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服務器之家 - 編程語言 - JAVA教程 - Java 調用Restful API接口的幾種方式(HTTPS)

Java 調用Restful API接口的幾種方式(HTTPS)

2021-04-05 12:37三 豐 JAVA教程

這篇文章主要介紹了Java 調用Restful API接口的幾種方式(HTTPS)，小編覺得挺不錯的，現在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

摘要：最近有一個需求，為客戶提供一些Restful API 接口，QA使用postman進行測試，但是postman的測試接口與java調用的相似但并不相同，于是想自己寫一個程序去測試Restful API接口，由于使用的是HTTPS，所以還要考慮到對于HTTPS的處理。由于我也是首次使用Java調用restful接口，所以還要研究一番，自然也是查閱了一些資料。

分析：這個問題與模塊之間的調用不同，比如我有兩個模塊front end 和back end，front end提供前臺展示，back end提供數據支持。之前使用過Hession去把back end提供的服務注冊成遠程服務，在front end端可以通過這種遠程服務直接調到back end的接口。但這對于一個公司自己的一個項目耦合性比較高的情況下使用，沒有問題。但是如果給客戶注冊這種遠程服務，似乎不太好，耦合性太高。所以就考慮用一下方式進行處理。

一、HttpClient

HttpClient大家也許比較熟悉但又比較陌生，熟悉是知道他可以遠程調用比如請求一個URL，然后在response里獲取到返回狀態和返回信息，但是今天講的稍微復雜一點，因為今天的主題是HTTPS，這個牽涉到證書或用戶認證的問題。
確定使用HttpClient之后，查詢相關資料，發現HttpClient的新版本與老版本不同，隨然兼容老版本，但已經不提倡老版本是使用方式，很多都已經標記為過時的方法或類。今天就分別使用老版本4.2和最新版本4.5.3來寫代碼。

老版本4.2

需要認證

在準備證書階段選擇的是使用證書認證

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package com.darren.test.https.v42;
import java.io.File;
import java.io.FileInputStream;
import java.security.KeyStore;
import org.apache.http.conn.ssl.SSLSocketFactory; 
public class HTTPSCertifiedClient extends HTTPSClient { 
  public HTTPSCertifiedClient() {
 
  }
 
  @Override
  public void prepareCertificate() throws Exception {
    // 獲得密匙庫
    KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
    FileInputStream instream = new FileInputStream(
        new File("C:/Users/zhda6001/Downloads/software/xxx.keystore"));
    // FileInputStream instream = new FileInputStream(new File("C:/Users/zhda6001/Downloads/xxx.keystore"));
    // 密匙庫的密碼
    trustStore.load(instream, "password".toCharArray());
    // 注冊密匙庫
    this.socketFactory = new SSLSocketFactory(trustStore);
    // 不校驗域名
    socketFactory.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
  }
}

跳過認證

在準備證書階段選擇的是跳過認證

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package com.darren.test.https.v42; 
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager; 
import org.apache.http.conn.ssl.SSLSocketFactory;
public class HTTPSTrustClient extends HTTPSClient {
  public HTTPSTrustClient() {
 
  }
 
  @Override
  public void prepareCertificate() throws Exception {
    // 跳過證書驗證
    SSLContext ctx = SSLContext.getInstance("TLS");
    X509TrustManager tm = new X509TrustManager() {
      @Override
      public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
      }
 
      @Override
      public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
      }
 
      @Override
      public X509Certificate[] getAcceptedIssuers() {
        return null;
      }
    };
    // 設置成已信任的證書
    ctx.init(null, new TrustManager[] { tm }, null);
    // 穿件SSL socket 工廠，并且設置不檢查host名稱
    this.socketFactory = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
  }
}

總結

現在發現這兩個類都繼承了同一個類HTTPSClient，并且HTTPSClient繼承了DefaultHttpClient類，可以發現，這里使用了模板方法模式。

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package com.darren.test.https.v42;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient; 
public abstract class HTTPSClient extends DefaultHttpClient { 
  protected SSLSocketFactory socketFactory;
 
