GWT & apache-commons-fileUpload 轻松实现文件上传

gwt使用apache-commons-fileUpload,轻松实现文件上传，图片上传等功能。

 

 

1.gwt 前端页面（可以做成组建，供各个模块调用）

		FormPanel formPanel  = new FormPanel();
		formPanel.setAction("/uploadImage");

		formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
		formPanel.setMethod(FormPanel.METHOD_POST);

		FlowPanel panel = new FlowPanel();
		formPanel.setWidget(panel);

		FileUpload fileUpload = new FileUpload();
		fileUpload.setName("file");
		panel.add(fileUpload);

ok,formpanel触发sumbit即可。下面便是servlet端的实现。           

 

2.servlet端

FileItemFactory factory = new DiskFileItemFactory();   
ServletFileUpload upload = new ServletFileUpload(factory);   
  
List items = null;   
  
try {   
    items = upload.parseRequest(request);   
} catch (FileUploadException ex) {   
    throw new ServletException(ex);   
}   
  
Iterator iter = items.iterator();   
  
while (iter.hasNext()) {   
    FileItem item = (FileItem) iter.next();   
    if (item.isFormField() == false) {   
         //获得byte数组
        byte[] bytes = item.get();
        //或直接保存成文件
        File file = new FIle("D:/temp",item.getName());    
        item.write(file);//直接保存文件        
    }   
}