Http Post請求提交json格式數據工具類，解決請求參數中文亂碼問題

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.log4j.Logger;

import com.google.gson.Gson;

public class HttpUtil {
    private static final Logger LOGGER = Logger.getLogger(HttpUtil.class);

    public static final String DEF_CHATSET = "UTF-8";
    public static final int DEF_CONN_TIMEOUT = 30000;
    public static final int DEF_READ_TIMEOUT = 30000;
    public static String userAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";

    public static String sendRequest(final String url,
            final QuestionBean params, final String requestMethod) {
        final String result = net(url, params, requestMethod);
        LOGGER.info(result);
        return result;
    }

    /**
     *
     * @param strUrl
     *            請求地址
     * @param params
     *            請求參數
     * @param method
     *            請求方法
     * @return 網絡請求字符串
     *
     */
    public static String net(String strUrl, final QuestionBean params,
            final String method) {
        HttpURLConnection conn = null;
        BufferedReader reader = null;
        String rs = null;
        try {
            final StringBuffer sb = new StringBuffer();
            final URL url = new URL(strUrl);
            conn = (HttpURLConnection) url.openConnection();
            if (method == null || method.equals("GET")) {
                conn.setRequestMethod("GET");
            } else {
                conn.setRequestMethod("POST");
                conn.setDoOutput(true);
            }
            conn.setRequestProperty("User-agent", userAgent);

            // 設置文件類型:
            conn.setRequestProperty("Content-Type",
                    "application/json;charset=UTF-8");
            // 設置接收類型否則返回415錯誤
            // conn.setRequestProperty("accept","*/*")此處爲暴力方法設置接受所有類型，以此來防範返回415;
            conn.setRequestProperty("accept", "application/json");
            conn.setUseCaches(false);
            conn.setConnectTimeout(DEF_CONN_TIMEOUT);
            conn.setReadTimeout(DEF_READ_TIMEOUT);
            conn.setInstanceFollowRedirects(false);
            conn.connect();
            if (params != null && "POST".equals(method)) {
                DataOutputStream out = new DataOutputStream(
                        conn.getOutputStream());
                out.write(urlencodeToJson(params).getBytes());
            }
            final InputStream is = conn.getInputStream();
            reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));
            String strRead = null;
            while ((strRead = reader.readLine()) != null) {
                sb.append(strRead);
            }
            rs = sb.toString();
        } catch (final IOException e) {
            LOGGER.error(e);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (final IOException e) {
                    LOGGER.error(e);
                }
            }
            if (conn != null) {
                conn.disconnect();
            }
        }
        return rs;
    }

    // 將對象轉爲json請求參數型
    public static String urlencodeToJson(final QuestionBean data) {
        return new Gson().toJson(data);
    }

}