struts2的Action從頁面獲取傳遞的引數的三種方法
阿新 • • 發佈:2019-02-05
1.直接在Action中獲取頁面傳遞的引數
UserAction.java
struts.xml<span style="font-size:18px;">import java.util.Date; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport { private String username; private String password; private int age; private Date birthday; 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String register(){ System.out.println("UserAction register......"); System.out.println("username "+username); System.out.println("password "+password); System.out.println("age "+age); System.out.println("birthday "+birthday); return SUCCESS; } }</span>
index.jsp<span style="font-size:18px;"><?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="user_*" class="com.zucc.action.UserAction" method="{1}"> <result>index.jsp</result> </action> </package> </struts></span>
2.使用javaEeen進行封裝之後獲取頁面傳遞的引數<span style="font-size:18px;"><%@ 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>獲取表單</title> <style type="text/css"> input { font-family: Arial; } </style> </head> <body> <h1>獲取頁面引數</h1> <form action="user_register" method="post"> 帳號:<input type="text" name="username"/><br/> 密碼:<input type="password" name="password"/><br/> 年齡:<input type="text" name="age"/><br/> 生日:<input type="text" name="birthday"/><br/> <input type="submit" value="提交"/> </form> </body> </html></span>
User.java
<span style="font-size:18px;">import java.util.Date;
public class User {
private String username;
private String password;
private int age;
private Date birthday;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
</span>
Action.java<span style="font-size:18px;">import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String register(){
System.out.println("username "+user.getUsername());
System.out.println("password "+user.getPassword());
System.out.println("age "+user.getAge());
System.out.println("birthday "+user.getBirthday());
return SUCCESS;
}
}</span>
注意:不管有沒有初始化user,都必須要getUser方法。因為初始化user後會建立一個User的例項,會把頁面傳遞的引數通過getUser方法放到這個例項中;如果沒有初始化user,並沒有getUser方法方法,則每傳遞一個引數都會通過setUser建立一個User的例項,會導致引數丟失;如果沒有初始化user,並且有getUser方法方法,則傳遞第一個引數時會通過setUser建立一個User例項,之後傳遞的引數時getUser會獲取傳遞第一個引數時建立的User例項。
有初始化,有getUser方法
無初始化,有getUser方法
無初始化,無getUser方法
struts.xml
<span style="font-size:18px;"><?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="user_*" class="com.zucc.action.UserAction" method="{1}">
<result>index.jsp</result>
</action>
</package>
</struts></span>
index.jsp
<span style="font-size:18px;"><%@ 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>獲取表單</title>
<style type="text/css">
input {
font-family: Arial;
}
</style>
</head>
<body>
<h1>獲取頁面引數</h1>
<form action="user_register" method="post">
帳號:<input type="text" name="user.username"/><br/>
密碼:<input type="password" name="user.password"/><br/>
年齡:<input type="text" name="user.age"/><br/>
生日:<input type="text" name="user.birthday"/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html></span>
注意:input的name的屬性名一定要是"在Action中User的變數名.User中相應的變數名"
3.在第二種方法的基礎上使用ModelDriven介面
User.java和struts.xml與第二種方法的一樣
Action.java
<span style="font-size:18px;">import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class UserAction extends ActionSupport implements ModelDriven<User>{
private User user;
@Override
public User getModel() {
// TODO Auto-generated method stub
this.user = new User();
return this.user;
}
public String register(){
System.out.println("username "+user.getUsername());
System.out.println("password "+user.getPassword());
System.out.println("age "+user.getAge());
System.out.println("birthday "+user.getBirthday());
return SUCCESS;
}
}</span>
index.jsp<span style="font-size:18px;"><%@ 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>獲取表單</title>
<style type="text/css">
input {
font-family: Arial;
}
</style>
</head>
<body>
<h1>獲取頁面引數</h1>
<form action="user_register" method="post">
帳號:<input type="text" name="username"/><br/>
密碼:<input type="password" name="password"/><br/>
年齡:<input type="text" name="age"/><br/>
生日:<input type="text" name="birthday"/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html></span>
注意:input的name的屬性名直接是"User中相應的變數名"就行,因為ModelDriven介面會通過getModel()方法把頁面中傳遞的引數賦給user中,但是必須在getModel()方法中例項化user