01_12_Struts2_访问Web元素

1. 配置struts.xml文件

/user_login_success.jsp

</result>

</action>

</package>

2. 配置jsp页面

user_login.jsp

<body>

取得Map类型request、session、application,真实类型HttpServletRequest、HttpServletSession、ServletContext的引用

<ol>

<li>

前三者：依赖于容器

</li>

<li>

前三者：IOC

</li>

<li>

后三者：依赖于容器

</li>

<li>

后三者：IOC

</li>

</ol>

用户名：<input type="text" name="name" />

密码：<input type="text" name="password" />

<br/>

</form>

</body>

user_login_success.jsp

<body>

<s:property value="#request.r1" />

<%=request.getAttribute("r1")%>

<br />

<s:property value="#session.s1" />

<%=session.getAttribute("s1")%>

<br />

<s:property value="#application.a1" />

<%=application.getAttribute("a1")%>

<br />

<s:debug></s:debug>

</body>

3. 实现Action类

3.1LoginAction1.java

package com.sumapay.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends ActionSupport{

private String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

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() {

System.out.println("調用execute方法");

System.out.println("##############");

System.out.println(name);

request.put("r1", "r1");

session.put("s1", "s1");

application.put("a1", "a1");

return "success";

}

3.2LoginAction2.java

package com.sumapay.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.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 setApplication(Map<String, Object> application) {

this.application = application;

}

@Override

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

this.session = session;

}

@Override

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

this.request = request;

}

3.3LoginAction3.java

package com.sumapay.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();

}

//DI dependency injection

//Ioc inverse of control

public String execute() {

request.setAttribute("r1", "r1");

session.setAttribute("s1", "s1");

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

return "success";

}

3.4LoginAction4.java

package com.sumapay.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();

}

//DI dependency injection

//Ioc inverse of control

public String execute() {

request.setAttribute("r1", "r1");

session.setAttribute("s1", "s1");

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

return "success";

}