无法读取 request.getInputStream

Question

以下是我的操作类，

import java.io.InputStream;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.opensymphony.xwork2.ActionSupport;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

public class AccessRequest extends ActionSupport implements 
                  ServletRequestAware,ServletResponseAware {

  /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private HttpServletRequest request;
      private HttpServletResponse response;

     /**
     * @return the response
     */
    public HttpServletResponse getResponse() {
        return response;
    }

    /**
     * @param response the response to set
     */
    public void setResponse(HttpServletResponse response) {
        this.response = response;
    }

    /**
     * @return the request
     */
    public HttpServletRequest getRequest() {
        return request;
    }

    /**
     * @param request the request to set
     */
    public void setRequest(HttpServletRequest request) {
        this.request = request;
    }

    public void setServletRequest(HttpServletRequest request){
            this.request = request;
          }

          public HttpServletRequest getServletRequest(){
            return request;
          }

          public void setServletResponse(HttpServletResponse response){
            this.response = response;
          }

          public HttpServletResponse getServletResponse(){
            return response;
          }


  public String execute() throws Exception{
        request = ServletActionContext.getRequest();
        InputStream in = null;
        ServletInputStream si = request.getInputStream();
        System.out.println(si.available());//Getting 0
        System.out.println(request.getContentLength()); //Getting 938
        return SUCCESS;
  }

}

我得到 si.available() = 0，其中 request.getContentLength() 显示 938

为什么 struts 不读取 request.getInputstream??????

我在 Struts2 中使用 Servlet 时遇到同样的问题，

有什么想法吗？请帮忙

Answer 1

据我所知，

Struts 框架使用 getParameter 将数据填充到表单 bean 中
在调用execute方法之前，我们不能使用request.getInputStream，

请纠正我，如果它磨损了