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Advance Java Programs skeleton

Program skeleton for all the chapters in Advance Java, T.Y.B.Sc.I.T., Mumbai University.

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Advance Java Programs skeleton

  1. 1. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java SWINGGENERAL TEMPLATE TO CREATE SWING BASED APPLICATION:import javax.swing.*;import java.awt.*;//import package for eventclass MyFrame extends JFrame implements TypeListener{ GUIComponent cmp; MyFrame(String title) { super(title); setSize(200,200); Container cp=this.getContentPane(); cp.setLayout(new FlowLayout()); //instantiate cmp. cp.add(hello); cmp.addTypeListener(this); //register cmp for event } public void methodName(TypeEvent te) { //logic for event processing } public static void main(String args[]) { MyFrame mf = new MyFrame ("My first frame"); mf.setVisible(true); }}JList:To create a JList: String arr[]={“item1”,”item2” ,”item3” ,”item4” ,”item5”}; JList lst = new JList(arr);To obtain the selected item value/index in the list: To obtain the value of the item selected: Page 1 of 18
  2. 2. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java String s = lst.getSelectedValue().toString(); To obtain the index of the item selected: int ind = lst.getSelectedIndex();For handling list events: Make the class implement the ListSelectionListener(present in javax.swing.event package), and override the valueChangedMethod. public void valueChagned(ListSelectionEvent lse) { perform "logic" }JTable: To create a JTable: String [][]data = { {“data of row 1”}, {“data of row 2”}, {“data of row 3”} }; String []header = {column headers}; JTable jt = new JTable(data,header);JTree To create a tree: //create root node MutableTreeNode root = new DefaultMutableTreeNode(“data”); //Create all the branches MutableTreeNode bnc1 = new DefaultMutableTreeNode(“data”); ... ... ... //create the nodes of the branches bnc1.add(new DefaultMutableTreeNode(“data”), position); ... ... ... //Add the branches to the root root.add(bnc1,position); ... ... Page 2 of 18
  3. 3. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java //Add the root in the tree model DefaultTreeModel tm = new DefaultTreeModel(root); //Add the tree model to the tree. JTree t = new JTree(tm); To obtain the selected path of a tree: String s= t.getSelectionPath().toString(); For handling tree events: Make the class implement the TreeSelectionListener(present in javax.swing.event package), and override the valueChangedMethod. public void valueChagned(TreeSelectionEvent tse) { perform "logic" }JSplitPane To create a split pane: JSplitPane sp = new JSpiltPane(orientation, repaint, comp1,comp2) Where orientation can be: JSplitPane.HORIZONTAL_SPLIT JSplitPane.VERTICAL_SPLIT Repaint is either true or false stating if the component should be re-paint if thespilt pane is re-sized. Comp1 and comp2 are the two components to be added in the splitpane.JTabbedPane: To create a tabbed pane: JTabbedPane tp = new JTabbedPane(); Adding tabs to it: tp.add(“tab title”,comp)JButton:To create a button: JButton jb = new JButton("label");To handle button events: Make the class implement the ActionListener (present in Page 3 of 18
  4. 4. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Javajava.awt.event package), and override the actionPerformed Method. public void actionPerformed(ActionEvent tse) { perform "logic" }JTextField:To create a text box: JTextField tf = new JTextField(int size); SERVLETGENERAL TEMPLATE FOR AN HTML FILE:<html> <body> <form action="MyServlet" method="get"> ADD ALL THE GUI COMPONENTS </form> </body></html>VARIOUS HTML GUI COMPONENT TAGS:For a text box: <input type="text" name="boxName" />For a button: <input type="submit" value="buttonLabel" />For a combo box: <select name="boxName"> <option value="optName1"> Text </option> <option value="optName2"> Text </option> <option value="optName3"> Text </option> </select>For a radio button: <input type="radio" name="buttonName1" value="val1" > text </input> <input type="radio" name="buttonName1" value="val2" > text </input> <input type="radio" name="buttonName1" value="val3" > text </input> Page 4 of 18
