BlogJava-andyny JAVA课堂-随笔分类-struts

2008-3-18 实践3:MyEclipse整合Struts与Hibernate 登陆模块.........

andyny — Tue, 18 Mar 2008 14:52:00 GMT

++++++++++++++++student.sql++++++++++++

drop database if exists schoolproject;

create database schoolproject;

use schoolproject;

-- Table structure for table 'student'

drop table if exists student;

CREATE TABLE student (

id varchar(100) NOT NULL default '',

name varchar(20) default '',

`cardId` varchar(20) NOT NULL default '',

age int(11) default '0',

PRIMARY KEY (id)

) ENGINE = InnoDB

CHARACTER SET utf8 COLLATE utf8_general_ci;

+++++++++++++++++++++++++student.cfg.xml+++++++++++++

PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

select-before-update="true">

+++++++++++++++++hibernate.cfg.xml+++++++++++++++++

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

root

jdbc:mysql://localhost:3306/schoolproject

org.hibernate.dialect.MySQLDialect

mysql

1002

com.mysql.jdbc.Driver

true

+++++++++++++++++++Student.java PO+++++++++++++

package model;

public class Student {

private String id; //标识id

private String cardId; //学号

private String name; //学生姓名

private int age; //岁数

public int getAge() {

return age;

}

public String getName() {

return name;

}

public String getCardId() {

return cardId;

}

public void setId(String id) {

this.id = id;

}

public void setAge(int age) {

this.age = age;

}

public void setName(String stuName) {

this.name = stuName;

}

public void setCardId(String cardId) {

this.cardId = cardId;

}

public String getId() {

return id;

}

public Student() { //无参的构造函数

}

* 创建日期 2005-3-26

* TODO 要更改此生成的文件的模板，请转至

* 窗口－首选项－ Java －代码样式－代码模板

++++++++++++++++++ StudentForm.java VO+++++++++++

package model;

import org.apache.struts.action.ActionForm;

/**

* @author Administrator

* TODO 要更改此生成的类型注释的模板，请转至

* 窗口－首选项－ Java －代码样式－代码模板

public class StudentForm extends ActionForm {

private String id;

private String cardId;

private String name;

private int age;

/**

* @return 返回 age。

public int getAge() {

return age;

}

/**

* @param age 要设置的 age。

public void setAge(int age) {

this.age = age;

}

/**

* @return 返回 cardId。

public String getCardId() {

return cardId;

}

/**

* @param cardId 要设置的 cardId。

public void setCardId(String cardId) {

this.cardId = cardId;

}

/**

* @return 返回 id。

public String getId() {

return id;

}

/**

* @param id 要设置的 id。

public void setId(String id) {

this.id = id;

}

/**

* @return 返回 name。

public String getName() {

return name;

}

/**

* @param name 要设置的 name。

public void setName(String name) {

this.name = name;

}

* 创建日期 2005-3-26

* TODO 要更改此生成的文件的模板，请转至

* 窗口－首选项－ Java －代码样式－代码模板

++++++++++++StuAction.java Action+++++++++++

package action;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import model.Student;

import model.StudentForm;

import org.apache.commons.beanutils.BeanUtils;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import persistence.StudentDAO;

/**

* @author Administrator

* TODO 要更改此生成的类型注释的模板，请转至窗口－首选项－ Java －代码样式－代码模板

public class StuAction extends DispatchAction {

//添加学生记录

public ActionForward insert(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

StudentForm stu_vo=(StudentForm)form;

Student stu_po=new Student();

BeanUtils.copyProperties(stu_po, stu_vo);

StudentDAO.createObj(stu_po);

List list = StudentDAO.getAllStu();

request.setAttribute("list", list);

return list(mapping, form, request, response);

}

//删除学生记录

public ActionForward del(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

StudentForm stuForm = (StudentForm) form;

//注意，stu_list传递过来只有参数id，且与StudentForm 的id对应，于是只初始化stuForm 实例的id属性。故：stuForm.getId()不为空，其他的为空。
System.out.println("++++++AGE++++++++"+stuForm.getAge());//0

System.out.println("+++++++CARDID+++++++"+stuForm.getCardId());//null

System.out.println("++++++++++ID++++"+stuForm.getId() );//null

StudentDAO.delObject(stuForm.getId());

return list(mapping, form, request, response);

