廢話不說上代碼：
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public static String httpPostWithJSON(String url) throws Exception { HttpPost httpPost = new HttpPost(url); CloseableHttpClient client = HttpClients.createDefault(); String respContent = null; // json方式 JSONObject jsonParam = new JSONObject(); jsonParam.put("name", "admin"); jsonParam.put("pass", "123456"); StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");//解決中文亂碼問題 entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); System.out.println(); // 表單方式// List<BasicNameValuePair> pairList = new ArrayList<BasicNameValuePair>(); // pairList.add(new BasicNameValuePair("name", "admin"));// pairList.add(new BasicNameValuePair("pass", "123456"));// httpPost.setEntity(new UrlEncodedFormEntity(pairList, "utf-8")); HttpResponse resp = client.execute(httpPost); if(resp.getStatusLine().getStatusCode() == 200) { HttpEntity he = resp.getEntity(); respContent = EntityUtils.toString(he,"UTF-8"); } return respContent; } public static void main(String[] args) throws Exception { String result = httpPostWithJSON("http://localhost:8080/hcTest2/Hc"); System.out.println(result); } |
post方式 就要考慮提交的表單內(nèi)容怎么傳輸了。本文name和pass就是表單的值了。
封裝表單屬性可以用json也可以用傳統(tǒng)的表單，如果是傳統(tǒng)表單的話 要注意，也就是在上邊代碼注釋那部分。用這種方式的話在servlet里也就是數(shù)據(jù)處理層可以通過request.getParameter(”string“)直接獲取到屬性值。就是相比json這種要簡單一點(diǎn)，不過在實(shí)際開發(fā)中一般都是用json做數(shù)據(jù)傳輸?shù)摹Ｓ胘son的話有兩種選擇一個是阿里巴巴的fastjson還有一個就是谷歌的gson。fastjson相比效率比較高，gson適合解析有規(guī)律的json數(shù)據(jù)。博主這里用的是fastjson。還有用json的話在數(shù)據(jù)處理層要用流來讀取表單屬性，這就是相比傳統(tǒng)表單多的一點(diǎn)內(nèi)容。代碼下邊已經(jīng)有了。
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public class HcServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); String acceptjson = ""; User user = new User(); BufferedReader br = new BufferedReader(new InputStreamReader( (ServletInputStream) request.getInputStream(), "utf-8")); StringBuffer sb = new StringBuffer(""); String temp; while ((temp = br.readLine()) != null) { sb.append(temp); } br.close(); acceptjson = sb.toString(); if (acceptjson != "") { JSONObject jo = JSONObject.parseObject(acceptjson); user.setUsername(jo.getString("name")); user.setPassword(jo.getString("pass")); } request.setAttribute("user", user); request.getRequestDispatcher("/message.jsp").forward(request, response); }} |
代碼比較簡陋，只是用于測試。希望能夠有所收獲。
以上就是小編為大家?guī)淼?a href="/article/79040.html">httpclient模擬post請求json封裝表單數(shù)據(jù)的實(shí)現(xiàn)方法全部內(nèi)容了，希望大家多多支持服務(wù)器之家~