  5. 5. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaGENRAL TEMPLATE FOR GENRIC SERVLET:import javax.servlet.*;import java.io.*;public class MyServlet extends GenericServlet { public void init(ServletConfig sc) { } public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException { res.setContentType(“type”) String data=req.getParameter(“compName”) PrintWriter pw=res.getWriter(); PERFORM LOGIC pw.println(answer to logic); pw.close(); } public void destroy( ) { }}GENRAL TEMPLATE FOR HTTP SERVLETimport java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class MyServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException //change from doGet to doPost //if transfer mechanism is HTTP POST. { response.setContentType("text/html"); String data=request.getParameter("obj"); Page 5 of 18
  6. 6. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java PrintWriter pw=response.getWriter(); PERFORM LOGIC pw.print(answer to logic); pw.close(); }} JAVA SERVER PAGES – JSPGENRAL TEMPLATE FOR HTML PAGE:<html> <body> <form action="fileName.jsp" method="get"> ADD ALL THE GUI COMPONENTS </form> </body></html>GENRAL TEMPLATE for JSP TAGS:for printing values/output use expression tag:<%=exp %>for decaling variables and methods:<%! declare %>for writing small java code:<% code %>for importing packages:<% @page import="package name" %> Page 6 of 18
  7. 7. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java JAVA DATABASE CONNECTIVITY – JDBCGENRAL TEMPLATE FOR JDBC BASED PROGRAMimport java.sql.*;class Demo{ public static void main(String args[]) { try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:dsn"); CREATE STATEMENT OBJECT EXECUTE AND PROCESS SQL QUERY PRINT ANSWER con.close(); } catch(Exception e) { System.out.println("Error: "+e); } } }Static SQL Statements:Statement stmt = con.createStatement();for executing DDL (insert/delete/update queries) int ans=stmt.executeUpdate("sql query");for executing DQL (select queries) ResultSet rs = stmt.executeQuery("sql query"); while(rs.next) { print "rs.getDataType("column name")"; }Dynamic SQL Statements:PreparedStatement ps = con.prepareStatement("query with missing elementsreplaced by ? "); Page 7 of 18
  8. 8. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Javafor executing DDL (insert/delete/update queries) int ans=sps.executeUpdate( );for executing DQL (select queries) ResultSet rs = ps.executeQuery( ); while(rs.next) { print "rs.getDataType("column name")"; } Page 8 of 18
  9. 9. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaSQL QUERIES:INSERT: insert into tableName values ( val1,val2, val3, .....)DELETE: delete from tableName where conditionUPDATE: update tableName set columnName = value , columnName = value , ... where conditionSELECT: select columnName, columnName, . . . from tableName where condition JAVA SERVER FACES – JSFGENERAL TEMPLATE FOR CREATING A JSF MANAGED BEAN:import javax.faces.bean.*;@ManagedBean@SessionScopedpublic class MyBean { //declare variables //assign getters and setters to variables. public String logic() { //perform logic if(answer to logic is correct) {return "success";} else {return "fail";} }} Page 9 of 18
