struts 文件上传示例

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.UUID;import org.apache.commons.io.FilenameUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class uploadAction extends ActionSupport {    private File uploadpic;    private String uploadpicContentType;    private String uploadpicFileName;    /**     * @return     */    public String execute() throws Exception  {        // TODO Auto-generated method stub        InputStream is = new FileInputStream(uploadpic);        String photoPath = ServletActionContext.getServletContext()                .getRealPath("/images");        File filePhotoPath = new File(photoPath);        if (!filePhotoPath.isDirectory()) {            filePhotoPath.mkdir();        }        String extension = FilenameUtils.getExtension(this.getUploadpicFileName());        String filename = UUID.randomUUID().toString() + "." + extension;        File tofile = new File(photoPath, filename);        OutputStream os = new FileOutputStream(tofile);        byte[] buffer = new byte[1024];        int length = 0;        while ((length = is.read(buffer)) > 0) {            os.write(buffer, 0, length);        }        is.close();        os.close();        return SUCCESS;    }    public File getUploadpic() {        return uploadpic;    }    public void setUploadpic(File uploadpic) {        this.uploadpic = uploadpic;    }    public String getUploadpicContentType() {        return uploadpicContentType;    }    public void setUploadpicContentType(String uploadpicContentType) {        this.uploadpicContentType = uploadpicContentType;    }    public String getUploadpicFileName() {        return uploadpicFileName;    }    public void setUploadpicFileName(String uploadpicFileName) {        this.uploadpicFileName = uploadpicFileName;    }}