职责链模式Java代码编写：
整体布局如下：
（1）Approver.java:
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:
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：
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:
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:
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:
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:
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:
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
}
}
}
（9）实现截图：
