基于http的restFul请求

1.Java 用HTTP的方式发送JSON报文请求

  public String sendPOSTJsonRequest(String path,String query){

     String resp= "";
      HttpURLConnection connection =null;
        try {
         //定义请求地址
            URL url = new URL(path); //url地址

            //打开链接
            connection = (HttpURLConnection) url.openConnection();
            //doInput默认为true，说明可以从服务器获取数据
          //设置是否从httpUrlConnection读入，默认情况下是true;
            connection.setDoInput(true);
            //doOutput默认为false，含义程序不可以从URL拿数据，所有post请求要设置为true
            //设置是否向httpUrlConnection输出，因为这个是post请求，参数要放在
            //http正文内，因此需要设为true, 默认情况下是false;
            connection.setDoOutput(true);
            //请求方式
            connection.setRequestMethod("POST");
            //Post 请求不能使用缓存
            connection.setUseCaches(false);
            //要在HttpURLConnection实例化之前设置HttpURLConnection.setFollowRedirects(false)。
            //setFollowRedirects()是静态方法，设置为false后后面实例化的HttpURLConnection对象
            //才不会发生重定向，如果在setFollowRedirects()设置为false之前就得到HttpURLConnection对象，
            //则该对象的setFollowRedirects()为默认的true。看来setFollowRedircts()的顺序很重要。
            connection.setInstanceFollowRedirects(true);
            //获取 request 中用POST方式"Content-type"是"application/json"发送的 json 数据
            connection.setRequestProperty("Content-Type","application/json");
            //链接
            connection.connect();
           
            //post参数的方法
            //此处getOutputStream会隐含的进行connect(即：如同调用上面的connect()方法，
            try (OutputStream os = connection.getOutputStream()) {
             //向对象输出流写出数据，这些数据将存到内存缓冲区中
                os.write(query.getBytes("UTF-8"));
            }

            try (BufferedReader reader = new BufferedReader(
                    new InputStreamReader(connection.getInputStream()))) {
                String lines;
                StringBuffer sbf = new StringBuffer();
                while ((lines = reader.readLine()) != null) {
                    lines = new String(lines.getBytes(), "utf-8");
                    sbf.append(lines);
                }
                resp = sbf.toString();   
              
            }
           
           return resp;
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            if(connection != null){
             connection.disconnect();
            }
          
        }
     return resp;
  }     
      

2.Java 用HTTP的方式发送get报文请求

   public boolean sendGETRequest(String path,
            Map<String, String> params, String encoding) throws Exception {
            StringBuilder url = new StringBuilder(path);
            url.append("?");
            for (Map.Entry<String, String> entry : params.entrySet()) {
                   url.append(entry.getKey()).append("=");
                   url.append(URLEncoder.encode(entry.getValue(), encoding));// 编码
                   url.append('&');
             }
            url.deleteCharAt(url.length() - 1);
           HttpURLConnection connection = (HttpURLConnection) new URL(url.toString()).openConnection();
           connection.setConnectTimeout(5000);
           connection.setRequestMethod("GET");
           if (connection.getResponseCode() == 200) {
              return true;
          }
         return false;
     }

 

3.通过通过HttpClient框架发送POST请求

   /**

     * 通过HttpClient框架发送POST请求
     * HttpClient该框架已经集成在android开发包中
     * 此框架封装了很多的工具类，性能比不上自己手写的下面两个方法
     * 但是该方法可以提高程序员的开发速度，降低开发难度
     */
    private static boolean sendHttpClientPOSTRequest(String path,
            Map<String, String> params, String encoding) throws Exception {
        List<NameValuePair> pairs = new ArrayList<NameValuePair>();// 存放请求参数
        if (params != null && !params.isEmpty()) {
            for (Map.Entry<String, String> entry : params.entrySet()) {
                //BasicNameValuePair实现了NameValuePair接口
                pairs.add(new BasicNameValuePair(entry.getKey(), entry
                        .getValue()));
            }
        }
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding);    //pairs:请求参数   encoding:编码方式
        HttpPost httpPost = new HttpPost(path); //path:请求路径
        httpPost.setEntity(entity);

 

        DefaultHttpClient client = new DefaultHttpClient(); //相当于浏览器
        HttpResponse response = client.execute(httpPost);  //相当于执行POST请求
        //取得状态行中的状态码
        if (response.getStatusLine().getStatusCode() == 200) {
            return true;
        }
        return false;
    }

 

 

4.参数以xml放入

 public static boolean sendXML(String path, String xml)throws Exception  

    {  

        byte[] data = xml.getBytes();  

        URL url = new URL(path);  

        HttpURLConnection conn = (HttpURLConnection)url.openConnection();  

        conn.setRequestMethod("POST");  

        conn.setConnectTimeout(5 * 1000);  

        //如果通过post提交数据，必须设置允许对外输出数据  

        conn.setDoOutput(true);  

        conn.setRequestProperty("Content-Type", "text/xml; charset=UTF-8");  

        conn.setRequestProperty("Content-Length", String.valueOf(data.length));  

        OutputStream outStream = conn.getOutputStream();  

        outStream.write(data);  

        outStream.flush();  

        outStream.close();  

        if(conn.getResponseCode()==200)  

        {  

            return true;  

        }  

        return false;  

    }  

 

 jar:

 

 

 

学习来源：https://blog.csdn.net/minzhimo4854/article/details/88925461

                  https://www.cnblogs.com/zjshd/p/9149643.html

                  https://www.cnblogs.com/wang-yaz/p/9237981.html

                  https://www.cnblogs.com/longshiyVip/p/5066285.html

                  https://www.cnblogs.com/lukelook/p/11169219.html

                  http://www.voidcn.com/article/p-xifhsqww-ys.html

                  https://blog.csdn.net/qq_26819733/article/details/52752170

                  https://vimsky.com/examples/detail/java-method-java.net.HttpURLConnection.setDefaultUseCaches.html

                  https://wenku.baidu.com/view/48f3c5d226fff705cc170ad1.html

                  https://ask.csdn.net/questions/243757

                  //获取 request 中用POST方式"Content-type"是"application/json"发送的 json 数据

                  https://blog.csdn.net/seapeak007/article/details/70320199

                  //post 的json请求

                  https://www.cnblogs.com/wqsbk/p/6771045.html

                //jar

                https://blog.csdn.net/mhqyr422/article/details/79787518

                //前段构建请求

                https://my.oschina.net/u/3970421/blog/3055110

                //理论

                https://www.jianshu.com/p/21622d81ab26

               //JSON数据交互和RESTful支持

 

               https://blog.csdn.net/qq_37820491/article/details/89682923

                //基于不同框架的实现

               https://zhuanlan.zhihu.com/p/69285935

                https://cloud.tencent.com/developer/article/1552692

                https://blog.csdn.net/beijing20110905/article/details/17508177

                 //发送xml

                https://blog.csdn.net/Roben518/article/details/52247970