springMVC、httpClient调用别人提供的接口。

package utils;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import org.apache.http.HttpEntity;

import org.apache.http.HttpHost;

import org.apache.http.HttpResponse;

import org.apache.http.auth.AuthScope;

import org.apache.http.client.AuthCache;

import org.apache.http.client.CredentialsProvider;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.protocol.HttpClientContext;

import org.apache.http.client.utils.HttpClientUtils;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.BasicAuthCache;

import org.apache.http.impl.client.BasicCredentialsProvider;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

public class HttpClientUtil {

private static final String ITIL_URL = "172.20.32.32";

    private static final int ITIL_PORT = 9999;

    private static final String ITIL_PROTOCOL = "http";

@SuppressWarnings("deprecation")
public static String callingInterface(String jsonParams, String apiUrl) {

        CloseableHttpClient httpclient = HttpClients.createDefault();

        HttpClientContext  context = HttpClientContext.create();

        HttpHost targetHost = new HttpHost(ITIL_URL, ITIL_PORT, ITIL_PROTOCOL);

        //认证提供者

        CredentialsProvider credsProvider = new BasicCredentialsProvider();

        credsProvider.setCredentials(new AuthScope(targetHost.getHostName(), targetHost.getPort()), null);

        AuthCache authCache = new BasicAuthCache();

        context.setCredentialsProvider(credsProvider);

        context.setAuthCache(authCache);

        String url = ITIL_PROTOCOL+"://"+ITIL_URL+":"+ITIL_PORT+apiUrl;

        HttpPost httpPost = new HttpPost(url);

        StringEntity stringEntity = new StringEntity(jsonParams, "UTF-8");

        //设置请求参数

        httpPost.setEntity(stringEntity);

        BufferedReader reader = null;

        StringBuffer sb = new StringBuffer();

        try {

            HttpResponse response = httpclient.execute(targetHost, httpPost, context);

            System.out.println("status="+response.getStatusLine().getStatusCode());

            if(response.getStatusLine().getStatusCode() == 200){ //请求和响应都成功了

                //调用HttpResponse的getEntity()方法可获取HttpEntity对象，该对象包装了服务器的响应内容。程序可通过该对象获取服务器的响应内容。

                HttpEntity entity = response.getEntity();

                reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));

                String buffer  = "";

                while((buffer = reader.readLine()) != null){

                    sb.append(buffer);

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        }finally{

            try {

                if(reader != null){

                    reader.close();

                }

                httpPost.releaseConnection();

                httpclient.getConnectionManager().shutdown();

                HttpClientUtils.closeQuietly(httpclient);

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return sb.toString();

    }

}