java - JSF : ManagedBean, 处理业务逻辑的好地方？

Question

我有fileUpload的managementBean，一旦文件上传，我需要根据从解析器下拉列表中选择的值调用不同的解析器，然后在解析器中创建DetailsClass对象，其中调用该特定类的getDetails方法，这里需要注意的是，parserClass和DetailsClass都没有在faces-config.xml中注册，我的这里的问题是

• 如果我想维护从 FileUpload 类到 Parser 类到 DetailsClass 的 session 信息，那么我应该在 faces-config.xml 中定义它，但是应该如何定义 parser 类和 DetailsClass ，它应该定义为 managementBean 还是其他东西？

这是代码:

在我的 ManagedBean 类中，我有两个函数，fileUpload 和 callParser，如下所示:

 public void uploadFile(FileEntryEvent event)
{
    FacesContext ctx = FacesContext.getCurrentInstance();
    //Setting getSession to false, container will not create new session if session is not present and return null
    HttpSession session = (HttpSession) ctx.getExternalContext().getSession(false);
    setSession(session);

    resultBean = new ResultBean();
    FileEntry fileEntry = (FileEntry) event.getSource();
    FileEntryResults results = fileEntry.getResults();
    FileEntry fe = (FileEntry) event.getComponent();

    FacesMessage msg = new FacesMessage();
    for (FileEntryResults.FileInfo fileInfo : results.getFiles())
    {
        if (fileInfo.isSaved())
        {
            File file = fileInfo.getFile();
            String filePath = file.getAbsolutePath();
            callParser(selectedItem, filePath);
        }
        resultBeanList.add(resultBean);
    }
}

private void callParser(String parserType, String filePath)
{
    if ("Delta".equals(parserType))
    {
        PositionParserDelta deltaParser = new PositionParserDelta();
        deltaParser.getQuotes(filePath);
    }
    else if ("Gamma".equals(parserType))
    {
        PositionParserGamma gammaParser = new PositionParserGamma();
        gammaParser.getQuotes(filePath);
    }
}

现在，假设我们考虑 Delta Parser，所以在该类中我有类似的内容:

public class PositionParserDelta extends Base
{
    List<String[]> dataList = new ArrayList<String[]>();
    ContractManager contractManager = new ContractManager();

    public PositionParserDelta()
    {
    }

    public void getQuotes(String fileName)
    {
        try
        {
            Map<String, ContractSeries> gsLookup = contractManager.getContractsMap(ContractManager.VendorQuotes.KRT);
            CSVReader reader = new CSVReader(new FileReader(fileName), '\t');
            String[] header = reader.readNext();
            dataList = reader.readAll();
            List<Trade> tradeBeanList = new ArrayList<Trade>();
            for (String[] data : dataList)
            {
                //Some Business Logic
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

我的contractManager类看起来像

    public class ContractManager extends Base
    {
        private List<Series> List = new ArrayList<Series>();
        private ContractSeries[] SeriesList = new Series[3];
        private ListingOps listingOps;

//This line throws error as faces class not found and it makes sense because am not registering this with faces-config.xml
        HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);

        public List<ContractSeries> getContracts(long orgId, HttpSession session)
        {
            log.info("Inside getContracts method call");
            if (false)
            {
                //Some Logic
            }
            else
            {
                try
                {
                    //Set session and get initialContext to retrieve contractSeries data from ejb calls
                    log.info("Trying to get allContractSeries data from listingOpsBean");
                    Series[] allSeries = deltaOps.findAllSeries(true);
                    Collections.addAll(contractList, allContractSeries);
                }
                catch (Exception ex)
                {

                }
            }
            return contractList;
        }

        public Map<String, ContractSeries> getContractsMap(VendorQuotes vendorQuotes)
        { //Some Logic
    }

但是在 faces-config.xml 文件中，

 <managed-bean>
        <managed-bean-name>fileUpload</managed-bean-name>
        <managed-bean-class>trade.UploadBlotterBean</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

所以基本上我的问题是，

if suppose am calling other classes from managedBean then how should they be defined in faces-config.xml and since am new to JSF, is calling other classes from managedBean and having some business logic in those classes considered good practice?

此外，我需要确保在 Parser 和 ContractMapping 类中维护在 UploadFile 中获得的 session 。

另外，

Is everything is 'registered' as managed-bean in faces-config ?

Answer 1

不确定，但我认为每个 bean 都注册为 <managed-bean>在faces-config 。就具体角色而言，一个类所扮演的角色，可以分为

1. Model Managed-Bean

2. 支持托管 Bean

3. Controller 托管 Bean

4. 支持托管 Bean

5. 实用程序托管 Bean ...

通过给它们适当的名称，您可以在 faces-config 中区分它们。根据 bean 服务的工作，设置范围。