  10. 10. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaGENERAL TEMPLATE FOR CREATING A FACELET / JSF PAGE<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html"> <h:body> <h:form> ADD ALL THE COMPONENTS <h:commandButton value="Login" action="#{myBean.logic}"/> </h:form> </h:body></html>JSF FACELET GUI TAGS:Adding a button component <h:commandButton value="label" action="#{courseBean.methodName}"/>Adding a text field component <h:inputText id="name" value="#{myBean.attribute}"/>Adding a password filed component <h:inputText id="name" value="#{myBean.attribute}"/>GENERAL TEMPLATE FOR CREATING NAIVGATION RULES IN JSFCONFIGURATION FILE (faces-config.xml)<faces-config version="2.0" xmlns="http://java.sun.com/xml/ns/javaee"> <navigation-rule> <from-view-id>/index.xhtml</from-view-id> <navigation-case> <from-action>#{myBean.logic}</from-action> <from-outcome>success</from-outcome> <to-view-id>page1.xhtml</to-view-id> </navigation-case> <navigation-case> <from-action>#{myBean.logic}</from-action> <from-outcome>fail</from-outcome> <to-view-id>page2.xhtml</to-view-id> </navigation-case> </navigation-rule></faces-config> Page 10 of 18
  11. 11. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java ENTERPRISE JAVA BEAN – EJBGENERAL TEMPLATE FOR CREATING AN ENTERPRISE BEANpackage myPack;import javax.ejb.Stateless;@Statelesspublic class MyBean { public returnType method(parameters) { PERFORM LOGIC AND RETURN ANSWER } } }GENERAL TEMPLATE FOR CREATING A SERVLET THAT CALLS A BEAN:import myPack.*;import javax.ejb.*;import java.io.*;import javax.servlet.*import javax.servlet.http.*;public class MyServlet extends HttpServlet { @EJB MyBean bean; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); try {dataType var = bean.method(parameters);out.println("Answer: "+var); } } catch(Exception e) { out.println(e); } } } Page 11 of 18
  12. 12. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaGENERAL TEMPLATE FOR CREATING AN HTML FILE<html> <body> <form action="MyServlet" method="get"> ADD ALL THE GUI COMPONENTS </form> </body></html> HIBERNATEGENERAL TEMPLATE FOR CREATING A POJO FOR HIBERNATE:package myPack;import java.io.*;public class MyPojo implements Serializable { //declare variables //provide getters and setters for varaibles. }GENERAL TEMPLATE FOR CREATING A HIBERNATE CONFIGURATION FILE:(hibernate.cfg.xml)<hibernate-configuration> <session-factory> <propertyname="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <propertyname="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <propertyname="hibernate.connection.url">jdbc:mysql://localhost:3306/myDB</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">1234</property> <mapping resource="myPack/MyMapping.hbm.xml"/> </session-factory> </hibernate-configuration> Page 12 of 18
  13. 13. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaGENERAL TEMPLATE FOR CREATING A HIBERNATE MAPPING FILE:(MyMapping.hbm.xml)<hibernate-mapping> <class name="myPack.MyPojo" table="student" catalog="myDB"> <id name="pk property name" type="data type"> <column name="col name"/> <generator class="identity"/> </id> <property name="property name" type="data type"> <column name="col anme" /> </property> </class> </hibernate-mapping>GENERAL TEMPLATE FOR CREATING A JSP PAGE THAT WILL ADDRECORDS INTO DATABASE USING HIBERNATE:<%@ page import="org.hibernate.*, org.hibernate.cfg.*, myPack.*;"%><% SessionFactory sf;Session s;Transaction t=null;sf = new Configuration().configure().buildSessionFactory();s=sf.openSession();try{t=s.beginTransaction();MyPojo st=new MyPojo();USE SETTERS TO SET VALUES OF VARIABLESs.save(st);t.commit();out.println("Record Added!");}catch(RuntimeException e) { t.rollback(); out.println(e);}%> Page 13 of 18
  14. 14. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaGENERAL TEMPLATE FOR CREATING A JSP PAGE THAT WILL RETRIVERECORDS FROM THE DATABASE USING HIBERNATE<%@ page import="org.hibernate.*, org.hibernate.cfg.*, myPack.*, java.util.*;" %><% SessionFactory sf;Session s;sf=new Configuration().configure().buildSessionFactory();s=sf.openSession();Transaction t=null;List <MyPojo> l;try { t=s.beginTransaction(); l = s.createQuery("from MyPojo").list(); Iterator ite=l.iterator(); while(ite.hasNext()) { MyPojo obj=(MyPojo) ite.next(); //print values using getters of varaibles } s.close(); }catch(RuntimeException e) { out.println(e); } %> Page 14 of 18
