jQuery progressbar通过Ajax请求实现后台进度实时功能

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
/
@author: ZhengHaibo
web: http://blog.csdn.net/nuptboyzhb
mail: zhb931706659@126.com
Sep 13,2013 Nanjing,njupt,China
/
public class TestAction extends ActionSupport {
/**

• */
  private static final long serialVersionUID = -8697049781798812644L;
  /**
• 通过Ajax获取json格式的ProgressBar值
• Type：Action
  /
  public void getProgressValueByJson(){
  String progressValueString = getCookie(getRequest(),"progressValue");
  int progressValue = Integer.parseInt(progressValueString);
  if(progressValue>100){
  progressValue = 0;
  }
  System.out.println(" getCookie:---progressValue="+progressValue);
  writeJsonString("{"progressValue":"" + progressValue + ""}");
  progressValue += 2;
  setCookie(getResponse(),"progressValue",progressValue+"",365246060);
  }

/**

• Get HttpServletRequest Object
• @return HttpServletRequest
  */
  public HttpServletRequest getRequest(){
  return ServletActionContext.getRequest();
  }

/**

• Get HttpServletResponse Object
• @return HttpServletResponse
  */
  protected HttpServletResponse getResponse() {
  return ServletActionContext.getResponse();
  }

/**

• Get PrintWriter Object
• @return PrintWriter
• @throws IOException
  */
  protected PrintWriter getWriter() throws IOException {
  return this.getResponse().getWriter();
  }

/**

• 写Json格式字符串
• @param json
  */
  protected void writeJsonString(String json) {
  try {
  getResponse().setContentType("text/html;charset=UTF-8");
  this.getWriter().write(json);
  } catch (IOException e) {
  e.printStackTrace();
  }
  }

/**

• 获取cookie
• @param request
• @param name
• @return String
  */
  public static String getCookie(HttpServletRequest request,String name) {
  String value = null;
  try {
  for (Cookie c : request.getCookies()) {
  if (c.getName().equals(name)) {
  value = c.getValue();
  }
  }
  } catch (Exception e) {
  e.printStackTrace();
  }
  return value;
  }

/**

• 设置cookie
• @param response
• @param name
• @param value
• @param period
  */
  public static void setCookie(HttpServletResponse response,String name,String value,int period) {
  try {
  Cookie div = new Cookie(name,value);
  div.setMaxAge(period);
  response.addCookie(div);

} catch (Exception e) {
e.printStackTrace();
}
}
}