向Java文件中添加文本
Updated: Thanks Simone for pointing to exception. I have
changed the code. BufferedWriter out = null; try
{ out = new BufferedWriter(new FileWriter(”
filename”, true)); out.write(”
aString”); } catch (IOException e) {
// error processing code } finally
{ if (out != null) {
out.close();
} }
BufferedWriter out = null;try {out = new BufferedWriter(new
FileWriter(”filename”, true));out.write(”aString”);} catch
(IOException e) {// error processing code} finally {if (out
!= null) {out.close();}}
3. 获取Java现在正调用的方法名
String methodName =
Thread.currentThread().getStackTrace()[1].getMethodName(); String methodName = Thread.currentThread().getStackTrace()[1].getMethodName
();
4. 在Java中将String型转换成Date型
java.util.Date =
java.text.DateFormat.getDateInstance().parse(date String); java.util.Date = java.text.DateFormat.getDateInstance().parse(date
String);or SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy"
); Date date = format.parse( myString ); SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy" );Date date
= format.parse( myString );
5. 通过Java JDBC链接Oracle数据库
public class OracleJdbcTest { String driverClass =
"oracle.jdbc.driver.OracleDriver"; Connection con; public void init
(FileInputStream fs) throws ClassNotFoundException,
SQLException, FileNotFoundException, IOException
{ Properties props = new Properties();
props.load(fs);
String url = props.getProperty
("db.url"); String
userName = props.getProperty("db.user");
String password = props.getProperty
("db.password"); Class.forName(driverClass); con=DriverManager.getConnection(url,
userName, password); } public void fetch() throws SQLException,
IOException {
PreparedStatement ps =
con.prepareStatement("select SYSDATE from dual");
ResultSet rs = ps.executeQuery
(); while
(rs.next()) {
// do the
thing you do }
rs.close();
ps.close();
} public
static void main(String[] args) {
OracleJdbcTest test = new
OracleJdbcTest(); test.init(); test.fetch
(); } }
