Strtus2——request、response等内置对象的获取方式

来源：互联网发布：access与sql的区别编辑：程序博客网时间：2024/05/16 22:08

【注意】：我们需要知道后两种方法得到的是Map<String,Object>,而后两种方式得到的才是真正的request等对象。而Map就是把request对象中的属性取出做成了键值对而已。

方法一：使用ServletActionContext获取——servlet 相关的非IoC 取得Request等对象的方式——这种方法可以获取servlet相关的request等对象，也就是说这种方式取出的request对象不单单是设定属性的作用，而是可以获取http相关的信息

public class StudentAction extends ActionSupport implements ModelDriven<Student> {private Student student;private HttpServletRequest request;private HttpServletResponse response;private ServletContext application;private HttpSession session;public StudentAction(){request=ServletActionContext.getRequest();response=ServletActionContext.getResponse();session=request.getSession();application=session.getServletContext();}public String execute(){request.setAttribute("student", student);session.setAttribute("student", student);application.setAttribute("student", student);return Action.SUCCESS;}@Overridepublic Student getModel() {student=new Student();return student;}}

方法二：实现ServletRequestAware，ServletResponseAware接口——servlet 相关的 IoC 取得Request等对象的方式——这种方法也可以获取servlet相关的request等对象，也就是说这种方式取出的request对象不单单是设定属性的作用，而是可以获取http相关的信息。
但是取出方法是通过接口进行实现，也就是由struts2的container来设定

public class StudentAction2 extends ActionSupport implements ModelDriven<Student>,ServletRequestAware,ServletResponseAware {private Student student;private HttpServletRequest request;private HttpServletResponse response;private ServletContext application;private HttpSession session;public String execute(){request.setAttribute("student", student);session.setAttribute("student", student);application.setAttribute("student", student);return Action.SUCCESS;}@Overridepublic Student getModel() {student=new Student();return student;}@Overridepublic void setServletResponse(HttpServletResponse arg0) {this.response=arg0;}@Overridepublic void setServletRequest(HttpServletRequest arg0) {this.request=arg0;session=this.request.getSession();application=session.getServletContext();}}

方法三：Map键值对方式，通过ActionContext获得——servlet 不相关的非IoC 取得Request等对象的方式——这种方法先取得ActionContext，然后获取Map类型的request等对象

public class StudentAction3 extends ActionSupport implements ModelDriven<Student> {private Student student;private Map<String,Object> request;private Map<String,Object> session;private Map<String,Object> application;public StudentAction3(){request=(Map<String, Object>) ActionContext.getContext().get("request");session=ActionContext.getContext().getSession();application=ActionContext.getContext().getApplication();}public String execute(){request.put("student", student);session.put("student", student);application.put("student", student);return Action.SUCCESS;}@Overridepublic Student getModel() {student=new Student();return student;}}

方法四：继承RequestAware,SessionAware,ApplicationAware接口——servlet 不相关的 IoC 取得Request等对象的方式——这种方法，是实现特定的接口，由container来设定request等对象

public class StudentAction4 extends ActionSupport implements ModelDriven<Student>,RequestAware,SessionAware,ApplicationAware {private Student student;private Map<String,Object> request;private Map<String,Object> session;private Map<String,Object> application;public String execute(){request.put("student", student);session.put("student", student);application.put("student", student);return Action.SUCCESS;}@Overridepublic Student getModel() {student=new Student();return student;}@Overridepublic void setApplication(Map<String, Object> arg0) {application=arg0;}@Overridepublic void setSession(Map<String, Object> arg0) {session=arg0;}@Overridepublic void setRequest(Map<String, Object> arg0) {request=arg0;}}

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