Struts2 上传图片

上传工具：UploadFileUtils

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import javax.servlet.http.HttpServletRequest;

public class UploadFileUtils {
	//限制文件类型
	private static String[] fileTypes = {"image/bmp","image/png","image/gif","image/jpeg",
		"image/jpg","image/pjpeg","image/pjpg","image/x-png"};
	//限制文件大小
	private static long fileSize = 1024*1024L;
	
	/**
	 * 根据上传文件获取其真实读取路径
	 * @param request
	 * @param file
	 * @param fileName
	 * @param path
	 * @return
	 * @throws IOException
	 */
	public static String setUploadFile(HttpServletRequest request,File file,String fileName,String path) throws IOException{
		final Lock lock = new ReentrantLock();
		String newName = null;
		lock.lock();
		try {
			//加锁为防止文件名重复 
			newName = System.currentTimeMillis()
					+ fileName.substring(fileName.lastIndexOf("."),
							fileName.length());
		}finally {
			lock.unlock();
		}
		//------------ 锁结束 -------------
		//获取文件输出流 
		FileOutputStream fos = new FileOutputStream(request.getSession().getServletContext().getRealPath("/")+ path.replaceAll("/", "\\\\") + "\\" + newName);
		//设置 KE 中的图片文件地址 
		String newFileName = request.getScheme() + "://"
				+ request.getServerName() + ":" + request.getServerPort()
				+ request.getContextPath() + "/"+path+"/" + newName;
		byte[] buffer = new byte[1024];
		//获取内存中当前文件输入流 
		InputStream in = new FileInputStream(file);
		try {
			int num = 0;
			while ((num = in.read(buffer)) > 0) {
				fos.write(buffer, 0, num);
			}
		} catch (Exception e) {
			e.printStackTrace(System.err);
		} finally {
			in.close();
			fos.close();
		}
		return newFileName;
	}
	
	/**
	 * 验证文件类型是否为图片
	 * @param fileType
	 * @return
	 */
	public static boolean checkFileImg(String fileType){
		boolean flag = false;
		for(String type:fileTypes){
			if(type.equals(fileType))
				flag = true;
		}
		return flag;
	}
	
	/**
	 * 判断文件是否超长
	 * @param file
	 * @return
	 */
	public static boolean checkFileSize(File file){
		boolean flag = false;
		long size = file.length();
		if(size<=fileSize)
			flag = true;
		return flag;
	}
//	public static void main(String[] args) {
//		System.out.println("aa/bb/cc".replaceAll("/", "\\\\"));
//	}
}

对应的jsp中上传图片的form
注意form的enctype

<form action="<%=request.getContextPath()%>/modfiyHead.action" method="post" enctype="multipart/form-data">
      <a class="close"></a>
	  <strong>照片：<input type="file" name="headPicture" value=""/></strong>
	  <p>注意：严禁上传****等违法照片。为保证清晰度，建议图片尺寸为80x80。</p>
	  <p></p>
	  <p></p>
	  <p class="btn w1 c"><a onclick="$(this).up('form').submit();">上传</a></p>
	</form>

在action中，要定义三个属性，注意此三个属性，必须以jsp中的<input>的名称一致

	// 头像图片
	private File headPicture;
	private String headPictureContentType = "";
	private String headPictureFileName = "";

上传方法：

if(!UploadFileUtils.checkFileImg(headPictureContentType)){
				setRequestAttr("modfiyheadMSG", "图片类型错误。");
				return personalInt();
			}
			if(!UploadFileUtils.checkFileSize(headPicture)){
				setRequestAttr("modfiyheadMSG", "图片太大。");
				return personalInt();
			}
//调用上传工具上传图片
			String newFileName = UploadFileUtils.setUploadFile(getRequest(),
					headPicture, headPictureFileName,
					Constants.HEADPATH);
			ClubUser user = getSessionUser();
			user.setUimg(newFileName);
			userMng.update(user);