解决HttpURLConnection请求时传中文参数乱码问题

解决HttpURLConnection请求时传中文参数乱码

前提： 项目的编码是utf-8， 即要保证项目下所有文件的编码都是utf-8
示例代码如下：

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setCharacterEncoding("utf-8");
    request.setCharacterEncoding("utf-8");
    response.setContentType("text/html;charset=utf-8");

    String mobilePhone = request.getParameter("mobilePhone");
    String realName = request.getParameter("realName");


    realName = URLEncoder.encode(realName, "utf-8");

    String params = "method=" + method 
            + "&appId=" + appId 
            + "&sign=" + sign
            + "×tamp=" + timestamp
            + "&mdn=" + mobilePhone
            + "&realName=" + realName;

    String returnStr = ApiUtil.getResult(Constants.CLOUD_API, params, "utf-8");
    JSONObject jo = (JSONObject) JSONObject.parse(returnStr);

    response.getWriter().print(jo);
    response.getWriter().flush();
    response.getWriter().close();

}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.doGet(request, response);
}

realName可能出现中文， 我们对其进行URLEncoder编码, ApiUtil.getResult(Constants.CLOUD_API, params, "utf-8");这里传递utf-8参数

/** 
 * @param urlStr 
 *            请求的地址 
 * @param content 
 *            请求的参数 格式为：name=xxx&pwd=xxx 
 * @param encoding 
 *            服务器端请求编码。如GBK,UTF-8等 
 * @return 
 */  
public static String getResult(String urlStr, String content, String encoding) {  
    URL url = null;  
    HttpURLConnection connection = null;  
    try {  
        url = new URL(urlStr);  
        connection = (HttpURLConnection) url.openConnection();// 新建连接实例  
        connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫秒  
        connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫秒  
        connection.setDoOutput(true);// 是否打开输出流 true|false  
        connection.setDoInput(true);// 是否打开输入流true|false  
        connection.setRequestMethod("POST");// 提交方法POST|GET  
        connection.setUseCaches(false);// 是否缓存true|false
        connection.setRequestProperty("Accept-Charset", encoding);
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + encoding);
        connection.connect();// 打开连接端口  
        DataOutputStream out = new DataOutputStream(connection  
                .getOutputStream());// 打开输出流往对端服务器写数据  
        out.writeBytes(content);// 写数据,也就是提交你的表单 name=xxx&pwd=xxx  
        out.flush();// 刷新  
        out.close();// 关闭输出流  
        BufferedReader reader = new BufferedReader(new InputStreamReader(  
                connection.getInputStream(), encoding));// 往对端写完数据对端服务器返回数据  
        // ,以BufferedReader流来读取  
        StringBuffer buffer = new StringBuffer();  
        String line = "";  
        while ((line = reader.readLine()) != null) {  
            buffer.append(line);  
        }  
        reader.close();  
        return buffer.toString();  
    } catch (IOException e) {  
        e.printStackTrace();  
    } finally {  
        if (connection != null) {  
            connection.disconnect();// 关闭连接  
        }  
    }  
    return null;  
}

标准的 HTTP POST 是一种 application/x-www-form-urlencoded 类型的网络表单，传递的参数都会被写入请求信息主体中。

connection.setRequestProperty("Accept-Charset", encoding);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + encoding);