struts2获取值封装到List和Map

一、封装数据到List

1、实现步骤

在action声明List
生成List变量的set和get方法
在表单输入项写表达式

2、实现代码

Userbean.java

package work.zhangdoudou.Bean;

public class User {
    private String username;
    private String password;
    private String type;
    
    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 getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }   
}

ListAction.java

package work.zhangdoudou.action;

import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
import work.zhangdoudou.Bean.User;

public class ListAction extends ActionSupport{
    private List<User> list;
    
    
    public List<User> getList() {
        return list;
    }

    public void setList(List<User> list) {
        this.list = list;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(list);
        return NONE;
    }
}

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>
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <package name="default" namespace="/" extends="struts-default">
        <action name="ListAction" class="work.zhangdoudou.action.ListAction" method="execute">
            <result name="none">/success.jsp</result>
        </action>   
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>struts2_ListAndMap</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP 'index.jsp' starting page</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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <div align="center">
        <h1>Login</h1>
        <form action="ListAction" method="post">
        <!-- list[0]代表第一个user对象 -->
            username:<input type="text" name="list[0].username"/><br/><br/>
            password:<input type="password" name="list[0].password"/><br/><br/>
            type:<input type="text" name="list[0].type"/><br/><br/>
            <hr>
            username:<input type="text" name="list[1].username"/><br/><br/>
            password:<input type="password" name="list[1].password"/><br/><br/>
            type:<input type="text" name="list[1].type"/><br/><br/>
            <input type="submit" value="Login"/>
        </form>
    </div>
  </body>
</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP 'success.jsp' starting page</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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <div align="center">
    ${list[0].username }
    ${list[0].password }
    ${list[0].type }
    <hr>
    ${list[1].username }
    ${list[1].password }
    ${list[1].type }
    </div>
  </body>
</html>

3、运行效果

image.png

一、封装数据到Map

1、实现步骤

在action声明Map
生成Map变量的set和get方法
在表单输入项写表达式

2、实现代码

Userbean.java

package work.zhangdoudou.Bean;

public class User {
    private String username;
    private String password;
    private String type;
    
    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 getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }   
}

MapAction.java

package work.zhangdoudou.action;

import java.util.Map;
import com.opensymphony.xwork2.ActionSupport;
import work.zhangdoudou.Bean.User;

public class MapAction extends ActionSupport{
    private Map<String, User> map;
    
    public Map<String, User> getMap() {
        return map;
    }
    public void setMap(Map<String, User> map) {
        this.map = map;
    }
    
    @Override
    public String execute() throws Exception {
        System.out.println(map);
        return NONE;
    }
}

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>
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <package name="default" namespace="/" extends="struts-default">
        <action name="MapAction" class="work.zhangdoudou.action.MapAction" method="execute">
            <result name="none">/success.jsp</result>
        </action>
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>struts2_ListAndMap</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP 'index.jsp' starting page</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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <div align="center">
        <h1>Login</h1>
        <form action="MapAction" method="post">
        <!-- list[0]代表第一个user对象 -->
            username:<input type="text" name="map['one'].username"/><br/><br/>
            password:<input type="password" name="map['one'].password"/><br/><br/>
            type:<input type="text" name="map['one'].type"/><br/><br/>
            <hr>
            username:<input type="text" name="map['two'].username"/><br/><br/>
            password:<input type="password" name="map['two'].password"/><br/><br/>
            type:<input type="text" name="map['two'].type"/><br/><br/>
            <input type="submit" value="Login"/>
        </form>
    </div>
  </body>
</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP 'success.jsp' starting page</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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <div align="center">
    ${map['one'].username }
    ${map['one'].password }
    ${map['one'].type }
    <hr>
    ${map['two'].username }
    ${map['two'].password }
    ${map['two'].type }
    </div>
  </body>
</html>

三、运行效果

image.png

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struts2获取值封装到List和Map

一、封装数据到List

1、实现步骤

2、实现代码

3、运行效果

一、封装数据到Map

1、实现步骤

2、实现代码

三、运行效果

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