (type.equals("mssqlserver")) {dbUser = null;} else if (type.equals("db2")) {dbUser = in.toUpperCase();} else {dbUser = in;}} else {dbUser = "public";}return dbUser;}private static void getTables(Connection conn) throws SQLException {DatabaseMetaData dbMetData = conn.getMetaData();ResultSet rs = dbMetData.getTables(null, convertDatabaseCharsetType("root","mysql"), null, new String[]{ "TABLE", "VIEW" });while (rs.next()) {if (rs.getString(4) != null&& (rs.getString(4).equalsIgnoreCase("TABLE") || rs.getString(4).equalsIgnoreCase("VIEW"))) {System.out.println(rs.getString(3).toLowerCase());}}}private static void getTables2(Connection conn) throws SQLException {DatabaseMetaData dbMetData = conn.getMetaData();ResultSet rs = dbMetData.getTables(null, "root", null, new String[]{ "TABLE", "VIEW" });while (rs.next()) {System.out.println(rs.getString(3).toLowerCase());}}

3、Java重启：

public static void restartApplication() throws URISyntaxException, IOException{  final String javaBin = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";  final File currentJar = new File(Start.class.getProtectionDomain().getCodeSource().getLocation().toURI());  if(!currentJar.getName().endsWith(".jar"))    return;  final ArrayList<String> command = new ArrayList<String>();  command.add(javaBin);  command.add("-jar");  command.add(currentJar.getPath());  final ProcessBuilder builder = new ProcessBuilder(command);  builder.start();  System.exit(0);}

4、java管道通讯

public InputStream getInputStream(final FileHeader hd) throws RarException,IOException {final PipedInputStream in = new PipedInputStream(32 * 1024);final PipedOutputStream out = new PipedOutputStream(in);// creates a new thread that will write data to the pipe. Data will be// available in another InputStream, connected to the OutputStream.new Thread(new Runnable() {public void run() {try {extractFile(hd, out);} catch (RarException e) {} finally {try {out.close();} catch (IOException e) {}}}}).start();return in;}

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