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Struts 2--Struts 2访问ServletAPI对象

2024-08-15 11:10:58   232人阅读

 

ServletAP解析：API(Application Programming Interface) 应用程序编程接口。

　　　ServletAPI就是和Servlet相关的一组接口和类。

　　为了能够实现对ServletAPI对象的访问，Struts 2 提供了多种方式，但归结起来可分为两大类：

　　1.与ServletAPI解耦的访问方式

　　2.与ServletAPI耦合的访问方式

下面介绍解耦方式：　　

1.使用ActionContex类获取ServletAPI对象对应的Map对象。

public class LoginAction implements Action {    private UserInfo user =new UserInfo();    @Override    public String execute() throws Exception {                if(user.getUserName().equals("admin") && user.getPassword().equals("admin")){                          Map<String, Object> session = ActionContext.getContext().getSession();             session.put("name", user.getUserName());            return "success";        }else{            return "error";        }    }    public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }}

2.向Action注入ServletAPI对象对应的Map对象

 

public class LoginAction implements Action,SessionAware {    private UserInfo user =new UserInfo();    private Map<String, Object> map;        @Override    public String execute() throws Exception {                if(user.getUserName().equals("admin") && user.getPassword().equals("admin")){                        map.put("name", user.getUserName());            return "success";        }else{            return "error";        }    }        //SessionAware实现方法    @Override    public void setSession(Map<String, Object> map) {        this.map=map;    }        public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }    public Map<String, Object> getMap() {        return map;    }    public void setMap(Map<String, Object> map) {        this.map = map;    }    }

 

 

 第三种：

public class LoginAction implements Action,ServletRequestAware {    private UserInfo user =new UserInfo();    private HttpServletRequest request;    @Override    public String execute() throws Exception {                if(user.getUserName().equals("admin") && user.getPassword().equals("admin")){                        request.setAttribute("name", user.getUserName());            return "success";        }else{            return "error";        }    }        //ServletRequestAware实现方法    @Override    public void setServletRequest(HttpServletRequest request) {        this.request=request;    }            public HttpServletRequest getRequest() {        return request;    }    public void setRequest(HttpServletRequest request) {        this.request = request;    }            public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }}

 

 

耦合方式：

第一种：

public class LoginAction implements Action {    private UserInfo user =new UserInfo();    @Override    public String execute() throws Exception {                if(user.getUserName().equals("admin") && user.getPassword().equals("admin")){                        HttpSession session = ServletActionContext.getRequest().getSession();            session.setAttribute("name", user.getUserName());            return "success";        }else{            return "error";        }    }    public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }  }

 

 第二种：

public class LoginAction implements Action {    private UserInfo user =new UserInfo();    @Override    public String execute() throws Exception {                if(user.getUserName().equals("admin") && user.getPassword().equals("admin")){                        Map<String, Object> session = ServletActionContext.getContext().getSession();            session.put("name", user.getUserName());            return "success";        }else{            return "error";        }    }    public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }    }

 

Struts 2--Struts 2访问ServletAPI对象


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