Liferay7 BPM门户开发之28: Portlet文件上传，及实体类同步更新上传

Posted 2020-08-19 昕友软件开发

抓住核心 -- 王昕

Liferay文件上传的核心就是使用UploadPortletRequest类

继承关系
java.lang.Object
　　extended byjavax.servlet.ServletRequestWrapper
　　　　extended byjavax.servlet.http.HttpServletRequestWrapper
　　　　　　extended bycom.liferay.util.servlet.UploadPortletRequest

实现关系：
Implemented Interfaces:

• javax.servlet.http.HttpServletRequest
• javax.servlet.ServletRequest

单一文件上传

jsp代码

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ taglib uri="http://liferay.com/tld/aui" prefix="aui"%>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui"%>
<portlet:defineObjects />
 
<portlet:actionURL name="upload" var="uploadFileURL"></portlet:actionURL>
 
<aui:form action="<%= uploadFileURL %>" enctype="multipart/form-data" method="post">
 
    <aui:input type="file" name="fileupload" />
    
    <aui:button name="Save" value="Save" type="submit" />
 
</aui:form>

 

java：

import java.io.File;
 
import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import org.apache.commons.io.FileUtils;
import com.liferay.portal.kernel.upload.UploadPortletRequest;
import com.liferay.portal.util.PortalUtil;
import com.liferay.util.bridges.mvc.MVCPortlet;
 
public class RelatedFilesPortlet extends MVCPortlet {
 
    private final static int ONE_GB = 1073741824;
    
    private final static String baseDir = "/tmp/uploaded/";
    
    private final static String fileInputName = "fileupload";
 
    public void upload(ActionRequest request, ActionResponse response)
            throws Exception {
 
        UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(request);
 
        long sizeInBytes = uploadRequest.getSize(fileInputName);
 
        if (uploadRequest.getSize(fileInputName) == 0) {
            throw new Exception("文件为空!");
        }
 
        // 从uploadRequest获得File对象
        File uploadedFile = uploadRequest.getFile(fileInputName);
 
        String sourceFileName = uploadRequest.getFileName(fileInputName);
     
        // 存储文件的目录
        File folder = new File(baseDir);
 
        // 对当前目录做可用空间检查        
        if (folder.getUsableSpace() < ONE_GB) {
            throw new Exception("空间不足1GB!");
        }
 
        // 最终的文件路径
        File filePath = new File(folder.getAbsolutePath() + File.separator + sourceFileName);
 
        // 保存文件到物理路径
        FileUtils.copyFile(uploadedFile, filePath);
        
        //以下是保存在文档库
        ThemeDisplay themeDisplay = (ThemeDisplay) actionRequest.getAttribute(WebKeys.THEME_DISPLAY);
        ServiceContext serviceContext = ServiceContextFactory.getInstance(actionRequest);
        String contentType = MimeTypesUtil.getContentType(uploadedFile);
        InputStream inputStream  = new FileInputStream(uploadedFile);
        //要保存的文档库路径
        Folder folderName = DLAppLocalServiceUtil.getFolder(parentRepositoryId, 
                                                            parentFolderId, 
                                                            "Folder Name");
        long folderId = folderName.getFolderId();
        long repositoryId = folderName.getRepositoryId();
        //保存到文档库
        FileEntry fileEntry = DLAppLocalServiceUtil.addFileEntry(themeDisplay.getUserId(), 
                                                                 repositoryId, 
                                                                 folderId, 
                                                                 uploadedFile.getName(), 
                                                                 contentType, 
                                                                 "File Name", 
                                                                 "description", 
                                                                 "changeLog", 
                                                                 inputStream, 
                                                                 uploadedFile.length(), 
                                                                 serviceContext);
    }
}

关于文档库参数说明的解释：
http://blog.csdn.net/lan861698789/article/details/8122203

和实体类一起保存文件的Demo

public void addYourEntity(ActionRequest request, ActionResponse response)
    throws Exception {

    UploadPortletRequest uploadPortletRequest =
        PortalUtil.getUploadPortletRequest(request);

    long artistId = ParamUtil.getLong(uploadPortletRequest, "artistId");
    String name = ParamUtil.getString(uploadPortletRequest, "name");
    int year = ParamUtil.getInteger(uploadPortletRequest, "year");    
    //更多的实体类信息
    ......
    
    InputStream inputStream = uploadPortletRequest.getFileAsStream("file");
    ServiceContext serviceContext = ServiceContextFactory.getInstance(
        YourEntity.class.getName(), uploadPortletRequest);

    try {
        YourEntityServiceUtil.addYourEntity(
            artistId, name, year, inputStream, serviceContext);

        SessionMessages.add(request, "YourEntityAdded");

        String redirect = ParamUtil.getString(
            uploadPortletRequest, "redirect");

        response.sendRedirect(redirect);
    }
    catch (Exception e) {
        SessionErrors.add(request, e.getClass().getName());

        if (e instanceof YourEntityNameException ||
            e instanceof PrincipalException) {

            response.setRenderParameter(
                "jspPage", "/html/YourEntitys/edit_YourEntity.jsp");
        }
        else {
            response.setRenderParameter("jspPage", "/html/error.jsp");
        }
    }
}