HTTP收收的数占有二种体例，1种是GET要求，1种是POST恳求，GET吁请便是复杂的URL拼交参数，收收的参数少度也无限造。

而POST的参数能够建树正在FORM中，参数少度也能够知足年夜多诉求，不常从效劳器的职能上思量，预防歹意的GET实验，好多交心皆是限定POST体例的。

那末POST苦求收收参数来讲经常使用也有二种体例，1种是拼交参数战GET一致，然则收收体例指定为POST。

收收的数据没有共，也能够正在头长进止指定，那里的示例鉴于HttpClient（相干先容参照：HttpClients停载取初学）。

那里也写个复杂GET央求：

/***Get申请*/publicstaticStringHttpGet(Stringurl)throwsException{StringjsonString="";HttpClientclient=newHttpClient(newHttpClientParams(),newSimpleHttpConnectionManager(true));client.getHttpConnectionManager().getParams().setConnectionTimeout(15000);//经由过程收集取效劳器创立毗连的超常常间client.getHttpConnectionManager().getParams().setSoTimeout(60000);//Socket读数据的超不时间，便从效劳器获得呼应数据须要等候的技术GetMethodmethod=newGetMethod(url);method.setRequestHeader("Content-Type","text/html;charset=UTF-8");try{client.executeMethod(method);jsonString=method.getResponseBodyAsString();}catch(Exceptione){jsonString="error";logger.error("HTTP乞请途径时缺陷："+url,e.getMessage());throwe;//同常中扔}finally{if(null!=method)method.releaseConnection();}returnjsonString;}

POST乞请尔们应用URLConnection去写：

publicstaticStringsendPost(Stringurl,Stringparam)throwsException{PrintWriterout=null;BufferedReaderin=null;Stringresult="";try{URLrealUrl=newURL(url);URLConnectionconn=realUrl.openConnection();conn.setConnectTimeout(5000);conn.setReadTimeout(10*1000);conn.setDoOutput(true);//收收POST哀求必需树立以下二止conn.setDoInput(true);out=newPrintWriter(conn.getOutputStream());out.print(param);out.flush();in=newBufferedReader(newInputStreamReader(conn.getInputStream()));Stringline;while((line=in.readLine())!=null){result+=line;}}catch(Exceptione){logger.error("HTTP乞请途径时缺陷："+url,e.getMessage());throwe;//同常中扔}finally{try{if(out!=null)out.close();if(in!=null)in.close();}catch(Exceptionex){}}returnresult;}

此时，统一个毗连，移用没有共的办法，便是没有共的收收体例。

效劳器端接纳的话能够参照如许，鉴于SpringMVC的写法：

@SuppressWarnings({"unchecked"})@RequestMapping(value="/testPost2",method=RequestMethod.POST)publicResponseEntity<String>testPost2(HttpServletRequestreq,HttpServletResponseres,@RequestParam(value="postXML")StringpostXML)throwsException{System.out.println(postXML);DocumentdocRe=DocumentHelper.createDocument();ElementSyncAppOrderResp=docRe.addElement("reXML").addNamespace("","http://www.javacui.com/xml/schemas/");SyncAppOrderResp.addElement("status").addText("0");returnnewResponseEntity(docRe.asXML(),HttpStatus.OK);}

