十一月二日

软件设计——职责链模式之审批处理

整体布局如下：

（1）Approver.java:

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package shiyan15;        public abstract class Approver {       //抽象处理者        protected Approver successor;// 后继对象   protected String name;        public Approver(String name) {   this.name = name;   }        // 设置后继者   public void setSuccessor(Approver successor) {   this.successor = successor;   }        // 抽象请求处理方法   public abstract void processRequest(PurchaseRequest request);   }

（2）Client.java:

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package shiyan15;        public class Client {        public static void main(String[] args) {   Approver wjzhang, rhuang, gyang, jguo, meeting;   wjzhang = new Director("张三");   rhuang = new Manager("李四");   gyang = new VicePresident("马五");   jguo = new President("李想");   meeting = new Congress("职工大会");        // 创建职责链   wjzhang.setSuccessor(rhuang);   rhuang.setSuccessor(gyang);   gyang.setSuccessor(jguo);   jguo.setSuccessor(meeting);        // 创建采购单   PurchaseRequest pr1 = new PurchaseRequest(5000, 10001, "购买A4纸十万张");   wjzhang.processRequest(pr1);        PurchaseRequest pr2 = new PurchaseRequest(40000, 10002, "购买打印机十台");   wjzhang.processRequest(pr2);        PurchaseRequest pr3 = new PurchaseRequest(90000, 10003, "购买咖啡机十台");   wjzhang.processRequest(pr3);        PurchaseRequest pr4 = new PurchaseRequest(180000, 10004, "购买电脑一百台");   wjzhang.processRequest(pr4);        PurchaseRequest pr5 = new PurchaseRequest(800000, 10005, "购买投影仪两百台");   wjzhang.processRequest(pr5);   }   }

（3）Congress.java：

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package shiyan15;        public class Congress extends Approver {        public Congress(String name) {   super(name);   }        @Override   public void processRequest(PurchaseRequest request) {   System.out.println("召开职工大会审批采购单：" + request.getNumber() + "," + "金额：" + request.getAmount() + "元，采购目的："   + request.getPurpose() + ".");   }        }

（4）Director.java:

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package shiyan15;        public class Director extends Approver {   //具体处理者        public Director(String name) {   super(name);        }        @Override   public void processRequest(PurchaseRequest request) {   if (request.getAmount() < 10000) {   System.out.println("主任" + this.name + "审批采购单：" + request.getNumber() + "," + "金额：" + request.getAmount()   + "元，采购目的：" + request.getPurpose() + ".");   } else {   this.successor.processRequest(request);// 转发请求   }        }   }

（5）Manager.java:

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package shiyan15;        public class Manager extends Approver {        public Manager(String name) {   super(name);   }        @Override   public void processRequest(PurchaseRequest request) {   if (request.getAmount() < 50000) {   System.out.println("部门经理" + this.name + "审批采购单：" + request.getNumber() + "," + "金额：" + request.getAmount()   + "元，采购目的：" + request.getPurpose() + ".");   } else {   this.successor.processRequest(request);// 转发请求   }        }        }

（6）Prisident.java:

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package shiyan15;        public class President extends Approver {        public President(String name) {   super(name);   }        @Override   public void processRequest(PurchaseRequest request) {   if (request.getAmount() < 200000) {   System.out.println("总经理" + this.name + "审批采购单：" + request.getNumber() + "," + "金额：" + request.getAmount()   + "元，采购目的：" + request.getPurpose() + ".");   } else {   }   }   }

（7）PurchaseRequest.java:

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package shiyan15;        public class PurchaseRequest {            //采购人员类        private double amount;// 采购金额   private int number;// 采购单编号   private String purpose;// 采购目的        public PurchaseRequest(double amount, int number, String purpose) {   this.amount = amount;   this.number = number;   this.purpose = purpose;   }        public double getAmount() {   return amount;   }        public void setAmount(double amount) {   this.amount = amount;   }        public int getNumber() {   return number;   }        public void setNumber(int number) {   this.number = number;   }        public String getPurpose() {   return purpose;   }   public void setPurpose(String purpose) {   this.purpose = purpose;   }   }

（8）VicePresident.java:

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package shiyan15;        public class VicePresident extends Approver {        public VicePresident(String name) {   super(name);   }        @Override   public void processRequest(PurchaseRequest request) {   if (request.getAmount() < 100000) {   System.out.println("副总经理" + this.name + "审批采购单：" + request.getNumber() + "," + "金额：" + request.getAmount()   + "元，采购目的：" + request.getPurpose() + ".");   } else {   this.successor.processRequest(request);// 转发请求   }   }   }