struts2的action中获得request response session -优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_13003/article/details/82275838

本文对比了Struts2中非IoC和IoC方式下获取Request、Session、Application对象的方法，包括非IoC直接使用ActionContext、实现特定接口由container设定对象，以及servlet相关的非IoC和IoC方式获取对象，提供了详细的代码示例。

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1，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


package struts2.login;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction  extends ActionSupport{
    private ActionContext context;
    private Map request;
    private Map session;
    private Map application;

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        this.context = ActionContext.getContext();
        this.request = (Map)this.context.get("request");
        this.session = this.context.getSession();
        this.application = this.context.getApplication();
        this.request.put("attribute", "request value servlet 不相关的 非IoC ");
        this.session.put("attribute", "session value servlet 不相关的 非IoC ");
        this.application.put("attribute", "application value servlet 不相关的非IoC ");
        return SUCCESS;
    }
}

2，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。请注意如下代码示例中红色文字的部分。


package struts2.login;

import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class Login2Action  extends ActionSupport
    implements RequestAware , SessionAware, ApplicationAware{
    private Map request;
    private Map session;
    private Map application;

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        this.request.put("attribute", "request value servlet 不相关的 IoC ");
        this.session.put("attribute", "session value servlet 不相关的 IoC ");
        this.application.put("attribute", "application value servlet 不相关的 IoC ");
        return SUCCESS;
    }

    @Override
    public void setRequest(Map<String, Object> arg0) {
        // TODO Auto-generated method stub
        this.request = arg0;
    }

    @Override
    public void setSession(Map<String, Object> arg0) {
        // TODO Auto-generated method stub
        this.session = arg0;
    }

    @Override
    public void setApplication(Map<String, Object> arg0) {
        // TODO Auto-generated method stub
        this.application = arg0;
    }
}

3，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。
取出方法，请参看代码中的蓝字部分。


package struts2.login;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class Login3Action  extends ActionSupport{
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        this.request = ServletActionContext.getRequest();
        this.session = this.request.getSession();
        this.application = ServletActionContext.getServletContext();
        this.request.setAttribute("attribute", "request value servlet 相关的非IoC ");
        this.session.setAttribute("attribute", "session value servlet 相关的非IoC ");
        this.application.setAttribute("attribute", "application value servlet 相关的 非IoC ");
        return SUCCESS;
    }

}

4，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，请参看代码中的红字部分。


package struts2.login;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

public class Login4Action  extends ActionSupport
    implements ServletRequestAware , ServletContextAware{
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        this.request.setAttribute("attribute", "request value servlet 相关的 IoC ");
        this.session = this.request.getSession();
        this.session.setAttribute("attribute", "session value servlet 相关的 IoC ");
        this.application.setAttribute("attribute", "application value servlet 相关的 IoC ");
        return SUCCESS;
    }

    @Override
    public void setServletRequest(HttpServletRequest arg0) {
        // TODO Auto-generated method stub
        this.request = arg0;
    }

    @Override
    public void setServletContext(ServletContext arg0) {
        // TODO Auto-generated method stub
        this.application = arg0;
    }
}

1、非IoC方式


HttpServletRequest request = ServletActionContext.getRequest();     HttpServletResponse response = ServletActionContext.getResponse();     
HttpSession session = request.getSession();

2、IoC方式（这种方式在tapestry中也是这样实现的）要使用IoC方式，我们首先要告诉IoC容器（Container）想取得某个对象的意愿，通过实现相应的接口做到这点。


public class IoCServlet extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {     private String message;     private Map att;     private HttpServletRequest request;     private HttpServletResponse response;

        public String getMessage() {     return message;     }

        publicvoid setSession(Map att) {     this.att = att;     }

        publicvoid setServletRequest(HttpServletRequest request) {     this.request = request;     }

        publicvoid setServletResponse(HttpServletResponse response) {     this.response = response;     }

        @Override     public String execute() {     att.put("msg", "Hello World from Session!");

        HttpSession session = request.getSession();

        StringBuffer sb =new StringBuffer("Message from request: ");     sb.append(request.getParameter("msg"));     sb.append("     Response Buffer Size: ");     sb.append(response.getBufferSize());     sb.append("     Session ID: ");     sb.append(session.getId());

        message = sb.toString();     return SUCCESS;     }     }