struts2访问web资源

Struts2访问web资源

有两种方式

• 和Servlet Api解耦的方式 只能访问有限的Servlet Api对象(读取请求参数，读取域对象属性，使用session等)
  • 使用ActionContext
  • 实现XxxAware
• 和Servlet Api耦合的方式，可以使用更多的Servlet Api对象，且可以调用原生方法
  • 使用ServletActionContext
  • 实现ServletXxxAware接口

解耦的方式

使用ActionContext

ActionContext actionContext = ActionContext.getContext();
// 获取application对应的map
Map<String,Object> application = actionContext.getApplication();
// 获取seesion对应的map
Map<String,Object> session = actionContext.getSession();
// 获取request对应的map
Map<String,Object> request = (Map<String, Object>) actionContext.get("reuqest");

使用XxxAware

public class TestAwareAction implements ApplicationAware, SessionAware, RequestAware {
    private Map<String,Object> application;

    private Map<String,Object> session;

    private Map<String,Object> request;
    @Override
    public void setApplication(Map<String, Object> application) {
        this.application = application;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }
}

耦合的方式

使用ServletActionContext

HttpSession session = ServletActionContext.getRequest().getSession();

HttpServletRequest request = ServletActionContext.getRequest();

HttpServletResponse response = ServletActionContext.getResponse();

使用ServletXxxAware

public class TestServletAwareAction implements ServletRequestAware, ServletResponseAware, ServletContextAware {

    private HttpServletResponse httpServletResponse;
    
    private HttpServletRequest httpServletRequest;
    
    private ServletContext servletContext;
    @Override
    public void setServletRequest(HttpServletRequest httpServletRequest) {
        this.httpServletRequest = httpServletRequest;
    }

    @Override
    public void setServletResponse(HttpServletResponse httpServletResponse) {
        this.httpServletResponse = httpServletResponse;
    }

    @Override
    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }
}