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 οnclick="$(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);