struts2直接访问Servlet Api(IoC方式)

た入场券 2022-05-25 14:14 224阅读 0赞

#### 【例】实现添加用户功能 ####

#### 第一步：**创建action类** ####

package com.dwx.actions;
    import javax.servlet.ServletContext;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    
    import org.apache.struts2.interceptor.ServletRequestAware;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    public class AddUserAction extends ActionSupport implements ServletRequestAware{
    	private String username;
    	private String password;
    	private String name;
    	private HttpServletRequest request;
    	private HttpSession session;
    	private ServletContext application;
    	@Override
    	public void setServletRequest(HttpServletRequest request) {
    		this.request=request;//获取request对象
    		this.session=request.getSession();//获取Session对象
    		this.application=session.getServletContext();//获取application对象
    	}
    	@Override
    	public String execute() throws Exception {
    		request.setAttribute("username", username);
    		session.setAttribute("password", password);
    		application.setAttribute("name", name);
    		return SUCCESS;
    	}
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    }

#### 第二步：配置struts.xml ####

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
    	<package name="user" extends="struts-default" namespace="/">
    		<action name="adduser" class="com.dwx.actions.AddUserAction">
    			<result name="success">/user_list.jsp</result>
    		</action>
    	</package>
    </struts>

#### 第三步：user\_add.jsp ####

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%@ taglib prefix="s" uri="/struts-tags"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>添加用户信息</title>
        
    	<meta http-equiv="pragma" content="no-cache">
    	<meta http-equiv="cache-control" content="no-cache">
    	<meta http-equiv="expires" content="0">    
    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    	<meta http-equiv="description" content="This is my page">
    	
    
      </head>
      
      <body>
      <center>
        <s:form action="adduser" method="post"> 
        	<s:textfield name="username" label="用户名"></s:textfield>
        	<s:password name="password" label="密码"></s:password>
        	<s:textfield name="name" label="真实姓名"></s:textfield>
        	<s:submit value="添加"></s:submit>
        </s:form>
      </center>
      </body>
    </html>

#### 第四步：user\_list.jsp ####

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>用户列表</title>
        
    	<meta http-equiv="pragma" content="no-cache">
    	<meta http-equiv="cache-control" content="no-cache">
    	<meta http-equiv="expires" content="0">    
    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    	<meta http-equiv="description" content="This is my page">
    	
    <style type="text/css">
    	table {
    		border-collapse:collapse;
    		text-align: center;
    }
    </style>
      </head>
      
      <body>
        <center>
        	<table cellpadding="0" cellspacing="0" width="30%" align="center" border="1">
        		<tr>
        			<th>用户名</th>
        			<th>密码</th>
        			<th>真实姓名</th>
        		</tr>
        		<tr>
        			<td><s:property value="#request.username" /></td>
        			<td><s:property value="#session.password" /></td>
        			<td><s:property value="#application.name" /></td>
        		</tr>
        	</table>
        </center>
      </body>
    </html>

#### 效果： ####

#### 添加用户 ####

![20180516092344175][]

#### 显示用户列表 ####

![20180516092405908][]

[20180516092344175]: /images/20220525/2027f11b9be5492c84e7d7b0fbb3012f.png
[20180516092405908]: /images/20220525/4da1111b63b241b890d3bd4c79e79ada.png