設計模式系列之建造者模式(Build Pattern)建構實體類
模式定義
建造者模式屬于23種設計模式中的建立型模式，可以了解為建立對象的一種很好的方法。
所謂建造者模式就是**将元件群組件的元件過程分開，然後一步一步建造一個複雜的對象。**是以建造者模式又叫生成器模式。
建造者模式類圖
模式結構
建造者模式包含如下角色
Builder：抽象建造者
ConcreteBuilder：具體建造者
Director：指揮者
Product：産品角色
如果系統隻需要一個具體的建造者類的時候，可以省略抽象建造者，有時候指揮者類也可以省略，讓建造者類同時充當指揮者和建造者
例子實踐
package com.extra.licenseLog.model;
import java.util.Date;
/**
* <pre>
* 證照操作記錄
* </pre>
*
* <pre>
* @author mazq
* 修改記錄
* 修改後版本: 修改人： 修改日期: 2020/08/15 10:21 修改内容:
* </pre>
*/
public class LicenseLogModel {
/**
* 日志SEQ
*/
private String seq;
/**
* 痕迹表SEQ
*/
private String handleSeq;
/**
* 查驗證照使用者賬号
*/
private String userCode;
/**
* 查驗證照編碼
*/
private String certCode;
/**
* 查驗證照時間
*/
private Date certTime;
/**
* 辦件流水号
*/
private String controlSeq;;
public LicenseLogModel() {
}
public LicenseLogModel(String seq) {
this.seq = seq;
}
public LicenseLogModel(String seq, String handleSeq, String userCode, String certCode, Date certTime, String controlSeq) {
this.seq = seq;
this.handleSeq = handleSeq;
this.userCode = userCode;
this.certCode = certCode;
this.certTime = certTime;
this.controlSeq = controlSeq;
}
private LicenseLogModel(Builder builder){
this.seq = builder.seq;
this.handleSeq = builder.handleSeq;
this.userCode = builder.userCode;
this.certCode = builder.certCode;
this.certTime = builder.certTime;
this.controlSeq = builder.controlSeq;
}
public String getSeq() {
return seq;
}
public void setSeq(String seq) {
this.seq = seq;
}
public String getHandleSeq() {
return handleSeq;
}
public void setHandleSeq(String handleSeq) {
this.handleSeq = handleSeq;
}
public String getUserCode() {
return userCode;
}
public void setUserCode(String userCode) {
this.userCode = userCode;
}
public Date getCertTime() {
return certTime;
}
public void setCertTime(Date certTime) {
this.certTime = certTime;
}
public String getCertCode() {
return certCode;
}
public void setCertCode(String certCode) {
this.certCode = certCode;
}
public String getControlSeq() {
return controlSeq;
}
public void setControlSeq(String controlSeq) {
this.controlSeq = controlSeq;
}
public static class Builder {
private String seq;
private String handleSeq;
private String userCode;
private String certCode;
private Date certTime;
private String controlSeq;
public Builder(String seq){
this.seq = seq;
}
public Builder setSeq(String seq) {
this.seq = seq;
return this;
}
public Builder setHandleSeq(String handleSeq) {
this.handleSeq = handleSeq;
return this;
}
public Builder setUserCode(String userCode) {
this.userCode = userCode;
return this;
}
public Builder setCertCode(String certCode){
this.certCode = certCode;
return this;
}
public Builder setCertTime(Date certTime) {
this.certTime = certTime;
return this;
}
public Builder setControlSeq(String controlSeq){
this.controlSeq = controlSeq;
return this;
}
public LicenseLogModel build(){
return new LicenseLogModel(this);
}
}
@Override
public String toString() {
return "LicenseLogModel{" +
"seq='" + seq + '\'' +
", handleSeq='" + handleSeq + '\'' +
", userCode='" + userCode + '\'' +
", certCode='" + certCode + '\'' +
", certTime=" + certTime +
", controlSeq='" + controlSeq + '\'' +
'}';
}
} 複制
LicenseLogModel logModel = new LicenseLogModel.Builder(commonService.generateUUID())
.setHandleSeq(controlStuff.getHandleSeq())
.setUserCode(userCode)
.setCertCode(authCode)
.setCertTime(new Date(System.currentTimeMillis()))
.setControlSeq(controlStuff.getControlSeq())
.build(); 複制
參考同僚寫的工具類：
package com.template.utils;
import java.util.HashMap;
import java.util.Map;
/**
* 資訊工具類
* @date 2018-05-22
*/
public class Maps {
/**
* 成功狀态值
*/
public static final String SUCCESS_VALUE = "1";
/**
* 失敗狀态值
*/
public static final String ERROR_VALUE = "0";
/**
* 資訊key
*/
public static final String MESSAGE_KEY = "message";
/**
* 狀态key
*/
public static final String STATE_KEY = "status";
/**
* 資料key
*/
public static final String DATA_KEY = "data";
private Maps(){}
/**
* 擷取資訊MapMessage執行個體
* @return
*/
public static MapMessageBulider MapMessageBulider(){
return new MapMessageBulider();
}
/**
* 内部類：資訊
* @author csy
* @date 2018-05-22
*/
public static class MapMessageBulider{
private Map<String, Object> innerMap = new HashMap<String, Object>();
/**
* 自由封裝key/value
* @param key
* @param value
* @return
*/
public MapMessageBulider setKeyValue(String key,Object value){
this.innerMap.put(key, value);
return this;
}
/**
* 傳回map
* @return
*/
public Map<String, Object> bulid(){
return this.innerMap;
}
/**
* 設定成功傳回值及資訊
* 已設定預設的success/message/data key
* @param data 資料
* @param message 成功資訊
* @return
*/
public Map<String, Object> setSuccessBulid(Object data,Object message){
this.setKeyValue(STATE_KEY, SUCCESS_VALUE)
.setKeyValue(MESSAGE_KEY, message)
.setKeyValue(DATA_KEY, data);
return this.bulid();
}
/**
* 設定傳回失敗資料及資訊
* 已設定預設的success/message/data key
* @param data 資料
* @param message 失敗資訊
* @return
*/
public Map<String, Object> setErrorBulid(Object data,Object message){
this.setKeyValue(STATE_KEY, ERROR_VALUE)
.setKeyValue(MESSAGE_KEY, message)
.setKeyValue(DATA_KEY, data);
return this.bulid();
}
}
} 複制