Primefaces p：带数据表的fileDownload [英] Primefaces p:fileDownload with datatable

问题描述

我有一个返回文件夹所有文件的数据表，可以使用primefaces p：filedownload资源下载该文件。

I got a datatable that return all files of a folder, and that file can be downloaded using the primefaces p:filedownload resource.

它工作正常，但是当代码加载时，我无法修改文件，因为FileInputStream是oppened。
如果我在数据表加载期间关闭FileInputStream，p：filedownload不起作用

It is working fine, but when the code is loaded i cant modify the file because the FileInputStream is oppened. And if i close the FileInputStream during the datatable load, p:filedownload doesnt work

任何人？

（如果我取消注释注释部分，filedownload不起作用，如果我保留它，我不能通过windows编辑文件）

(If i uncomment the commented part, the filedownload doesnt work, and if i keep it, i cant edit the file trough the windows)

Java：

public List<StreamedContent> getAnexosQuestionarios() {
List<StreamedContent> resultado = new ArrayList<StreamedContent>();
File[] arquivos = FileHelper.listarArquivos(selected.getEmpresa().getDiretorio(), FileHelper.QUESTIONARIOS);

if (arquivos != null) {
    for (File arquivo : arquivos) {
    InputStream stream = null;
    try {
        stream = new FileInputStream(arquivo.getAbsolutePath());
        String extensao = arquivo.getName().substring(arquivo.getName().lastIndexOf(".") + 1);

        StreamedContent file = new DefaultStreamedContent(stream,
        MimeTypes.valueOf(extensao).getMimeType(),
        arquivo.getName());
        resultado.add(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    }
    // try {
    // stream.close();
    // } catch (IOException e) {
    // // TODO Auto-generated catch block
    // e.printStackTrace();
    // }
}
return resultado;
}

HTML：

<p:panel header="Questionários">
                    <p:dataTable id="dtAnexosQuestionarios"
                        value="#{tecnologiaEmpresaController.anexosQuestionarios}"
                        var="arquivo" widgetVar="dtAnexosQuestionarios"
                        emptyMessage="Nenhum anexo disponível"
                        style="width:50%; border:2 !important; border-color:white !important;">
                        <p:column headerText="" style="width:20px;">
                            <h:graphicImage
                                value="../resources/images/#{tecnologiaEmpresaController.getExtensao(arquivo.name)}.png" />
                        </p:column>
                        <p:column headerText="Arquivo">
                            <p:commandLink id="downloadLink" value="#{arquivo.name}"
                                ajax="false">
                                <p:fileDownload value="#{arquivo}" />
                            </p:commandLink>
                        </p:column>
                    </p:dataTable>
                </p:panel>

谢谢!!

推荐答案

这个问题已经解决了，感谢sabrina.bettini

The question was solved, thanks to sabrina.bettini

这里我的代码已修好：

填写数据表的代码：

    public List<StreamedContent> getAnexosInformacoes() {
List<StreamedContent> resultado = new ArrayList<StreamedContent>();
File[] arquivos = FileHelper.listarArquivos(selected.getEmpresa().getDiretorio(), FileHelper.INFORMACOES);

if (arquivos != null) {
    for (File arquivo : arquivos) {
    InputStream stream = null;
    try {
        stream = new FileInputStream(arquivo.getAbsolutePath());
        String extensao = arquivo.getName().substring(arquivo.getName().lastIndexOf(".") + 1);

        StreamedContent file = new DefaultStreamedContent(stream,MimeTypes.valueOf(extensao).getMimeType(),arquivo.getName());
        resultado.add(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    try {
        stream.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
}

return resultado;
}

使用actionlistener打开文件的代码：

Code to open the file, using actionlistener:

StreamedContent arquivo;

public void prepararArquivoInformacoes(final StreamedContent arq) {
InputStream stream = null;
String caminho = FileHelper.retornarCaminhoPasta(selected.getEmpresa().getDiretorio(), FileHelper.INFORMACOES);
try {
    stream = new FileInputStream(caminho + File.separator + arq.getName());
    this.arquivo = new DefaultStreamedContent(stream, MimeTypes.valueOf("pdf").getMimeType(), arq.getName());
} catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
}

public StreamedContent getArquivo() {
return arquivo;
}

HTML：

        <p:panel header="Informações">
                <p:dataTable id="dtAnexosInformacoes"
                    value="#{tecnologiaEmpresaController.anexosInformacoes}"
                    var="arquivo" widgetVar="dtAnexosInformacoes"
                    emptyMessage="Nenhum anexo disponível"
                    style="width:50%; border:2 !important; border-color:white !important;">
                    <p:column headerText="" style="width:20px;">
                        <h:graphicImage
                            value="../resources/images/#{tecnologiaEmpresaController.getExtensao(arquivo.name)}.png" />
                    </p:column>
                    <p:column headerText="Arquivo">
                        <p:commandLink id="downloadLink" value="#{arquivo.name}" 
                            ajax="false" actionListener="#{tecnologiaEmpresaController.prepararArquivoInformacoes(arquivo)}">
                            <p:fileDownload value="#{tecnologiaEmpresaController.arquivo}" />
                        </p:commandLink>
                    </p:column>
                </p:dataTable>
            </p:panel>
        </p:panel>

FileHelper：

FileHelper:

static FileService fileService;

public static final String PASTA_RAIZ = "P:\\";
public static final String INFORMACOES = "1. Informacoes";
public static final String QUESTIONARIOS = "2. Questionarios";
public static final String RELATORIOS = "3_Relatorio";

public static File[] listarArquivos(final String empresa, final String tipo) {
File file = new File(PASTA_RAIZ + empresa + File.separator + tipo + File.separator);
return file.listFiles();
}

public static String retornarCaminhoPasta(final String empresa, final String tipo) {
File file = new File(PASTA_RAIZ + empresa + File.separator + tipo + File.separator);
return file.getAbsolutePath();
}

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