FlexPetStore--集成Flex和Spring (2)

Flex部署在Flex Builder幫助中有詳細說明（如部署目錄結構）。遺憾的是沒有例子介紹Flex如何集成Spring。本文嘗試解釋這部分內容。由於機器重裝，導致FlexPetStore的項目丟失，幸好是覆蓋安裝留下了可運行的WAR。

FlexPetStore通過RemoteObject技術訪問JPetStoreFacade業務對象（引入一個FacadeAccessor對象），因此使用了Flex Data Service 2.0。

大致流程:

Flex (ActionScript )<--> AMF協議(AMF協議編碼)<-->(解碼)<-->FacadeAccessor (Java) <--> PetStoreFacade (Java)<--> ...

看了一下 FDS 2.0 提供的幾個應用WAR，發現只要按照Flex的部署思路，在現有WAR基礎上適當修改就可以集成Flex和Spring。首先需要把flex.war該名爲flexpetstore.war，現在按照一下介紹逐步修改。

Spring集成

1. 加入Lib庫。把spring.jar和jpetsotre.jar放到 flexpetstore\WEB-INF\lib下，這是運行Spring和JPetstore的必備包。
2. 修改flexpetstore.war的web.xml，經過一番對比和試驗找到兩個段落需要修改。
   a. 添加web應用根目錄和Spring應用上下文以及數據訪問資源配置。
   b. 添加Remoting、web service。struts部分極有可能多餘，因爲沒有action來Request。有待測試。
   c. 修改welcome-file-list，FlexPetStore.html是FlexPetStore項目名稱
  

到此爲止，集成Spring配置基本完成。還有一部分服務端的Java代碼作爲RemoteObject供Flex訪問，下一部分再講解。

附件是兩份web.xml。

FacadeAccessor首先獲取應用context，然後從context得到PetStoreFacade業務對象。

java 代碼

// Decompiled by DJ v2.9.9.60 Copyright 2000 Atanas Neshkov  Date: 2007-05-22 22:12:45
// Home Page : http://members.fortunecity.com/neshkov/dj.html  - Check often for new version!
// Decompiler options: packimports(3)
// Source File Name:   FacadeAccessor.java

package org.springframework.samples.jpetstore.domain.logic.flex;

import java.io.*;
import java.util.List;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.samples.jpetstore.domain.*;
import org.springframework.samples.jpetstore.domain.logic.PetStoreFacade;
import org.springframework.samples.jpetstore.domain.logic.flex.exception.NotFoundBeanDifinitionException;
import org.springframework.samples.jpetstore.domain.logic.flex.exception.OutputBeanDifinitionException;

public class FacadeAccessor {

    public FacadeAccessor() {
        petStoreFacade = null;
        init();
    }

    private void init() {
        try {
            getPetStoreFacade();
        } catch (Exception exception) {
        }
    }

    private PetStoreFacade getPetStoreFacade()
            throws NotFoundBeanDifinitionException,
            OutputBeanDifinitionException {
        if (petStoreFacade == null) {
            ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(
                    "/applicationContext*.xml");
            String beanDefinitionNames[] = ctx.getBeanDefinitionNames();
            if (beanDefinitionNames == null || beanDefinitionNames.length < 1)
                throw new NotFoundBeanDifinitionException(
                        "Not found bean difinitions.");
            petStoreFacade = (PetStoreFacade) ctx.getBean("petStore");
        }
        return petStoreFacade;
    }

    private void outputBeanDefinitionNames(String beanDefinitionNames[])
            throws OutputBeanDifinitionException {
        if (beanDefinitionNames != null && beanDefinitionNames.length > 0) {
            DataOutputStream out = null;
            try {
                out = new DataOutputStream(new BufferedOutputStream(
                        new FileOutputStream("c:\\beandifinitions.txt")));
                for (int i = 0; i < beanDefinitionNames.length; i++)
                    out.writeBytes((new StringBuilder(String
                            .valueOf(beanDefinitionNames[i]))).append("\r\n")
                            .toString());

                out.close();
            } catch (IOException e) {
                throw new OutputBeanDifinitionException((new StringBuilder(
                        "error occurs when output bean difinitions to file,"))
                        .append(e.getMessage()).toString());
            }
        }
    }

    public Account getAccount(String username) {
        return petStoreFacade.getAccount(username);
    }

    public Account getAccount(String username, String password) {
        return petStoreFacade.getAccount(username, password);
    }

    public void insertAccount(Account account) {
        petStoreFacade.insertAccount(account);
    }

    public void updateAccount(Account account) {
        petStoreFacade.updateAccount(account);
    }

    public List getUsernameList() {
        return petStoreFacade.getUsernameList();
    }

    public List getCategoryList() {
        return petStoreFacade.getCategoryList();
    }

    public Category getCategory(String categoryId) {
        return petStoreFacade.getCategory(categoryId);
    }

    public List getProductListByCategory(String categoryId) {
        return petStoreFacade.getProductListByCategory(categoryId);
    }

    public List searchProductList(String keywords) {
        return petStoreFacade.searchProductList(keywords);
    }

    public Product getProduct(String productId) {
        return petStoreFacade.getProduct(productId);
    }

    public List getItemListByProduct(String productId) {
        return petStoreFacade.getItemListByProduct(productId);
    }

    public Item getItem(String itemId) {
        return petStoreFacade.getItem(itemId);
    }

    public boolean isItemInStock(String itemId) {
        return petStoreFacade.isItemInStock(itemId);
    }

    public void insertOrder(Order order) {
        petStoreFacade.insertOrder(order);
    }

    public Order getOrder(int orderId) {
        return petStoreFacade.getOrder(orderId);
    }

    public List getOrdersByUsername(String username) {
        return petStoreFacade.getOrdersByUsername(username);
    }

    private static final boolean output = false;

    private static final String OUTPUT_BEANDIFINITIONS_PATHFILE = "c:\\beandifinitions.txt";

    private static final String APPLICATION_CONTEXT_XML = "/applicationContext*.xml";

    private PetStoreFacade petStoreFacade;
}