Struts2封装获取表单数据方式

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我是靠谱客的博主务实滑板，最近开发中收集的这篇文章主要介绍Struts2封装获取表单数据方式，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

一.属性封装
1.创建User实体类`

package cn.entity;
public class User {
private String username;
private String password;
@Override
public String toString() {
return "User{" +
"username='" + username + ''' +
", password='" + password + ''' +
'}';
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}

2.创建DataDemo2Action类将数据封装到实体类


User user=new User();
user.setUsername(username);
user.setPassword(password);
System.out.println(user);

或者通过以下方式

package cn.data;
import cn.entity.User;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用属性封装表单数据
* @author zhangshuaihao
*/
public class DateDemo1Action extends ActionSupport {
//1.定义变量
//2.变量的名称要和输入项name相同
private String username;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
//2.生成get和set方法
@Override
public String execute() throws Exception {
System.out.println("username="+username);
System.out.println("password="+password);
return NONE;
}
}

通过structs2内部机制，先获取表单中的name属性值，然后与该类中的属性(username/password)进行匹配，如果匹配成功，则会调用set方法，将其封装到实体类对象中

二、模型驱动
1.创建User实体类

package cn.entity;
public class User {
private String username;
private String password;
@Override
public String toString() {
return "User{" +
"username='" + username + ''' +
", password='" + password + ''' +
'}';
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}

import cn.entity.User;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
/**
* 使用属模型驱动获取表单数据
* 模型驱动能够直接把表单数据封装到实体类对象中去
* @author zhangshuaihao
*/
public class DateDemo2Action extends ActionSupport implements ModelDriven<User> {
//创建对象
//创建要求，要求表单输入项中的name属性值和实体类属性名称一致
private User user=new User();
@Override
public String execute() throws Exception {
System.out.println(user);
return NONE;
}
@Override
public User getModel() {
//返回创建的对象
return user;
}
}

该模型驱动要实现ModelDriven接口，并且实现其中的getModel()方法，可以直接将属性封装到实体类中
三、表达式封装

在这里插入代码片<form action="${pageContext.request.contextPath}/data3.action" method="post">
username:<input name="user.username" type="text" id="username"><br>
password:<input name="user.password" type="password" id="password"><br>
<input type="submit" name="Submit" value="提交">
</form>

import cn.entity.User;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
/**
* 使用表达式封装数据
*
* @author zhangshuaihao
*/
public class DateDemo3Action extends ActionSupport {
//1.声明实体类
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public String execute() throws Exception {
System.out.println(user);
return NONE;
}
}