package designMode.builder;import com.sun.javafx.collections.MappingChange;import com.sun.xml.internal.xsom.impl.scd.Iterators;import java.util.Map;import java.util.Objects;import java.util.concurrent.ConcurrentHashMap;/** * @description: url Builder * @author: kuroneko * @create: 2020-05-12 16:23 **/public class UrlBuilder {    public static void main(String[] args) {        Map<String, String> map = new ConcurrentHashMap<>();        map.put("a","b");        map.put("c","d");        String https = UrlBuilder.builder()                .setScheme("https")                .setDomain("www.baid.com")                .setPath("xxxx/xxxx/yy")                .setQuery(map)                .build();        System.out.println(https);    }    private String domain;    private String scheme;    private String path;    private Map<String,String> query;    public static UrlBuilder builder(){        UrlBuilder urlBuilder = new UrlBuilder();        urlBuilder.setScheme("http");        return urlBuilder;    }    public UrlBuilder setDomain(String domain) {        if(stringIsBlank(domain)){            throw new RuntimeException("domain为空");        }        this.domain = domain;        return this;    }    public UrlBuilder setScheme(String scheme) {        if(stringIsBlank(domain)){            scheme = "http";        }        this.scheme = scheme;        return this;    }    public UrlBuilder setPath(String path) {        if(stringIsBlank(domain)){            path="";        }        this.path = path;        return this;    }    public UrlBuilder setQuery(Map<String,String> query) {        this.query = query;        return this;    }    public String build(){        if(stringIsBlank(this.domain)){            throw new RuntimeException("domain为空");        }        StringBuilder url = new StringBuilder();        url.append(this.scheme).append("://")                .append(this.domain).append("/");        if(!stringIsBlank(this.path)){            url.append(this.path);        }        if(!this.query.isEmpty()){            url.append("?");            this.query.forEach((k,v)->{                url.append(k).append("=").append(v).append("&");            });            int i = url.lastIndexOf("&");            url.delete(i,i+1);        }        return url.toString();    }    private boolean stringIsBlank(String s){        return Objects.isNull(s) || "".equals(s);    }}