Struts学习之路-第二天（Action与Servlet API）
2021-06-04 11:04
阅读：460
YPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
标签：char instance filter string xmlns 4.0 tty turn 返回结果
Struts作为一款Web框架自然少不了与页面的交互，开发过程中我们最常用的request、application、session等struts都为我们进行了一定的封装与处理
一、通过ActionContext获取
| 方法 | 说明 |
| void put(String key,Object value) | 模拟HttpServletRequest中的setAttribute（） |
| Object get(Object key) | 通过参数key查找当前ActionContext中的值 |
| Map getApplication（） | 返回一个Application级的Map对象 |
| static ActionContext getContext（） | 获得当前线程的ActionContext对象 |
| Map getParameters() | 返回一个Map类型HttpSession对象 |
| void put（Object key，Object vlue） | 向前ActionContext对象中存入名值对信息 |
| void setApplication（Map application） | 设置Application上下文 |
| void setSession（Map session） | 设置一个Map类型的Session对象 |
| Map setSession() |
返回一个Map类型的HttpSession对象 |
1.配置web.xml
xml version="1.0" encoding="UTF-8"?> web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> filter> filter-name>struts2filter-name> filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilterfilter-class> filter> filter-mapping> filter-name>struts2filter-name> url-pattern>/*url-pattern> filter-mapping> web-app>
2.配置struts.xml
xml version="1.0" encoding="UTF-8"?> DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd"> struts> package name="test" extends="struts-default"> global-allowed-methods>userglobal-allowed-methods> action name="user" class="test.TestAction"> result name="success">/success.jspresult> result name="user">/user.jspresult> action> package> constant name="struts.enable.DynamicMethodInvocation" value="true">constant> constant name="struts.i18n.encoding" value="UTF-8">constant> struts>
3.在test包下写TestAction类
package test; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class TestAction extends ActionSupport{ private static final long serialVersionUID = 1L; //我们也可以通过实现特定接口来获取对应的对象比如ServletRequestAware可以获取到HttpServletRequest //的实例，但是我们需要手动定义该对象，通过接口中的重写的方法来初始化 public String execute(){ return "success"; } public String user(){ // struts通过Action访问servlet中的request、session、application等 ActionContext context = ActionContext.getContext(); context.put("name","request");//默认是request context.getSession().put("name","session");//session context.getApplication().put("name","application");//application return "user"; } }
4.准备页面index.jsp、user.jsp
1)index.jsp
Created by IntelliJ IDEA. po: zgye Date: 2019/5/11 Time: 12:27 To change this template use File | Settings | File Templates. --%>$Title$ user select
2)user.jsp
Created by IntelliJ IDEA. po: zgye Date: 2019/5/11 Time: 13:18 To change this template use File | Settings | File Templates. --%>用户页面 测试内置对象： ${requestScope.name} ${sessionScope.name} ${applicationScope.name}
5.启动服务点击select超链接测试
二、通过特定接口访问
ActionContext虽然可以间接的访问Servlet API，同时我们有时候也需要直接去访问Servlet API，Struts2为我们提供了对应的接口
1）ServletRequestAware
2）ServletResponseAware
3）ServletContextAware
·······
1.准备web.xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> struts2 class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter class>struts2 /*
2.配置struts,xml
DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
package name="test" extends="struts-default">
class="test.TestServletAction">
/servlet.jsp
3.准备TestServletAction.ava
package test; import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.interceptor.ServletResponseAware; import org.apache.struts2.util.ServletContextAware; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestServletAction extends ActionSupport implements ServletRequestAware, ServletResponseAware, ServletContextAware { private HttpServletRequest request; private HttpServletResponse response; private ServletContext context; @Override public void setServletRequest(javax.servlet.http.HttpServletRequest httpServletRequest) { request=httpServletRequest; } @Override public void setServletResponse(HttpServletResponse httpServletResponse) { response=httpServletResponse; } @Override public void setServletContext(ServletContext servletContext) { context=servletContext; } @Override public String execute() throws Exception { request.setAttribute("name","request"); request.setAttribute("response",response); context.setAttribute("name","context"); return "servlet"; } }
4.准备servlet.jsp页面
%--
Created by IntelliJ IDEA.
User: zgye
Date: 2019/5/12
Time: 12:27
To change this template use File | Settings | File Templates.
--%>
%@ page contentType="text/html;charset=UTF-8" language="java" %>
html>
head>
title>servlet测试页面title>
head>
body>
request:${requestScope.name}br>
response:${requestScope.response}br>
context:${applicationScope.name}
body>
html>
5.启动服务请求http://localhost:8080/servlet查看测试结果
Struts学习之路-第二天（Action与Servlet API）
标签：char instance filter string xmlns 4.0 tty turn 返回结果
原文地址：https://www.cnblogs.com/Tiandaochouqin1/p/10851871.html
文章来自：搜素材网的编程语言模块，转载请注明文章出处。
文章标题：Struts学习之路-第二天（Action与Servlet API）
文章链接：http://soscw.com/index.php/essay/90372.html
文章标题：Struts学习之路-第二天（Action与Servlet API）
文章链接：http://soscw.com/index.php/essay/90372.html
评论
亲，登录后才可以留言！