在Java中傳送HTTP Request可使用java.net.HttpUrlConnection。
下面範例使用POST傳送資料。
public void sendPostRequest() {
String requestUrl = "http://example.com/post";
String token = "token"; // 授權token
String parameters = "name=matt";
byte[] postData = parameters.getBytes(StandardCharsets.UTF_8);
int postDataLength = postData.length;
try {
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true); // post有寫出資料所以要設為true
conn.setInstanceFollowRedirects(false); // 不用自動重新導向所以設為false
conn.setRequestMethod(HttpMethod.POST.name()); // POST
conn.setRequestProperty("Authorization", token);
conn.setRequestProperty("Content-Type", MediaType.APPLICATION_FORM_URLENCODED_VALUE); // application/x-www-form-urlencoded
conn.setRequestProperty("charset", StandardCharsets.UTF_8.name()); // UTF-8
conn.setRequestProperty("Content-Length", Integer.toString(postDataLength));
conn.setUseCaches(false);
// 寫出 post data
new DataOutputStream(conn.getOutputStream()).write(postData);
// 讀取 response data
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer responseData = new StringBuffer();
while ((inputLine = reader.readLine()) != null) {
responseData.append(inputLine);
}
reader.close();
System.out.println(responseData.toString()); // 印出"success"
List cookies = conn.getHeaderFields().get("Set-Cookie"); // 取得response的cookies
for(String s : cookies) {
String[] cookie = s.split("=");
if("mycookie".equalsIgnoreCase(cookie[0])) {
System.out.println(cookie[1]); // 印出"hello_world"
}
}
} catch(MalformedURLException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
下面為接收上面傳送的url的Spring Controller RequestMapping方法，並設定response的cookie。
@PostMapping(value="/post", consumes=MediaType.APPLICATION_FORM_URLENCODED_VALUE, produces=MediaType.TEXT_PLAIN_VALUE)
public String post(@RequestParam String name, HttpServletResponse response) throws IOException{
System.out.println(name); // 印出"matt"
Cookie cookie = new Cookie("mycookie","hello_world");
response.addCookie(cookie);
return "success";
}
參考：
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