本文講解下extjs4結合spring mvc3的註解完成上傳文件的例子。
1 頁面文件
<!– Ext JS Files –>
<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>
<!– file upload form –>
<script src="/extjs4-file-upload-spring/js/file-upload.js"></script>
</head>
<body>
Click on "Browse" button (image) to select a file and click on Upload button
<p id="fi-form" style="padding:25px;"></p>
</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 上傳文件的bean
Java代碼
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 為瞭讓extjs顯示信息，再設計一個bean
Java代碼
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+"}";
}
}
這裡其實是返回是否成功
5 controller層
Java代碼
@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，當出現錯誤時，extjsFormResult.setSuccess(false);
return extjsFormResult.toString();
這兩句返回給前端ext js處理。
最後就是配置MVC瞭
Java代碼
<!– Activates various annotations to be detected in bean classes –>
<context:annotation-config />
<!– Scans the classpath of this application for @Components to deploy as beans –>
<context:component-scan base-package="com.loiane"/>
<!– Configures Spring MVC –>
<import resource="mvc-config.xml"/>
<!– Configure the multipart resolver –>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!– one of the properties available; the maximum file size in bytes –>
<property name="maxUploadSize" value="100000"/>
</bean>
設置文件大小限制
一個很奇怪的問題是，在ie 7下，好象有點問題，待解決，但在firefox和chrome下都沒問題，這個extjs 真怪，不用ext，普通的spring mvc是沒問題的哦
