Commons HttpClient PostMethodで日本語パラメータ例

final HttpClient client = new HttpClient();
        
PostMethod method = new PostMethod("http://yourdomain/yourservlet"); //ここは適当なURLに入れ替えてください。

NameValuePair username   = new NameValuePair("userId", "test");
NameValuePair title   = new NameValuePair("name", "日本語パラメータですよ");

NameValuePair []params = {
    username, 
    title
};

method.setRequestBody(params);
method.getParams().setContentCharset("UTF-8"); //文字コード

int status = client.executeMethod(method); //送信
...

HttpServletRequest req ...
String value = req.getParameter("title");