以上的写法，POST的参数是鉴于KEY战VALUE体例的，另有1种广泛干法是把参数XML曲交写正在头前里。

此时的写法便是把要收收的参数写正在RequestBody内中，施行收收的内乱容是鉴于甚么花样的，比方底下的示例，平凡收收，JSON战XML：

/***平凡POST仰求*/@SuppressWarnings("deprecation")publicstaticStringHttpPost(Stringurl,Stringbody)throwsException{StringjsonString="";HttpClientclient=newHttpClient(newHttpClientParams(),newSimpleHttpConnectionManager(true));client.getHttpConnectionManager().getParams().setConnectionTimeout(15000);//经由过程收集取效劳器创立毗连的超常常间client.getHttpConnectionManager().getParams().setSoTimeout(60000);//Socket读数据的超每每间，便从效劳器获得呼应数据须要等候的工夫PostMethodmethod=newPostMethod(url);method.setRequestHeader("Content-Type","text/html;charset=UTF-8");method.setRequestBody(body);try{client.executeMethod(method);jsonString=method.getResponseBodyAsString();}catch(Exceptione){jsonString="error";logger.error("HTTP要求途径时缺点："+url,e.getMessage());throwe;//同常中扔}finally{if(null!=method)method.releaseConnection();}returnjsonString;}/***JSON的POST苦求*/@SuppressWarnings("deprecation")publicstaticStringHttpPostJSON(Stringurl,JSONObjectbody)throwsException{StringjsonString="";HttpClientclient=newHttpClient(newHttpClientParams(),newSimpleHttpConnectionManager(true));client.getHttpConnectionManager().getParams().setConnectionTimeout(15000);//经由过程收集取效劳器创立毗连的超常常间client.getHttpConnectionManager().getParams().setSoTimeout(60000);//Socket读数据的超往往间，便从效劳器获得呼应数据须要期待的年华client.getHttpConnectionManager().getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"UTF-8");PostMethodmethod=newPostMethod(url);method.setRequestHeader("Content-Type","application/json;charset=UTF-8");method.setRequestBody(body.toString());try{client.executeMethod(method);jsonString=method.getResponseBodyAsString();}catch(Exceptione){jsonString="error";logger.error("HTTP吁请途径时缺点："+url,e.getMessage());throwe;//同常中扔}finally{if(null!=method)method.releaseConnection();}returnjsonString;}/***XML的POST吁请*/@SuppressWarnings("deprecation")publicstaticStringHttpPostXml(Stringurl,StringxmlBody)throwsException{Stringresult="";HttpClientclient=newHttpClient(newHttpClientParams(),newSimpleHttpConnectionManager(true));client.getHttpConnectionManager().getParams().setConnectionTimeout(15000);//经由过程收集取效劳器创立毗连的超经常间client.getHttpConnectionManager().getParams().setSoTimeout(60000);//Socket读数据的超每每间，便从效劳器获得呼应数据须要守候的时辰PostMethodmethod=newPostMethod(url);method.setRequestHeader("Content-Type","application/xml");if(null!=xmlBody){method.setRequestBody(xmlBody);}try{client.executeMethod(method);result=method.getResponseBodyAsString();}catch(Exceptione){result="error";logger.error("HTTP哀告途径时故障："+url,e.getMessage());throwe;//同常中扔}finally{if(null!=method)method.releaseConnection();}returnresult;}

而效劳器端接纳时，便须要重新中获得参数，代码参照：

@SuppressWarnings({"unchecked"})@RequestMapping(value="/testPost1",method=RequestMethod.POST)publicResponseEntity<String>testPost1(HttpServletRequestreq,HttpServletResponseres)throwsException{BufferedReaderbufferReader=req.getReader();//获得头部参数疑息StringBufferbuffer=newStringBuffer();Stringline="";while((line=bufferReader.readLine())!=null){buffer.append(line);}StringpostData=buffer.toString();System.out.println(postData);DocumentdocRe=DocumentHelper.createDocument();ElementSyncAppOrderResp=docRe.addElement("reXML").addNamespace("","http://www.javacui.com/xml/schemas/");SyncAppOrderResp.addElement("status").addText("0");returnnewResponseEntity(docRe.asXML(),HttpStatus.OK);}

testPost1战testPost2那二种体例，尔们能够写1个MAIN去尝试：

publicstaticvoidmain(String[]args){try{System.out.println(HttpPostXml("http://localhost:8008/api/testPost1","<?xmlversion=\"1.0\"encoding=\"UTF-8\"?><root><status>1</status></root>"));System.out.println(sendPost("http://localhost:8008/api/testPost2","postXML=<?xmlversion=\"1.0\"encoding=\"UTF-8\"?><root><status>1</status></root>"));}catch(Exceptione){e.printStackTrace();}}

收收接纳的皆是XML参数，收收战接纳挨印正在操纵台。

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