Java 如何在JSP中调用EJB3会话bean?
我正在使用EJB和JPA在Eclipse中开发一个应用程序 我的会话bean是:Java 如何在JSP中调用EJB3会话bean?,java,jsp,ejb,javabeans,Java,Jsp,Ejb,Javabeans,我正在使用EJB和JPA在Eclipse中开发一个应用程序 我的会话bean是: package itso.bank.session; import itso.bank.entities.Account; import itso.bank.entities.Customer; import itso.bank.entities.Transaction; import itso.bank.exception.ITSOBankException; import itso.bank.serv
package itso.bank.session;
import itso.bank.entities.Account;
import itso.bank.entities.Customer;
import itso.bank.entities.Transaction;
import itso.bank.exception.ITSOBankException;
import itso.bank.service.EJBBankService;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.*;
/**
* Session Bean implementation class EJBBankBean
*/
@Stateless
public class EJBBankBean implements EJBBankService {
@PersistenceContext (unitName="RAD8JPA", type=PersistenceContextType.TRANSACTION)
private EntityManager entityMgr;
/**
* Default constructor.
*/
public EJBBankBean() {
// TODO Auto-generated constructor stub
}
public void addCustomer(Customer customer) throws ITSOBankException {
System.out.println("addCustomer: " + customer.getSsn());
entityMgr.persist(customer);
}
public void closeAccount(String ssn, String id) throws ITSOBankException {
System.out.println("closeAccount: " + id + " of customer " + ssn);
Account account = getAccount(id);
Transaction[] trans = getTransactions(id);
for (Transaction tx : trans) {
entityMgr.remove(tx);
}
entityMgr.remove(account);
System.out.println("closed account with " + trans.length + " transactions");
}
public void deleteCustomer(String ssn) throws ITSOBankException {
System.out.println("deleteCustomer: " + ssn);
Customer customer = getCustomer(ssn);
Account[] accounts = getAccounts(ssn);
for (Account acct : accounts) {
closeAccount(ssn, acct.getId());
}
entityMgr.remove(customer);
}
public void deposit(String id, BigDecimal amount) throws ITSOBankException {
System.out.println("deposit: " + id + " amount " + amount);
Account account = getAccount(id);
try {
Transaction tx = account.processTransaction(amount, Transaction.CREDIT);
entityMgr.persist(tx);
} catch (Exception e) {
throw new ITSOBankException(e.getMessage());
}
}
public Account getAccount(String id) throws ITSOBankException {
System.out.println("getAccount: " + id);
try {
return entityMgr.find(Account.class, id);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
throw new ITSOBankException(id);
}
}
public Account[] getAccounts(String ssn) throws ITSOBankException {
System.out.println("getAccounts: " + ssn);
Query query = null;
try {
query = entityMgr.createNamedQuery("getAccountsBySSN");
query.setParameter(1, ssn);
List<Account> accountList = query.getResultList();
Account[] array = new Account[accountList.size()];
return accountList.toArray(array);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
throw new ITSOBankException(ssn);
}
}
public Customer getCustomer(String ssn) throws ITSOBankException {
System.out.println("getCustomer: " + ssn);
//Query query = null;
try {
//query = entityMgr.createNamedQuery("getCustomerBySSN");
//query.setParameter(1, ssn);
//return (Customer)query.getSingleResult();
return entityMgr.find(Customer.class, ssn);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
throw new ITSOBankException(ssn);
}
}
public Customer[] getCustomers(String partialName) throws ITSOBankException {
