struts2如何获取Request-Session-ServletContext-Response

1. 访问和添加request/session/application属性

如果只是往request/session/application中设置属性，可以用下面的方式

Java代码 、

ActionContext ctx = ActionContext.getContext();

ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app

ctx.getSession().put("ses", "session范围");//往session里放入ses

ctx.put("req", "request范围");//往request里放入req

ctx.put("names", Arrays.asList("老张", "老黎", "老方"));

ActionContext ctx = ActionContext.getContext();
ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app
ctx.getSession().put("ses", "session范围");//往session里放入ses
ctx.put("req", "request范围");//往request里放入req
ctx.put("names", Arrays.asList("老张", "老黎", "老方"));

jsp页面上获取方式

Java代码

${applicationScope.app}<br>

${sessionScope.ses}<br>
${requestScope.req}<br>

${applicationScope.app}<br>
${sessionScope.ses}<br>
${requestScope.req}<br>

2. struts2中如何获取httpServletRequest/HttpSession/ServletContext/HttpServletResponse对象

方法一，通过ServletActionContext类获取：(推介使用)

Java代码

public String rsa() throws Exception{

HttpServletRequest request = ServletActionContext.getRequest();
ServletContext servletContext = ServletActionContext.getServletContext();
request.setAttribute("req", "请求范围属性");
request.getSession().setAttribute("ses", "会话范围属性");
servletContext.setAttribute("app", "应用范围属性");
HttpServletResponse response = ServletActionContext.getResponse();
return "message";
}

public String rsa() throws Exception{
HttpServletRequest request = ServletActionContext.getRequest();
ServletContext servletContext = ServletActionContext.getServletContext();
request.setAttribute("req", "请求范围属性");
request.getSession().setAttribute("ses", "会话范围属性");
servletContext.setAttribute("app", "应用范围属性");
HttpServletResponse response = ServletActionContext.getResponse();
return "message";
}

方法二，实现指定接口，由struts框架注入：

Java代码
import com.opensymphony.xwork2.ActionContext;

public class HelloWorldAction2 implements ServletContextAware,ServletRequestAware,ServletResponseAware{
private HttpServletRequest request ;
private HttpServletResponse response ;
private ServletContext servletContext ;
public void setServletContext(ServletContext context) {
//context对象不是应用程序传进去的，而是由struts框架自动注入的

this.servletContext = context ;
}
public void setServletRequest(HttpServletRequest request) {
this.request = request ;
}
public void setServletResponse(HttpServletResponse response) {
this.response = response ;
}
}