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"
