版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u011301372/article/details/85008608
完全解耦合方式（ActionContext）
<!--demo1.jsp-->
<h3>演示Servlet的API的第一种方式（完全解耦合方式）</h3>
<form action = "${pageContext.request.contextPath}/demo1Action.action" method="post">
姓名：<input type="text" name="username"/><br/>
密码：<input type="password" name="password"/><br/>
<input type="submit" value="注册">
</form>
public class Demo1Action extends ActionSupport {
public String execute() throws Exception{
//完全解耦合的方式
ActionContext context =ActionContext.getContext();
//获取请求的参数，封装所有请求的参数
Map<String, Object> map = context.getParameters();
//遍历获取数据
Set<String> keys = map.keySet();
for(String key:keys){
//通过key获取值
String[] vals = (String[])map.get(key);
System.out.println(key +":"+ Arrays.toString(vals));
}
//向request对象中存入值
context.put("msg","小董");
//获取其他的map集合
context.getSession().put("msg","小忙");
context.getApplication().put("msg","小猪");
return SUCCESS;
}
}
<package name="demo1" extends="struts-default" namespace="/">
<action name="demo1Action" class="com.zst.demo1.Demo1Action" >
<result name="success">/demo1/suc.jsp</result>
</action>
</package>
<!--suc.jsp-->
<body>
<h3>使用EL表达式获取值</h3>
${requestScope.msg}
${sessionScope.msg}
${applicationScope.msg}
</body>
原生方式(ServletActionContext)
<h3>使用ServletActionContext类方法</h3>
<form action = "${pageContext.request.contextPath}/demo2Action.action" method="post">
姓名：<input type="text" name="username"/><br/>
密码：<input type="password" name="password"/><br/>
<input type="submit" value="注册">
</form>
public class Demo2Action extends ActionSupport {
public String execute() throws Exception{
//获取到request对象
HttpServletRequest request = ServletActionContext.getRequest();
request.setAttribute("msg","小碗");
request.getSession().setAttribute("msg","下坡");
ServletActionContext.getServletContext().setAttribute("msg","小风");
HttpServletResponse response = ServletActionContext.getResponse();
//使用输出流，输出内容
return SUCCESS;
}
}
<!--原生的方式-->
<action name="demo2Action" class="com.zst.demo1.Demo2Action" >
<result name="success" >/demo1/suc.jsp</result>
</action>