Struts2 拿到request session application的4种方法-优快云博客

本文介绍了四种不同的Struts2登录Action实现方式，包括直接使用ActionContext获取请求、会话和应用范围的数据，通过实现特定接口来注入这些数据，利用Servlet API手动获取相关信息，以及结合Struts2拦截器进行实现。

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1 第一种方法

public class LoginAction1 extends ActionSupport {

private Map request;
private Map session;
private Map application;

public LoginAction1() {
  System.out.println("hello");
  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;
}

}

第二种方法这种用的比较多

package com.bjsxt.struts2.user.action;

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

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {

private Map<String, Object> request;
private Map<String, Object> session;
private Map<String, Object> application;

//DI dependency injection
//IoC inverse of control
public String execute() {
  request.put("r1", "r1");
  session.put("s1", "s1");
  application.put("a1", "a1");
  return SUCCESS;
}

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

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

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

}

第三种方法

package com.bjsxt.struts2.user.action;

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 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", "r1");
  session.setAttribute("s1", "s1");
  application.setAttribute("a1", "a1");
  return SUCCESS;
}

}

第四种方法

package com.bjsxt.struts2.user.action;

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

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction4 extends ActionSupport implements ServletRequestAware {

private HttpServletRequest request;
private HttpSession session;
private ServletContext application;

public String execute() {
  request.setAttribute("r1", "r1");
  session.setAttribute("s1", "s1");
  application.setAttribute("a1", "a1");
  return SUCCESS;
}

@Override
public void setServletRequest(HttpServletRequest request) {
  this.request = request;
  this.session = request.getSession();
  this.application = session.getServletContext();
}

}

JSP

Struts.xml

<struts>
    <constant name="struts.devMode" value="true" />
    <package name="login" extends="struts-default" namespace="/login">
        <action name="login*" class="com.bjsxt.struts2.user.action.LoginAction{1}">
            <result>/user_login_success.jsp</result>
        </action>
    </package>
</struts>

Web.xml

<filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>