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httpclient模擬post請(qǐng)求json封裝表單數(shù)據(jù)的實(shí)現(xiàn)方法

更新時(shí)間：2016年12月31日 10:41:27 投稿：jingxian

下面小編就為大家?guī)?lái)一篇httpclient模擬post請(qǐng)求json封裝表單數(shù)據(jù)的實(shí)現(xiàn)方法。小編覺(jué)得挺不錯(cuò)的，現(xiàn)在就分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

廢話不說(shuō)上代碼：

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(wèn)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(guò)request.getParameter(”string“)直接獲取到屬性值。就是相比json這種要簡(jiǎn)單一點(diǎn)，不過(guò)在實(shí)際開(kāi)發(fā)中一般都是用json做數(shù)據(jù)傳輸?shù)?。用json的話有兩種選擇一個(gè)是阿里巴巴的fastjson還有一個(gè)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(lái)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。

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(jiǎn)陋，只是用于測(cè)試。希望能夠有所收獲。

以上就是小編為大家?guī)?lái)的httpclient模擬post請(qǐng)求json封裝表單數(shù)據(jù)的實(shí)現(xiàn)方法全部?jī)?nèi)容了，希望大家多多支持腳本之家~

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