java代码大全，常用java代码详解：
1. java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. java向文件末尾添加内容
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. java得到当前方法的名字
String methodName = Thread.currentThread().getStackTrace()[1].getMethodName();
4. java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. java使用JDBC链接Oracle
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(); }}
6.java列出文件和目录
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File dir = new File("directoryName");
String[] children = dir.list;
if (children == null) {// Either dir does not exist or is not a directory }
else {for (int i=0; i < children.length; i++) {
// Get filename of file or directory
String 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 objects File[] files = dir.listFiles();
// This filter only returns directories FileFilter fileFilter = new FileFilter { public boolean accept(File file) { return file.isDirectory(); } };
files = dir.listFiles(fileFilter);
7.java解析/读取XML 文件
<?xml version="1.0"?><students><student><name>John</name><grade>B</grade><age>12</age></student><student><name>Mary</name><grade>A</grade><age>11</age></student><student><name>Simon</name><grade>A</grade><age>18</age></student></students>
8. java分页代码实现
public class PageBean {
private int curPage; //当前页
private int pageCount; //总页数
private int rowsCount; //总行数
private int pageSize=10; //每页多少行
public PageBean(int rows){
this.setRowsCount(rows);
if(this.rowsCount % this.pageSize == 0){
this.pageCount=this.rowsCount / this.pageSize;}
else if(rows<this.pageSize){this.pageCount=1;}
else{this.pageCount=this.rowsCount / this.pageSize +1;}}
public int getCurPage() {return curPage;}
public void setCurPage(int curPage) {this.curPage = curPage;}
public int getPageCount() {return pageCount;}
public void setPageCount(int pageCount) {this.pageCount = pageCount;}
public int getPageSize() {return pageSize;3}3
public void setPageSize(int pageSize) {this.pageSize = pageSize;}
public int getRowsCount() {return rowsCount;}
public void setRowsCount(int rowsCount) {this.rowsCount = rowsCount;}}
java分页展示如下
List clist=adminbiz.queryNotFullCourse();//将查询结果存放在List集合里
PageBean pagebean=new PageBean(clist.size());//初始化PageBean对象
//设置当前页
pagebean.setCurPage(page); //这里page是从页面上获取的一个参数，代表页数
//获得分页大小
int pagesize=pagebean.getPageSize();
//获得分页数据在list集合中的索引
int firstIndex=(page-1)*pagesize;
int toIndex=page*pagesize;
if(toIndex>clist.size()){toIndex=clist.size();}
if(firstIndex>toIndex){firstIndex=0;
pagebean.setCurPage(1);}
//截取数据集合，获得分页数据
List courseList=clist.subList(firstIndex, toIndex);
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