struts2的Action类中获得请求对象的四种方法

第一种形式:

public class LoginAction1 extends ActionSupport

{

 private Map request;

 private Map session;

 private Map application;

 

 public LoginAction1()

 {

  request = (Map)ActionContext.getContext().get("request");

  session = ActionContext.getContext().getSession();

  application = ActionContext.getContext().getApplication();

 }

 

 public String execute()

 {

  request.put("r1", "r1");

  session.put("s1", "s1");

  application.put("a1", "a1");

  return SUCCESS;

 }

}

 

第二种形式:

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware,ApplicationAware

{

 private Map<String,Object> request;

 private Map<String,Object> session;

 private Map<String,Object> application;

 

 public String execute()

 {

  request.put("r1", "r2");

  session.put("s1", "s2");

  application.put("a1", "a2");

  return SUCCESS;

 }

 @Override

 public void setRequest(Map<String, Object> request)

 {

  // TODO Auto-generated method stub

  this.request = request;

 }

 @Override

 public void setSession(Map<String, Object> session) {

  // TODO Auto-generated method stub

  this.session = session;

 }

 

 @Override

 public void setApplication(Map<String, Object> application) {

  // TODO Auto-generated method stub

  this.application = application;

 }

}

 

第三种形式:

public class LoginAction3 extends ActionSupport

{

 private HttpServletRequest request;

 private HttpSession session;

 private ServletContext application;

 

 public LoginAction3()

 {

  request = ServletActionContext.getRequest();

  session = request.getSession();

  application = session.getServletContext();

 }

 

 public String execute()

 {

  request.setAttribute("r1", "r3");

  session.setAttribute("s1", "s3");

  application.setAttribute("a1", "a3");

  return SUCCESS;

 }

}

第四种形式:

public class LoginAction4 extends ActionSupport implements ServletRequestAware

{

 private HttpServletRequest request;

 private HttpSession session;

 private ServletContext application;

 

 public String execute()

 {

  request.setAttribute("r1", "r4");

  session.setAttribute("s1", "s4");

  application.setAttribute("a1", "a4");

  return SUCCESS;

 }

 @Override

 public void setServletRequest(HttpServletRequest request)

 {

  // TODO Auto-generated method stub

  this.request = request;

  this.session = request.getSession();

  this.application = session.getServletContext();

 }

}

其中第二种方式最常用