adf中用inputFile上传文件到weblogic 方法1

上传文件有两种，一是直接上传文件到到服务器的某个路径下 二是直接上传文件内容到数据库

这里首先是上传到路径下实例

由于weblogic中获得路径只能用getServletContext().getResource("/").getPath(),有没有其它方法我不知道。我只知道不能用getRealPath()

问题描述：在tomcat服务器和webspare服务器，以这样的方式都能够得到完整的服务器路径，

                 但迁移到weblogic之后，就得不到了，返回的就是null！

原因：weblogic是以war包的形式发布的，并没有realPath，故不能用 getServletContext().getRealPath("/")获得绝对路径！

解决办法：修改代码获得相对路径：

把代码getServletContext().getRealPath("/")  修改成 getServletContext().getResource("/")既可以解决此问题！

实例如下

 <af:form id="f1" usesUpload="true">

        <af:inputFile label="文件名:" id="if1"

                      valueChangeListener="#{MyBackingBean.valueListener}"

                      binding="#{MyBackingBean.fileUI}" autoSubmit="true"

                      value="#{MyBackingBeanBean}"/>

        <af:commandButton text="upload" id="cb1"

                          actionListener="#{MyBackingBean.commonListener}"/>

      </af:form>

注意 autoSubmit="true"没有设置，属性监听器就没作用

    private RichInputFile fileUI;

    private String fileLocation = "/upload";

    private UploadedFile uploadedFile;

    public void valueListener(ValueChangeEvent valueChangeEvent) {

        // Add event code here...

        FacesContext facesContext = FacesContext.getCurrentInstance();

        ExternalContext externalContext = facesContext.getExternalContext();

        HttpServletRequest request =(HttpServletRequest)externalContext.getRequest();

        String root = "";

        try {

            root =request.getSession().getServletContext().getResource("/").getPath();

        } catch (MalformedURLException e) {

        }

        if (!new File(root + fileLocation).exists()) {

            new File(root + fileLocation).mkdirs();

        }

        UploadedFile file = (UploadedFile)valueChangeEvent.getNewValue();

        if (file != null && file.getLength() > 0) {

            try {

                InputStream in = file.getInputStream();

                FileOutputStream out =

                    new FileOutputStream(root + fileLocation + "/" +

                                         file.getFilename());

                writeInputStreamToOutputStream(in, out);

                in.close();

                out.close();

                String message =

                    "Successfully uploaded file '" + file.getFilename() +

                    "' (" + file.getLength() + " bytes)";

                System.out.println(message);

            } catch (FileNotFoundException fnfe) {

                // TODO: Add catch code

                fnfe.printStackTrace();

            } catch (IOException ioe) {

                // TODO: Add catch code

                ioe.printStackTrace();

            }

        }

    }