JAVA 调用外部接口

系统需要调用guo wai一个接口，由于调用的guowai接口，需要通过proxy请求
现在有3个方案
1.使用proxy进行http请求
2.直接使用guo wai服务器部署项目
3.使用HK服务器作为中介获取返回数据

1：问题，代理不稳定
2：问题，相对于较繁琐

推荐用3

当不想每次写完代码，部署到HK服务器进行测试，可以先本地使用proxy进行测试，或者使用proxy IP。
工具都有提供端口号，具体可以咨询软件提供商

如需要用SoapUI，Postman测试,请看Utils内的
HTTP Auth认证请求- SoapUI
HTTP Auth认证请求- Postman
方法3：
相关JAR包
Maven依赖：

org.apache.httpcomponents
httpclient
4.5

org.jsoup jsoup 1.3.3

JAVA工具类：
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
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 sun.misc.BASE64Encoder;

import java.io.IOException;

/**

• Created by BugRoot on 2020/7/28.
  */
  public class HttpUtils {

  /**

  • Post请求webservice 带http认证

  • @param url 请求地址

  • @param param 请求参数

  • @param SOAPAction SOAPAction 接口 – 如不需要注释掉

  • @return
    */
    public static String httpClientPostSOAPActionAndAuth(String url, String param, String username,String password, String SOAPAction){
    System.out.println(param);
    CloseableHttpClient http = HttpClientBuilder.create().setProxy(new HttpHost(“127.0.0.1”,1081)).build();// 测试环境–本地proxy方式
    // CloseableHttpClient http = HttpClientBuilder.create().build();// 生产环境–部署到服务器
    HttpPost httpPost = new HttpPost(url);
    CloseableHttpResponse res = null;
    String entity = “”;
    // 请求错误
    String errorMessage="";
    try {
    // 下述方式不推荐，BASE64Encoder和BASE64Decoder这两个方法是sun公司的内部方法，没有 在java api中公开过， 使用这些方法是不安全的
    // String token = username +":"+ password;
    // BASE64Encoder base64en = new BASE64Encoder();
    // token = base64en.encode(token.getBytes(“utf-8”));
    // token = "Basic " + token;
    // System.out.println(token);
    // 建议使用apache的API-可引用import org.apache.commons.codec.binary.Base64;进行替换
    我使用的是java.util的
    String token = “Basic " + “Basic " + Base64.getEncoder().encodeToString(username +”:”+password.getBytes(StandardCharsets.UTF_8));
    StringEntity s = new StringEntity(param, “UTF-8”);
    //s.setContentEncoding(“UTF-8”);
    // s.setContentType(“text/xml”);//发送json数据需要设置contentType
    // s.setContentType(“application/xml”);//发送json数据需要设置contentType
    httpPost.setHeader(“Accept-Encoding”,“gzip,deflate”);
    httpPost.setHeader(“Content-Type”,“text/xml”);
    httpPost.setHeader(“SOAPAction”,SOAPAction); //设置接口方法名
    httpPost.setHeader(“Host”,“xxx.com”);// 如不需请注释
    httpPost.setHeader(“Connection”,“Keep-Alive”);
    httpPost.setHeader(“Accept-Encoding”,“gzip,deflate”);
    httpPost.setHeader(“User-Agent”,“Apache-HttpClient/4.1.1 (java 1.5)”);
    // httpPost.setHeader(“Authorization”,token);
    httpPost.setHeader(“Authorization”,“Basic ZmYxOWY0ZTBmZDhmNDE0NTllNjI0M2Q5ZTZmYmJkMTY6dUs3Ln14cCg=”);
    httpPost.setEntity(s);
    res = http.execute(httpPost);
    HttpEntity responseEntity = res.getEntity();
    System.out.println(“response status” + res.getStatusLine());
    // 获取状态码
    int statusCod = res.getStatusLine().getStatusCode();
    if(statusCod > 200){
    // TODO: 2020/7/28
    }
    // 解析响应报文 TODO
    if (responseEntity != null) {
    System.out.println(“response length:” + responseEntity.getContentLength());
    entity = EntityUtils.toString(responseEntity);
    System.out.println(“response content:” + entity);
    } else {
    errorMessage = “service exception”;
    }
    } catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    } finally {
    try {
    http.close();
    res.close();
    } catch (IOException e) {
    e.printStackTrace();
    }

    }

    return entity;
    }
    }

如图一报文：

解析WebService返回的报文

String result = httpClientPostSOAPActionAndAuth(url, param, username, password, SOAPAction);
Document doc = Jsoup.parse(result );
Elements error = doc.getElementsByTag(“Error”);
if (error != null && error.size() > 0) {
String code = doc.getElementsByTag(“Code”).text();
String description = doc.getElementsByTag(“Description”).text();
System.out.println(code);
System.out.println(description);
message = code + description;
}

System.out.println(message );