}

//取得要修改的学生资料，并把页面导向detail.sjp

public ActionForward getMdfInfo(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

StudentForm stu_vo = (StudentForm) form;

Student stu_po = StudentDAO.findById(stu_vo.getId());

BeanUtils.copyProperties(stu_vo, stu_po);

request.setAttribute("stuForm", stu_vo);

return mapping.findForward("detail");

}

//修改学生记录

public ActionForward update(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

StudentForm stu_vo = (StudentForm) form;

Student stu_po = new Student();

BeanUtils.copyProperties(stu_po, stu_vo);

StudentDAO.mdfObj(stu_po);

return list(mapping, form, request, response);

}

//取得学生列表，并发送到stu_list.jsp

public ActionForward list(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

List list = StudentDAO.getAllStu();

List temp = new ArrayList(list.size());

for (int i = 0; i < list.size(); i++) {

Student stu_po = (Student) list.get(i);

StudentForm stu_vo = new StudentForm();

BeanUtils.copyProperties(stu_vo, stu_po);

temp.add(stu_vo);

}

request.setAttribute("list", temp);

return mapping.findForward("stu_list");

}

* 创建日期 2005-7-2

* TODO 要更改此生成的文件的模板，请转至

* 窗口－首选项－ Java －代码样式－代码模板

+++++++++++++++++++StudentDAO.java DAO +++++++++++

package persistence;

import java.util.List;

import model.Student;

import org.apache.log4j.Logger;

import org.hibernate.HibernateException;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.Transaction;

/**

* @author Administrator

* TODO 要更改此生成的类型注释的模板，请转至窗口－首选项－ Java －代码样式－代码模板

public class StudentDAO extends BaseDAO {

static Session session = null;

static Transaction tx = null;

static Logger logger = Logger.getLogger(StudentDAO.class);

public static Student findById(String id) {

Student stu = null;

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

stu = (Student) session.get(Student.class, id);

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

} finally {

HibernateUtil.closeSession(session);

}

return stu;

}

public static List findByName(String name) {

List list = null;

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

Query q=session.createQuery("from Student s where s.name=:name");

q.setString(1,name);

list = q.list();

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

} finally {

HibernateUtil.closeSession(session);

}

return list;

}

public static List getAllStu()

{

List list = null;

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

list = session.createQuery("from Student")

.list();

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

} finally {

HibernateUtil.closeSession(session);

}

return list;

}

public static void main(String ars[]) {

Student newStu=new Student();

newStu.setName("tomclus");

newStu.setCardId("12345");

newStu.setAge(26);

StudentDAO.createObj(newStu);

}

+++++++++++++++++++++HibernateUtil.java++++++++++++++++

package persistence;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class HibernateUtil {

private static final SessionFactory sessionFactory;

private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";

static {

try {

sessionFactory = new Configuration().configure(CONFIG_FILE_LOCATION)

.buildSessionFactory();

} catch (HibernateException ex) {

throw new RuntimeException("Exception building SessionFactory: "

+ ex.getMessage(), ex);

}

public static Session currentSession() {

Session s = sessionFactory.openSession();

return s;

}

public static void closeSession(Session s){

s.close();

}

* 创建日期 2005-7-2

* TODO 要更改此生成的文件的模板，请转至

* 窗口－首选项－ Java －代码样式－代码模板

+++++++++++++++++++++++++++BaseDAO.java DAO++++++++++++

package persistence;

import model.Student;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.Transaction;

public class BaseDAO {

static Session session=null;

static Transaction tx=null;

/*------------创建新对象-----------------*/

public static void createObj(Object o) {

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

session.save(o);

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

}finally

{

if(session!=null)

HibernateUtil.closeSession(session);

}

/*------------删除对象-----------------*/

public static void delObject(String id) {

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

Object o=session.get(Student.class,id);

session.delete(o);

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

}finally

{HibernateUtil.closeSession(session);}

}

/*------------修改对象-----------------*/

public static void mdfObj(Object o) {

try {

session = HibernateUtil.currentSession(); //开启连接

tx = session.beginTransaction(); //开启事务

session.update(o);

tx.commit();

} catch (HibernateException e) { //捕捉例外

e.printStackTrace();

tx.rollback();

