userejb.java

《J2EE企业级应用开发》一书的配套源代码

package com.j2eeapp.cdstore.signon;

import java.rmi.RemoteException;
import javax.ejb.*;

/**
 * 在系统里另外存在一个表，专门存放用户名和password。
 */
public abstract class UserEJB implements EntityBean
{
    /**
     * Attributes declaration
    */
    public EntityContext EJB_Context;
    
    /**
     * @J2EE_METHOD  --  UserEJB
     */
    public UserEJB    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbCreate
     * Matching method of the create() method of the bean's home interface. The container
     * invokes an ejbCreate method to create an entity object. It executes in the transaction
     * context determined by the transaction attribute of the matching create() method.
     * @throws javax.ejb.CreateException
     */
    public String ejbCreate    (String userName, String password) throws CreateException 
    { 
	
        
        // check the input data
        if(userName.length() > UserLocal.MAX_USERID_LENGTH) {
            throw new CreateException("User ID cant be more than " +
            UserLocal.MAX_USERID_LENGTH + " chars long");
        }
        if(password.length() > UserLocal.MAX_PASSWD_LENGTH) {
            throw new CreateException("Password cant be more than " +
            UserLocal.MAX_PASSWD_LENGTH + " chars long");
        }
        if( (userName.indexOf('%') != -1) ||
        (userName.indexOf('*') != -1) ) {
            throw new CreateException("User Id cannot " +
            "have '%' or '*' characters");
        }
        
        setUserName(userName);
        setPassword(password);
        return null;

    }
    
    /**
     * @J2EE_METHOD  --  ejbPostCreate
     * Matching method of ejbCreate. The container invokes the matching ejbPostCreate method
     * on an instance after it invokes the ejbCreate method with the same arguments. It
     * executes in the same transaction context as that of the matching ejbCreate method.
     * @throws javax.ejb.CreateException
     */
    public void ejbPostCreate    (String userName, String password) throws CreateException 
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbActivate
     * A container invokes this method when the instance is taken out of the pool of available
     * instances to become associated with a specific EJB object. This method transitions
     * the instance to the ready state. This method executes in an unspecified transaction
     * context.
     */
    public void ejbActivate    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbPassivate
     * A container invokes this method on an instance before the instance becomes disassociated
     * with a specific EJB object. After this method completes, the container will place
     * the instance into the pool of available instances. This method executes in an unspecified
     * transaction context.
     */
    public void ejbPassivate    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbLoad
     * A container invokes this method to instruct the instance to synchronize its state
     * by loading it from the underlying database. This method always executes in the transaction
     * context determined by the value of the transaction attribute in the deployment descriptor.
     */
    public void ejbLoad    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbStore
     * A container invokes this method to instruct the instance to synchronize its state
     * by storing it to the underlying database. This method always executes in the transaction
     * context determined by the value of the transaction attribute in the deployment descriptor.
     */
    public void ejbStore    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbRemove
     * A container invokes this method before it removes the EJB object that is currently
     * associated with the instance. It is invoked when a client invokes a remove operation
     * on the enterprise Bean's home or remote interface. It transitions the instance from
     * the ready state to the pool of available instances. It is called in the transaction
     * context of the remove operation.
     * @throws javax.ejb.RemoveException
     */
    public void ejbRemove    () throws RemoveException 
    { 

    }
    
    /**
     * @J2EE_METHOD  --  setEntityContext
     * Set the associated entity context. The container invokes this method on an instance
     * after the instance has been created. This method is called in an unspecified transaction
     * context. 
     */
    public void setEntityContext    (EntityContext ctx)  
    { 
    	EJB_Context=ctx;
    }
    
    /**
     * @J2EE_METHOD  --  unsetEntityContext
     * Unset the associated entity context. The container calls this method before removing
     * the instance. This is the last method that the container invokes on the instance.
     * The Java garbage collector will  invoke the finalize() method on the instance. It
     * is called in an unspecified transaction context.
     */
    public void unsetEntityContext    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  getUserName
     */
    public abstract String getUserName    (); 
    
    /**
     * @J2EE_METHOD  --  setUserName
     */
    public abstract void setUserName    (String newUserName); 
    
    /**
     * @J2EE_METHOD  --  getPassword
     */
    public abstract String getPassword    (); 
    
    /**
     * @J2EE_METHOD  --  setPassword
     */
    public abstract void setPassword    (String newPassword); 
    
    /**
     * @J2EE_METHOD  --  matchPassword:boolean
     */
    public boolean matchPassword   (String password)  
    { 
     return password.equals(getPassword());


    }
}