extjs4,spring mvc3上传文件

1 页面文件
   
<link rel="stylesheet" type="text/css" href="/extjs4-file-upload-spring/extjs/resources/css/ext-all.css" />
    <script type="text/javascript" src="/extjs4-file-upload-spring/extjs/bootstrap.js"></script>


<script src="/extjs4-file-upload-spring/js/file-upload.js"></script>

</head> struts获取各种表单的数据
<body>

Click on "Browse" button (image) to select a file and click on Upload button

<div id="fi-form" style="padding:25px;"></div>
</body>

2 EXTjs的文件
   Ext.onReady(function(){

    Ext.create('Ext.form.Panel', {
        title: 'File Uploader',
        width: 400,
        bodyPadding: 10,
        frame: true,
        renderTo: 'fi-form',
        items: [{
            xtype: 'filefield',
            name: 'file',
            fieldLabel: 'File',
            labelWidth: 50,
            msgTarget: 'side',
            allowBlank: false,
            anchor: '100%',
            buttonText: 'Select a File...'
        }],

        buttons: [{
            text: 'Upload',
            handler: function() {
                var form = this.up('form').getForm();
                if(form.isValid()){
                    form.submit({
                        url: 'upload.action',
                        waitMsg: 'Uploading your file...',
                        success: function(fp, o) {
                            Ext.Msg.alert('Success', 'Your file has been uploaded.');
                        }
                    });
                }
            }
        }]
    });

});

3 上传文件的bean

import org.springframework.web.multipart.commons.CommonsMultipartFile;

public class FileUploadBean {

   private CommonsMultipartFile file;

   public CommonsMultipartFile getFile() {
       return file;
   }

   public void setFile(CommonsMultipartFile file) {
       this.file = file;
   }
}

4 为了让extjs显示信息，再设计一个bean

public class ExtJSFormResult {

   private boolean success;

   public boolean isSuccess() {
       return success;
   }
   public void setSuccess(boolean success) {
       this.success = success;
   }

   public String toString(){
       return "{success:"+this.success+"}";
   }
}

这里其实是返回是否成功

5 controller层

@Controller
@RequestMapping(value = "/upload.action")
public class FileUploadController {

   @RequestMapping(method = RequestMethod.POST)
   public @ResponseBody String create(FileUploadBean uploadItem, BindingResult result){

       ExtJSFormResult extjsFormResult = new ExtJSFormResult();

       if (result.hasErrors()){
           for(ObjectError error : result.getAllErrors()){
               System.err.println("Error: " + error.getCode() + " - " + error.getDefaultMessage());
           }

           //set extjs return - error
           extjsFormResult.setSuccess(false);

           return extjsFormResult.toString();
       }

       // Some type of file processing...
       System.err.println("-------------------------------------------");
       System.err.println("Test upload: " + uploadItem.getFile().getOriginalFilename());
       System.err.println("-------------------------------------------");
       if(uploadItem.getFile().getSize()>0){
                try {
                    SaveFileFromInputStream(uploadItem.getFile().getInputStream(),"D://",uploadItem.getFile().getOriginalFilename());
                } catch (IOException e) {
                    System.out.println(e.getMessage());
                    return null;
                }
            }
       //set extjs return - sucsess
       extjsFormResult.setSuccess(true);

       return extjsFormResult.toString();
   }

   /* **保存文件

       * @param stream
       * @param path
       * @param filename
       * @throws IOException
       */
      public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException
      {
       FileOutputStream fs=new FileOutputStream(path + "/"+ filename);
       byte[] buffer=new byte[1024*1024];
       int bytesum = 0;
          int byteread = 0;
            while ((byteread=stream.read())!=-1)
            {
               bytesum+=byteread;

                  fs.write(buffer,0,byteread);
                  fs.flush();

            }
            fs.close();
            stream.close();
      }

可以看到，当出现错误时，extjsFormResult.setSuccess(false);
return extjsFormResult.toString();
这两句返回给前端ext js处理。
最后就是配置MVC了

<context:annotation-config />

    
    <context:component-scan base-package="com.loiane"/>

    
    <import resource="mvc-config.xml"/>

    
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        
        <property name="maxUploadSize" value="100000"/>

    </bean>

设置文件大小限制
一个很奇怪的问题是，在ie 7下，好象有点问题，待解决，但在firefox和chrome下都没问题，这个extjs 真怪，不用ext，普通的spring mvc是没问题的哦

extjs4,spring mvc3上传文件

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