struts2 向值栈中存放对象和List集合（第三种方式）

一、向值栈中放对象

1、实现步骤

• 定义对象变量
• 生成变量的get方法
• 在执行的方法里头向对象设置值

2、代码

User.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;
    }
        
}

ValuesStackAction3.java

package work.zhangdoudou.Action;

import com.opensymphony.xwork2.ActionSupport;
import work.zhangdoudou.Bean.User;

public class ValuesStackAction3 extends ActionSupport{
    //1定义对象变量
    private User user;
    //2生成个get方法
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
    @Override
    public String execute() throws Exception {
        //向值栈的user放对象
        user= new User();
        user.setUsername("zhangsan");
        user.setPassword("123");
        user.setType("student");
        
        return SUCCESS;
    }
}   

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="userAction3" class="work.zhangdoudou.Action.ValuesStackAction3" method="execute">
            <result name="success">/ValuesStack.jsp</result>
        </action>
    </package>
</struts>

web.xml

<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>struts2.217</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>

3、运行结果

image.png

二、向值栈中存放List集合

1、步骤

• 定义list集合的变量
• 生成get方法
• 在执行方法向list设置数据

2、代码

User.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;
    }
        
}

ValuesStackAction4.java

package work.zhangdoudou.Action;

import java.util.ArrayList;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;
import work.zhangdoudou.Bean.User;

public class ValuesStackAction4 extends ActionSupport{
    //1定义list变量
    private List<User> list;
    //2生成个get方法

    public List<User> getList() {
        return list;
    }

    public void setList(List<User> list) {
        this.list = list;
    }
    @Override
    public String execute() throws Exception {
        //向list存放数据
        User user1=new User();
        list=new ArrayList<User>();
        user1.setUsername("zhangsan");
        user1.setPassword("123");
        user1.setType("student");
        User user2=new User();
        user2.setUsername("lisi");
        user2.setPassword("456");
        user2.setType("student1");
        list.add(user1);
        list.add(user2);
        
        return SUCCESS;
    }
}

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="userAction4" class="work.zhangdoudou.Action.ValuesStackAction4" method="execute">
            <result name="success">/ValuesStack.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>struts2.217</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>

3、运行结果

image.png