java实现发送get/post请求并携带参数

package ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import ; import org.; import org.; import .*; import ; import .*; /** * http请求工具 */ public class HttpUtil { // private static final Logger logger = (); /** * 发送post请求携带json数据 * @param URL * @param json * @param headerMap * @return */ public static String sendPostJson(String URL, JSONObject json, HashMap<String,String> headerMap) { CloseableHttpClient client = (); HttpPost post = new HttpPost(URL); Iterator<<String, String>> iterator = ().iterator(); while (()) { <String, String> next = (); ((),()); } String result; try { StringEntity s = new StringEntity((), "utf-8"); (new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); (s); // 发送请求 HttpResponse httpResponse = (post); (().toString()); // 获取响应输入流 InputStream inStream = ().getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader( inStream, "utf-8")); StringBuilder strber = new StringBuilder(); String line; while ((line = ()) != null) (line + "\n"); (); result = (); if (().getStatusCode() == HttpStatus.SC_OK) { ("请求服务器成功，做相应处理"); } else { ("请求服务端失败"); } } catch (Exception e) { throw new RuntimeException(e); } return result; } /** * @param url 访问地址 * @param headerMap header 参数；可以通过下面工具类将string类型转换成map * @param contentMap 需要传输参数参数；对象可以通过json转换成map * @return 返回网页返回的数据 */ public static String sendPostForm(String url, Map<String, String> headerMap, Map<String, String> contentMap) { String result = null; CloseableHttpClient httpClient = (); HttpPost post = new HttpPost(url); // 设置请求头 // ("Content-Type", "application/x-www-form-urlencoded"); List<NameValuePair> content = new ArrayList<NameValuePair>(); //将content生成entity Iterator iterator = ().iterator(); while (()) { <String, String> elem = (<String, String>) (); (new BasicNameValuePair((), ())); } CloseableHttpResponse response = null; try { //循环增加header Iterator headerIterator = ().iterator(); while (()) { <String, String> elem = (<String, String>) (); ((), ()); } if (() > 0) { UrlEncodedFormEntity entity = new UrlEncodedFormEntity(content, "UTF-8"); (entity); } //发送请求并接收返回数据 response = (post); if (response != null && ().getStatusCode() == 200) { //获取response的body部分 HttpEntity entity = (); //读取reponse的body部分并转化成字符串 result = (entity); } return result; } catch (UnsupportedEncodingException e) { (); } catch (ClientProtocolException e) { (); } catch (IOException e) { (); } finally { try { (); if (response != null) { (); } } catch (IOException e) { (); } } return null; } /** * 发送get请求 * @param url 请求URL * @param param 请求参数 key:value url携带参数 或者无参可不填 * @return */ public static String doGet(String url, Map<String, String> param) { // 创建Httpclient对象 CloseableHttpClient httpclient = (); String resultString = ""; CloseableHttpResponse response = null; try { // 创建uri URIBuilder builder = new URIBuilder(url); if (param != null) { for (String key : ()) { (key, (key)); } } URI uri = (); // 创建http GET请求 HttpGet httpGet = new HttpGet(uri); // 执行请求 response = (httpGet); // 判断返回状态是否为200 if (().getStatusCode() == 200) { resultString = ((), "UTF-8"); } } catch (Exception e) { (); } finally { try { if (response != null) { (); } (); } catch (IOException e) { (); } } return resultString; } }