Struts2学习(二) get/set 自动获取/设置数据 ,ActionSupport 类引入,Action 设置数据
根据上一讲中的源码继续
HelloWorldAction.java中private String name,自动获取/设置name:
package com.cy.action; import com.opensymphony.xwork2.Action; public class HelloWorldAction implements Action{ private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public String execute() throws Exception { System.out.println("执行了Action的默认方法"); return SUCCESS; } }
helloWorld.jsp:
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> ${name }大爷你好! </body> </html>
1)使用get方式:
浏览器中访问:http://localhost:8080/Struts2Chap01/hello?name=Struts2
结果:
2)post方式:
编写index.jsp页面:
<body> <form action="hello" method="post"> name: <input type="text" name="name"/> <input type="submit" value="submit" /> </form> </body>
浏览器中访问:http://localhost:8080/Struts2Chap01/index.jsp,输入name:
点击submit:
二、ActionSupport 类引入 (一般用ActionSupport,因为功能比Action多)
HelloWorldAction2.java中继承ActionSupport:
package com.cy.action; import com.opensymphony.xwork2.ActionSupport; public class HelloWorldAction2 extends ActionSupport{ /** * */ private static final long serialVersionUID = 1L; private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public String execute() throws Exception { System.out.println("执行了HelloWorldAction2 Action的默认方法"); return SUCCESS; } }
三、Action 设置数据
第一种方式:属性驱动(FieldDriven) A、基本数据类型属性 B、JavaBean 类型属性
第二种方式:模型驱动(ModelDriven)
一般都用第一种方式,第二种方式在Action类中只能设置一个实体类的属性的值
基本数据类型属性实例分析
UserAction类
package com.java1234.action;
import com.java1234.model.User;
import com.java1234.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private UserService userService=new UserService();
private String userName;
private String password;
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;
}
@Override
public String execute() throws Exception {
System.out.println("执行了UserAction的默认方法");
User user=new User();
//userName和Password的值是通过post的方式提交过来的值,先通过set方法,然后通过get方法
user.setUserName(userName);
user.setPassword(password);
if(userService.login(user)){
return SUCCESS;
}else{
return ERROR;
}
}
}
UserService类
package com.java1234.service;
import com.java1234.model.User;
public class UserService {
public boolean login(User user){
if("java1234".equals(user.getUserName())&&"123456".equals(user.getPassword())){
return true;
}else{
return false;
}
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="helloWorld" extends="struts-default">
<action name="hello" class="com.java1234.action.HelloWorldAction2">
<result name="success">helloWorld.jsp</result>
</action>
<action name="user" class="com.java1234.action.UserAction">
<result name="success">success.jsp</result>
<result name="error">error.jsp</result>
</action>
<action name="user2" class="com.java1234.action.UserAction2">
<result name="success">success.jsp</result>
<result name="error">error.jsp</result>
</action>
<action name="user3" class="com.java1234.action.UserAction3">
<result name="success">success.jsp</result>
<result name="error">error.jsp</result>
</action>
</package>
</struts>
login.jsp
<%@ 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="user" method="post">
用户名:<input type="text" name="userName"/>
密码:<input type="text" name="password"/>
<input type="submit" value="登录"/>
</form>
</body>
</html>
success.jsp
<%@ 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>
登录成功!
</body>
</html>
error.jsp
<%@ 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>
登录失败!
</body>
</html>
浏览器访问http://localhost:8080/Struts2Chap01/login.jsp,输入cy,123456
登录成功:
B:javaBean类型属性驱动:
将上面的UserAction中改为private User user;javaBean的方式:
package com.cy.action; import com.cy.model.User; import com.cy.service.UserService; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport{ private static final long serialVersionUID = 1L; private UserService userService = new UserService(); private User user; public User getUser() { return user; } public void setUser(User user) { this.user = user; } public String execute() throws Exception { System.out.println("执行了UserAction Action的默认方法 采用javaBean"); if(userService.login(user)){ return SUCCESS; }else{ return ERROR; } } }
login.jsp登录界面需要修改为如下:
login2.jsp
<body> <form action="user" method="post"> 用户名: <input type="text" name="user.userName"/><br> 密码: <input type="password" name="user.password"/><br> <input type="submit" value="登录" /> </form> </body>
第二种:模型驱动:
UserAction.java: //主要实现ModelDriven<User>, private User user = new User(),这里要new一个user:
package com.cy.action; import com.cy.model.User; import com.cy.service.UserService; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.ModelDriven; public class UserAction extends ActionSupport implements ModelDriven<User>{ private static final long serialVersionUID = 1L; private UserService userService = new UserService(); private User user = new User(); public String execute() throws Exception { System.out.println("执行了UserAction Action的默认方法 采用模型驱动"); if(userService.login(user)){ return SUCCESS; }else{ return ERROR; } } public User getModel() { return user; } }
login3.jsp:
<body> <form action="user" method="post"> 用户名: <input type="text" name="userName"/><br> 密码: <input type="password" name="password"/><br> <input type="submit" value="登录" /> </form> </body>
ModelDriven的缺点是:只接受一个javaBean;