}finally

{HibernateUtil.closeSession(session);}

}

++++++++++struts-config.xml+++++++++++++=

"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"

"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

path="/StuAction"

name="stuForm"

type="action.StuAction"

scope="request"

input="/detail.jsp"

parameter="method"

+++++++++++++++web.xml++++++++++++++++++

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"

"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

action

org.apache.struts.action.ActionServlet

config

/WEB-INF/struts-config.xml

action

*.do

detail.jsp

/tags/struts-html

/WEB-INF/struts-html.tld

/tags/struts-bean

/WEB-INF/struts-bean.tld

++++++++++++++++detail.jsp index+++++++++++==

<%@ page

language="java"

contentType="text/html; charset=gb2312"

import="model.StudentForm"

<%@ taglib uri="/tags/struts-html" prefix="html" %>

String method=request.getParameter("method");

// method=getMdfInfo,insert,null(首页)。

if(method!=null){

if(method.equals("getMdfInfo"))

{

StudentForm stuForm=(StudentForm)request.getAttribute("stuForm");

<%}

// method=insert;

else if(method.equals("insert")){

;// 注意添加的页面，就是主页显示的内容，所以不用设计表单了。

<%}

} // end if method!=null;

// 下面是默认的表单哦 %>

++++++++++++++++++++++++stu_list.jsp+++++++++++++++

<%@ page

language="java"

import="java.util.*"

import="model.StudentForm"

contentType="text/html; charset=gb2312"

List list=(List)request.getAttribute("list");

for(int i=0;i

{

StudentForm stu=(StudentForm)list.get(i);

<%}%>

学号

姓名

年龄

操作

<%=stu.getCardId()%>

<%=stu.getName()%>

<%=stu.getAge()%>

?id=<%=stu.getId()%>&method=del">删除

修改

添加

andyny 2008-03-18 22:52 发表评论

2008-3-15 实践2 -Struts 留言板...............

andyny — Sat, 15 Mar 2008 14:14:00 GMT

本程序出自《Eclipse WEB开发从入门到精通》
之 Struts在线留言板

++++++++++++++++++++++++++++++++Note.java+++++++++++++++

package note.util;

import java.io.Serializable;

public class Note implements Serializable {
private String content;
private String author;
public Note() {
  super();
  // TODO Auto-generated constructor stub
}
public Note(String content, String author) {
  super();
  this.content = content;
  this.author = author;
}
/**
* @return the content
*/
public String getContent() {
  return content;
}
/**
* @param content the content to set
*/
public void setContent(String content) {
  this.content = content;
}
/**
* @return the author
*/
public String getAuthor() {
  return author;
}
/**
* @param author the author to set
*/
public void setAuthor(String author) {
  this.author = author;
}
}

+++++++++++++++++++++++++ NoteUtil.java+++++++++++++++++++

package note.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class NoteUtil implements Serializable {// 实现序列化哦，还有Note.java类

// 从notes.xml文件中获取 Note对象，组装成Note[]数组返回。
public static Note[] getNotes() {
  List list = new ArrayList();
  Note note = null;
  Note[] noteList=null;
  BufferedReader reader = null;
  try {
   reader = new BufferedReader(new FileReader(new File("notes.xml")));
   String aNote = reader.readLine();
   aNote.trim(); // 需要删除留言信息中首尾多余的空白。
   while (aNote != null) {
    System.out.println("1111111111111111");
    note = new Note();
    System.out.println("2222222222222222");
    int equalIndex = aNote.indexOf('=');
    note.setAuthor(aNote.substring(0, equalIndex));
    note.setContent(aNote.substring(equalIndex+1));
    list.add(note);
    aNote=reader.readLine();
   }

  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    reader.close();
   } catch (IOException e) {
    e.printStackTrace();
   }

