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　[J2EE]實(shí)戰(zhàn)留言本(升級(jí)應(yīng)用篇)

作者：maxuan　時(shí)間： 2003-10-04　文檔類型：原創(chuàng)　來(lái)自：藍(lán)色理想

創(chuàng)建實(shí)體Bean
和上篇實(shí)戰(zhàn)EJB一樣，我們?cè)贘builder中先建立一個(gè)guestbook.jpx項(xiàng)目，然后再利用向?qū)ЫJB名為book，接著我們需要建立它的數(shù)據(jù)源，也命名為book，當(dāng)然你想取什么名字都行，不過(guò)以后在weblogic中的數(shù)據(jù)源配置要和這里寫(xiě)的一樣，由于這些配置和上一篇相同，所以這里我都省去了，請(qǐng)大家仔細(xì)看上篇的貼子，有問(wèn)題請(qǐng)PM我！
首先創(chuàng)建book表的CMP實(shí)體Bean文件，由于ID是在數(shù)據(jù)庫(kù)中自動(dòng)增加，在此我們可以將它刪除，而指定name為主鍵，同時(shí)我們修改posttime的類型為java.lang.String.

接下來(lái)我們?cè)O(shè)計(jì)模型，這里放在value中，下面是BookValue.java的源代碼

package guestbook.maxuan.ejb.entity.value;

import java.io.*;

public class BookValue implements Serializable{
public java.lang.String name;
public java.lang.String email;
public java.lang.String qq;
public java.lang.String posttime;
public java.lang.String comment;
public java.lang.String ip;
public java.lang.String action;
private void writeObject(ObjectOutputStream oos)

throws IOException {
    oos.defaultWriteObject();
  }
  private void readObject(ObjectInputStream ois)

throws ClassNotFoundException, 

IOException {
    ois.defaultReadObject();
  }
  public String getAction() {
    return action;
  }
  public void setAction(String action) {
    this.action = action;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getEmail() {
    return email;
  }
  public void setEmail(String email) {
    this.email = email;
  }
  public String getQq() {
    return qq;
  }
  public void setQq(String qq) {
    this.qq = qq;
  }
  public java.lang.String getPosttime() {
    return posttime;
  }
  public void setPosttime(java.lang.String posttime) {
    this.posttime = posttime;
  }
  public String getIp() {
    return ip;
  }
  public void setIp(String ip) {
    this.ip = ip;
  }
  public String getComment() {
    return comment;
  }
  public void setComment(String comment) {
    this.comment = comment;
  }
}

book.java的源代碼

package guestbook.maxuan.ejb.entity;
import javax.ejb.*;
import java.util.*;
import guestbook.maxuan.ejb.entity.value.*;

public interface Book extends javax.ejb.EJBLocalObject {
public void setName(String name);
public String getName();
public void setEmail(String email);
public String getEmail();
public void setQq(String qq);
public String getQq();
public void setPosttime(String posttime);
public String getPosttime();
public void setComment(String comment);
public String getComment();
public void setIp(String ip);
public String getIp();
public BookValue getValue();
public void setValue(BookValue value);
}

BookBean.java的源代碼

package guestbook.maxuan.ejb.entity;

import javax.ejb.*;
import guestbook.maxuan.ejb.entity.value.*;

abstract public class BookBean implements EntityBean {
  EntityContext entityContext;
  public java.lang.String ejbCreate(java.lang.String name)

throws CreateException {
    setName(name);
    return null;
  }
  public java.lang.String ejbCreate(BookValue value)

throws CreateException {
    setValue(value);
    return null;
  }
  public void ejbPostCreate(java.lang.String name)

throws CreateException {
    /**@todo Complete this method*/
  }
  public void ejbPostCreate(BookValue value)

throws CreateException {
  }
  public void ejbRemove() throws RemoveException {
    /**@todo Complete this method*/
  }
  public abstract void setName(java.lang.String name);
  public abstract void setEmail(java.lang.String email);
  public abstract void setQq(java.lang.String qq);
  public abstract void setPosttime(java.lang.String posttime);
  public abstract void setComment(java.lang.String comment);
  public abstract void setIp(java.lang.String ip);
  public abstract java.lang.String getName();
  public abstract java.lang.String getEmail();
  public abstract java.lang.String getQq();
  public abstract java.lang.String getPosttime();
  public abstract java.lang.String getComment();
  public abstract java.lang.String getIp();
  public void ejbLoad() {
    /**@todo Complete this method*/
  }
  public void ejbStore() {
    /**@todo Complete this method*/
  }
  public void ejbActivate() {
    /**@todo Complete this method*/
  }
  public void ejbPassivate() {
    /**@todo Complete this method*/
  }
  public void unsetEntityContext() {
    this.entityContext = null;
  }
  public void setEntityContext(EntityContext entityContext) {
    this.entityContext = entityContext;
  }
  public BookValue getValue(){
    BookValue value = new BookValue();
    value.setName(getName());
    value.setEmail(getEmail());
    value.setQq(getQq());
    value.setPosttime(getPosttime());
    value.setComment(getComment());
    value.setIp(getIp());
    return value;
  }
  public void setValue(BookValue value){
    setName(value.getName());
    setEmail(value.getEmail());
    setQq(value.getQq());
    setPosttime(value.getPosttime());
    setComment(value.getComment());
    setIp(value.getIp());
  }
}

