如何优雅构建一个很多参数的java对象

构建者模式，参考 go-elastic-client对象的构建，由于参数非常多而且后期会有比较大的变动的可能

正常的想法：

function build(a,b,c,d,e,f,g,h,i,j...)

function build(a,b,c,...)

function build(a,b,...)

随着参数的增多 builder方法会一直增多

并且可变参总是不够灵活，有时候需要2个或者更多个可变参数

优雅一些的写法：

package com.example.one.po;

import lombok.Data;

@Data
public class LoggerDetail {

    private String userName;
    private String userIp;
    private String level;

    public static LoggerDetail builder(String userName,OptionFunc ...optionFunc){
        LoggerDetail loggerDetail = new LoggerDetail();
        loggerDetail.setUserName(userName);
        for (OptionFunc func : optionFunc) {
            func.set(loggerDetail);
        }
        return loggerDetail;
    }
}

定义的接口：

package com.example.one.po;

public interface OptionFunc {
    void set(LoggerDetail loggerDetail);
}

后续就是不断的实现 OptionFunc 进行扩充参数

level :

package com.example.one.po;

public class SetLevel implements OptionFunc{

    private String level;
    @Override
    public void set(LoggerDetail loggerDetail) {
        loggerDetail.setLevel(level);
    }
    public SetLevel(String level){
        this.level = level;
    }
}

userIp

package com.example.one.po;

public class SetUserIp implements OptionFunc{

    private String userIp;

    @Override
    public void set(LoggerDetail loggerDetail) {
        loggerDetail.setUserIp(userIp);
    }

    public SetUserIp(String userIp){
        this.userIp = userIp;
    }
}

调用的方式：

@Test
    public void TestLoggerDetail (){
        LoggerDetail loggerDetail = LoggerDetail.builder(
                "jack",
                new SetUserIp("127.0.0.1"),
                new SetLevel("warn")
        );
        System.out.println(loggerDetail);
}

 

 

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标签：loggerDetail,java,String,level,优雅,构建,userIp,LoggerDetail,public
来源： https://www.cnblogs.com/xuweiqiang/p/16350241.html