如何在java中的http post中发送json对象
我想发送一个JSON对象（注意它不应该转换为字符串，因为服务器端代码基于Spring启动项目并且有params（@RequestBody PCAP pcap））我有我的下面的代码但它转换为正文到一个字符串，给我400个不良请求。
private void sendData(String ip){ try{ JSONObject json=new JSONObject(); json.put("time_range", "22-23"); json.put("flow_id", "786"); json.put("ip_a", "192.65.78.22"); json.put("port_a", "8080"); json.put("regex", "%ab"); URL url=new URL("http://"+ip+":8080/pcap"); HttpURLConnection httpcon=(HttpURLConnection)url.openConnection(); httpcon.setDoOutput(true); httpcon.setRequestMethod("POST"); httpcon.setRequestProperty("Accept", "application/json"); httpcon.setRequestProperty("Content-Type", "application/json"); Cookie cookie=new Cookie("user", "abc"); cookie.setValue("store"); httpcon.setRequestProperty("Accept", "application/json"); httpcon.setRequestProperty("Cookie", cookie.getValue()); OutputStreamWriter output=new OutputStreamWriter(httpcon.getOutputStream()); System.out.println(json); output.write(json.toString()); httpcon.connect(); String output1=httpcon.getResponseMessage(); System.out.println(output1); }catch(Exception e){ } } 注意：服务器端代码是
@RequestMapping(value = URIConstansts.PCAP, produces = { "application/json" }, method = RequestMethod.POST) public ResponseEntity getPcap(HttpServletRequest request,@RequestBody PcapParameters pcap_params )
这是你需要做的：
- 获取Apache HttpClient，这将使您能够提出所需的请求
- 用它创建一个HttpPost请求并添加标题“application / x-www-form-urlencoded”
- 创建一个StringEntity，您将JSON传递给它
- 执行通话
代码大致看起来像（你仍然需要调试它并让它工作）
HttpClient httpClient = new DefaultHttpClient(); //Deprecated HttpClient httpClient = HttpClientBuilder.create().build(); //Use this instead try { HttpPost request = new HttpPost("http://yoururl"); StringEntity params =new StringEntity("details={\"name\":\"myname\",\"age\":\"20\"} "); request.addHeader("content-type", "application/x-www-form-urlencoded"); request.setEntity(params); HttpResponse response = httpClient.execute(request); // handle response here... }catch (Exception ex) { // handle exception here } finally { httpClient.getConnectionManager().shutdown(); //Deprecated }
我更喜欢在HttpClient上继续使用HttpURLConnection。 关于优势的一些评论可以在这个SE问题中找到
output.write(json.toString());
应该改为
byte[] jsonBytes = json.getBytes("UTF-8"); output.write(jsonBytes); output.flush();
在写入对象之后不要忘记调用flush（），并且在写入操作之前应该指示UTF-8格式。