代码的目标是将参数插入表单然后提交表单,然后将表单数据输入MySQL数据库。问题是该方法不会发布数据。我不确定我做错了什么,我已经看过很多关于这个的问题,但似乎没什么用。
这是表格。
<form action="http://localhost/Documents/dataadded.php" method="post">
<b>Add a New Data</b>
<p>Email Address:
<input type="text" name="email_address" size="30" value="" />
</p>
<p>Email Pass:
<input type="text" name="email_pass" size="30" value="" />
</p>
<p>
<input type="submit" name="submit" value="Send" />
</p>
</form>
这是Java代码。
public static void main(String[] args) {
String key1 = "email_address";
String key2 = "email_pass";
String key3 = "submit";
String param1 = "testemail@gmail.com";
String param2 = "password123";
String param3 = "Send";
try {
URL website = new URL("http://localhost/Documents/added.php");
Map<String,String> arguments = new LinkedHashMap<>();
arguments.put(key1, param1);
arguments.put(key2, param2);
arguments.put(key3, param3);
StringJoiner sj = new StringJoiner("&");
for(Map.Entry<String,String> entry : arguments.entrySet())
sj.add(URLEncoder.encode(entry.getKey(), "UTF-8") + "="
+ URLEncoder.encode(entry.getValue(), "UTF-8"));
byte[] out = sj.toString().getBytes(StandardCharsets.UTF_8);
int length = out.length;
HttpURLConnection connection = (HttpURLConnection) website.openConnection();
connection.setRequestMethod("POST");
connection.setFixedLengthStreamingMode(length);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
connection.setDoOutput(true);
connection.getOutputStream().write(out);
System.out.println(sj.toString());
InputStream response = connection.getInputStream();
@SuppressWarnings("resource")
Scanner scan = new Scanner(response);
String responsebody = scan.useDelimiter("\\A").next();
System.out.println(responsebody);
} catch (IOException e) {
e.printStackTrace();
}
}
如果有人能够了解代码的错误,我们将不胜感激。
答案 0 :(得分:0)
您必须先刷新OutputStream,然后才能打开InputStream。下面是我创建POST请求的方法。
private String doPost(String urlString, LinkedHashMap<String, String> params) throws Exception {
//...make the content
StringBuilder content = new StringBuilder();
//...append params
boolean first = true;
for (Map.Entry<String, String> entry : params.entrySet()) {
if (!first) {
content.append("&");
} else {
first = false;
}
content.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), charset));
}
//... send POST request
URL url = new URL(urlString);
HttpURLConnection con;
con = (HttpURLConnection) url.openConnection();
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
try (OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream(), charset)) {
writer.write(content.toString());
writer.flush();
}
//...get response
try (Scanner s = new Scanner(con.getInputStream(), charset)) {
String resp = s.useDelimiter("\\A").hasNext() ? s.next() : "";
return resp;
}
}