b13 ltm láºp trÃ¬nh nÃ¢ng cao jsp-java-tomcat-ws vá»›i pattern j2ee

8/3/2019 b13 LTM L p trnh nng cao JSP-Java-Tomcat-WS vi pattern J2EE

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Lp trnh mngJ2EE patterns

Ging vin: TS. Nguyn Mnh Hng

Hc vin Cng ngh Bu chnh Vin thng (PTIT)


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2

Ni dung

Gii thiu v J2EE patterns Lp trnh web vi JSP Java - Tomcat Lp trnh web s dng web service Struts framework Bi tp


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J2EE patterns


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Kin trc J2EE vi WS

[image source: http://media.wiley.com/]


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[image source:http://java.sun.com/]


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Cc nhm patterns

Bean (EJB): entity bean, session bean,

message-driven bean Object (control of object): DAO, transfer

object Control: delegate, front control, service

locator/handler View: view helper, dispatcher view


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Lp trnh web vi JSP


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Java JSP - Tomcat

DB

BeanDAO

Control

x.JSP doX.JSP


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V d: login trn web

DB

entity.Userdao.UserDAO

Home.jsp doLogin.jsp UserHome.jsp


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Ci t server Tomcat (1)

Bc 1: Ci t mi trng JDK, tomcat v axis:

Gii nn tp tin jakarta-tomcat-4.0.6.zip ti C:\Webservice\jakarta-

tomcat-4.0.6Gii nn tp tin xml-axis-beta1.zip ti C:\Webservice\xml-axis-beta1

Ci t JDK ti C:\Program Files\Java\jdk1.6.0_21

Copy th mc axis (C:\Webservice\xml-axis-beta1\webapps\axis)

vo trong th mc webapps (C:\Webservice\jakarta-tomcat-4.0.6\webapps)

Copy tp tin xerces.jar (C:\Webservice\jakarta-tomcat-4.0.6\common\lib\xerces.jar) vo trong th mc lib(C:\Webservice\jakarta-tomcat-4.0.6\webapps\axis\WEB-INF\lib)


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Lp bean: entity.Userpackage entity;

publicclass User {private String username;private String password;

public User(){}

public User(String username, String password){this.username = username;

this.password = password;}

public String getUsername() {returnusername;

}

publicvoid setUsername(String username) {

this.username = username;}

public String getPassword() {returnpassword;

}

publicvoid setPassword(String password) {

this.password = password;}


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Lp DAO: dao.UserDAO (1)package dao;

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;

publicclass UserDAO {

Connection conn = null;

public UserDAO(String dbUsername, String dbPassword) {String dbUrl = "jdbc:mysql://your.database.domain/yourDBname" ;String dbClass = "com.mysql.jdbc.Driver";

try {Class.forName(dbClass);

conn = DriverManager.getConnection (dbUrl, dbUsername, dbPassword);

}catch(ClassNotFoundException e) {e.printStackTrace();

}catch(SQLException e) {e.printStackTrace();

}}


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Lp DAO: dao.UserDAO (2)

publicboolean checkLogin(entity.User user){String query = "Select * FROM users WHERE username = ? AND password = ?";

try {PreparedStatement ps = conn.prepareStatement(query);ps.setString(1, user.getUsername());ps.setString(2, user.getPassword());

ResultSet rs = ps.executeQuery();

if (rs.next()) { returntrue;

}}catch(SQLException e) {

e.printStackTrace();}returnfalse;

}}


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Cu hnh vo server Tomcat

Bc 1: To mt th mc test trong th mc:tomcat/webapps

Bc 2: copy cc th mc entity v dao ( bin dch cc filejava thnh .class) vo th mc:Tomcat\webapps\test\WEB-INF\classes

Bc 3: copy th vin jdbc driver (file down t mng trong cc bitrc) vo th mc: Tomcat\common\lib

Bc 4: vo th mc: Tomcat\webapps\test to ra 3 file jsp nh

sau: Home.jsp, doLogin.jsp, UserHome.jsp


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Cch 1: dng parameter


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Trang Home.jsp (1)

JSP demo test

Username:

Password:

alert ("Password ban nhap khong dung. Nhap lai!");


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Trang Home.jsp (2)


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Trang doLogin.jsp


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Trang UserHome.jsp (1)

JSP demo test

Welcome !


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Cch 2: dng bean(Khc bit trong doLogin.jsp)


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Trang Home.jsp (1)

JSP demo test

Username:

Password:

alert ("Password ban nhap khong dung. Nhap lai!");


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Trang Home.jsp (2)


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Trang doLogin.jsp


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JSP demo test

Welcome !


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JSP v Web service


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V d: web service tnh tng

entity.Calculatorcontrol.