  /**
   * 初始化HTTPSClient
   *
   * @return 返回當前實例
   * @throws Exception
   */
  public HTTPSClient init() throws Exception {
    this.prepareCertificate();
    this.regist();
 
    return this;
  } 
  /**
   * 準備證書驗證
   *
   * @throws Exception
   */
  public abstract void prepareCertificate() throws Exception;
 
  /**
   * 注冊協議和端口, 此方法也可以被子類重寫
   */
  protected void regist() {
    ClientConnectionManager ccm = this.getConnectionManager();
    SchemeRegistry sr = ccm.getSchemeRegistry();
    sr.register(new Scheme("https", 443, socketFactory));
  }
}

下邊是工具類

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package com.darren.test.https.v42; 
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils; 
public class HTTPSClientUtil {
  private static final String DEFAULT_CHARSET = "UTF-8"; 
  public static String doPost(HTTPSClient httpsClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody) throws Exception {
    return doPost(httpsClient, url, paramHeader, paramBody, DEFAULT_CHARSET);
  }
 
  public static String doPost(HTTPSClient httpsClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody, String charset) throws Exception {
 
    String result = null;
    HttpPost httpPost = new HttpPost(url);
    setHeader(httpPost, paramHeader);
    setBody(httpPost, paramBody, charset);
 
    HttpResponse response = httpsClient.execute(httpPost);
    if (response != null) {
      HttpEntity resEntity = response.getEntity();
      if (resEntity != null) {
        result = EntityUtils.toString(resEntity, charset);
      }
    }
 
    return result;
  }
   
  public static String doGet(HTTPSClient httpsClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody) throws Exception {
    return doGet(httpsClient, url, paramHeader, paramBody, DEFAULT_CHARSET);
  }
 
  public static String doGet(HTTPSClient httpsClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody, String charset) throws Exception {
 
    String result = null;
    HttpGet httpGet = new HttpGet(url);
    setHeader(httpGet, paramHeader);
 
    HttpResponse response = httpsClient.execute(httpGet);
    if (response != null) {
      HttpEntity resEntity = response.getEntity();
      if (resEntity != null) {
        result = EntityUtils.toString(resEntity, charset);
      }
    }
 
    return result;
  }
 
  private static void setHeader(HttpRequestBase request, Map<String, String> paramHeader) {
    // 設置Header
    if (paramHeader != null) {
      Set<String> keySet = paramHeader.keySet();
      for (String key : keySet) {
        request.addHeader(key, paramHeader.get(key));
      }
    }
  }
 
  private static void setBody(HttpPost httpPost, Map<String, String> paramBody, String charset) throws Exception {
    // 設置參數
    if (paramBody != null) {
      List<NameValuePair> list = new ArrayList<NameValuePair>();
      Set<String> keySet = paramBody.keySet();
      for (String key : keySet) {
        list.add(new BasicNameValuePair(key, paramBody.get(key)));
      }
 
      if (list.size() > 0) {
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
        httpPost.setEntity(entity);
      }
    }
  }
}

然后是測試類：

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package com.darren.test.https.v42;
import java.util.HashMap;
import java.util.Map; 
public class HTTPSClientTest { 
  public static void main(String[] args) throws Exception {
    HTTPSClient httpsClient = null;
 
    httpsClient = new HTTPSTrustClient().init();
    //httpsClient = new HTTPSCertifiedClient().init();
 
    String url = "https://1.2.6.2:8011/xxx/api/getToken";
    //String url = "https://1.2.6.2:8011/xxx/api/getHealth";
 
    Map<String, String> paramHeader = new HashMap<>();
    //paramHeader.put("Content-Type", "application/json");
    paramHeader.put("Accept", "application/xml");
    Map<String, String> paramBody = new HashMap<>();
    paramBody.put("client_id", "[email protected]");
    paramBody.put("client_secret", "P@ssword_1");
    String result = HTTPSClientUtil.doPost(httpsClient, url, paramHeader, paramBody);
     
    //String result = HTTPSClientUtil.doGet(httpsClient, url, null, null);
     
