如何在 HttpURLConnection 中發送 PUT、DELETE HTTP 請求？

Question

我想知道是否可以通過java.net.HttpURLConnection將 PUT、DELETE 請求（實際上）發送到基於 HTTP 的 URL。

我已經閱讀了很多描述如何發送 GET、POST、TRACE、OPTIONS 請求的文章，但我仍然沒有找到任何成功執行 PUT 和 DELETE 請求的示例代碼。

Answer 1

要執行 HTTP PUT：

URL url = new URL("http://www.example.com/resource");
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestMethod("PUT");
OutputStreamWriter out = new OutputStreamWriter(
    httpCon.getOutputStream());
out.write("Resource content");
out.close();
httpCon.getInputStream();

要執行 HTTP DELETE：

URL url = new URL("http://www.example.com/resource");
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestProperty(
    "Content-Type", "application/x-www-form-urlencoded" );
httpCon.setRequestMethod("DELETE");
httpCon.connect();

Answer 2

這對我來說是這樣的：

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("DELETE");
int responseCode = connection.getResponseCode();

Answer 3

我同意@adietisheim 和其他建議使用 HttpClient 的人。

我花了一些時間嘗試使用 HttpURLConnection 對休息服務進行簡單的調用，但它並沒有說服我，之后我嘗試使用 HttpClient，它確實更容易、更容易理解和更好。

進行 put http 調用的代碼示例如下：

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPut putRequest = new HttpPut(URI);

StringEntity input = new StringEntity(XML);
input.setContentType(CONTENT_TYPE);

putRequest.setEntity(input);
HttpResponse response = httpClient.execute(putRequest);

Answer 4

public  HttpURLConnection getHttpConnection(String url, String type){
        URL uri = null;
        HttpURLConnection con = null;
        try{
            uri = new URL(url);
            con = (HttpURLConnection) uri.openConnection();
            con.setRequestMethod(type); //type: POST, PUT, DELETE, GET
            con.setDoOutput(true);
            con.setDoInput(true);
            con.setConnectTimeout(60000); //60 secs
            con.setReadTimeout(60000); //60 secs
            con.setRequestProperty("Accept-Encoding", "Your Encoding");
            con.setRequestProperty("Content-Type", "Your Encoding");
        }catch(Exception e){
            logger.info( "connection i/o failed" );
        }
        return con;
}

然后在你的代碼中：

public void yourmethod(String url, String type, String reqbody){
    HttpURLConnection con = null;
    String result = null;
    try {
        con = conUtil.getHttpConnection( url , type);
    //you can add any request body here if you want to post
         if( reqbody != null){  
                con.setDoInput(true);
                con.setDoOutput(true);
                DataOutputStream out = new  DataOutputStream(con.getOutputStream());
                out.writeBytes(reqbody);
                out.flush();
                out.close();
            }
        con.connect();
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String temp = null;
        StringBuilder sb = new StringBuilder();
        while((temp = in.readLine()) != null){
            sb.append(temp).append(" ");
        }
        result = sb.toString();
        in.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        logger.error(e.getMessage());
    }
//result is the response you get from the remote side
}

Answer 5

為了在 HTML 中正確執行 PUT，您必須用 try/catch 包圍它：

try {
    url = new URL("http://www.example.com/resource");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    httpCon.setDoOutput(true);
    httpCon.setRequestMethod("PUT");
    OutputStreamWriter out = new OutputStreamWriter(
        httpCon.getOutputStream());
    out.write("Resource content");
    out.close();
    httpCon.getInputStream();
} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (ProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 6

UrlConnection 是一個很難使用的 API。 HttpClient 是迄今為止更好的 API，它可以讓您免於浪費時間搜索如何實現某些事情，例如這個 stackoverflow 問題完美地說明了這一點。 我在幾個 REST 客戶端中使用了 jdk HttpUrlConnection 之后寫了這個。 此外，當談到可擴展性功能（如線程池、連接池等）時，HttpClient 更勝一籌

Answer 7

甚至休息模板也可以是一個選項：

String payload = "<?xml version=\"1.0\" encoding=\"UTF-8\"?<RequestDAO>....";
    RestTemplate rest = new RestTemplate();

    HttpHeaders headers = new HttpHeaders();
    headers.add("Content-Type", "application/xml");
    headers.add("Accept", "*/*");
    HttpEntity<String> requestEntity = new HttpEntity<String>(payload, headers);
    ResponseEntity<String> responseEntity =
            rest.exchange(url, HttpMethod.PUT, requestEntity, String.class);

     responseEntity.getBody().toString();

Answer 8

有一種簡單的刪除和放置請求的方法，您可以簡單地通過在您的發布請求中添加“ _method ”參數並為其值寫入“ PUT ”或“ DELETE ”來實現！

Answer 9

我會推薦 Apache HTTPClient。

• 如何做一個 PUT。
• 如何做一個刪除。