post发送form格式(1)

1、引入相关依赖包
jar包下载：httpcore4.5.5.jar fastjson-1.2.47.jar

1发送form格式application/x-www-form-urlencoded

x-www-form-urlencoded格式里面是正常模式 key1=value1&key2=value2

   public static String sendPost(String curl, String param) {
     

        String result = "";// 返回的结果
        BufferedReader in = null;// 读取响应输入流
        try {
            //创建连接
            URL url = new URL(curl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);// 是否打开outputStream 相对于程序，即我们向远程服务器写入数据，默认为false，不打开
            connection.setDoInput(true); // 输入流，获取到返回的响应内容， 默认为true，所以get请求时可以不设置这个连接信息
            connection.setRequestMethod("POST"); //发送请求的方式
            connection.setUseCaches(false); //不使用缓存
            connection.setInstanceFollowRedirects(true); //重定向，一般浏览器才需要
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8"); //设置服务器解析数据的方式
            connection.setRequestProperty("Cache-Control", "no-cache"); // 禁用缓存
            connection.connect();

            OutputStream out = connection.getOutputStream();
            out.write(param.getBytes());
            out.flush();
            out.close();

            int code = connection.getResponseCode();

            if (code != 200) {
                //读取响应
                // 定义BufferedReader输入流来读取URL的响应,并设置编码方式
                in = new BufferedReader(new InputStreamReader(connection.getErrorStream(), "UTF-8"));
                String line;
                // 读取返回的内容
                while ((line = in.readLine()) != null) {
                    result += line;
                }
            } else {
                //读取响应
                // 定义BufferedReader输入流来读取URL的响应,并设置编码方式
                in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
                String line;
                // 读取返回的内容
                while ((line = in.readLine()) != null) {
                    result += line;
                }

            }
        }
        catch (Exception e) {
            e.printStackTrace();
            System.out.println("Http请求方法内部问题");
        }
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

2发送form格式application/x-www-form-urlencoded

x-www-form-urlencoded格式里面是非正常模式

eg: sql=select * from Certification where id = ‘531663cb5d0f402c80b0826373a6988b&aaa=123’.格式里面有混合进去的&key=value

使用如下:先得到List params1,在调用post方法.

/**
 * HttpClient发送GET、POST请求
 * @Author libin
 * @CreateDate 2018.5.28 16:56
 */
public class HttpClientService {

    private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);
    /**
     * 返回成功状态码
     */
    private static final int SUCCESS_CODE = 200;

    /**
     * 发送GET请求
     * @param url   请求url
     * @param nameValuePairList    请求参数
     * @return JSON或者字符串
     * @throws Exception
     */
    public static Object sendGet(String url, List<NameValuePair> nameValuePairList) throws Exception{
        JSONObject jsonObject = null;
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        try{
            /**
             * 创建HttpClient对象
             */
            client = HttpClients.createDefault();
            /**
             * 创建URIBuilder
             */
            URIBuilder uriBuilder = new URIBuilder(url);
            /**
             * 设置参数
             */
            uriBuilder.addParameters(nameValuePairList);
            /**
             * 创建HttpGet
             */
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            /**
             * 设置请求头部编码
             */
            httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
            /**
             * 设置返回编码
             */
            httpGet.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
            /**
             * 请求服务
             */
            response = client.execute(httpGet);
            /**
             * 获取响应吗
             */
            int statusCode = response.getStatusLine().getStatusCode();

            if (SUCCESS_CODE == statusCode){
                /**
                 * 获取返回对象
                 */
                HttpEntity entity = response.getEntity();
                /**
                 * 通过EntityUitls获取返回内容
                 */
                String result = EntityUtils.toString(entity,"UTF-8");
                /**
                 * 转换成json,根据合法性返回json或者字符串
                 */
                try{
                    jsonObject = JSONObject.parseObject(result);
                    return jsonObject;
                }catch (Exception e){
                    return result;
                }
            }else{
                LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
            }
        }catch (Exception e){
            LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
        } finally {
            response.close();
            client.close();
        }
        return null;
    }

    /**
     * 发送POST请求
     * @param url
     * @param nameValuePairList
     * @return JSON或者字符串
     * @throws Exception
     */
    public static Object sendPost(String url, List<NameValuePair> nameValuePairList) throws Exception{
        JSONObject jsonObject = null;
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        try{
            /**
             *  创建一个httpclient对象
             */
            client = HttpClients.createDefault();
            /**
             * 创建一个post对象
             */
            HttpPost post = new HttpPost(url);
            /**
             * 包装成一个Entity对象
             */
            StringEntity entity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");
            /**
             * 设置请求的内容
             */
            post.setEntity(entity);
            /**
             * 设置请求的报文头部的编码
             */
            post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
            /**
             * 设置请求的报文头部的编码
             */
            post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
            /**
             * 执行post请求
             */
            response = client.execute(post);
            /**
             * 获取响应码
             */
            int statusCode = response.getStatusLine().getStatusCode();
            if (SUCCESS_CODE == statusCode){
                /**
                 * 通过EntityUitls获取返回内容
                 */
                String result = EntityUtils.toString(response.getEntity(),"UTF-8");
                /**
                 * 转换成json,根据合法性返回json或者字符串
                 */
                try{
                    jsonObject = JSONObject.parseObject(result);
                    return jsonObject;
                }catch (Exception e){
                    return result;
                }
            }else{
                LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
            }
        }catch (Exception e){
            LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
        }finally {
            response.close();
            client.close();
        }
        return null;
    }

    /**
     * 组织请求参数{参数名和参数值下标保持一致}
     * @param params    参数名数组
     * @param values    参数值数组
     * @return 参数对象
     */
    public static List<NameValuePair> getParams(Object[] params, Object[] values){
        /**
         * 校验参数合法性
         */
        boolean flag = params.length>0 && values.length>0 &&  params.length == values.length;
        if (flag){
            List<NameValuePair> nameValuePairList = new ArrayList<>();
            for(int i =0; i<params.length; i++){
                nameValuePairList.add(new BasicNameValuePair(params[i].toString(),values[i].toString()));
            }
            return nameValuePairList;
        }else{
            LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 197, "请求参数为空且参数长度不一致");
        }
        return null;
    }


 
}