import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
 
@Configuration
public class RestTemplateConfig {
 
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory factory){
        return new RestTemplate(factory);
    }
 
    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setConnectTimeout(15000);
        factory.setReadTimeout(5000);
        return factory;
    }
}

import com.alibaba.fastjson.JSONObject;
import com.swordfall.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
 
@Service
public class RestTemplateToInterface {
 
    @Autowired
    private RestTemplate restTemplate;
 
    /**
     * 以get方式請(qǐng)求第三方http接口 getForEntity
     * @param url
     * @return
     */
    public User doGetWith1(String url){
        ResponseEntity<User> responseEntity = restTemplate.getForEntity(url, User.class);
        User user = responseEntity.getBody();
        return user;
    }
 
    /**
     * 以get方式請(qǐng)求第三方http接口 getForObject
     * 返回值返回的是響應(yīng)體，省去了我們?cè)偃etBody()
     * @param url
     * @return
     */
    public User doGetWith2(String url){
        User user  = restTemplate.getForObject(url, User.class);
        return user;
    }
 
    /**
     * 以post方式請(qǐng)求第三方http接口 postForEntity
     * @param url
     * @return
     */
    public String doPostWith1(String url){
        User user = new User("小白", 20);
        ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, user, String.class);
        String body = responseEntity.getBody();
        return body;
    }
 
    /**
     * 以post方式請(qǐng)求第三方http接口 postForEntity
     * @param url
     * @return
     */
    public String doPostWith2(String url){
        User user = new User("小白", 20);
        String body = restTemplate.postForObject(url, user, String.class);
        return body;
    }
 
    /**
     * exchange
     * @return
     */
    public String doExchange(String url, Integer age, String name){
        //header參數(shù)
        HttpHeaders headers = new HttpHeaders();
        String token = "asdfaf2322";
        headers.add("authorization", token);
        headers.setContentType(MediaType.APPLICATION_JSON);
 
        //放入body中的json參數(shù)
        JSONObject obj = new JSONObject();
        obj.put("age", age);
        obj.put("name", name);
 
        //組裝
        HttpEntity<JSONObject> request = new HttpEntity<>(obj, headers);
        ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, request, String.class);
        String body = responseEntity.getBody();
        return body;
    }
}

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class HttpUrlConnectionToInterface {
    /**
     * 以post或get方式調(diào)用對(duì)方接口方法，
     * @param pathUrl
     */
    public static void doPostOrGet(String pathUrl, String data){
        OutputStreamWriter out = null;
        BufferedReader br = null;
        String result = "";
        try {
            URL url = new URL(pathUrl);
            //打開(kāi)和url之間的連接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //請(qǐng)求方式
            conn.setRequestMethod("POST");
            //conn.setRequestMethod("GET");
            //設(shè)置通用的請(qǐng)求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
            conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            //DoOutput設(shè)置是否向httpUrlConnection輸出，DoInput設(shè)置是否從httpUrlConnection讀入，此外發(fā)送post請(qǐng)求必須設(shè)置這兩個(gè)
            conn.setDoOutput(true);
            conn.setDoInput(true);
            /**
             * 下面的三句代碼，就是調(diào)用第三方http接口
             */
            //獲取URLConnection對(duì)象對(duì)應(yīng)的輸出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            //發(fā)送請(qǐng)求參數(shù)即數(shù)據(jù)
            out.write(data);
            //flush輸出流的緩沖
            out.flush();
            /**
             * 下面的代碼相當(dāng)于，獲取調(diào)用第三方http接口后返回的結(jié)果
             */
            //獲取URLConnection對(duì)象對(duì)應(yīng)的輸入流
            InputStream is = conn.getInputStream();
            //構(gòu)造一個(gè)字符流緩存
            br = new BufferedReader(new InputStreamReader(is));
            String str = "";
            while ((str = br.readLine()) != null){
                result += str;
            }
            System.out.println(result);
            //關(guān)閉流
            is.close();
            //斷開(kāi)連接，disconnect是在底層tcp socket鏈接空閑時(shí)才切斷，如果正在被其他線(xiàn)程使用就不切斷。
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if (out != null){
                    out.close();
                }
                if (br != null){
                    br.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) {
        /**
         *手機(jī)信息查詢(xún)接口：http://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=手機(jī)號(hào)
　　　　 *　　　　　　http://api.showji.com/Locating/www.showji.com.aspx?m=手機(jī)號(hào)&output=json&callback=querycallback
         */
        doPostOrGet("https://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=13026194071", "");
    }
}

