[英]Send Multiple POST Requests Through a DataOutputStream in Java
I am trying to use a for loop to send multiple POST requests through a DataOutputStream and then close it. 我试图使用for循环通过DataOutputStream发送多个POST请求,然后关闭它。 At the moment, only the first index of the " trades " array list is sent to the website. 目前,只有“ 交易 ”数组列表的第一个索引被发送到网站。 Any other indexes are ignored and I'm assuming they are not being sent. 任何其他索引都被忽略,我假设它们没有被发送。 I wonder if I am properly flushing the stream? 我想知道我是否正好冲洗了这条小溪? Thank you!!! 谢谢!!!
Examples of trades values: "101841599", "101841801" 交易价值的例子:“101841599”,“101841801”
Example of code value: 85e4c22 代码值示例:85e4c22
Snippet of my code: 我的代码片段:
private ArrayList<String> trades = new ArrayList<String>();
private String code;
String url = "http://www.dota2lounge.com/ajax/bumpTrade.php";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Accept-Language", "en-US,en;q=0.8");
con.setRequestProperty("Cookie", cookie);
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
for(int i=0; i<trades.size(); i++){
wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes("trade=" + trades.get(i) + "&code=" + code);
wr.flush();
System.out.println("again");
}
wr.flush();
wr.close();
It turns out I had to actually get the response for it to properly close the connection before I started a new one. 事实证明,在开始新连接之前,我必须真正得到它的响应以正确关闭连接。 Appending these lines to the end of the for loop fixed the issue: 将这些行附加到for循环的末尾可以解决问题:
int nothing = con.getResponseCode();
String morenothing = con.getResponseMessage();
From the HttpURLConnection javadoc : "Each HttpURLConnection instance is used to make a single request but the underlying network connection to the HTTP server may be transparently shared by other instances." 来自HttpURLConnection javadoc :“每个HttpURLConnection实例用于发出单个请求,但与HTTP服务器的底层网络连接可以由其他实例透明地共享。”
So if you want to send multiple requests, then for each request call obj.openConnection(), set the connection settings, open the OutputStream, and write the data. 因此,如果要发送多个请求,则为每个请求调用obj.openConnection(),设置连接设置,打开OutputStream,然后写入数据。 Your Java runtime is permitted to keep the actual connection open to save time and bandwidth. 允许您的Java运行时保持实际连接打开以节省时间和带宽。
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