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;
    }

}