设计模式系列之建造者模式构建实体类

Love The Way You Lie 2021-09-01 10:16 243阅读 0赞

设计模式系列之建造者模式(Build Pattern)构建实体类

### 模式定义 ###

建造者模式属于23种设计模式中的创建型模式，可以理解为创建对象的一种很好的方法。

所谓建造者模式就是\*\*将组件和组件的组件过程分开，然后一步一步建造一个复杂的对象。\*\*所以建造者模式又叫生成器模式。  
建造者模式类图  
![这里写图片描述][70]

### 模式结构 ###

建造者模式包含如下角色  
Builder：抽象建造者  
ConcreteBuilder：具体建造者  
Director：指挥者  
Product：产品角色

如果系统只需要一个具体的建造者类的时候，可以省略抽象建造者，有时候指挥者类也可以省略，让建造者类同时充当指挥者和建造者

## 例子实践 ##

package com.extra.licenseLog.model;
    
    import java.util.Date;
    
    /** * <pre> * 证照操作记录 * </pre> * * <pre> * @author mazq * 修改记录 * 修改后版本: 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;
    
        /** * 查验证照用户账号 */
        private String userCode;
    
        /** * 查验证照编码 */
        private String certCode;
    
        /** * 查验证照时间 */
        private Date certTime;
    
        /** * 办件流水号 */
        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 + '\'' +
                    '}';
        }
    }

LicenseLogModel logModel = new LicenseLogModel.Builder(commonService.generateUUID())
    				.setHandleSeq(controlStuff.getHandleSeq())
    				.setUserCode(userCode)
    				.setCertCode(authCode)
    				.setCertTime(new Date(System.currentTimeMillis()))
    				.setControlSeq(controlStuff.getControlSeq())
    				.build();

参考同事写的工具类：

package com.template.utils;
    
    import java.util.HashMap;
    import java.util.Map;
    /** * 信息工具类 * @date 2018-05-22 */
    public class Maps { 
    	/** * 成功状态值 */
    	public static final String SUCCESS_VALUE = "1";
    	/** * 失败状态值 */
    	public static final String ERROR_VALUE = "0";
    	/** * 信息key */
    	public static final String MESSAGE_KEY = "message";
    	/** * 状态key */
    	public static final String STATE_KEY = "status";
    	/** * 数据key */
    	public static final String DATA_KEY = "data";
    
    	private Maps(){ }
    	/** * 获取信息MapMessage实例 * @return */
    	public static MapMessageBulider MapMessageBulider(){ 
    		return new MapMessageBulider();
    	}
    	/** * 内部类：信息 * @author csy * @date 2018-05-22 */
    	public static class MapMessageBulider{ 
    		
    		private Map<String, Object> innerMap = new HashMap<String, Object>();
    		/** * 自由封装key/value * @param key * @param value * @return */
    		public MapMessageBulider setKeyValue(String key,Object value){ 
    			this.innerMap.put(key, value);
    			return this;
    		}
    		/** * 返回map * @return */
    		public Map<String, Object> bulid(){ 
    			return this.innerMap;
    		}
    		/** * 设置成功返回值及信息 * 已设置默认的success/message/data key * @param data 数据 * @param message 成功信息 * @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();
    		}
    		/** * 设置返回失败数据及信息 * 已设置默认的success/message/data key * @param data 数据 * @param message 失败信息 * @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();			
    		}
    	}
    }

[70]: /images/20210813/acc4d36b2c634b5a84c23e373546d3b2.png