這篇文章主要講解了SpringMvc3+extjs4實(shí)現(xiàn)上傳與下載功能的代碼解析，內(nèi)容清晰明了，對(duì)此有興趣的小伙伴可以學(xué)習(xí)一下，相信大家閱讀完之后會(huì)有幫助。
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本文實(shí)例為大家分享了SpringMvc3+extjs4實(shí)現(xiàn)上傳與下載的具體代碼，供大家參考，具體內(nèi)容如下
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前臺(tái)代碼:
后臺(tái)代碼：
重慶分公司
重慶分公司
/**
*記錄返回結(jié)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;
}
}
/**
* 文件的上傳與下載
* @author Administrator
*
*/
@Controller
@RequestMapping(value = "/fileUploadDown")
public class FileUploadAndDownController {
private static int countter=1; //定義一個(gè)計(jì)數(shù)器,用于上傳文件的重命名
@Autowired
private ProAnnexDao proAnnextDao;
public void setProAnnextDao(ProAnnexDao proAnnextDao) {
this.proAnnextDao = proAnnextDao;
}
@RequestMapping(value="fileUpload",method = RequestMethod.POST)
public @ResponseBody String create(RedirectAttributes redirectAttributes,FileUploadBean uploadItem,
BindingResult result,HttpSession session){
//獲取根路徑
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());
}
// 設(shè)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/");
//如果文件路徑不存在就新建一個(gè)
if(!newFile.exists()){
newFile.mkdirs();
}
//獲取文件名
String name=file.getOriginalFilename();
//從數(shù)據(jù)庫中查詢存在此類文件名否
Long count=proAnnextDao.isRepeatName(name);
//如果存在一樣的文件名,就進(jìn)行從命名
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();
}
// 設(shè)置ExtJS返回 - sucsess
extjsFormResult.setSuccess(true);
} catch (Exception e) {
e.printStackTrace();
// 設(shè)置ExtJS返回 - error
extjsFormResult.setSuccess(false);
}
return extjsFormResult.toString();
}
} springMvc.xml（此文件名可能跟項(xiàng)目的實(shí)際情況有區(qū)別）中的配置:
