Struts2封裝獲取表單資料方式
阿新 • • 發佈:2019-02-13
使用原始方式獲取表單到實體類物件
public class Form5DemoAction extends ActionSupport {
@Override
public String execute() throws Exception {
HttpServletRequest request=ServletActionContext.getRequest();
String username=request.getParameter("username");
String password=request.getParameter("password" );
String address=request.getParameter("address");
User user=new User();
user.setUsername(username);
user.setPassword(password);
user.setAddress(address);
System.out.println(user);
return NONE;
}
}
struts.xml中
<action name="form5" class="cn.itcast.form.Form5DemoAction"></action>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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="${pageContext.request.contextPath}/form5.action" method="post">
username:<input type="text" name="username"/>
<br/>
password:<input type="text" name="password"/>
<br/>
address:<input type="text" name="address"/>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
填寫jsp中的表單提交 控制檯打印出如下效果
屬性封裝
- 直接把表單提交屬性封裝到action的屬性裡面
- 實現步驟
- 在action成員變數位置 變數名稱和表單輸入項的name屬性值一樣
- 生成變數的set方法(set和get方法都寫出來)
- 用屬性封裝獲取表單資料到屬性裡面 不能把資料直接封裝到實體類物件裡面
public class Data1DemoAction extends ActionSupport {
private String username;
private String password;
private String address;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String execute() throws Exception {
System.out.println(username+" "+password+" "+address);
return NONE;
}
}
struts.xml
<action name="data1" class="cn.zhoushicanyin.date.Data1DemoAction"></action>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/data1.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"/>
</form>
</body>
</html>
填寫jsp中的表單提交 控制檯打印出如下效果
模型驅動封裝
- 使用模型驅動方式 可以直接把表單資料封裝到實體類物件裡面
- 實現步驟:
- action實現介面 ModelDriver
- 實現接口裡面的方法 getModel方法 把建立物件返回
- 在action裡面建立實體類物件
- 使用模型驅動和屬性封裝注意問題
- 在一個action中 獲取表單資料可以屬性封裝 也可以使用模型驅動 但不能同時使用屬性封裝和模型驅動封裝獲取同一個表單資料 如果同時使用 只會執行模型驅動
public class Data2DemoAction extends ActionSupport implements ModelDriven<User>{
private User user=new User();
private String username;
private String password;
private String address;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
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 getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public User getModel() {
return user;
}
@Override
public String execute() throws Exception {
System.out.println(user);//模型驅動封裝和屬性封裝同時進行用時 只會執行模型驅動封裝
System.out.println(username);
System.out.println(password);
System.out.println(address);
return NONE;
}
}
struts.xml
<action name="data2" class="cn.zhoushicanyin.date.Data2DemoAction"></action>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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="${pageContext.request.contextPath}/data2.action" method="post">
username:<input type="text" name="username"/>
<br/>
password:<input type="text" name="password"/>
<br/>
address:<input type="text" name="address"/>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
填寫jsp中的表單提交 控制檯打印出如下效果
表示式封裝
- 實現過程
- 在action裡面宣告實體類
- 生成實體類變數的set和get方法
- 在表單輸入項的name屬性值裡面寫表示式形式
- 把表示式封裝歸類到屬性封裝裡面
public class Data3DemoAction extends ActionSupport{
private User User;
private Book book;
public Book getBook() {
return book;
}
public void setBook(Book book) {
this.book = book;
}
public User getUser() {
return User;
}
public void setUser(User user) {
User = user;
}
@Override
public String execute() throws Exception {
System.out.println(book.getNbook());
System.out.println(User);
return NONE;
}
}
struts.xml
<action name="data3" class="cn.zhoushicanyin.date.Data3DemoAction"></action>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/data3.action" method="post">
username:<input type="text" name="user.username"/>
<br/>
password:<input type="text" name="user.password"/>
<br/>
address:<input type="text" name="user.address"/>
<br/>
nbook:<input type="text" name="book.nbook"/>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
填寫jsp中的表單提交 控制檯打印出如下效果
比較表示式封裝和模型驅動封裝
- 使用表示式封裝和模型驅動分支都可以把資料封裝到實體類物件裡面
- 在一個action裡面不能使用模型驅動把資料封裝到不同的實體類物件裡面
- 使用表示式封裝可以把資料封裝到不同的實體類物件裡面
END!!!!!!!!!