System.out.println("getCustomer: " + partialName);
Query query = null;
try {
query = entityMgr.createNamedQuery("getCustomersByPartialName");
query.setParameter(1, partialName);
List<Customer> beanlist = query.getResultList();
Customer[] array = new Customer[beanlist.size()];
return beanlist.toArray(array);
} catch (Exception e) {
throw new ITSOBankException(partialName);
}
}
public Customer[] getCustomersAll() {
System.out.println("getCustomers: all");
Query query = null;
try {
query = entityMgr.createNamedQuery("getCustomers");
List<Customer> beanlist = query.getResultList();
Customer[] array = new Customer[beanlist.size()];
return beanlist.toArray(array);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
return null;
}
}
public Transaction[] getTransactions(String accountID) throws ITSOBankException {
System.out.println("getTransactions: " + accountID);
Query query = null;
try {
query = entityMgr.createNamedQuery("getTransactionsByID");
query.setParameter(1, accountID);
List<Transaction> transactionsList = query.getResultList();
Transaction[] array = new Transaction[transactionsList.size()];
return transactionsList.toArray(array);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
e.printStackTrace();
throw new ITSOBankException(accountID);
}
}
public String openAccount(String ssn) throws ITSOBankException {
System.out.println("openAccount: " + ssn);
Customer customer = getCustomer(ssn);
int acctNumber = (new java.util.Random()).nextInt(899999) + 100000;
String id = "00" + ssn.substring(0, 1) + "-" + acctNumber;
Account account = new Account();
account.setId(id);
entityMgr.persist(account);
List<Customer> custSet = Arrays.asList(customer);
account.setCustomers(custSet);
System.out.println("openAccount: " + id);
return id;
}
public void transfer(String idDebit, String idCredit, BigDecimal amount) throws ITSOBankException {
System.out.println("transfer: " + idCredit + " " + idDebit + " amount " + amount);
withdraw(idDebit, amount);
deposit(idCredit, amount);
}
public void updateCustomer(String ssn, String title, String firstName, String lastName) throws ITSOBankException {
System.out.println("updateCustomer: " + ssn);
Customer customer = getCustomer(ssn);
customer.setTitle(title);
customer.setLastName(lastName);
customer.setFirstName(firstName);
System.out.println("updateCustomer: " + customer.getTitle() + " " + customer.getFirstName() + " " + customer.getLastName());
}
public void withdraw(String id, BigDecimal amount) throws ITSOBankException {
System.out.println("withdraw: " + id + " amount " + amount);
Account account = getAccount(id);
try {
Transaction tx = account.processTransaction(amount, Transaction.DEBIT);
entityMgr.persist(tx);
} catch (Exception e) {
throw new ITSOBankException(e.getMessage());
}
}
}
包itso.bank.session;
导入itso.bank.entities.Account;
导入itso.bank.entities.Customer;
导入itso.bank.entities.Transaction;
导入itso.bank.exception.itsobankeexception;
导入itso.bank.service.EJBBankService;
导入java.math.BigDecimal;
导入java.util.array;
导入java.util.List;
导入javax.ejb.Stateless;
导入javax.persistence.*;
/**
*会话Bean实现类EJBBankBean
*/
@无国籍
公共类EJBBankBean实现EJBBankService{
@PersistenceContext(unitName=“RAD8JPA”,type=PersistenceContextType.TRANSACTION)
私人实体管理者实体GR;
/**
*默认构造函数。
*/
公共EJBBankBean(){
//TODO自动生成的构造函数存根
}
public void addCustomer(Customer-Customer)抛出其异常{
System.out.println(“addCustomer:+customer.getSsn());
