有没有Java的http_build_query函数的Java等价物？ [英] Is there any Java equivalent of PHP's http_build_query function?

问题描述

我有一个包含我的数据的Map，并希望用它构建一个查询字符串，就像我在PHP上使用http_build_query一样。我不确定这段代码是否是最好的实现，或者我忘记了什么？

I have a Map with my data and want to build a query string with it, just like I would with http_build_query on PHP. I'm not sure if this code is the best implementation of it or if I'm forgetting something?

public String toQueryString(Map<?, ?> data) throws UnsupportedEncodingException {
    StringBuffer queryString = new StringBuffer();

    for (Entry<?, ?> pair : data.entrySet()) {
        queryString.append ( URLEncoder.encode ( (String) pair.getKey (), "UTF-8" ) + "=" );
        queryString.append ( URLEncoder.encode ( (String) pair.getValue (), "UTF-8" ) + "&" );
    }

    if (queryString.length () > 0) {
        queryString.deleteCharAt ( queryString.length () - 1 );
    }

    return queryString.toString ();
}

推荐答案

查看 QueryStringBuilder class及其测试类：

look at the QueryStringBuilder class and its test class :

private String httpBuildQuery(Map<String, String> data)
        throws UnsupportedEncodingException {
    QueryStringBuilder builder = new QueryStringBuilder();
    for (Entry<String, String> pair : data.entrySet()) {
        builder.addQueryParameter(pair.getKey(), pair.getValue());
    }
    return builder.encode("UTF-8");
}

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