  15. 15. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java STRUTGENERAL TEMPLATE FOR CREATING A STRUTS ACTION CLASSpackage myPack;import com.opensymphony.xwork2.*;public class MyAction extends ActionSupport{ //declare varaibles//assign getters and setters @Override public String execute() { //perform logic if(answer to logic is correct) return "success"; else return "failure"; }}GENERAL TEMPLATE FOR CREATING A STRUTS CONFIGURATION FILE(struts.xml)<struts><package name="/" extends="struts-default"> <action name="MyAction" class="myPack.MyAction"> <result name="success">/page1.jsp</result> <result name="failure">/page2.jsp</result> </action></package></struts>GENERAL TEMPLATE FOR CREATING A JSP PAGE THAT USES STRUTSTAGLIB AND CALLS A STRUTS ACTION CLASS<%@taglib prefix="s" uri="/struts-tags" %><html> <body> <s:form method="get" action="myPack/MyAction.action"> ADD COMPONENTS </s:form> Page 15 of 18
  16. 16. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java </body></html>GENERAL TAG TEMPLATE FOR STRUTS TAGLIB IN JSP PAGE TO BUILD GUICOMPONENTS:To display value of some property in action class: <s:property value="property name" "/>To display a textbox: <s:textfield name="property name"/>To display a button: <s:submit value="label" /> WEB SERVICESGENERAL TEMPLATE FOR CREATING A WEB SERVICE PROVIDERpackage myPack;import javax.jws.*;import javax.ejb.*;@WebService( )@Stateless()public class MyService { @WebMethod( ) public returnType methodName(@WebParam( ) parameters) { //logic }}GENERAL TEMPLATE FOR CREATING A WEB SERVICE CONSUMERimport java.io.*;import javax.servlet.*;import javax.servlet.http.*;import javax.xml.ws.*;import myPack.*;public class MyServlet extends HttpServlet { @WebServiceRef(wsdlLocation = "WEB- Page 16 of 18
  17. 17. Iram Ramrajkar T.Y.B.Sc.I.T. Advance JavaINF/wsdl/localhost_8080/MyApp/MyService.wsdl") private MyService_Service service; public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { //obatin parameters from the user response.setContentType("text/html"); PrintWriter pw = response.getWriter(); dataType ans=methodName(parameters); pw.println(ans); pw.close(); } private returnType methodName(parameters) { MyService port = service.getMyServicePort(); return port.methodName(parameters); }} JAVA MAILGENERAL TEMPLATE FOR CREATING A SERVLET THAT SENDS MAIL USINGJAVA MAIL APIimport java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.*;import javax.mail.*;import javax.mail.internet.*;public class processMail extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponseresponse) throws ServletException, IOException { String from=request.getParameter("t1"); String emailFrom=request.getParameter("t2"); String emailFromPwd=request.getParameter("t3"); String emailTo=request.getParameter("t4"); Page 17 of 18
  18. 18. Iram Ramrajkar T.Y.B.Sc.I.T. Advance Java String sub=request.getParameter("t5"); String msg=request.getParameter("t6"); PrintWriter pw=response.getWriter(); try { String host="smtp.gmail.com"; String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; Properties prop=System.getProperties(); prop.put("mail.host",host); prop.put("mail.transport.protocol","smtp"); prop.put("mail.smtp.auth","true"); prop.put("mail.smtp.port",465); prop.put("mail.smtp.socketFactory.fallback","false"); prop.put("mail.smtp.socketFactory.class",SSL_FACTORY); Session s = Session.getDefaultInstance(prop, null); Message m = new MimeMessage (s); m.setFrom(new InternetAddress(emailFrom)); m.addRecipient(Message.RecipientType.TO,new InternetAddress(emailTo)); m.setSubject(sub); m.setContent(msg,"text/html"); Transport t = s.getTransport("smtp"); t.connect(host, emailFrom, emailFromPwd); t.sendMessage(m,m.getAllRecipients()); pw.println("Message sent successfully :) "); t.close(); } catch(Exception e) { pw.println(e); } } }GENERAL TEMPLATE FOR AN HTML FILE:<html> <body> <form action="MyServlet" method="get"> ADD ALL THE GUI COMPONENTS </form> </body></html> Page 18 of 18

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