JAVA Request获取所有请求参数

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Map params = request.getParameterMap();
String queryString = "";
for (String key : params.keySet()) {
    String[] values = params.get(key);
    for (int i = 0; i < values.length; i++) {
        String value = values[i];
        queryString += key + "=" + value + "&";
    }
}
queryString = queryString.substring(0, queryString.length() - 1);
System.out.println(queryString);