GWTEXT下载

GWT实现文件上传下载
关键字: gwt实现文件上传 下载

主要采用的两个包gwtextux.jar(0.4版本)和commons- fileupload-1.2.1.jar来完成。

在gwt.xml里添加此内容

如你所见,相关JS(在gwtextux.jar包里)放在public/js/下面,与 xml对应


Xml代码

   1. <module> 
   2.       <entry-point class='com.google.gwt.client.test'/> 
   3.       <stylesheet src='test.css' /> 
   4.         <stylesheet src="js/resources/css/ext-all.css" /> 
   5.     <script src="js/adapter/ext/ext-base.js" /> 
   6.     <script src="js/ext-all.js" />  
   7.      <inherits name="com.gwtext.GwtExt"/> 
   8.  
   9.  
  10.  
  11.             <!-- upload              --> 
  12. <servlet path="/UploadSvc" class="com.google.gwt.service.UploadSvcImpl" /> 
  13. <inherits name="com.gwtextux.GwtExtUx"/> 
  14. <inherits name="com.gwtextux.UploadDialog"/> 
  15. <script src="js/Ext.ux.UploadDialog.js" /> 
  16.         <!-- upload              --> 
  17.  
  18. </module> 

<module>
      <entry-point class='com.google.gwt.client.test'/>
      <stylesheet src='test.css' />
<stylesheet src="js/resources/css/ext-all.css" />
<script src="js/adapter/ext/ext-base.js" />
<script src="js/ext-all.js" />
<inherits name="com.gwtext.GwtExt"/>



        <!-- upload              -->
<servlet path="/UploadSvc" class="com.google.gwt.service.UploadSvcImpl" />
<inherits name="com.gwtextux.GwtExtUx"/>
<inherits name="com.gwtextux.UploadDialog"/>
<script src="js/Ext.ux.UploadDialog.js" />
<!-- upload              -->

</module>


  客户端:
Java代码

   1.  import com.google.gwt.core.client.EntryPoint;   
   2.  import com.google.gwt.user.client.ui.RootPanel;   
   3.  import com.gwtext.client.widgets.Button;   
   4.  import com.gwtext.client.widgets.Panel;   
   5.  import com.gwtext.client.widgets.event.ButtonListenerAdapter;   
   6.  import com.gwtext.client.core.EventObject;   
   7.  import com.gwtext.client.core.UrlParam;   
   8.  import com.gwtextux.client.widgets.upload.UploadDialog;   
   9.  
  10. public class UploadDialogSample implements EntryPoint{   
  11.           
  12.      public void onModuleLoad() {   
  13.          Panel panel = new Panel();   
  14.          Button button = new Button("Upload File", new ButtonListenerAdapter() {   
  15.              public void onClick(final Button button, EventObject e) {   
  16.            UploadDialog dialog = new UploadDialog();   
  17.                         //于xml对应 
  18.            dialog.setUrl("UploadSvc");   
  19.                        //上传文件类型 
  20.            //dialog.setPermittedExtensions(new String[]{"jpg", "gif"});  
  21.                        //参数 
  22.              UrlParam param[] = new UrlParam[2];   
  23.              param[0]=new UrlParam("name1", "value1");   
  24.              param[1]=new UrlParam("name2", "value2");   
  25.              dialog.setBaseParams(param);   
  26.                                      //上传数据名称 并非文件名 
  27.              dialog.setPostVarName("myvar");   
  28.              dialog.show();   
  29.                      }   
  30.                  });   
  31.              panel.add(button);   
  32.              RootPanel.get().add(panel);   
  33.  
  34.          }   
  35.      }   

import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.user.client.ui.RootPanel; 
import com.gwtext.client.widgets.Button; 
import com.gwtext.client.widgets.Panel; 
import com.gwtext.client.widgets.event.ButtonListenerAdapter; 
import com.gwtext.client.core.EventObject; 
import com.gwtext.client.core.UrlParam; 
import com.gwtextux.client.widgets.upload.UploadDialog; 

public class UploadDialogSample implements EntryPoint{ 

public void onModuleLoad() { 
Panel panel = new Panel(); 
Button button = new Button("Upload File", new ButtonListenerAdapter() { 
     public void onClick(final Button button, EventObject e) { 
       UploadDialog dialog = new UploadDialog(); 
                        //于xml对应
       dialog.setUrl("UploadSvc"); 
                       //上传文件类型
       //dialog.setPermittedExtensions(new String[]{"jpg", "gif"});
                       //参数
     UrlParam param[] = new UrlParam[2]; 
     param[0]=new UrlParam("name1", "value1"); 
     param[1]=new UrlParam("name2", "value2"); 
     dialog.setBaseParams(param); 
                             //上传数据名称 并非文件名
     dialog.setPostVarName("myvar"); 
     dialog.show(); 
         } 
     }); 
     panel.add(button); 
     RootPanel.get().add(panel); 

