我想知道是否可以通过java.net.HttpURLConnection将PUT，DELETE请求（实际上）发送到基于HTTP的URL。
我已经阅读了很多文章，描述了如何发送GET，POST，TRACE，OPTIONS请求，但我仍然没有找到任何成功执行PUT和DELETE请求的示例代码。
要执行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();
要执行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();
这是它对我有用的方式：
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("DELETE");
int responseCode = connection.getResponseCode();
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;
}
然后在你的代码中：
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
}
我同意@adietisheim和其他建议HttpClient的人。
我花了很多时间尝试使用HttpURLConnection进行简单的休息服务，并且它没有说服我，之后我尝试使用HttpClient，它真的更容易，可以理解和更好。
进行put http调用的代码示例如下：
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);
UrlConnection是一个难以使用的API。 HttpClient是迄今为止更好的API，它将使您免于浪费时间搜索如何实现某些事情，例如stackoverflow问题完全说明。我在几个REST客户端中使用了jdk HttpUrlConnection之后编写了这个。此外，当谈到可伸缩性功能（如线程池，连接池等）时，HttpClient非常出色
要正确执行HTML中的PUT，您必须使用try / catch包围它：
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();
}
我会推荐Apache HTTPClient。
即使是休息模板也可以选择：
String payload = "<?xml version=\"1.0\" encoding=\"UTF-8\"?<CourierServiceabilityRequest>....";
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();
有一个简单的删除和放置请求的方法，你可以通过在你的帖子请求中添加一个“_method”参数并为其值写“PUT”或“DELETE”来做到这一点！