  }
  noteList = new Note[list.size()];
  for (int i = 0; i < list.size(); i++) {
   noteList[i] = (Note) list.get(i);
  }

return noteList;
}

// 保存一个Note对象到notes.xml文件。
public static void saveNote(Note note) {
  String author = null;
  String content = null;
  author = note.getAuthor();
  content = note.getContent();
  BufferedWriter writer = null;
  try {
   File file = new File("notes.xml");
   // 注意:此时 notes.xml文件的位置是Tomcat/bin目录下！
   System.out.println("++++++++++"+file.getAbsolutePath()+"+++++++++++");
   file.createNewFile();// 若果文件notes.xml不存在，那么创建一个新的空文件,此语句可有可无！！！。
   writer = new BufferedWriter(new FileWriter(file, true));
   writer.write(author + "=" + content);
   writer.newLine();
   // 注意:在读写文件时，一定要清理缓存.
   writer.flush();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    writer.close();// 注意:writer变量要声明在try语句上面，finally语句才能够访问到writer变量，且关闭writer对象时需要抛出异常
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}

}

++++++++++++++++++++++++LeaveNoteForm.java+++++++++++++++

package note.form;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class LeaveNoteForm extends ActionForm {
private String content;
private String author;

/**
* @return the content
*/
public String getContent() {
return content;
}

/**
* @param content the content to set
*/
public void setContent(String content) {
this.content = content;
}

/**
* @return the author
*/
public String getAuthor() {
return author;
}

/**
* @param author the author to set
*/
public void setAuthor(String author) {
this.author = author;
}

@Override
public void reset(ActionMapping mapping, HttpServletRequest request) {
// TODO Auto-generated method stub
super.reset(mapping, request);
}

@Override
public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  ActionErrors errors=new ActionErrors();
  if(this.author.trim().length()<1){
   errors.add("authorrequired", new ActionMessage("author.required"));
  }
  if(this.content.trim().length()<1){
   errors.add("contentrequired", new ActionMessage("content.required"));
  }
  // TODO Auto-generated method stub
  return errors;
}

}

++++++++++++++++++++++++++LeaveNoteAction.java+++++++++++++++

package note.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import note.form.LeaveNoteValidatorForm;
import note.util.Note;
import note.util.NoteUtil;

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

/**
* @author Administrator
*
*/
public class LeaveNoteAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  LeaveNoteValidatorForm leaveNoteForm=(LeaveNoteValidatorForm)form;
  Note note=new Note();
  note.setAuthor(leaveNoteForm.getAuthor());
  note.setContent(leaveNoteForm.getContent());
  NoteUtil.saveNote(note);
  // 注意:是HttpSession不是Session.
  HttpSession session=request.getSession();
  // 将留言信息的列表对象保存到session对象，而没有保存到request对象,为什么呢？方便leavenote.jsp直接点击链接查看留言(如果保存到request对象里，则noteslist对象为空，取不到留言信息！)。
  session.setAttribute("noteslist", NoteUtil.getNotes());

  return mapping.findForward("notelist");
}

}

++++++++++++++++++ LeaveNoteValidatorForm.java+++++++++++++++++++

package note.form;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.validator.ValidatorForm;

public class LeaveNoteValidatorForm extends ValidatorForm {
private String content;
private String author;
/**
* @return the content
*/
public String getContent() {
  return content;
}
/**
* @param content the content to set
*/
public void setContent(String content) {
  this.content = content;
}
/**
* @return the author
*/
public String getAuthor() {
  return author;
}
/**
* @param author the author to set
*/
public void setAuthor(String author) {
  this.author = author;
}

public void reset(ActionMapping mapping, HttpServletRequest request) {
// TODO Auto-generated method stub
super.reset(mapping, request);
}

public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  // TODO Auto-generated method stub
  return super.validate(mapping, request);
}
}

+++++++++++++++++leavenote.jsp++++++++++++++++++++

<%@ page contentType="text/html; charset=GB2312" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

leave messages

+++++++++++++++++++++++++++noteslist.jsp+++++++++++++++++++++++

<%@ page language="java" contentType="text/html; charset=GB2312"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>

read all notes

+++++++++++++++++++++struts-config.xml++++++++++++++++++++

+++++++++++++++++++++++Validator.xml+++++++++++++++++++++++++++

"-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">

+++++++++++++++++++++++++资源文件++++++++++++++++++++

note.welcome=欢迎你的留言！
note.readAllNotes=以下是全部的留言信息！
note.content=留言内容
note.author=作者
read.notes=查看所有留言信息
author.required=请输入留言人姓名!
content.required=请输入留言内容!
button.leavenote.submit=提交
button.leavenote.reset=重置
link.goback.leavenote=返回留言
errors.required={0}是必须要填写的！
errors.author.mask=用户名输入规则不正确a-zA-Z！

