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1. 字符串有整型的相互转换
String a = String.valueOf(2); //integer to numeric string int i = Integer.parseInt(a); //numeric string to an int2. 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 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.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
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 6 7 8 9publicPageBean(int rows){ 10 11 this.setRowsCount(rows); 12 if(this.rowsCount % this.pageSize == 0){ 13 this.pageCount=this.rowsCount / this.pageSize; 14 } 15 else if(rows<this.pageSize){ 16 this.pageCount=1; 17 } 18 else{ 19 this.pageCount=this.rowsCount / this.pageSize +1; 20 } 21 } 22 23 24 publicintgetCurPage { 25 return curPage; 26 } 27publicvoidsetCurPage(int curPage) { 28 this.curPage = curPage; 29 } 30publicintgetPageCount { 31 return pageCount; 32 } 33publicvoidsetPageCount(int pageCount) { 34 this.pageCount = pageCount; 35 } 36publicintgetPageSize { 37 return pageSize; 38 } 39publicvoidsetPageSize(int pageSize) { 40 this.pageSize = pageSize; 41 } 42publicintgetRowsCount { 43 return rowsCount; 44 } 45publicvoidsetRowsCount(int rowsCount) { 46 this.rowsCount = rowsCount; 47 } 48 }分页展示如下
1 List clist=adminbiz.queryNotFullCourse;//将查询结果存放在List集合里 2 PageBean pagebean=new PageBean(clist.size);//初始化PageBean对象 3 //设置当前页 4 pagebean.setCurPage(page); //这里page是从页面上获取的一个参数，代表页数 5 //获得分页大小 6 int pagesize=pagebean.getPageSize; 7 //获得分页数据在list集合中的索引 8 int firstIndex=(page-1)*pagesize; 9 int toIndex=page*pagesize; 10 if(toIndex>clist.size){ 11 toIndex=clist.size; 12 } 13 if(firstIndex>toIndex){ 14 firstIndex=0; 15 pagebean.setCurPage(1); 16 } 17 //截取数据集合，获得分页数据 18 List courseList=clist.subList(firstIndex, toIndex);
java代码大全及详解(精心整理Java语言常用代码汇总)
来源：网友投稿 | 栏目: 知识与问答 | 发布时间: 2023-10-18 09:02:56
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