标签：return String -- 适配器 number void 设计模式 public desc
适配器模式
引例
简介
基本介绍
适配器模式(Adapter Pattern)将某个类的接口转换成客户端期望的另一个接口表示，主的目的是兼容性，让原本因接口不匹配不能一起工作的两个类可以协同工作。
工作原理
- 适配器模式：将一个类的接口转换成另一种接口.让 原本接口不兼容的类可以兼容。
- 从用户的角度看不到被适配者，是解耦的。
- 用户调用适配器转化出来的目标接口方法，适配器再调用被适配者的相关接口方法。
- 用户收到反馈结果，感觉只是和目标接口交互。
示例
在实际业务开发中，经常需要做不同接口的兼容，尤其是中台服务。中台服务需要把各个业务线的类型服务同一包装，在对外提供接口。
在营销系统中，会遇到各种各样的MQ消息或接口，例：开户，内部订单、外部订单，如果逐个开发，会耗费很高的成本。此时，就需要有这样一个系统：能把外部MQ接入。
代码
public class CreateAccountMQ {
private String number;
private String address;
private Date accountDate;
private String description;
public CreateAccountMQ() {
}
public CreateAccountMQ(String number, String address, Date accountDate, String decription) throws ParseException {
this.number = number;
this.address = address;
this.accountDate = accountDate;
this.description = decription;
}
public String getNumber() {
return number;
}
public String getAddress() {
return address;
}
public Date getAccountDate() {
return accountDate;
}
public String getDecription() {
return description;
}
public void setNumber(String number) {
this.number = number;
}
public void setAddress(String address) {
this.address = address;
}
public void setAccountDate(Date accountDate) {
this.accountDate = accountDate;
}
public void setDecription(String decription) {
this.description = decription;
}
@Override
public String toString() {
return "{\"number\":\""+number+"\",\"address\":\""+address+"\",\"accountDate\","+accountDate+",\"description\",\""+description+"\"}";
}
}
public class OrderMQ {
private String uId;
private String goodId;
private String orderId;
private Date createOrderDate;
private String desc;
public OrderMQ() {
}
public OrderMQ(String uId, String goodId, String orderId, Date createOrderDate,String desc) throws ParseException {
this.uId = uId;
this.goodId = goodId;
this.orderId = orderId;
this.createOrderDate = createOrderDate;
this.desc=desc;
}
public String getUId() {
return uId;
}
public String getGoodId() {
return goodId;
}
public String getOrderId() {
return orderId;
}
public Date getCreateOrderDate() {
return createOrderDate;
}
public void setuId(String uId) {
this.uId = uId;
}
public void setGoodId(String goodId) {
this.goodId = goodId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
public void setCreateOrderDate(Date createOrderDate) {
this.createOrderDate = createOrderDate;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "{\"uId\":\""+uId+"\",\"goodId\":\""+goodId+"\",\"orderId\":\""+orderId+"\",\"createOrderDate\":"+createOrderDate+"}";
}
}
目标类
```c
public class RebateInfo {
private String userId;
private String bizId;
private String bizDate;
private String desc;
public String getBizId() {
return bizId;
}
public String getBizDate() {
return bizDate;
}
public String getDesc() {
return desc;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public void setBizId(String bizId) {
this.bizId = bizId;
}
public void setBizDate(String bizDate) {
this.bizDate = bizDate;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "RebateInfo{" +
"userId='" + userId + '\'' +
", bizId='" + bizId + '\'' +
", bizDate=" + bizDate +
", desc='" + desc + '\'' +
'}';
}
}
适配类
public class MQAdapter {
/*
Map<String,String> link 两种消息转换的中间的联系map
*/
public static RebateInfo filter(String jsonStr, Map<String,String> link) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Gson gson=new Gson();
Map map = gson.fromJson(jsonStr,new
TypeToken<HashMap<String,Object>>(){}.getType());
RebateInfo rebateInfo=new RebateInfo();
for(String key:link.keySet()){
Object o = map.get(link.get(key));
RebateInfo.class.getMethod("set"+key.substring(0,1).toUpperCase()+key.substring(1),String.class).invoke(rebateInfo,o);
}
return rebateInfo;
}
}
测试
@Test
public void test() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ParseException {
Gson gson=new Gson();
CreateAccountMQ createAccount=new CreateAccountMQ("10001","江苏省镇江市",new Date(),"开户");
Map<String,String > link=new HashMap<>();
link.put("userId","number");
link.put("bizId","number");
link.put("bizDate","accountDate");
link.put("desc","description");
RebateInfo rebateInfo = MQAdapter.filter(gson.toJson(createAccount), link);
System.out.println("适配前：");
System.out.println(createAccount.toString());
System.out.println("适配后：");
System.out.println(rebateInfo.toString());
System.out.println("----------------------------------------------------");
OrderMQ orderMQ=new OrderMQ("10002","1054649795","10549779756999",new Date(),"订单");
Map<String,String > link2=new HashMap<>();
link2.put("userId","uId");
link2.put("bizId","orderId");
link2.put("bizDate","createOrderDate");
link2.put("desc","desc");
RebateInfo rebateInfo2 = MQAdapter.filter(gson.toJson(orderMQ), link2);
System.out.println("适配前：");
System.out.println(orderMQ.toString());
System.out.println("适配后：");
System.out.println(rebateInfo2.toString());
}
结果：
适配前：
{"number":"10001","address":"江苏省镇江市","accountDate",Mon Oct 18 21:48:26 CST 2021,"description","开户"}
适配后：
RebateInfo{userId='10001', bizId='10001', bizDate=Oct 18, 2021 9:48:26 PM, desc='开户'}
----------------------------------------------------
适配前：
{"uId":"10002","goodId":"1054649795","orderId":"10549779756999","createOrderDate":Mon Oct 18 21:48:26 CST 2021}
适配后：
RebateInfo{userId='10002', bizId='10549779756999', bizDate=Oct 18, 2021 9:48:26 PM, desc='订单'}
标签：return,String,--,适配器,number,void,设计模式,public,desc 来源： https://blog.csdn.net/m0_46633875/article/details/120834900
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