gwt 前端上传,下载demo
package com.appdev.bsf.vehicletracking.client.fileUpload;
import com.appdev.bsf.common.client.messagebox.MessageBox;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
import com.google.gwt.user.client.ui.FormPanel.SubmitEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitHandler;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.layout.HLayout;
/**
??*
?*/
public class DemoGwtFileUploadLayout extends HLayout {
??? private FormPanel formPanel = null;
??? public DemoGwtFileUploadLayout() {
??? ??? setWidth(200);
??? ??? final FileUpload fileUpLoad = new FileUpload();
??? ??? // 名字必须与实体存路径的名字一致
??? ??? fileUpLoad.setName("imageFileUpload");
??? ??? formPanel = new FormPanel();
??? ??? formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
??? ??? formPanel.setMethod(FormPanel.METHOD_POST);
??? ??? formPanel.setWidget(fileUpLoad);
??? ??? final IButton btnUpload = new IButton("upLoadButton");
??? ??? btnUpload.addClickHandler(new ClickHandler() {
??? ??? ??? @Override
??? ??? ??? public void onClick(ClickEvent event) {
??? ??? ??? ??? formPanel.submit();
??? ??? ??? }
??? ??? });
??? ??? formPanel.addSubmitHandler(new SubmitHandler() {
??? ??? ??? @Override
??? ??? ??? public void onSubmit(SubmitEvent event) {
??? ??? ??? ??? // 必须带参数id和clsUrl, 参数名必须是id,clsUrl
??? ??? ??? ??? formPanel.setAction(GWT.getModuleBaseURL() + "fileupload?id=1&clsUrl=" + Object.class);
??? ??? ??? ??? if (fileUpLoad.getFilename().length() == 0) {
??? ??? ??? ??? ??? MessageBox.getInstance().initComponents("必须选择一个文件");
??? ??? ??? ??? ??? event.cancel();
??? ??? ??? ??? } else if (!fileUpLoad.getFilename().toLowerCase().endsWith(".jpg")
??? ??? ??? ??? ??? ??? && !fileUpLoad.getFilename().toLowerCase().endsWith(".gif")) {
??? ??? ??? ??? ??? event.cancel();
??? ??? ??? ??? }
??? ??? ??? }
??? ??? });
??? ??? formPanel.addSubmitCompleteHandler(new SubmitCompleteHandler() {
??? ??? ??? @Override
??? ??? ??? public void onSubmitComplete(SubmitCompleteEvent event) {
??? ??? ??? ??? String result = event.getResults();
??? ??? ??? ??? if ("".equals(result)) {
??? ??? ??? ??? ??? MessageBox.getInstance().initComponents("文件上传成功");
??? ??? ??? ??? } else {
??? ??? ??? ??? ??? MessageBox.getInstance().initComponents("文件上传失败");
??? ??? ??? ??? }
??? ??? ??? }
??? ??? });
??? ??? addMember(formPanel);
??? ??? addMember(btnUpload);
??? }
}
/**
?* 下载文件
?*
?* @author wubin E-Mail:wubin3347@gmail.com
?*
?*/
class DownLoadLayout extends HLayout {
??? public DownLoadLayout() {
??? ??? IButton downLoad = new IButton("下载", new ClickHandler() {
??? ??? ??? @Override
??? ??? ??? public void onClick(ClickEvent event) {
??? ??? ??? ??? /**
??? ??? ??? ??? ?* 必须带参数名,参数名必须为url
??? ??? ??? ??? ?*/
??? ??? ??? ??? Window.open(GWT.getModuleBaseURL() + "filedownload?url=/uploads/2011/10/19/SNV83367.JPG",
??? ??? ??? ??? ??? ??? "dd", "image");
??? ??? ??? }
??? ??? });
??? ??? addMember(downLoad);
??? }
}
