单个图片上传

jsp页面

<form method="post" name="myForm" action="saveUserEditInfo.w" id="userForm1" enctype="multipart/form-data">

<input type="file" name="image" id="aaa" />

</form>

java后台

// 封装上传文件域的属性
private File image;
// 封装上传文件类型的属性
private String imageContentType;
// 封装上传文件名的属性
private String imageFileName;
// 接受依赖注入的属性
private String savePath;

//图片上传方法

public void uploadPic(){FileOutputStream fos = null;FileInputStream fis = null;if (null != image) {try {// 建立文件上传流fis = new FileInputStream(image);                        //获得项目路径ServletContext  application  = session.getServletContext();    String serverRealPath = application.getRealPath("") ;//获得当前时间String sDatePath = sDatePath = DateUtil.format(new Date(), "yyyy/MM/dd");//定义大中小图上传路径String dir = serverRealPath+Constant.uploadUserUrl+"/"+sDatePath;String dirMedium = serverRealPath+Constant.mediumUserUrl+"/"+sDatePath;String dirSmall = serverRealPath+Constant.smallUserUrl+"/"+sDatePath;// 判断文件夹是否存在，如果不存在就创建//System.out.println("dir=="+dir);findFolderIsExit(dir);//System.out.println("dirMedium=="+dirMedium);findFolderIsExit(dirMedium);//System.out.println("dirSmall=="+dirSmall);findFolderIsExit(dirSmall);String[] data = imageFileName().split("\\.");String houzhui = data[data.length - 1];//文件新名称String fileName = CommonUtil.getExchangeCode() + "." + houzhui;// String fileName = imageFileName;File uploadFile = new File(dir, fileName);// 建立文件输出流fos = new FileOutputStream(uploadFile);byte[] buffer = new byte[1024];int len = 0;while ((len = fis.read(buffer)) > 0) {fos.write(buffer, 0, len);}} catch (IOException e) {e.printStackTrace();}catch (Exception e) {System.out.println("文件上传失败");e.printStackTrace();} finally {close(fos, fis);}}}

//判断文件夹是否存在,如果不存在则创建文件夹

public static void findFolderIsExit(String path){
File file = new File(path);  
   if (!file.exists()) {
file.mkdirs();  
}
}

/**
* 兑换编号
* 规则：日期+四位随机数
* 20130413+1234
* @return
*/
public static String getExchangeCode(){

Date date = new Date();
SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
String da = format.format(date);
Set<Integer> set = GetRandomNumber();
// 使用迭代器
Iterator<Integer> iterator = set.iterator();
// 临时记录数据
String temp = "";
while (iterator.hasNext()) {
temp += iterator.next();
}
return da+temp;
}