java http請求get與post

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　　先放一個串連　　http://www.techweb.com.cn/network/system/2016-10-11/2407736.shtml

 

　　然後貼代碼

　　

　　

public void sendGet(String reqUrl, String params, String contentType) throws Exception {        StringBuffer result = new StringBuffer();        BufferedReader reader;        URLConnection conn;        URL url = new URL(reqUrl);        conn = url.openConnection();        conn.setRequestProperty("accept", contentType);        conn.setRequestProperty("content-type", contentType);        conn.setRequestProperty("connection", "keep-live");        //conn.setRequestProperty("authorization", "Bearer " + this.token);        conn.connect();        Map<String, List<String>> map = conn.getHeaderFields();        for (String key : map.keySet()) {                   System.out.println(key + "--->" + map.get(key));                }        reader = new BufferedReader(new     InputStreamReader(conn.getInputStream()));        String line;        while ((line = reader.readLine()) != null) {            result.append(line);        }        reader.close();        System.err.println(result);            }            

以上是get方法

public void sendPost(String reqUrl, JSONObject body) throws Exception {        StringBuffer result = new StringBuffer();        PrintWriter writer;        BufferedReader reader;        URLConnection conn;        URL url = new URL(reqUrl);        conn = url.openConnection();        conn.setRequestProperty("accept", "application/vnd.plcm.plcm-recording-info-list+json");        conn.setRequestProperty("content-type", "application/vnd.plcm.plcm-recording-info-list+json");        conn.setRequestProperty("connection", "keep-alive");        //conn.setRequestProperty("user-agent",            //    "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0");        conn.setRequestProperty("Authorization", "Bearer " + this.token);        conn.setDoOutput(true);        conn.setDoInput(true);        writer = new PrintWriter(conn.getOutputStream());        if (body != null) {            writer.write(body.toString());        }        writer.flush();        conn.connect();        Map<String, List<String>> map = conn.getHeaderFields();        for (String key : map.keySet()) {           System.out.println(key + "--->" + map.get(key));        }        reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));        String line;        while ((line = reader.readLine()) != null) {            result.append(line);        }        reader.close();        System.err.println(result.toString());    }

以上是post提交的代碼

（請自動忽略要求標頭裡的accept和content-type）

 

要說的是，之前在發送get請求時，不小心粘貼了

 writer = new PrintWriter(conn.getOutputStream());        if (body != null) {            writer.write(body.toString());        }        writer.flush();
這部分代碼，服務端拋出了415 作為response code
unsupported media type
結合最開始連結，幾乎可以相信，get只發一次包，而post發兩次，通俗的講，假設把一個httprequest看成是有header和body構成的話，get一次將header和body一併發送，而post先發送header，然後再發送body，
這個有待以後驗證。

java http請求get與post