     } 
} 












服务端:
Java代码

   1. import java.io.BufferedInputStream; 
   2. import java.io.BufferedOutputStream; 
   3. import java.io.File; 
   4. import java.io.FileOutputStream; 
   5. import java.io.IOException; 
   6. import java.io.InputStream; 
   7. import javax.servlet.ServletException; 
   8. import javax.servlet.http.HttpServlet; 
   9. import javax.servlet.http.HttpServletRequest; 
  10. import javax.servlet.http.HttpServletResponse; 
  11.  
  12. import org.apache.commons.fileupload.FileItemIterator; 
  13. import org.apache.commons.fileupload.FileItemStream; 
  14. import org.apache.commons.fileupload.servlet.ServletFileUpload; 
  15. import org.apache.commons.fileupload.util.Streams; 
  16.  
  17. import com.google.gwt.core.client.GWT; 
  18.  
  19. public class UploadSvcImpl extends HttpServlet { 
  20.  
  21.     private static final long serialVersionUID = 1L; 
  22.  
  23.     protected void doPost(HttpServletRequest req, HttpServletResponse resp) 
  24.             throws ServletException, IOException { 
  25.  
  26.         /*
  27.          * The following commented code uses Apache Commons Upload
  28.          */ 
  29.         // Check that we have a file upload request 
  30.         boolean isMultipart = ServletFileUpload.isMultipartContent(req); 
  31.         GWT.log("is multipart? " + Boolean.toString(isMultipart), null); 
  32.         // Create a new file upload handler 
  33.         ServletFileUpload upload = new ServletFileUpload(); 
  34.  
  35.         try { 
  36.             // Parse the request 
  37.             FileItemIterator iter = upload.getItemIterator(req); 
  38.             while (iter.hasNext()) { 
  39.                 FileItemStream item = iter.next(); 
  40.                 String name = item.getFieldName(); 
  41.                 InputStream stream = item.openStream(); 
  42.                 if (item.isFormField()) { 
  43.                     System.out.println("Form field " + name + " with value " 
  44.                             + Streams.asString(stream) + " detected."); 
  45.                 } else { 
  46.                     System.out.println("File field " + name 
  47.                             + " with file name " + item.getName() 
  48.                             + " detected."); 
  49.                     BufferedInputStream inputStream = new BufferedInputStream( 
  50.                             stream);// 获得输入流 
  51.                     BufferedOutputStream outputStream = new BufferedOutputStream( 
  52.                             new FileOutputStream(new File("/var/app/fax/" 
  53.                                     + item.getName())));// 获得文件输出流 
  54.                     Streams.copy(inputStream, outputStream, true); // 开始把文件写到你指定的上传文件夹 
  55.                 } 
  56.                 stream.close(); 
  57.             } 
  58.             System.out.println("上传成功!"); 
  59.         } catch (Exception ex) { 
  60.             ex.printStackTrace(); 
  61.         } 
  62.     } 
  63.  
  64. } 

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

import com.google.gwt.core.client.GWT;

public class UploadSvcImpl extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {

/*
* The following commented code uses Apache Commons Upload
*/
// Check that we have a file upload request
boolean isMultipart = ServletFileUpload.isMultipartContent(req);
GWT.log("is multipart? " + Boolean.toString(isMultipart), null);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload();

try {
// Parse the request
FileItemIterator iter = upload.getItemIterator(req);
while (iter.hasNext()) {
FileItemStream item = iter.next();
String name = item.getFieldName();
InputStream stream = item.openStream();
if (item.isFormField()) {
System.out.println("Form field " + name + " with value "
+ Streams.asString(stream) + " detected.");
} else {
System.out.println("File field " + name
+ " with file name " + item.getName()
+ " detected.");
BufferedInputStream inputStream = new BufferedInputStream(
stream);// 获得输入流
BufferedOutputStream outputStream = new BufferedOutputStream(
new FileOutputStream(new File("/var/app/fax/"
+ item.getName())));// 获得文件输出流
Streams.copy(inputStream, outputStream, true); // 开始把文件写到你指定的上传文件夹
}
stream.close();
}
System.out.println("上传成功!");
} catch (Exception ex) {
ex.printStackTrace();
}
}

}





你也可以直接访问http://max-bazhenov.com/dev/upload- dialog-2.0/index.php 



下载:

grid里双击触发下载
Java代码

   1. protected void onGridRowDblClick(GridPanel grid, int rowIndex, EventObject e) { 
   2.              // test.rar在 public目录下 
   3.     Window.open(GWT.getHostPageBaseURL()+"test.rar", "", ""); 
   4. } 

protected void onGridRowDblClick(GridPanel grid, int rowIndex, EventObject e) {
              // test.rar在 public目录下
Window.open(GWT.getHostPageBaseURL()+"test.rar", "", "");
}





    * commons-fileupload-1.2.1.jar (56.4 KB)
    * 下载次数: 113

    * gwtextux.jar (1.4 MB)
    * 下载次数: 219
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