httpUtil使用

1.httputil工具类

import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLDecoder;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;/**  *  * @project baidamei * @author cevencheng <[e-mail]> * @create 2012-11-17 下午2:35:38 */public class HttpUtil {   /**    * Send a get request    * @param url    * @return response    * @throws IOException     */   static public String get(String url) throws IOException {      return get(url, null);   }   /**    * Send a get request    * @param url         Url as string    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String get(String url,         Map<String, String> headers) throws IOException {      return fetch("GET", url, null, headers);   }   /**    * Send a post request    * @param url         Url as string    * @param body        Request body as string    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String post(String url, String body,         Map<String, String> headers) throws IOException {      return fetch("POST", url, body, headers);   }   /**    * Send a post request    * @param url         Url as string    * @param body        Request body as string    * @return response   Response as string    * @throws IOException     */   static public String post(String url, String body) throws IOException {      return post(url, body, null);   }   /**    * Post a form with parameters    * @param url         Url as string    * @param params      map with parameters/values    * @return response   Response as string    * @throws IOException     */   static public String postForm(String url, Map<String, String> params)          throws IOException {      return postForm(url, params, null);   }   /**    * Post a form with parameters    * @param url         Url as string    * @param params      Map with parameters/values    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String postForm(String url, Map<String, String> params,         Map<String, String> headers) throws IOException {      // set content type      if (headers == null) {         headers = new HashMap<String, String>();      }      headers.put("Content-Type", "application/x-www-form-urlencoded");      // parse parameters      String body = "";      if (params != null) {         boolean first = true;         for (String param : params.keySet()) {            if (first) {               first = false;            }            else {               body += "&";            }            String value = params.get(param);            body += URLEncoder.encode(param, "UTF-8") + "=";            body += URLEncoder.encode(value, "UTF-8");         }      }      return post(url, body, headers);   }   /**    * Send a put request    * @param url         Url as string    * @param body        Request body as string    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String put(String url, String body,         Map<String, String> headers) throws IOException {      return fetch("PUT", url, body, headers);   }   /**    * Send a put request    * @param url         Url as string    * @return response   Response as string    * @throws IOException     */   static public String put(String url, String body) throws IOException {      return put(url, body, null);   }      /**    * Send a delete request    * @param url         Url as string    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String delete(String url,         Map<String, String> headers) throws IOException {      return fetch("DELETE", url, null, headers);   }      /**    * Send a delete request    * @param url         Url as string    * @return response   Response as string    * @throws IOException     */   static public String delete(String url) throws IOException {      return delete(url, null);   }      /**    * Append query parameters to given url    * @param url         Url as string    * @param params      Map with query parameters    * @return url        Url with query parameters appended    * @throws IOException     */   static public String appendQueryParams(String url,          Map<String, String> params) throws IOException {      String fullUrl = new String(url);            if (params != null) {         boolean first = (fullUrl.indexOf('?') == -1);         for (String param : params.keySet()) {            if (first) {               fullUrl += '?';               first = false;            }            else {               fullUrl += '&';            }            String value = params.get(param);            fullUrl += URLEncoder.encode(param, "GBK") + '=';            fullUrl += URLEncoder.encode(value, "GBK");         }      }            return fullUrl;   }      /**    * Retrieve the query parameters from given url    * @param url         Url containing query parameters    * @return params     Map with query parameters    * @throws IOException     */   static public Map<String, String> getQueryParams(String url)          throws IOException {      Map<String, String> params = new HashMap<String, String>();         int start = url.indexOf('?');      while (start != -1) {         // read parameter name         int equals = url.indexOf('=', start);         String param = "";         if (equals != -1) {            param = url.substring(start + 1, equals);         }         else {            param = url.substring(start + 1);         }                  // read parameter value         String value = "";         if (equals != -1) {            start = url.indexOf('&', equals);            if (start != -1) {               value = url.substring(equals + 1, start);            }            else {               value = url.substring(equals + 1);            }         }                  params.put(URLDecoder.decode(param, "GBK"),             URLDecoder.decode(value, "GBK"));      }            return params;   }   /**    * Returns the url without query parameters    * @param url         Url containing query parameters    * @return url        Url without query parameters    * @throws IOException     */   static public String removeQueryParams(String url)          throws IOException {      int q = url.indexOf('?');      if (q != -1) {         return url.substring(0, q);      }      else {         return url;      }   }      /**    * Send a request    * @param method      HTTP method, for example "GET" or "POST"    * @param url         Url as string    * @param body        Request body as string    * @param headers     Optional map with headers    * @return response   Response as string    * @throws IOException     */   static public String fetch(String method, String url, String body,         Map<String, String> headers) throws IOException {      // connection      URL u = new URL(url);      HttpURLConnection conn = (HttpURLConnection)u.openConnection();      conn.setConnectTimeout(90000);      conn.setReadTimeout(90000);      // method      if (method != null) {         conn.setRequestMethod(method);      }      // headers      if (headers != null) {         for(String key : headers.keySet()) {            conn.addRequestProperty(key, headers.get(key));         }      }      // body      if (body != null) {         conn.setDoOutput(true);         OutputStream os = conn.getOutputStream();         os.write(body.getBytes());         os.flush();         os.close();      }            // response      InputStream is = conn.getInputStream();      String response = streamToString(is);      is.close();            // handle redirects      if (conn.getResponseCode() == 301) {         String location = conn.getHeaderField("Location");         return fetch(method, location, body, headers);      }            return response;   }      /**    * Read an input stream into a string    * @param in    * @return    * @throws IOException    */   static public String streamToString(InputStream in) throws IOException {      StringBuffer out = new StringBuffer();      byte[] b = new byte[4096];      for (int n; (n = in.read(b)) != -1;) {         out.append(new String(b, 0, n));      }      return out.toString();   }

2.被调用方

@ResponseBody@RequestMapping("/queryProductByBarCode")public JData queryProductByBarCode(HttpServletRequest request) throws Exception{    if(checkParam(request)){        String code = request.getParameter("code");        //解析保存        CloudProductDto cloudProductDto = dubboCloudProductRpcService.queryProductByBarCode(code);        return new JData(ReturnCode.SUCCESS,cloudProductDto);    }else {        return new JData(ReturnCode.SUCCESS,"标识SIGN错误");    }}

/** * 判断参数Sign是否吻合 * @param request * @return * @throws Exception */private boolean checkParam(HttpServletRequest request)  throws Exception{    try {        Map<String,Object> map = new HashMap<String,Object>();        Enumeration paramNames = request.getParameterNames();        while (paramNames.hasMoreElements()) {            String paramName = (String) paramNames.nextElement();            String[] paramValues = request.getParameterValues(paramName);            if (paramValues.length == 1) {                String paramValue = paramValues[0];                if (paramValue.length() != 0) {                    map.put(paramName, paramValue);                }            }        }        if(map.containsKey("sign")){           //如果标识相同            Map map1 = new HashMap();            map1.put("data", request.getParameter("data"));            String token = "show-owen";            String jsons = MD5Util.md5(token);            if(map.get("sign").toString().contains(jsons)){                return true;            }            return false;        }else{            return false;        }    } catch (Exception e) {        throw e;    }}

 

3.调用方写法

Map map = new HashMap();String token = "show-owen";String jsons = MD5Util.md5(token);map.put("sign", jsons);map.put("code", code);HttpUtil httpUtil = new HttpUtil();String result = httpUtil.postForm(“cloudProduct-queryProductByBarCodeUrl=http://127.0.0.1:8080/cloudProductRpcApi/queryProductByBarCode", map);

result返回参数就是请求的结果
 

此就是简单用法