CalculatorCtr

add.jsp doAdd.jsp

Axis web service


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Lp bean: entity.Calculatorpackage entity;

publicclass Calculator {privatedoublefirstnumber;privatedoublesecondnumber;private String result;

public Calculator(){

}

public Calculator(double a, double b){firstnumber = a;secondnumber = b;

}

// cc phng thc get/set cc thuc tnh

//.................

}

L t l


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Lp control:control.CalculatorCtr

package control;

import org.apache.axis.client.Service;import org.apache.axis.client.Call;import org.apache.axis.encoding.XMLType;import javax.xml.rpc.ParameterMode;

publicclass CalculatorCtr {public CalculatorCtr(){}

public entity.Calculator calculate(String methodName, entity.Calculator cal){String endpointURL="http://localhost:8080/axis/Calculator.jws";Service service=new Service();

try{Call call=(Call)service.createCall();call.setTargetEndpointAddress(new java.net.URL(endpointURL));call.setOperationName(methodName);call.addParameter("a", XMLType.XSD_DOUBLE, ParameterMode.PARAM_MODE_IN);call.addParameter("b", XMLType.XSD_DOUBLE, ParameterMode.PARAM_MODE_IN);call.setReturnType(XMLType.XSD_STRING);String result=(String)call.invoke(

new Object[]{cal.getFirstnumber(),cal.getSecondnumber()});cal.setResult(result);

}catch(Exception ex){System.out.println("Loi: "+ex);

} return cal;

}}


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Cu hnh vo server Tomcat

Bc 1: To mt th mc test trong th mc:tomcat/webapps

Bc 2: copy cc th mc entity,control v dao ( bin dchcc file java thnh .class) vo th mc:Tomcat\webapps\test\WEB-INF\classes

Bc 3: copy cc file .jar trong th mc lib ca axis (file down tmng trong cc bi trc) vo th mc: Tomcat\common\lib

Bc 4: vo th mc: Tomcat\webapps\test to ra 2 file jsp nh

sau: add.jsp, doAdd.jsp


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Trang add.jsp (1)

JSP demo test

First number:

Second number:


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Trang Home.jsp (2)


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Trang doAdd.jsp (1)

JSP demo test

The sum of and is:


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Trang doAdd.jsp (2)


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Bi tp

Ci t theo m hnh web service cho bi

ton tm USCLN Ci t theo m hnh web service cho bi

ton gii phng trnh bc hai


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Struts framework


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Kin trc Struts

[image source:http://j2ee.masslight.com/]


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Login dng Struts


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Cc lp java


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entity.Userpackage entity;

import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionMessage;

publicclass User extends org.apache.struts.action.ActionForm {private String username;

private String password;

/** cc hm khi to + phng thc get/set */

public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {

ActionErrors errors = new ActionErrors(); if (username == null || username.length() < 1) {

errors.add("userName", new ActionMessage("error.username.required"));}

if (password == null || password.length() < 1) {errors.add("password", new ActionMessage("error.password.required"));

} return errors;

}}


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Lp DAO: dao.UserDAO (1)package dao;

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;

publicclass UserDAO {Connection conn = null;

public UserDAO() {String dbUsername = "sa", dbPassword = "sa";String dbUrl = "jdbc:mysql://your.database.domain/yourDBname" ;String dbClass = "com.mysql.jdbc.Driver";

try {Class.forName(dbClass);

conn = DriverManager.getConnection (dbUrl, dbUsername, dbPassword);

}catch(ClassNotFoundException e) {e.printStackTrace();

}catch(SQLException e) {e.printStackTrace();

}}


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Lp DAO: dao.UserDAO (2)

publicboolean checkLogin(entity.User user){String query = "Select * FROM users WHERE username = ? AND password = ?";

try {PreparedStatement ps = conn.prepareStatement(query);ps.setString(1, user.getUsername());ps.setString(2, user.getPassword());

ResultSet rs = ps.executeQuery();

if (rs.next()) { returntrue;

}}catch(SQLException e) {

e.printStackTrace();

}returnfalse;

}}


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control.LoginAction

package control;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionForward;

publicclass LoginAction extends org.apache.struts.action.Action {

/* forward name="success" path="" */ privatefinalstatic String SUCCESS = "success"; privatefinalstatic String FAILURE = "failure";

public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)

throws Exception {entity.User loginForm = (entity.User) form;dao.UserDAO userDAO = new dao.UserDAO();

if (userDAO.checkLogin(loginForm)) { return mapping.findForward(SUCCESS);

} else { return mapping.findForward(FAILURE);

}}

}


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Cc trang jsp


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login.jsp (1)

JSP Page

User Name :
Password :


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login.jsp (2)


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Trang success.jsp (1)

JSP Page

Login Success. Welcome


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Trang success.jsp (2)


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Trang failure.jsp (1)

JSP Page

Invalid user name or password!


