Struts2 Action后台获取表单数据三种方法

小咪咪 2021-10-13 01:53 326阅读 0赞

在学习使用struts的过程中自己也是实际用idea操作Action后台获取表单数据三种方式，这里记录一下。

### 一、使用ActionContext类获取（系统推荐）： ###

jsp页面代码：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
      <title>$Title$</title>
    </head>
    <body>
    <form action="${pageContext.request.contextPath}/form1.action" method="post">
      username:<input type="text" name="username"/><br/>
      password:<input type="text" name="password"/><br/>
      address:<input type="text" name="address"/><br/>
      <input type="submit" value="提交"/><br/>
    </form>
    </body>
    </html>

页面样式：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70][]

struts.xml配置：

<?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" namespace="/">
            //下面三个action标签配置分别对应三个测试的后台测试类的action路径
            <action name="form1" class="action.Form1DemoAction"></action>
            <action name="form2" class="action.Form2DemoAction"></action>
            <action name="form3" class="action.Form3DemoAction"></action>
        </package>
    </struts>

后台方法一代码：

public class Form1DemoAction extends ActionSupport {
        @Override
        public String execute() throws Exception {
            //获取ActionContext对象
            ActionContext context = ActionContext.getContext();
            //调用方法得到表单数据
            HttpParameters map = context.getParameters();
    
            Set<String> keys = map.keySet();
            for (String key:keys) {
                //根据key得到vlaue
                Parameter obj = map.get(key);
                System.out.println(Arrays.toString(new Parameter[]{obj}));
            }
            return NONE;
        }
    }

### 二、使用ServletActionContext类获取（实际常用） ###

jsp和其他配置文件与方法1一样即可，这里不再重复。

后台代码：

public class Form2DemoAction extends ActionSupport {
        @Override
        public String execute() throws Exception {
            //使用ServletActionContext获取request对象
            HttpServletRequest request = ServletActionContext.getRequest();
            //调用request里面的方法得到结果
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            String address = request.getParameter("address");
            System.out.println(username+".."+password+".."+address);
            return NONE;
        }
    }

### 三、使用接口注入（了解）  ###

jsp和其他配置文件与方法1一样即可，这里不再重复。

后台代码：

public class Form3DemoAction extends ActionSupport implements ServletRequestAware {
        private  HttpServletRequest request;
        @Override
        public void setServletRequest(HttpServletRequest httpServletRequest) {
            this.request = httpServletRequest;
        }
    
        @Override
        public String execute() throws Exception {
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            String address = request.getParameter("address");
            System.out.println(username+".."+password+".."+address);
            return NONE;
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70]: /images/20211013/5c0dbe4dbcb74e7d98124c8de870327f.png