BookHome.java的源代碼

package guestbook.maxuan.ejb.entity;

import javax.ejb.*;
import java.util.*;
import guestbook.maxuan.ejb.entity.value.*;

public interface BookHome extends javax.ejb.EJBLocalHome {
  public Book create(String name) throws CreateException;
  public Book create(BookValue value) throws CreateException;
  public Collection findAll() throws FinderException;
  public Book findByPrimaryKey(String name)

throws FinderException;
}

記得要寫(xiě)findall的Query語(yǔ)句：SELECT OBJECT(o) FROM Book AS o
接下來(lái)我們?cè)O(shè)計(jì)模型，這里放在value中，下面是BookValue.java的源代碼

package guestbook.maxuan.ejb.entity.value;

import java.io.*;

public class BookValue implements Serializable{
  public java.lang.String name;
  public java.lang.String email;
  public java.lang.String qq;
  public java.lang.String posttime;
  public java.lang.String comment;
  public java.lang.String ip;
  public java.lang.String action;
  private void writeObject(ObjectOutputStream oos)

throws IOException {
    oos.defaultWriteObject();
  }
  private void readObject(ObjectInputStream ois)

 throws ClassNotFoundException, 

IOException {
    ois.defaultReadObject();
  }
  public String getAction() {
    return action;
  }
  public void setAction(String action) {
    this.action = action;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getEmail() {
    return email;
  }
  public void setEmail(String email) {
    this.email = email;
  }
  public String getQq() {
    return qq;
  }
  public void setQq(String qq) {
    this.qq = qq;
  }
  public java.lang.String getPosttime() {
    return posttime;
  }
  public void setPosttime(java.lang.String posttime) {
    this.posttime = posttime;
  }
  public String getIp() {
    return ip;
  }
  public void setIp(String ip) {
    this.ip = ip;
  }
  public String getComment() {
    return comment;
  }
  public void setComment(String comment) {
    this.comment = comment;
  }
}

</textarea>

book.java的源代碼

package guestbook.maxuan.ejb.entity;

import javax.ejb.*;
import java.util.*;
import guestbook.maxuan.ejb.entity.value.*;

public interface Book extends javax.ejb.EJBLocalObject {
  public void setName(String name);
  public String getName();
  public void setEmail(String email);
  public String getEmail();
  public void setQq(String qq);
  public String getQq();
  public void setPosttime(String posttime);
  public String getPosttime();
  public void setComment(String comment);
  public String getComment();
  public void setIp(String ip);
  public String getIp();
  public BookValue getValue();
  public void setValue(BookValue value);
}

</textarea>
BookBean.java的源代碼

package guestbook.maxuan.ejb.entity;

import javax.ejb.*;
import guestbook.maxuan.ejb.entity.value.*;

abstract public class BookBean implements EntityBean {
  EntityContext entityContext;
  public java.lang.String ejbCreate(java.lang.String name)

throws CreateException {
    setName(name);
    return null;
  }
  public java.lang.String ejbCreate(BookValue value)

throws CreateException {
    setValue(value);
    return null;
  }
  public void ejbPostCreate(java.lang.String name)

throws CreateException {
    /**@todo Complete this method*/
  }
  public void ejbPostCreate(BookValue value)

 throws CreateException {
  }
  public void ejbRemove() throws RemoveException {
    /**@todo Complete this method*/
  }
  public abstract void setName(java.lang.String name);
  public abstract void setEmail(java.lang.String email);
  public abstract void setQq(java.lang.String qq);
  public abstract void setPosttime(java.lang.String posttime);
  public abstract void setComment(java.lang.String comment);
  public abstract void setIp(java.lang.String ip);
  public abstract java.lang.String getName();
  public abstract java.lang.String getEmail();
  public abstract java.lang.String getQq();
  public abstract java.lang.String getPosttime();
  public abstract java.lang.String getComment();
  public abstract java.lang.String getIp();
  public void ejbLoad() {
    /**@todo Complete this method*/
  }
  public void ejbStore() {
    /**@todo Complete this method*/
  }
  public void ejbActivate() {
    /**@todo Complete this method*/
  }
  public void ejbPassivate() {
    /**@todo Complete this method*/
  }
  public void unsetEntityContext() {
    this.entityContext = null;
  }
  public void setEntityContext(EntityContext entityContext) {
    this.entityContext = entityContext;
  }
  public BookValue getValue(){
    BookValue value = new BookValue();
    value.setName(getName());
    value.setEmail(getEmail());
    value.setQq(getQq());
    value.setPosttime(getPosttime());
    value.setComment(getComment());
    value.setIp(getIp());
    return value;
  }
  public void setValue(BookValue value){
    setName(value.getName());
    setEmail(value.getEmail());
    setQq(value.getQq());
    setPosttime(value.getPosttime());
    setComment(value.getComment());
    setIp(value.getIp());
  }
}

</textarea>
BookHome.java的源代碼

<textarea columns=100 rows=50>
package guestbook.maxuan.ejb.entity;
import javax.ejb.*;
import java.util.*;
import guestbook.maxuan.ejb.entity.value.*;

public interface BookHome extends javax.ejb.EJBLocalHome {
  public Book create(String name) throws CreateException;
  public Book create(BookValue value) throws CreateException;
  public Collection findAll() throws FinderException;
  public Book findByPrimaryKey(String name)

throws FinderException;
}

</textarea>
記得要寫(xiě)findall的Query語(yǔ)句：SELECT OBJECT(o) FROM Book AS o

出處：藍(lán)色理想
責(zé)任編輯：藍(lán)色

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