注意：请用Native2ASCII -encoding gb2312 b.txt b.properties转为Unicode码
否则会显示乱码
相反，可以用命令
native2ascii -reverse -encoding gb2312 test_ascii.properties > test_native2.properties
还原为中文编码显示的资源文件

andyny 2008-03-15 22:14 发表评论

2008-3-12 实践1-Struts入门程序:猜数字............

andyny — Thu, 13 Mar 2008 12:40:00 GMT

+++++++++++++++++++++++++++++++++++++++++++++

package org.andyny.struts.guessnumber;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

public class CreateNumberForm extends ActionForm {

private String secretnumber;

public String getSecretnumber() {

return secretnumber;

}

public void setSecretnumber(String secretnumber) {

this.secretnumber = secretnumber;

}

public ActionErrors validate(ActionMapping actionMapping,HttpServletRequest request){

return null;

}

public void reset(ActionMapping actionMapping ,HttpServletRequest request){

}

+++++++++++++++++++++++++++++++++++++++++++++++

package org.andyny.struts.guessnumber;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

public class CreateNumberAction extends Action {

public ActionForward execute(ActionMapping actionMapping,

ActionForm actionForm, HttpServletRequest request,

HttpServletResponse response) {

CreateNumberForm createform = (CreateNumberForm) actionForm;

int number = Integer.parseInt(createform.getSecretnumber());

System.out.println("+++++++++++++范围:"+number);

// 注意:此为(int)(Math.random()*number)，而不是 (imt)Math.random()*number 否则secretnumber永远为0！

int secretNumber = (int)(Math.random()*number);

System.out.println("+++++++++++++生成码:"+secretNumber);

HttpSession session = request.getSession();

// 注意:此句作用是在点击 "开始新的猜测"的时候把session的属性删除，否则会显示上次猜测时显示的消息(虽然你这次还没有猜测)！ session.removeAttribute("message");

session.setAttribute("secretNumber", String.valueOf(secretNumber));

return actionMapping.findForward("createforward");

}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package org.andyny.struts.guessnumber;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

/**

* @author Administrator

public class GuessNumberForm extends ActionForm {

private String guessnumber;

public String getGuessnumber() {

return guessnumber;

}

public void setGuessnumber(String guessnumber) {

this.guessnumber = guessnumber;

}

public ActionErrors validate(ActionMapping actionMapping,HttpServletRequest request){

return null;

}

public void reset(ActionMapping actionMapping ,HttpServletRequest request){

}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

/**

package org.andyny.struts.guessnumber;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

/**

* @author Administrator

public class GuessNumberAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

GuessNumberForm guessform = (GuessNumberForm) form;

int guessNumber = Integer.parseInt(guessform.getGuessnumber());

HttpSession session = request.getSession();

// session.getAttribute() return a Object Type ;此Object类型即是 session.setAttribute("name","Value")决定的类型，在此是String类型 System.out.println("+++++++++++++++++"+ session.getAttribute("secretNumber"));

int secretNumber =Integer.parseInt((String)session.getAttribute("secretNumber"));

if (guessNumber == secretNumber) {

session.setAttribute("message", "equal");

} else if (guessNumber > secretNumber) {

session.setAttribute("message", "bigger");

} else {

session.setAttribute("message", "smaller");

}

return mapping.findForward("guessforward");

}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

action

org.apache.struts.action.ActionServlet

config

/WEB-INF/struts-config.xml

debug

detail

action

*.do

index.jsp

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

<%@ page contentType="text/html; charset=GB2312"%>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>

请选择你要猜测数的范围:

100

1000

开始一次新的猜测

请输入你要猜测的数字:

猜测

<% String msg=null;

msg = (String) session.getAttribute("message");

// 注意:msg!=null时为条件，否则会抛出NullPointer异常
if (msg != null) {

if (msg.equals("equal")) {

out.println("恭喜你，猜对了！");

} else if (msg.equals("bigger")) {

out.println("大了，再猜！");

} else {

out.println("小了，再猜！");

}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

<%@ page contentType="text/html; charset=GB2312"%>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>

100

1000

String msg = null;

msg = (String) session.getAttribute("message");

// 注意:msg!=null时为条件

if (msg != null) {

if (msg.equals("equal")) {