是否有Java包来处理构建URL？

是否有Java包来处理构建URL？

我发现apache
httpcomponents
是用于处理Java中HTTP的可靠且通用的库。但是，这是一个示例类，可能足以构建URL查询字符串：

import java.net.URLEnprer;public class QueryString {    private String query = "";    public QueryString(HashMap<String, String> map) {        Iterator it = mp.entrySet().iterator();        while (it.hasNext()) { Map.Entry pairs = (Map.Entry)it.next(); query += URLEnprer.enpre(pairs.getKey(), "utf-8") + "=" + URLEnprer.enpre(pairs.getValue(), "utf-8"); if (it.hasNext()) { query += "&"; }        }    }    public QueryString(Object name, Object value) {        query = URLEnprer.enpre(name.toString(), "utf-8") + "=" + URLEnprer.enpre(value.toString(), "utf-8");    }    public QueryString() { query = ""; }    public synchronized void add(Object name, Object value) {        if (!query.trim().equals("")) query += "&";        query += URLEnprer.enpre(name.toString(), "utf-8") + "=" + URLEnprer.enpre(value.toString(), "utf-8");    }    public String toString() { return query; }}

用法：

HashMap<String, String> map = new HashMap<String, String>();map.put("hello", "world");map.put("lang", "en");QueryString q = new QueryString(map);System.out.println(q);// => "hello=world&lang=en"