此篇會提到要如何 收 / 送 資料
我們先來講要如何把頁面資料送至後端處理，方法：
1 . 用網頁標籤內的 name 來對應到 Action 內的 Value ( get / set )
2 . 用網頁標籤內的 name 來對應到 Action 內的 Bean ( get / set )
3 . 用網頁的表單方式統捆起來後 Action 實作 Module( form get/set )
簡單分析以上幾種方法
1 . 如果用第一種，之後 Action 一定看起來凌亂不堪，但初學好入手。
2 . 第二與第三差別在於頁面宣告的長度
以下我們就針對以上方法寫下範例：
1 . 用一般參數 set/get
仔細看 Action 部分，如果只有兩個參數還好，如果是十幾個？
整體偏程式碼都被 set /get 塞爆了
hello.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 皆可使用，二選一
<form action="hello" method="post" name="form">
姓名: <input type="text" name="userName" /><br/>
電話: <input type="text" name="userPhone" /><br/>
<input type="submit" value="提交"/><br/>
</form>
-->
<!-- struts 標籤 </form>
<form action="hello" method="post" name="form">
姓名: <s:textfield name="userName"/><br/>
電話: <s:textfield name="userPhone"/><br/>
<s:submit value="提交"/> <br/>
</form>
</body>
</html>
Action.java
說明：Jsp 的標籤名稱對應在 Action 內，並且設置 Set / Get
package com.brian.example.action;
public class HelloAction {
private String userName;
private String userPhone;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
.( userPhone set/get )
.
.
.
public String execute() {
System.out.println(getUserName() + "," + getUserPhone());
return "success";
}
}
2 . 用 Bean 來
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="hello" method="post">
姓名: <s:textfield name="user.userName"/><br/>
電話: <s:textfield name="user.userPhone"/><br/>
<s:submit value="提交"/> <br/>
</form>
</body>
</html>
User.java
說明：
package com.brian.example.action;
public class User {
private String userName;
private String userPhone;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPhone() {
return userPhone;
}
public void setUserPhone(String userPhone) {
this.userPhone = userPhone;
}
}
Action.java
說明：
package com.brian.example.action;
public class HelloAction {
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String execute() {
try {
if(user.getUserName() != null || user.getUserPhone() != null) {
System.out.println(user.getUserName() + " : " + user.getUserPhone() );
}
} catch (Exception e ) {
System.out.println(e.toString());
}
return "success";
}
}
3 . Module
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="hello" method="post" name="user">
姓名: <s:textfield name="userName"/><br/>
電話: <s:textfield name="userPhone"/><br/>
<s:submit value="提交"/> <br/>
</form>
</body>
</html>
User
同上方法 User.java
Action
package com.brian.example.action;
import com.opensymphony.xwork2.ModelDriven;
public class HelloAction implements ModelDriven<User> {
private User user = new User();
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public User getModel() {
return user;
}
public String execute() {
try {
if (user.getUserName() != null || user.getUserPhone() != null) {
System.out.println(user.getUserName() + " : " + user.getUserPhone());
}
} catch (Exception e) {
System.out.println(e.toString());
}
return "success";
}
}
參考資料：Struts2的三种传值方式比较(附demo)
參考資料：struts2 actions - Multiple Methods & Multiple classes
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