struts2怎么获取request
获得request对象有三种方式：
方式一：aware接口注入，即实现ServletRequestAware接口（此方式最为麻烦）
public class Demo2ServletAction extends ActionSupport implements ServletRequestAware{
private HttpServletRequest request;
@Override
public String execute() throws Exception {
request.setAttribute("gf", "request_aware");
return SUCCESS;
}
@Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
}
方式二：使用ServletActionContext工具类（此方式虽好，但与servlet api耦合）
public class Demo1ServletAction extends ActionSupport{
@Override
public String execute() throws Exception {
ServletActionContext.getRequest().setAttribute("gf", "request");
return SUCCESS;
}
}
方式三：通过ActionContext来获得（此方式与servlet api解耦，建议使用）
public class Demo3ServletAction extends ActionSupport{
@Override
public String execute() throws Exception {
ActionContext.getContext().put("gf", "request");
return SUCCESS;
}
}
获得request对象：
A．HttpServletRequest request = ServletActionContext.getRequest ();
B．ActionContext ct= ActionContext.getContext();
HttpServletRequest request = (HttpServletRequest)ct.get(
ServletActionContext.HTTP_REQUEST);