   <!--HttpClient-->
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import java.io.IOException;
import java.io.InputStream;
public class HttpClientToInterface {
    /**
     * httpClient的get請(qǐng)求方式
     * 使用GetMethod來(lái)訪(fǎng)問(wèn)一個(gè)URL對(duì)應(yīng)的網(wǎng)頁(yè)實(shí)現(xiàn)步驟：
     * 1.生成一個(gè)HttpClient對(duì)象并設(shè)置相應(yīng)的參數(shù)；
     * 2.生成一個(gè)GetMethod對(duì)象并設(shè)置響應(yīng)的參數(shù)；
     * 3.用HttpClient生成的對(duì)象來(lái)執(zhí)行GetMethod生成的Get方法；
     * 4.處理響應(yīng)狀態(tài)碼；
     * 5.若響應(yīng)正常，處理HTTP響應(yīng)內(nèi)容；
     * 6.釋放連接。
     * @param url
     * @param charset
     * @return
     */
    public static String doGet(String url, String charset){
        /**
         * 1.生成HttpClient對(duì)象并設(shè)置參數(shù)
         */
        HttpClient httpClient = new HttpClient();
        //設(shè)置Http連接超時(shí)為5秒
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
        /**
         * 2.生成GetMethod對(duì)象并設(shè)置參數(shù)
         */
        GetMethod getMethod = new GetMethod(url);
        //設(shè)置get請(qǐng)求超時(shí)為5秒
        getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
        //設(shè)置請(qǐng)求重試處理，用的是默認(rèn)的重試處理：請(qǐng)求三次
        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
        String response = "";
        /**
         * 3.執(zhí)行HTTP GET 請(qǐng)求
         */
        try {
            int statusCode = httpClient.executeMethod(getMethod);
            /**
             * 4.判斷訪(fǎng)問(wèn)的狀態(tài)碼
             */
            if (statusCode != HttpStatus.SC_OK){
                System.err.println("請(qǐng)求出錯(cuò)：" + getMethod.getStatusLine());
            }
            /**
             * 5.處理HTTP響應(yīng)內(nèi)容
             */
            //HTTP響應(yīng)頭部信息，這里簡(jiǎn)單打印
            Header[] headers = getMethod.getResponseHeaders();
            for (Header h: headers){
                System.out.println(h.getName() + "---------------" + h.getValue());
            }
            //讀取HTTP響應(yīng)內(nèi)容，這里簡(jiǎn)單打印網(wǎng)頁(yè)內(nèi)容
            //讀取為字節(jié)數(shù)組
            byte[] responseBody = getMethod.getResponseBody();
            response = new String(responseBody, charset);
            System.out.println("-----------response:" + response);
            //讀取為InputStream，在網(wǎng)頁(yè)內(nèi)容數(shù)據(jù)量大時(shí)候推薦使用
            //InputStream response = getMethod.getResponseBodyAsStream();
        } catch (HttpException e) {
            //發(fā)生致命的異常，可能是協(xié)議不對(duì)或者返回的內(nèi)容有問(wèn)題
            System.out.println("請(qǐng)檢查輸入的URL!");
            e.printStackTrace();
        } catch (IOException e){
            //發(fā)生網(wǎng)絡(luò)異常
            System.out.println("發(fā)生網(wǎng)絡(luò)異常!");
        }finally {
            /**
             * 6.釋放連接
             */
            getMethod.releaseConnection();
        }
        return response;
    }
    /**
     * post請(qǐng)求
     * @param url
     * @param json
     * @return
     */
    public static String doPost(String url, JSONObject json){
        HttpClient httpClient = new HttpClient();
        PostMethod postMethod = new PostMethod(url);
        postMethod.addRequestHeader("accept", "*/*");
        postMethod.addRequestHeader("connection", "Keep-Alive");
        //設(shè)置json格式傳送
        postMethod.addRequestHeader("Content-Type", "application/json;charset=utf-8");
        //必須設(shè)置下面這個(gè)Header
        postMethod.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");
        //添加請(qǐng)求參數(shù)
        postMethod.addParameter("commentId", json.getString("commentId"));
        String res = "";
        try {
            int code = httpClient.executeMethod(postMethod);
            if (code == 200){
                res = postMethod.getResponseBodyAsString();
                System.out.println(res);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return res;
    }
    public static void main(String[] args) {
        doGet("http://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=13026194071", "UTF-8");
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("commentId", "13026194071");
        doPost("http://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=13026194071", jsonObject);
    }
}

<!--CloseableHttpClient-->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.28</version>
        </dependency>

