跨域post

两种方法：
一种是httpclient
一种是httpurlconnection

package com.networkbench.newlens.alarm.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.ObjectOutputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.apache.commons.lang.StringUtils;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicHeader;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import ch.ethz.ssh2.crypto.Base64;import com.alibaba.fastjson.JSONObject;import com.google.common.net.MediaType;/** * 用于调用ows接口 * @author Administrator * */public class HttpClientUtil {    private static Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);    /**     *发送post请求     */    public static void post(JSONObject jsonObject,String method){//      String url = "http://localhost:8080/tingyun-qy-report-server/apm/alarm/synchronize/list?start=0&limit=10"//              + "&orderBy=null&asc=true";        String url = "";        if(ZQZT.loadProperties("conf.local/conf-deploy.properties")){            url = ZQZT.getParam("newlens.alarm.owsservice_url");        }else{            logger.info("读取配置文件失败");        }        if(!StringUtils.isBlank(url)){            if(method.equals("insert")){                url=url+"v1/ai_alarm_status";                method="POST";            }else {                url=url+"rest/alarm-receive/v1/alarm-receive-services ";                method="PUT";            }            try {                //创建链接                HttpURLConnection connection = getConnection(url,method);                OutputStream outputStream = connection.getOutputStream();                //发送数据                //String param = "name=nb&password=TingYun@2016";                outputStream.write(jsonObject.toString().getBytes());                outputStream.flush();                outputStream.close();                 //判断响应码                if (connection.getResponseCode() != 200) {                    logger.info("http链接失败。。。。");                }                dealWithResp(connection);                //释放链接                connection.disconnect();            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();                logger.info("" + e.getMessage());            }        }else {            logger.error("获取   url 地址  为空！！！！！");        }    }    /**     * 创建HttpURLConnection链接     * @param url     * @return     */    public static HttpURLConnection getConnection(String url,String method){        try {            URL url2 = new URL(url);            HttpURLConnection httpURLConnection = (HttpURLConnection) url2.openConnection();            //打开可以向服务器发送消息            httpURLConnection.setDoOutput(true);            //设置请求方式            httpURLConnection.setRequestMethod(method);            //设置请求头            httpURLConnection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");            httpURLConnection.setRequestProperty("Accept", "application/json");            httpURLConnection.setRequestProperty("Server", "example-server");            httpURLConnection.setRequestProperty("Authorization", "Basic YXBtX3N5c3RlbTpQYXNzd29yZC4xMjM0NTY=");            return httpURLConnection;        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();            logger.info("创建httpUrlConnection 失败 ： " + e.getMessage());        }        return null;    }    /**     * 处理响应数据     * @param connection     */    public static void dealWithResp(HttpURLConnection connection){        //获取相应数据        try {            String line = null;            BufferedReader responseBuffer = new BufferedReader(new InputStreamReader((connection.getInputStream())));            while ((line = responseBuffer.readLine()) != null) {                logger.info("########################## : "+line);            }        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();            logger.info("获取响应数据错误 ： " + e.getMessage());        }    }    public static void testHttpClient(){        HttpClient httpClient = new DefaultHttpClient();        HttpPost httpPost = new HttpPost("url");        httpPost.setHeader("Content-type","application/json; charset=utf-8");          httpPost.setHeader("Accept", "application/json");        httpPost.setHeader("Accept", "application/json");        httpPost.setHeader("Authorization","Basic dGluZ3l1bnRlc3QwOTExOkh1YXdlaUAxMjM0NQ==");        JSONObject jsonParam = new JSONObject();          jsonParam.put("User Name", "apm_system");        jsonParam.put("Password", "Password.123456");        String result="";        try {            StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");            httpPost.setEntity(entity);            HttpResponse response = httpClient.execute(httpPost);            if(response != null){                  HttpEntity resEntity = response.getEntity();                  if(resEntity != null){                      result = EntityUtils.toString(resEntity,"utf-8");                  }              }            //获取响应码            int statusCode = response.getStatusLine().getStatusCode();            logger.info("result : "+result);            logger.info("result statusCode : " + statusCode);        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }//    private String getFromBASE64(String s) {  //        Base64.encode((username + ":" + password).getBytes());//    }     public static void main(String[] args) {        JSONObject jsonObject = new JSONObject();        jsonObject.put("start", 0);        jsonObject.put("limit", 1);        jsonObject.put("orderBy", "firstoccurrence");        jsonObject.put("asc", true);        char[] encode = Base64.encode(("tingyuntest0911" + ":" + "Huawei@12345").getBytes());        System.out.println(encode);//      post(jsonObject,"insert");//      testHttpClient();//      String url = "http://localhost:8080/tingyun-qy-report-server/apm/alarm/synchronize/list?start=0&limit=10";//      HttpURLConnection connection = getConnection(url);//      dealWithResp(connection);    }}

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注：下面的代码是抄袭别人的。哈哈。。。
问题：在微服务框架之外的系统中，我们经常会遇到使用httpClient进行接口调用的问题，除了进行白名单的设置，很多时候我们需要在接口调用的时候需要身份认证。翻了一下官方文档，解决方法很多，但是都不太符合实际业务场景，这里提供一种简单粗暴的解决方法。

解决方法：利用请求头，将验证信息保存起来。

public class HttpClientUtils {    protected static final Logger LOG = LoggerFactory.getLogger(HttpClientUtils.class);    private static final String AUTHENKEY = "Authorization";    private static final String BASICKEY = "Basic ";    public static  String  getConnect(String url,String username,String password) {        CloseableHttpResponse response = null;        CloseableHttpClient client = HttpClients.createDefault();        HttpGet httpGet = new HttpGet(url);        Base64 token = new Base64();        String authenticationEncoding = token.encodeAsString(new String(username + ":" + password).getBytes());        httpGet.setHeader(AUTHENKEY, BASICKEY + authenticationEncoding);        String responseContent = "";        try {            response = client.execute(httpGet);            HttpEntity entity = response.getEntity();            responseContent = EntityUtils.toString(entity, "UTF-8");        } catch (IOException e) {            LOG.error(e.toString());        } finally {            if (response != null) {                try {                    response.close();                } catch (IOException e) {                    LOG.error(e.toString());                }            }            if (client != null) {                try {                    client.close();                } catch (IOException e) {                    LOG.error(e.toString());                }            }        }        return responseContent;    }}