本文实例为大家分享了SpringMvc3+extjs4实现上传与下载的具体代码，供大家参考，具体内容如下
最近生活过的很充实，人一直在不停的忙碌着学习新东西。这是我最近遇到的问题，我找度娘n了很久，终于找到了解决方案！
前台代码:
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<script>
Ext.onReady(function() {
Ext.create('Ext.form.Panel', {
title : '文件上传',
width : 400,
bodyPadding : 10,
frame : true,
renderTo : document.body,
items : [ {
xtype : 'filefield',
name : '文件',
fieldLabel : 'File',
labelWidth : 50,
msgTarget : 'side',
allowBlank : false,
anchor : '100%',
buttonText : '请选择文件...'
} ],
buttons : [ {
text : '上传',
handler : function() {
var form = this.up('form').getForm();
if (form.isValid()) {
form.submit({
url : '根路径/fileUploadDown/fileUpload',
waitMsg : '正在上传文件中...',
success : function(fp, o) {
Ext.Msg.alert('上传文件成功!');
}
});
}
}
} ]
});
});
</script>
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后台代码：
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/**
*记录返回结果*/
class ExtJSFormResult {
private boolean success;
public boolean isSuccess() {
return success;
}
public void setSuccess(boolean success) {
}
public String toString() {
return "{success:" + this.success + "}";
}
}
class FileUploadBean {
private CommonsMultipartFile file;
public CommonsMultipartFile getFile() {
return file;
}
public void setFile(CommonsMultipartFile file) {
this.file = file;
}
}
/**
* 文件的上传与下载
* @author Administrator
*
*/
@Controller
@RequestMapping(value = "/fileUploadDown")
public class FileUploadAndDownController {
private static int countter=1; //定义一个计数器,用于上传文件的重命名
@Autowired
private ProAnnexDao<ProAnnex> proAnnextDao;
public void setProAnnextDao(ProAnnexDao<ProAnnex> proAnnextDao) {
this.proAnnextDao = proAnnextDao;
}
@RequestMapping(value="fileUpload",method = RequestMethod.POST)
public @ResponseBody String create(RedirectAttributes redirectAttributes,FileUploadBean uploadItem,
BindingResult result,HttpSession session){
//获取根路径
String uploadFolderPath = session.getServletContext().getRealPath("/");
ExtJSFormResult extjsFormResult = new ExtJSFormResult();
try {
if (result.hasErrors()) {
for (ObjectError error : result.getAllErrors()) {
System.err.println("Error: " + error.getCode() + " - "
+ error.getDefaultMessage());
}
// 设置ExtJS返回 - error
extjsFormResult.setSuccess(false);
return extjsFormResult.toString();
}
MultipartFile file = uploadItem.getFile();
String fileName = null;
InputStream inputStream = null;
OutputStream outputStream = null;
if(file.getSize()>0){
System.out.println("File Size:::" + file.getSize());
if(file.getSize()>5242880){
System.out.println("File Size:::" + file.getSize());
extjsFormResult.setSuccess(false);
return "error";
}
inputStream = file.getInputStream();
File newFile = new File(uploadFolderPath + "fileUpload/");
//如果文件路径不存在就新建一个
if(!newFile.exists()){
newFile.mkdirs();
}
//获取文件名
String name=file.getOriginalFilename();
//从数据库中查询存在此类文件名否
Long count=proAnnextDao.isRepeatName(name);
//如果存在一样的文件名,就进行从命名
if (count>0) {
name=name.substring(0, name.lastIndexOf("."))+"("+(countter++)+")"+name.substring(name.lastIndexOf("."));
}
fileName = uploadFolderPath + "fileUpload/" + name;
outputStream = new FileOutputStream(fileName);
int readBytes = 0;
byte[] buffer = new byte[10000];
while ((readBytes = inputStream.read(buffer, 0, 10000)) != -1) {
outputStream.write(buffer, 0, readBytes);
}
outputStream.close();
inputStream.close();
}
// 设置ExtJS返回 - sucsess
extjsFormResult.setSuccess(true);
} catch (Exception e) {
e.printStackTrace();
// 设置ExtJS返回 - error
extjsFormResult.setSuccess(false);
}
return extjsFormResult.toString();
}
}
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springMvc.xml（此文件名可能跟项目的实际情况有区别）中的配置:
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<!-- 上传文件,限制大小的配置 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--resolveLazily属性启用是为了推迟文件解析，以便在Upload中捕获文件大小异常-->
<property name="resolveLazily" value="true"/>
<property name="maxUploadSize" value="5242880" />
</bean>
<!-- 将无法mapping到Controller的path交给default servlet handler处理 -->
<mvc:default-servlet-handler/><!-- 使用默认的servlet来响应静态文件 -->
<!-- 文件的上传与下载 -->
<mvc:view-controller path="/" view-name="redirect:/fileUploadDown"/>
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以上的就是上传文件了。
那下载呢？
下载比较简单,代码如下：
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@RequestMapping("/downloadFile")
public void download(@Valid @ModelAttribute("downLoadName") String downLoadName,
HttpServletResponse response,HttpSession session,BindingResult result,HttpServletRequest request) throws IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
//获取文件的路径
String url=session.getServletContext().getRealPath("/")+"/fileUpload/"+downLoadName;
System.out.println(url);
File file=new File(url);
InputStream input = FileUtils.openInputStream(file);
byte[] data = IOUtils.toByteArray(input);
//System.out.println("文件名:"+downLoadName);
response.reset();
//设置响应的报头信息(中文问题解决办法)
response.setHeader("content-disposition","attachment;fileName="+URLEncoder.encode(downLoadName, "UTF-8"));
response.addHeader("Content-Length", "" + data.length);
response.setContentType("application/octet-stream; charset=UTF-8");
IOUtils.write(data, response.getOutputStream());
IOUtils.closeQuietly(input);
}
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在界面上只要有一个连接地址：如:window.location.href="根路径/fileUploadDown/downfile/downLoadName="+name;这样就可以下载了.... 超连接的写法基本一样,这里就不多说了.
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。