Struts 前台值传后台的三种方式

拼搏现实的明天。 2022-05-29 08:25 211阅读 0赞

属性驱动：   
1、在action中定义很多页面需要的属性及其对应的getter，setter方法。   
2、前台取值写对应的属性名称

——————明显不可取，不做解释。

模型驱动：   
1、在action中定义实体，实现 ModelDriven接口，实现getModel()方法。   
2、前台取值写对应的属性名称

——————合理。

其实还有一种，介于两者之间。   
1、在action中定义实体，写getter，setter方法。   
2、前台取值写：实体.属性名称。

下面分别是三种方式的演示：   
实体类如下：

public class User {
        private int id;
        private String username;
        private String password;
        private int age;
        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 int getAge() {
           return age;
        }
        public void setAge(int age) {
           this.age = age;
        }
        public String getAddress() {
           return address;
        }
        public void setAddress(String address) {
           this.address = address;
        }
        public int getId() {
           return id;
        }
        public void setId(int id) {
           this.id = id;
        }
    }

--------------------

第一种：

public class UserAction {
        private int id;
        private String username;
        private String password;
        private int age;
        private String address;
    
        public String add(){
    
           User user = new User();
           user.setId(id);
           user.setUsername(username);
           user.setPassword(password);
           user.setAge(age);
           user.setAddress(address);
    
           new UserManager().addUser(user);
    
           return "success";
        }
    
        public int getId() {
           return id;
        }
        public void setId(int id) {
           this.id = id;
        }
        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 String getAddress() {
           return address;
        }
        public void setAddress(String address) {
           this.address = address;
        }
    }

JSP中写法

<form action="test/user.action" method="post">
            <input type="hidden" name="method:add">
            username:<input type="text" name="username"> <br/>
            password:<input type="text" name="password"> <br/>
            age:<input type="text" name="age"> <br/>
            address:<input type="text" name="address"> <br/>
            <input type="submit" name="submit" value="添加用户">
    </form> <br/>

第二种:

public class UserAction implements ModelDriven{ 
    
        private User user;
    
        @Override
        public Object getModel() {
           if(user == null){
               user = new User();
           }
           return user;
        }
    
        public String add(){
    
           new UserManager().addUser(user);
    
           return "success";
        }
    }

jsp 中写法

<form action="test/user.action" method="post">
            <input type="hidden" name="method:add">
            username:<input type="text" name="username"> <br/>
            password:<input type="text" name="password"> <br/>
            age:<input type="text" name="age"> <br/>
            <input type="submit" name="submit" value="添加用户">
    </form> <br/>

--------------------

第三种：

public class UserAction {
    
        private User user;
    
        public String add(){
    
           new UserManager().addUser(user);
    
           return "success";
        }
    
        public User getUser() {
           return user;
        }
    
        public void setUser(User user) {
           this.user = user;
        }
    }

JSP中写法：

<form action="test/user.action" method="post">
            <input type="hidden" name="method:add">
            username:<input type="text" name="user.username"> <br/>
            password:<input type="text" name="user.password"> <br/>
            age:<input type="text" name="user.age"> <br/>
            address:<input type="text" name="user.address"> <br/>
            <input type="submit" name="submit" value="添加用户">
    </form> <br/>