1. 字符串有整型的相互转换

String a = String.valueOf(2); //integer to numeric stringint i = Integer.parseInt(a); //numeric string to an int

2. 向文件末尾添加内容

BufferedWriter out = ;try {out = new BufferedWriter(new FileWriter(”filename”, true));out.write(”aString”);} catch (ioException e) {// error processing code} finally {if (out != ) {out.close;}}

3. 得到当前方法的名字

String methodName = Thread.currentThread.getStackTrace[1].getMethodName;

4. 转字符串到日期

java.util.Date = java.text.DateFORMat.getDateInstance.parse(date String);或者是：SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd" );Date date = format.parse( myString );

5. 使用JDBC链接oracle

public classOracleJdbcTest{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;}publicstaticvoidmain(String[] args){OracleJdbcTest test = new OracleJdbcTest;test.init;test.fetch;}}

6.列出文件和目录

File dir = new File("directoryName");String children = dir.list;if (children == ) {// Either dir does not exist or is not a directory} else {for (int i=0; i < children.length; i++) {// Get filename of file or directoryString filename = children[i];}}// It is also possible to filter the list of returned files.// This example does not return any files that start with `.'.FilenameFilter filter = new FilenameFilter {public boolean accept(File dir, String name) {return !name.startsWith(".");}};children = dir.list(filter);// The list of files can also be retrieved as File objectsFile files = dir.listFiles;// This filter only returns directoriesFileFilter fileFilter = new FileFilter {public boolean accept(File file) {return file.isDirectory;}};files = dir.listFiles(fileFilter);

7.解析/读取XML 文件

JohnB12MaryA11SimonA18

8. java分页代码实现

1 public class PageBean {2 private int curPage; //当前页3 private int pageCount; //总页数4 private int rowsCount; //总行数5 private int pageSize=10; //每页多少行6789publicPageBean(int rows){1011 this.setRowsCount(rows);12 if(this.rowsCount % this.pageSize == 0){13 this.pageCount=this.rowsCount / this.pageSize;14 }15 else if(rows24 publicintgetCurPage {25 return curPage;26 }27publicvoidsetCurPage(int curPage) {28 this.curPage = curPage;

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来源地址：https://blog.csdn.net/dageliuqing/article/details/127405259