    System.out.println(result);
  } 
}

返回信息：

<?xml version="1.0" encoding="utf-8"?>   
<token>jkf8RL0sw+Skkflj8RbKI5hP1bEQK8PrCuTZPpBINqMYKRMxY1kWCjmCfT191Zpp88VV1aGHW8oYNWjEYS0axpLuGAX89ejCoWNbikCc1UvfyesXHLktcJqyUFiVjevhrEQxJPHncLQYWP+Xse5oD9X8vKFKk7InNTMRzQK7YBTZ/e3U7gswM/5cvAHFl6o9rEq9cWPXavZNohyvnXsohSzDo+BXAtXxa1xpEDLy/8h/UaP4n4dlZDJJ3B8t1Xh+CRRIoMOPxf7c5wKhHtOkEOeXW+xoPQKKSx5CKWwJpPuGIIFWF/PaqWg+JUOsVT7QGdPv8PMWJ9DwEwjTdxguDg==</token> 

新版本4.5.3

需要認證

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package com.darren.test.https.v45; 
import java.io.File;
import java.io.FileInputStream;
import java.security.KeyStore;
import javax.net.ssl.SSLContext;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.ssl.SSLContexts; 
public class HTTPSCertifiedClient extends HTTPSClient { 
  public HTTPSCertifiedClient() {
 
  }
 
  @Override
  public void prepareCertificate() throws Exception {
    // 獲得密匙庫
    KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
    FileInputStream instream = new FileInputStream(
        new File("C:/Users/zhda6001/Downloads/software/xxx.keystore"));
    // FileInputStream instream = new FileInputStream(new File("C:/Users/zhda6001/Downloads/xxx.keystore"));
    try {
      // 密匙庫的密碼
      trustStore.load(instream, "password".toCharArray());
    } finally {
      instream.close();
    } 
    SSLContext sslcontext = SSLContexts.custom().loadTrustMaterial(trustStore, TrustSelfSignedStrategy.INSTANCE)
        .build();
    this.connectionSocketFactory = new SSLConnectionSocketFactory(sslcontext);
  } 
}

跳過認證

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package com.darren.test.https.v45; 
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
public class HTTPSTrustClient extends HTTPSClient {
  public HTTPSTrustClient() { 
  }
 
  @Override
  public void prepareCertificate() throws Exception {
    // 跳過證書驗證
    SSLContext ctx = SSLContext.getInstance("TLS");
    X509TrustManager tm = new X509TrustManager() {
      @Override
      public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
      }
 
      @Override
      public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
      }
 
      @Override
      public X509Certificate[] getAcceptedIssuers() {
        return null;
      }
    };
    // 設置成已信任的證書
    ctx.init(null, new TrustManager[] { tm }, null);
    this.connectionSocketFactory = new SSLConnectionSocketFactory(ctx);
  }
}

總結

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package com.darren.test.https.v45; 
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; 
public abstract class HTTPSClient extends HttpClientBuilder {
  private CloseableHttpClient client;
  protected ConnectionSocketFactory connectionSocketFactory;
 
  /**
   * 初始化HTTPSClient
   *
   * @return 返回當前實例
   * @throws Exception
   */
  public CloseableHttpClient init() throws Exception {
    this.prepareCertificate();
    this.regist();
 
    return this.client;
  }
 
  /**
   * 準備證書驗證
   *
   * @throws Exception
   */
  public abstract void prepareCertificate() throws Exception;
 
  /**
   * 注冊協議和端口, 此方法也可以被子類重寫
   */
  protected void regist() {
    // 設置協議http和https對應的處理socket鏈接工廠的對象
    Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
        .register("http", PlainConnectionSocketFactory.INSTANCE)
        .register("https", this.connectionSocketFactory)
        .build();
    PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
    HttpClients.custom().setConnectionManager(connManager);
 
    // 創建自定義的httpclient對象
    this.client = HttpClients.custom().setConnectionManager(connManager).build();
    // CloseableHttpClient client = HttpClients.createDefault();
  }
}

工具類：

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package com.darren.test.https.v45; 
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set; 
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.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils; 
public class HTTPSClientUtil {
  private static final String DEFAULT_CHARSET = "UTF-8"; 
  public static String doPost(HttpClient httpClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody) throws Exception {
    return doPost(httpClient, url, paramHeader, paramBody, DEFAULT_CHARSET);
  }
 
  public static String doPost(HttpClient httpClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody, String charset) throws Exception {
 
