Question

所以，我将通过iphone连接到servlet并使用HTTP。我实际上正在开发一个多人游戏，想知道如何通过HTTP get（doGet）将特定数据发送到iphone。我在iphone上使用libcurl（cocos2d-x）。

以下是我的代码设置方式：

size_t write_data(void* buffer, size_t size, size_t nmemb, void *data)
{
    //do stuff with data        
}

//main or some init method
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl)
{
    char *data = "hi imma get=yeah";
    curl_easy_setopt(curl, CURLOPT_URL, "http://whatever.com");
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); 

    res = curl_easy_perform(curl);
    if(res != CURLE_OK)
    {
              CCLOG("WELP BETTER DO SOMETHING ERROR");
    }

    curl_easy_cleanup(curl);
}

那么，我想知道的是我如何在java中的doGet方法中使用响应来将字符串发送到上面定义的write_function？如同，在doGet方法中如何处理响应参数？

这里的参考是doGet方法：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws    ServletException, IOException
 {
    System.out.println("GET METHOD CALLED");

 }

那么，现在我该如何处理将一些数据传递给write_function的响应呢？

谢谢，任何和所有输入！

Answer 1

使用response的Writer，如下所示。

protected void doGet(HttpServletRequest request, HttpServletResponse response) 
    throws ServletException, IOException
{
    // tell response what format your output is in, we select plain text here
    response.setContentType("text/plain;charset=UTF-8");
    // ask the response object for a Writer object
    PrintWriter out = response.getWriter();
    try {
        // and use it like you would use System.out.  Only, this stuff gets sent 
        //to the client
        out.println("GET METHOD CALLED");
    } finally {
        // housekeeping: ensure that the Writer is closed when you're ready.
        out.close();
    }
}

在某些情况下，使用Stream更容易。这也是可能的但你永远不能同时打开Writer和OutputStream 。

protected void doGet(HttpServletRequest request, HttpServletResponse response) 
    throws ServletException, IOException
{
    response.setContentType("text/plain;charset=UTF-8");
    // ask the response object for an OutputStream object
    OutputStream os = response.getOutputStream();

    try {
        // output some stuff, here just the characters ABC
        os.write(new byte[]{65,66,67});
    } finally {            
        os.close();
    }

}

如果您想了解更多信息，网上有大量关于servlet的教程，包括Servlet chapter of the official Java EE tutorial on oracle.com

如何通过HTTP发送数据获取Java？

1 个答案: