无涯教程-Java 传输对象模式当无涯教程想要一次将多个属性的数据从客户端传递到服务器时，使用"传输对象"模式。转移对

当无涯教程想要一次将多个属性的数据从客户端传递到服务器时，使用"传输对象"模式。转移对象也称为值对象。传输对象是具有getter/setter方法的简单POJO类，并且可序列化，因此可以通过网络进行传输，以下是这种设计模式的实体。

业务对象(Business Object) - 业务服务用数据填充传输对象。
传输对象(Transfer Object) - 简单的POJO，仅具有set/get属性的方法。
客户端(Client) - 客户端请求或将传输对象发送到业务对象。

传输对象设计模式实例

将创建一个 StudentBO 作为业务对象， Student 作为表示实体的传输对象。

演示类 TransferObjectPatternDemo 在这里充当客户端，将使用 StudentBO 和 Student 演示传输对象设计模式。

第1步 - 创建传输对象。

StudentVO.java

public class StudentVO {
   private String name;
   private int rollNo;
StudentVO(String name, int rollNo){
this.name = name;
this.rollNo = rollNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getRollNo() {
return rollNo;
}
public void setRollNo(int rollNo) {
this.rollNo = rollNo;
}
}

第2步 - 创建业务对象。

StudentBO.java

import java.util.ArrayList;
import java.util.List;
public class StudentBO {
//list is working as a database
List<StudentVO> students;
public StudentBO(){
students = new ArrayList<StudentVO>();
StudentVO student1 = new StudentVO("Robert",0);
StudentVO student2 = new StudentVO("John",1);
students.add(student1);
students.add(student2);
}
public void deleteStudent(StudentVO student) {
students.remove(student.getRollNo());
System.out.println("Student: Roll No " + student.getRollNo() + ", deleted from database");
}
//retrive list of students from the database
public List<StudentVO> getAllStudents() {
return students;
}
public StudentVO getStudent(int rollNo) {
return students.get(rollNo);
}
public void updateStudent(StudentVO student) {
students.get(student.getRollNo()).setName(student.getName());
System.out.println("Student: Roll No " + student.getRollNo() +", updated in the database");
}
}

第3步 - 使用 StudentBO 演示传输对象设计模式。

TransferObjectPatternDemo.java

public class TransferObjectPatternDemo {
   public static void main(String[] args) {
      StudentBO studentBusinessObject = new StudentBO();
  </span><span class="com">//打印所有学生信息</span><span class="pln">
  </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="typ">StudentVO</span><span class="pln"> student </span><span class="pun">:</span><span class="pln"> studentBusinessObject</span><span class="pun">.</span><span class="pln">getAllStudents</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
     </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Student: [RollNo : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> student</span><span class="pun">.</span><span class="pln">getRollNo</span><span class="pun">()</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">", Name : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> student</span><span class="pun">.</span><span class="pln">getName</span><span class="pun">()</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" ]"</span><span class="pun">);</span><span class="pln">
  </span><span class="pun">}</span><span class="pln">

  </span><span class="com">//更新学生信息</span><span class="pln">
  </span><span class="typ">StudentVO</span><span class="pln"> student </span><span class="pun">=</span><span class="pln"> studentBusinessObject</span><span class="pun">.</span><span class="pln">getAllStudents</span><span class="pun">().</span><span class="kwd">get</span><span class="pun">(</span><span class="lit">0</span><span class="pun">);</span><span class="pln">
  student</span><span class="pun">.</span><span class="pln">setName</span><span class="pun">(</span><span class="str">"Michael"</span><span class="pun">);</span><span class="pln">
  studentBusinessObject</span><span class="pun">.</span><span class="pln">updateStudent</span><span class="pun">(</span><span class="pln">student</span><span class="pun">);</span><span class="pln">

  </span><span class="com">//获取指定学生信息</span><span class="pln">
  student </span><span class="pun">=</span><span class="pln"> studentBusinessObject</span><span class="pun">.</span><span class="pln">getStudent</span><span class="pun">(</span><span class="lit">0</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Student: [RollNo : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> student</span><span class="pun">.</span><span class="pln">getRollNo</span><span class="pun">()</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">", Name : "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> student</span><span class="pun">.</span><span class="pln">getName</span><span class="pun">()</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" ]"</span><span class="pun">);</span><span class="pln">

}
}

第4步 - 验证输出。

Student: [RollNo : 0, Name : Robert ]
Student: [RollNo : 1, Name : John ]
Student: Roll No 0, updated in the database
Student: [RollNo : 0, Name : Michael ]

无涯教程-Java 传输对象模式

传输对象设计模式实例

参考链接