文件上传(记得关闭流)

form：

name="smwd" label="导入" widget="FileUploader" referWidgets="param">
 name="destform">fwglAdd
 name="action">upload
 name="fileTypes">*.doc;*.docx
 name="fileAmount">1

action：

try {
    Map, File> l = (Map) bus.getValue("smwd");
 if (l == null || l.isEmpty())
 return;
 for (String key : l.keySet()) {

 System.out.println(" file name is: " + l.keySet());

 File file = (File) l.get(key);
 FileInputStream in = new FileInputStream(file);
 String guid = java.util.UUID.randomUUID().toString().replaceAll("-", "").toUpperCase();
 String d = System.getProperty("file.separator");//代表一个"/"
 String path1 = String.valueOf(FileUpLoadAction.class.getResource(""));
 System.out.println(path1.substring(6, path1.length()));
 String os1 = System.getProperty("os.name");
 if(os1.toLowerCase().startsWith("win")){//判断是不是windows操作系统
 File writeFile = new File(path1.substring(6, path1.length()) + "upload" + d + guid + "_" + key);
 FileOutputStream os = new FileOutputStream(writeFile);
 byte[] b = new byte[1024];
 int i = 0;
 while ((i = in.read(b)) != -1) {
 os.write(b, 0, i);
 }
 os.flush();//很重要
 form.updateWidgetValue("path", writeFile);
 form.updateWidgetValue("smwdmc", key);
 in.close();//很重要
 os.close();//很重要
 }else{//如果是linux操作系统，路径前边要多加一个 "/"
 File writeFile = new File(d+path1.substring(6, path1.length()) + "upload" + d + guid + "_" + key);
 FileOutputStream os = new FileOutputStream(writeFile);
 byte[] b = new byte[1024];
 int i = 0;
 while ((i = in.read(b)) != -1) {
 os.write(b, 0, i);
 }
 os.flush();//很重要
 form.updateWidgetValue("path", writeFile);
 form.updateWidgetValue("smwdmc", key);
 in.close();//很重要
 os.close();//很重要
 }


 }

} catch (Exception e) {

 e.printStackTrace();

}