struts2中获取request/session/application
2011-09-05 02:23
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1。访问或添加request/session/application属性
将前一篇文件中的TestAction中的代码修改为如下所示:
Java代码
public class TestAction {
public String execute() {
ActionContext ctx = ActionContext.getContext();
ctx.getApplication().put("app", "应用范围");// 往ServletContext里放入app
ctx.getSession().put("ses", "session范围");// 往session里放入ses
ctx.put("req", "request范围");// 往request里放入req
return "success";
}
}
result.jsp中的代码修改为:
Java代码
<body>
${applicationScope.app} <br>
${sessionScope.ses}<br>
${requestScope.req}<br>
</body>
然后访问testAction,reault.jsp页面显示的内容为:
应用范围
session范围
request范围。
在上面的程序中也可以向request/session/application添加集合对象,然后使用jstl标签<c:forEach>在jsp页面迭代,就像使用servlet和jsp编程一样的方式。
2。获取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse对象
方式一、与Servlet解耦合的非IOC方式
获取的scope对象与容器无关,通过ActionContext获取。
Java代码
public class TestAction {
ActionContext context;
Map<String,Object> request;
Map<String,Object> session;
Map<String,Object> application;
@SuppressWarnings("unchecked")
public String execute() throws Exception {
context=ActionContext.getContext();
//request= (Map)context.get("request");
session=context.getSession();
application=context.getApplication();
context.put("req", "request范围");// 往request里放入req
//request.put("req", "requst属性");//或者使用这种方式
session.put("ses", "sesion属性");
application.put("app", "application属性");
return "success";
}
}
result.jsp中的代码修改为:
Java代码
${requestScope.req}
${sessionScope.ses}
${applicationScope.app}
<h4>以下使用scope.getAttribute的形式来接受</h4>
request: <%=request.getAttribute("req") %><br>
session: <%=session.getAttribute("ses") %><br>
application:<%=application.getAttribute("app") %><br>
页面访问显示结果为:
Html代码
requst属性 sesion属性 application属性
以下使用scope.getAttribute的形式来接受
request: requst属性
session: sesion属性
application:application属性
ActionContext中的部分源码如下所示:
Java代码
public class ActionContext implements Serializable{
Map<String, Object> context;
public ActionContext(Map<String, Object> context) {
this.context = context;
}
public void setApplication(Map<String, Object> application) {
put("com.opensymphony.xwork2.ActionContext.application", application);
}
public Map<String, Object> getApplication() {
return ((Map) get("com.opensymphony.xwork2.ActionContext.application"));
}
public void setSession(Map<String, Object> session) {
put("com.opensymphony.xwork2.ActionContext.session", session);
}
public Map<String, Object> getSession() {
return ((Map) get("com.opensymphony.xwork2.ActionContext.session"));
}
public Object get(String key) {
return this.context.get(key);
}
}
分析:通过ActionContext的getContext静态方法得到ActionContext对象,然后ActionContext对象调用get方法来获取一个存储在Map中的对象。
方式二、与Servlet解耦合的IOC方式
实现指定接口,由struts2框架运行时注入:(在struts2框架运行时会自动注入值)
Java代码
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
public class TestAction implements RequestAware,SessionAware,ApplicationAware {
Map<String, Object> request;
Map<String, Object> session;
Map<String, Object> application;
public String execute() throws Exception {
request.put("req", "requst属性");
session.put("ses", "sesion属性");
application.put("app", "application属性");
return "success";
}
public void setRequest(Map<String, Object> request) {
System.out.println("request:" + request.getClass().getName());
this.request=request;
}
public void setSession(Map<String, Object> session) {
System.out.println("session:" + session.getClass().getName());
this.session=session;
}
public void setApplication(Map<String, Object> application) {
System.out.println("application:" + application.getClass().getName());
this.application=application;
}
}
当访问testAction时,控制台打印出的信息如下所示:
Html代码
application:org.apache.struts2.dispatcher.ApplicationMap
session:org.apache.struts2.dispatcher.SessionMap
request:org.apache.struts2.dispatcher.RequestMa
RequestAware接口的源码如下所示:其他接口的源码类似。
Java代码
public interface RequestAware
{
public abstract void setRequest(Map<String, Object> paramMap);
}
方式三、与Servlet耦合的非IOC方式
通过ServletActionContext.类直接获取:
Java代码
public class TestAction {
HttpServletRequest request;
HttpSession session;
ServletContext application;
public String execute() throws Exception {
request = ServletActionContext.getRequest();
session = request.getSession();
application = ServletActionContext.getServletContext();
request.setAttribute("req", "requst属性");
session.setAttribute("ses", "sesion属性");
application.setAttribute("app", "application属性");
return "success";
}
}
方式四、与Servlet耦合的IOC方式
实现指定接口,由struts2框架运行时注入:(在struts2框架运行时会自动注入值)
Java代码
public class TestAction implements ServletRequestAware,ServletResponseAware,ServletContextAware{
private ActionContext context;
private HttpServletRequest request;
private HttpServletResponse response;
HttpSession session;
ServletContext application;
public String execute() throws Exception {
context=ActionContext.getContext();
session=request.getSession();
request.setAttribute("req", "requst属性");
session.setAttribute("ses", "sesion属性");
application.setAttribute("app", "application属性");
return "success";
}
public void setServletRequest(HttpServletRequest request) {
System.out.println("HttpServletRequest测试:"+request);
this.request=request;
}
public void setServletContext(ServletContext application) {
System.out.println("ServletContext测试:"+application);
this.application=application;
}
public void setServletResponse(HttpServletResponse response) {
System.out.println("HttpServletResponse测试:"+ response);
this.response=response;
}
}
在访问此action时,控制台打印的信息如下所示:
Html代码
HttpServletRequest测试:org.apache.struts2.dispatcher.StrutsRequestWrapper@1acfa31
HttpServletResponse测试:org.apache.catalina.connector.ResponseFacade@15dd910
ServletContext测试:org.apache.catalina.core.ApplicationContextFacade@47a0d4
ServletRequestAware的接口源码如下所示:
Java代码
public interface ServletRequestAware
{
public abstract void setServletRequest(HttpServletRequest paramHttpServletRequest);
}
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