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
public class CloseableHttpClientToInterface {
    private static String tokenString = "";
    private static String AUTH_TOKEN_EXPIRED = "AUTH_TOKEN_EXPIRED";
    private static CloseableHttpClient httpClient = null;
    /**
     * 以get方式調(diào)用第三方接口
     * @param url
     * @return
     */
    public static String doGet(String url, String token){
        //創(chuàng)建HttpClient對(duì)象
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet get = new HttpGet(url);
        try {
            if (tokenString != null && !tokenString.equals("")){
                tokenString = getToken();
            }
            //api_gateway_auth_token自定義header頭，用于token驗(yàn)證使用
            get.addHeader("api_gateway_auth_token", tokenString);
            get.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");
            HttpResponse response = httpClient.execute(get);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                //返回json格式
                String res = EntityUtils.toString(response.getEntity());
                return res;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 以post方式調(diào)用第三方接口
     * @param url
     * @param json
     * @return
     */
    public static String doPost(String url, JSONObject json){
        try {
            if (httpClient == null){
                httpClient = HttpClientBuilder.create().build();
            }
            HttpPost post = new HttpPost(url);
            if (tokenString != null && !tokenString.equals("")){
                tokenString = getToken();
            }
            //api_gateway_auth_token自定義header頭，用于token驗(yàn)證使用
            post.addHeader("api_gateway_auth_token", tokenString);
            post.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");
            StringEntity s = new StringEntity(json.toString());
            s.setContentEncoding("UTF-8");
            //發(fā)送json數(shù)據(jù)需要設(shè)置contentType
            s.setContentType("application/x-www-form-urlencoded");
            //設(shè)置請(qǐng)求參數(shù)
            post.setEntity(s);
            HttpResponse response = httpClient.execute(post);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                //返回json格式
                String res = EntityUtils.toString(response.getEntity());
                return res;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if (httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
    /**
     * 獲取第三方接口的token
     */
    public static String getToken(){
        String token = "";
        JSONObject object = new JSONObject();
        object.put("appid", "appid");
        object.put("secretkey", "secretkey");
        try {
            if (httpClient == null){
                httpClient = HttpClientBuilder.create().build();
            }
            HttpPost post = new HttpPost("http://localhost/login");
            post.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");
            StringEntity s = new StringEntity(object.toString());
            s.setContentEncoding("UTF-8");
            //發(fā)送json數(shù)據(jù)需要設(shè)置contentType
            s.setContentType("application/x-www-form-urlencoded");
            //設(shè)置請(qǐng)求參數(shù)
            post.setEntity(s);
            HttpResponse response = httpClient.execute(post);
            //這里可以把返回的結(jié)果按照自定義的返回?cái)?shù)據(jù)結(jié)果，把string轉(zhuǎn)換成自定義類(lèi)
            //ResultTokenBO result = JSONObject.parseObject(response, ResultTokenBO.class);
           //把response轉(zhuǎn)為jsonObject
            JSONObject result = JSONObject.parseObject(response);
            if (result.containsKey("token")){
                token = result.getString("token");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return token;
    }
    /**
     * 測(cè)試
     */
    public static void test(String telephone){
        JSONObject object = new JSONObject();
        object.put("telephone", telephone);
        try {
            //首先獲取token
            tokenString = getToken();
            String response = doPost("http://localhost/searchUrl", object);
            //如果返回的結(jié)果是list形式的，需要使用JSONObject.parseArray轉(zhuǎn)換
            //List<Result> list = JSONObject.parseArray(response, Result.class);
            System.out.println(response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        test("12345678910");
    }
}

/**
	 * 執(zhí)行一個(gè)HTTP POST請(qǐng)求，返回請(qǐng)求響應(yīng)的HTML
	 * @param url
	 *            請(qǐng)求的URL地址
	 * @param params
	 *            請(qǐng)求的查詢(xún)參數(shù),可以為null
	 * @return 返回請(qǐng)求響應(yīng)的HTML
	 */
	public static void doPost(String url, String name, String pwd, String phone, String content) {
		// 創(chuàng)建默認(rèn)的httpClient實(shí)例.
		CloseableHttpClient httpclient = HttpClients.createDefault();
		// 創(chuàng)建httppost
		HttpPost httppost = new HttpPost(url);
		// 創(chuàng)建參數(shù)隊(duì)列
		List<NameValuePair> formparams = new ArrayList<NameValuePair>();
		formparams.add(new BasicNameValuePair("account", name));
		formparams.add(new BasicNameValuePair("passwd", pwd));
		formparams.add(new BasicNameValuePair("phone", phone));
		formparams.add(new BasicNameValuePair("content", content));
		UrlEncodedFormEntity uefEntity;
		try {
			uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
			httppost.setEntity(uefEntity);
			System.out.println("executing request " + httppost.getURI());
			CloseableHttpResponse response = httpclient.execute(httppost);
			try {
				HttpEntity entity = response.getEntity();
				if (entity != null) {
					System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));
				}
			} finally {
				response.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			// 關(guān)閉連接,釋放資源
			try {
				httpclient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}