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Trang failure.jsp (2)


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Cc file config


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web.xml (1)- - actionorg.apache.struts.action.ActionServlet- config/WEB-INF/struts-config.xml- debug2- detail

22- action*.do
http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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web.xml (2)- 30

- login.jsp- - /WEB-INF/struts-bean.tld/WEB-INF/struts-bean.tld

- /WEB-INF/struts-html.tld/WEB-INF/struts-html.tld- /WEB-INF/struts-logic.tld/WEB-INF/struts-logic.tld

- /WEB-INF/struts-nested.tld/WEB-INF/struts-nested.tld- /WEB-INF/struts-tiles.tld/WEB-INF/struts-tiles.tld
http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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struts-config.xml (1)

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http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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File .properties

.......

error.username.required = User Name is required.

error.password.required = Password is required.


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Web service dng Struts


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entity.Calculatorpackage entity;import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionMessage;publicclass Calculator extends org.apache.struts.action.ActionForm{

private String firstnumber, secondnumber, result;

public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {ActionErrors errors = new ActionErrors();

if (firstnumber == null || firstnumber.length() < 1) {errors.add("firstnumber", new ActionMessage("error.firstnumber.required"));}else {

try{ Double.parseDouble(firstnumber);}catch(Exception e){

errors.add("firstnumber", new ActionMessage("error.firstnumber.double"));}

} if (secondnumber == null || secondnumber.length() < 1) {

errors.add("secondnumber", new ActionMessage("error.secondnumber.required"));}else {

try{ Double.parseDouble(secondnumber);}catch(Exception e){

errors.add("secondnumber", new ActionMessage("error.secondnumber.double"));}

} return errors;

}


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control.CalculatorCtr (1)

package control;

import org.apache.axis.client.Service;import org.apache.axis.client.Call;import org.apache.axis.encoding.XMLType;import javax.xml.rpc.ParameterMode;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionForward;

publicclass CalculatorCtr extends org.apache.struts.action.Action{privatefinalstatic String RESULT = "result";

public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)

throws Exception {entity.Calculator calculator = (entity.Calculator) form;form = calculate("Add", calculator);

return mapping.findForward(RESULT);}

}


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control.CalculatorCtr (2)

public entity.Calculator calculate(String methodName, entity.Calculator cal){String endpointURL="http://localhost:8080/axis/Calculator.jws" ;Service service=new Service();

try{Call call=(Call)service.createCall();call.setTargetEndpointAddress(new java.net.URL(endpointURL));

call.setOperationName(methodName);call.addParameter("a", XMLType.XSD_DOUBLE, ParameterMode.PARAM_MODE_IN);call.addParameter("b", XMLType.XSD_DOUBLE, ParameterMode.PARAM_MODE_IN);call.setReturnType(XMLType.XSD_STRING);String result=(String)call.invoke(new

Object[]{Double.parseDouble(cal.getFirstnumber()),Double.parseDouble(cal.getSecondnumber())});

cal.setResult(result);

}catch(Exception ex){System.out.println("Loi: "+ex);}

return cal;}

}


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add.jsp (1)

Web service: Add

First number :
Second number :


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add.jsp (2)


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result.jsp (1)

Web service: Add result

The sum of and is


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result.jsp (2)


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web.xml (1)- - actionorg.apache.struts.action.ActionServlet- config

/WEB-INF/struts-config.xml- debug2- detail

22- action*.do
http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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web.xml (2)- 30

- add.jsp- - /WEB-INF/struts-bean.tld/WEB-INF/struts-bean.tld

- /WEB-INF/struts-html.tld/WEB-INF/struts-html.tld- /WEB-INF/struts-logic.tld/WEB-INF/struts-logic.tld

- /WEB-INF/struts-nested.tld/WEB-INF/struts-nested.tld- /WEB-INF/struts-tiles.tld/WEB-INF/struts-tiles.tld
http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22http://c/Works/PTIT/Teaching/Lap%20trinh%20mang/Slide/l%20%22


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File .properties

.......

error.firstnumber.required = First number is required.

error.secondnumber.required = Second number is required.

error.firstnumber.double = First number must be in a double format.

error.secondnumber.double = Second number must be in a double format.

Bi t


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Bi tp

Ci t theo struts famework v dng webservice cho cc bi ton:

Tm USCLN ca hai s nguyn dng a v b

Gii phng trnh bc hai


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Questions?

b13 ltm láºp trÃ¬nh nÃ¢ng cao jsp-java-tomcat-ws vá»›i pattern j2ee

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