Struts2访问Servlet

时间 2019-11-06

标签 struts2 struts 访问 servlet 栏目 Struts 繁體版

原文原文链接

知识点：html

servlet是单例的，Action是多例的，一次请求，建立一个Action的实例java

结果页面分为全局和局部两类（局部优先级更高）web

result标签：
name : 默认succes
type ：页面跳转类型
　　dispatcher 默认值，请求转发（action转发jsp）
　　redirect 重定向（action重定向jsp）
　　chain 转发（action转发action）
　　redirectAction 重定向（action重定向action）
　　stream struts2中提供文件下载的功能apache

代码以下微信

struts.xmlsession

<?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="demo1" extends="struts-default">
        <!--全局结果页面-->
        <global-results>
            <result name="success">servlet1/demo2.jsp</result>
        </global-results>
        <action name="requestDemo1" class="com.jinke.servlet1.RequestDemo1"/>
        <action name="requestDemo2" class="com.jinke.servlet1.RequestDemo2"/>
        <action name="requestDemo3" class="com.jinke.servlet1.RequestDemo3"/>

        <!--局部结果页面-->
        <action name="requestDemo1" class="com.jinke.servlet1.RequestDemo1">
            <result name="success">servlet1/demo2.jsp</result>
        </action>
        <action name="requestDemo2" class="com.jinke.servlet1.RequestDemo2">
            <result name="success">servlet1/demo2.jsp</result>
        </action>
        <action name="requestDemo3" class="com.jinke.servlet1.RequestDemo3">
            <result name="success">servlet1/demo2.jsp</result>
        </action>
    </package>
</struts>

web.xmlapp

<?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">
    <welcome-file-list>
        <welcome-file>servlet1/demo1.jsp</welcome-file>
    </welcome-file-list>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

demo1.jspjsp

<%-- Created by IntelliJ IDEA. User: wanglei Date: 2019/6/18 Time: 11:03 To change this template use File | Settings | File Templates. --%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>Struts2访问Servlet的API</h1>
<h3>方式一：完成解耦合的方式</h3>
<form action="${pageContext.request.contextPath}/requestDemo1.action" method="post"> 姓名：<input type="text" name="name"><br/> 密码：<input type="password" name="password"><br/>
    <input type="submit" value="提交"></form>

<h3>方式二：完成原生的方式访问</h3>
<form action="${pageContext.request.contextPath}/requestDemo2.action" method="post"> 姓名：<input type="text" name="name"><br/> 密码：<input type="password" name="password"><br/>
    <input type="submit" value="提交"></form>

<h3>方式三：接口注入的方式访问</h3>
<form action="${pageContext.request.contextPath}/requestDemo3.action" method="post"> 姓名：<input type="text" name="name"><br/> 密码：<input type="password" name="password"><br/>
    <input type="submit" value="提交"></form>

</body>
</html>

demo2.jspide

<%-- Created by IntelliJ IDEA. User: wanglei Date: 2019/6/18 Time: 11:24 To change this template use File | Settings | File Templates. --%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>显示数据</h1> ${reqName}<br/> ${sessName}<br/> ${appName}<br/>
</body>
</html>

action层post

import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.dispatcher.HttpParameters; /** * 访问Servlet的API方式一：彻底解耦合的方式 */
public class RequestDemo1 extends ActionSupport { @Override public String execute() throws Exception { //接收参数 //利用struts2中的对象ActionContext对象
        ActionContext context = ActionContext.getContext(); //调用ActionContext中方法
        HttpParameters map = context.getParameters(); // System.out.println(map); //二.向域对象中存入数据
        context.put("reqName", map);//至关于request.setAttribute()
        context.getSession().put("sessName", map);//至关于session.setAttribute()
        context.getApplication().put("appName", map);//至关于application.setAttribute()
        return SUCCESS; } }

import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.ServletActionContext; import javax.servlet.http.HttpServletRequest; import java.util.Map; /** * 访问Servlet的API方式二：采用原生的方式 */
public class RequestDemo2 extends ActionSupport { @Override public String execute() throws Exception { //1、接收数据 //直接得到request对象，经过ServletActionSupport
        HttpServletRequest request = ServletActionContext.getRequest(); Map<String, String[]> map = request.getParameterMap(); System.out.println(map.toString()); //2、向域对象中保存数据 //向request中保存数据
        request.setAttribute("reqName", map.toString()); //向session中保存数据
        request.getSession().setAttribute("sessName", map.toString()); //向application中保存数据
        ServletActionContext.getServletContext().setAttribute("appName", map.toString()); return SUCCESS; } }

import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.util.ServletContextAware; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import java.util.Arrays; import java.util.Map; /** * 访问Servlet的API方式三：接口注入的方式 */
public class RequestDemo3 extends ActionSupport implements ServletRequestAware, ServletContextAware { private HttpServletRequest request; private ServletContext context; @Override public String execute() throws Exception { //1、接收参数 //经过接口注入的方式得到request对象
        Map<String, String[]> map = request.getParameterMap(); for (String key : map.keySet()) { String[] value = map.get(key); System.out.println(key + "   " + Arrays.toString(value)); } //2、向域对象中保存数据 //向request域中保存数据
        request.setAttribute("reqName", map.toString()); //向session中保存数据
        request.getSession().setAttribute("sessName", map.toString()); //向Application中保存数据
        context.setAttribute("appName", map.toString()); return super.execute(); } @Override public void setServletRequest(HttpServletRequest httpServletRequest) { this.request = httpServletRequest; } @Override public void setServletContext(ServletContext servletContext) { this.context = servletContext; } }

结果

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