    String result = null;
    HttpPost httpPost = new HttpPost(url);
    setHeader(httpPost, paramHeader);
    setBody(httpPost, paramBody, charset); 
    HttpResponse response = httpClient.execute(httpPost);
    if (response != null) {
      HttpEntity resEntity = response.getEntity();
      if (resEntity != null) {
        result = EntityUtils.toString(resEntity, charset);
      }
    }
 
    return result;
  }
   
  public static String doGet(HttpClient httpClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody) throws Exception {
    return doGet(httpClient, url, paramHeader, paramBody, DEFAULT_CHARSET);
  }
 
  public static String doGet(HttpClient httpClient, String url, Map<String, String> paramHeader,
      Map<String, String> paramBody, String charset) throws Exception {
 
    String result = null;
    HttpGet httpGet = new HttpGet(url);
    setHeader(httpGet, paramHeader);
 
    HttpResponse response = httpClient.execute(httpGet);
    if (response != null) {
      HttpEntity resEntity = response.getEntity();
      if (resEntity != null) {
        result = EntityUtils.toString(resEntity, charset);
      }
    }
 
    return result;
  }
 
  private static void setHeader(HttpRequestBase request, Map<String, String> paramHeader) {
    // 設置Header
    if (paramHeader != null) {
      Set<String> keySet = paramHeader.keySet();
      for (String key : keySet) {
        request.addHeader(key, paramHeader.get(key));
      }
    }
  }
 
  private static void setBody(HttpPost httpPost, Map<String, String> paramBody, String charset) throws Exception {
    // 設置參數
    if (paramBody != null) {
      List<NameValuePair> list = new ArrayList<NameValuePair>();
      Set<String> keySet = paramBody.keySet();
      for (String key : keySet) {
        list.add(new BasicNameValuePair(key, paramBody.get(key)));
      }
 
      if (list.size() > 0) {
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
        httpPost.setEntity(entity);
      }
    }
  }
}

測試類：

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package com.darren.test.https.v45; 
import java.util.HashMap;
import java.util.Map;
import org.apache.http.client.HttpClient; 
public class HTTPSClientTest { 
  public static void main(String[] args) throws Exception {
    HttpClient httpClient = null;
 
    //httpClient = new HTTPSTrustClient().init();
    httpClient = new HTTPSCertifiedClient().init();
 
    String url = "https://1.2.6.2:8011/xxx/api/getToken";
    //String url = "https://1.2.6.2:8011/xxx/api/getHealth";
 
    Map<String, String> paramHeader = new HashMap<>();
    paramHeader.put("Accept", "application/xml");
    Map<String, String> paramBody = new HashMap<>();
    paramBody.put("client_id", "[email protected]");
    paramBody.put("client_secret", "P@ssword_1");
    String result = HTTPSClientUtil.doPost(httpClient, url, paramHeader, paramBody);
     
    //String result = HTTPSClientUtil.doGet(httpsClient, url, null, null);
     
    System.out.println(result);
  }
 
}

結果：

<?xml version="1.0" encoding="utf-8"?>   
<token>RxitF9//7NxwXJS2cjIjYhLtvzUNvMZxxEQtGN0u07sC9ysJeIbPqte3hCjULSkoXPEUYGUVeyI9jv7/WikLrzxYKc3OSpaTSM0kCbCKphu0TB2Cn/nfzv9fMLueOWFBdyz+N0sEiI9K+0Gp7920DFEncn17wUJVmC0u2jwvM5FAjQKmilwodXZ6a0Dq+D7dQDJwVcwxBvJ2ilhyIb3pr805Vppmi9atXrVAKO0ODa006wEJFOfcgyG5p70wpJ5rrBL85vfy9WCvkd1R7j6NVjhXgH2gNimHkjEJorMjdXW2gKiUsiWsELi/XPswao7/CTWNwTnctGK8PX2ZUB0ZfA==</token> 

二、HttpURLConnection

三、Spring的RestTemplate

其它方式以后補充

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。

原文鏈接：http://blog.csdn.net/zpf336/article/details/73480810

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