struts之Action中获取request、response对象的方法

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struts之Action中获取request、response对象的方法

1、访问或添加request/session/application属性

public String scope() throws Exception{

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 "scope";

}

JSP:

<body>

${applicationScope.app}

${sessionScope.ses}

${requestScope.req}

</body>

2、获取HttpServletRequest/HttpSession/ServletContext/HttpServletResponse对象

方法一、通过ServletActionContext类直接获取：

public String rsa() throws Exception{

HttpServletRequest request = ServletActionContext.getRequest();

ServletContext servletContext = ServletActionContext.getServletContext();

request.getSession();

HttpServletResponse response = ServletActionContext.getResponse();

return "scope";

}

方法二、实现指定接口，由struts框架运行时注入：

public class HelloWorldAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{

private HttpServletRequest request;

private ServletContext servletContext;

private HttpServletResponse response;

public void setServletRequest(HttpServletRequest req) {

this.request=req;

}

public void setServletResponse(HttpServletResponse res) {

this.response=res;

}

public void setServletContext(ServletContext ser) {

this.servletContext=ser;

}

代码

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package com.ljq.action;import java.util.Arrays;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;public class HelloWorldAction { //在页面中采用以下el表达式输出 //第一种 //${applicationScope.app} //${sessionScope.ses} //${requestScope.req} //第二种 //${app} //${ses} //${req} public String list() { ActionContext ctx = ActionContext.getContext(); ctx.getApplication().put("app", "应用范围");// 往ServletContext里放入application ctx.getSession().put("ses", "session范围");// 往session里放入session ctx.put("req", "request范围");// 往request里放入request ctx.put("names", Arrays.asList("张三", "李四", "王五")); return "message"; } //在页面中采用以下el表达式输出 //第一种 //${applicationScope.app} //${sessionScope.ses} //${requestScope.req} //第二种 //${app} //${ses} //${req} public String get() throws Exception { HttpServletRequest request = ServletActionContext.getRequest(); ServletContext servletContext = ServletActionContext.getServletContext(); request.setAttribute("req", "请求范围属性"); request.getSession().setAttribute("ses", "会话范围属性"); servletContext.setAttribute("app", "应用范围属性"); // HttpServletResponse response = ServletActionContext.getResponse(); return "message";}} jsp代码${applicationScope.app} ${sessionScope.ses} ${requestScope.req} =========== ${app} ${ses} ${req} =========== <c:forEach items="${names}" var="name">${name } </c:forEach>

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