entityMgr.persist(客户);
}
public void closeAccount(字符串ssn,字符串id)引发ITSOBankException{
系统输出打印项次(“结账账户:+id+”客户“+ssn);
Account=getAccount(id);
事务[]trans=getTransactions(id);
用于(事务发送:trans){
整体移除(tx);
}
entityMgr.remove(账户);
System.out.println(“具有“+trans.length+”交易的封闭账户”);
}
public void deleteCustomer(字符串ssn)引发ITSOBankException{
System.out.println(“删除客户:+ssn”);
客户=getCustomer(ssn);
账户[]账户=获取账户(ssn);
对于(科目:科目){
closeAccount(ssn,acct.getId());
}
entityMgr.移除(客户);
}
公共无效存款(字符串id,BigDecimal金额)抛出其SobankException{
系统输出打印项次(“存款:+id+“金额”+金额);
Account=getAccount(id);
试一试{
交易记录tx=账户.processTransaction(金额,交易记录.信用);
实体持久性(tx);
}捕获(例外e){
抛出新的ITSOBankException(例如getMessage());
}
}
公共帐户getAccount(字符串id)引发其异常{
System.out.println(“getAccount:+id”);
试一试{
返回entityMgr.find(Account.class,id);
}捕获(例外e){
System.out.println(“异常:+e.getMessage());
抛出新的ITSOBankException(id);
}
}
公共帐户[]getAccounts(字符串ssn)引发其异常{
System.out.println(“getAccounts:+ssn”);
Query=null;
试一试{
query=entityMgr.createNamedQuery(“getAccountsBySSN”);
query.setParameter(1,ssn);
List accountList=query.getResultList();
Account[]数组=新帐户[accountList.size()];
返回accountList.toArray(数组);
}捕获(例外e){
System.out.println(“异常:+e.getMessage());
抛出新的ITSOBankException(ssn);
}
}
公共客户getCustomer(字符串ssn)抛出其SobankException{
System.out.println(“getCustomer:+ssn”);
//Query=null;
试一试{
//query=entityMgr.createNamedQuery(“GetCustomerBySN”);
//query.setParameter(1,ssn);
//return(Customer)query.getSingleResult();
返回entityMgr.find(Customer.class,ssn);
}捕获(例外e){
System.out.println(“异常:+e.getMessage());
抛出新的ITSOBankException(ssn);
}
}
公共客户[]getCustomers(字符串partialName)抛出其ObankException{
System.out.println(“getCustomer:+partialName”);
Query=null;
试一试{
query=entityMgr.createNamedQuery(“GetCustomerByPartialName”);
query.setParameter(1,partialName);
List beanlist=query.getResultList();
Customer[]数组=新客户[beanlist.size()];
返回beanlist.toArray(数组);
}捕获(例外e){
抛出新的ITSOBankException(partialName);
}
}
公共客户[]GetCustomerAll(){
System.out.println(“getCustomers:all”);
Query=null;
试一试{
query=entityMgr.createNamedQuery(“getCustomers”);
List beanlist=query.getResultList();
Customer[]数组=新客户[beanlist.size()];
返回beanlist.toArray(数组);
}捕获(例外e){
System.out.println(“异常:+e.getMessage());
返回null;
}
}
公共事务[]getTransactions(字符串accountID)引发其ObankException{
System.out.println(“getTransactions:+accountID”);
Query=null;
试一试{
query=entityMgr.createNamedQuery(“getTransactionsByID”);
query.setParameter(1,accountID);
List TransactionList=query.getResultList();
事务[]数组=新事务[TransactionList.size()];
返回TransactionList.toArray(数组);
}捕获(例外e){
System.out.println(“异常:+e.getMessage());
e、 printStackTrace();
抛出新的ITSOBankException(accountID);
}
}
公共字符串openAccount(字符串ssn)引发其异常{
System.out.println(“openAccount:+ssn”);
客户=getCustomer(ssn);
int acctNumber=(new java.util.Random()).nextInt(899999)+100000;
字符串id=“00”+ssn.子字符串(0,1)+“-”+账号;
账户=新账户();
帐户设置id(id);
entityMgr.persist(账户);
List custSet=Arrays.asList(cu
<ejb-local-ref>
<ejb-ref-name>MyBeanName</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>com.myapp.ejb.MyBeanLocal</local>
</ejb-local-ref>
<%
String lookupUrl = "java:comp/env/MyBeanName";
Context ctx = new javax.naming.InitialContext();
MyBeanNameLocal ejbLocal = (MyBeanNameLocal) ctx.lookup(lookupUrl);
String output = ejbLocal.myBusinessMethod();
%>
@Stateless
@Named("eJBBankBean")
public class EJBBankBean implements EJBBankService {....}