Java调用第三方接口

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/lixu_csdn/article/details/88713301

1.以阿里的快递查询接口为例

2.查看其中的参数和示例代码

3.前端请求js

$.ajax({
                    type : "GET",
                    contentType : "application/json;charset=utf-8",
                    url : baseurl + "/case/LoadComName.html",
                    dataType : "json",
                    data:{
                        "companyName": request.term
                    },
                    async : false,
                    success : function(result) {
                        return process(result.Data);
                    }
                });

4.后台控制器（produces="text/html;charset=UTF-8"这个是为了解决返回数据乱码加上的）

/**
     * 控制器
     * 20190318
     */
    @RequestMapping(value = "/LoadComName.html",produces="text/html;charset=UTF-8")
    @ResponseBody
    public String LoadComName(String companyName){
        //获取接口权限码
        String appcode = FileUtils.getProperties("/systemConfig.properties", "CN_AppCode");
        Map<String, String> querys = new HashMap<String, String>();
        Map<String,String> paramMap = new HashMap<String,String>();
        paramMap.put("host","http://xxxx.com");
        paramMap.put("path","/Tax/xxxxx");
        paramMap.put("appcode",appcode);
        Map<String, String> bodys = new HashMap<String, String>();
        bodys.put("CompanyName", companyName);
        bodys.put("Take", "5");
        return RatepayingInfoUtil.getRatepayingInfo(paramMap,querys,bodys);
    }

5.FileUtils文件读取工具类

/**
     * 获取配置文件的内容
     *
     * @param filePath 文件的地址
     * @param keyWord  key值
     */
    public static String getProperties(String filePath, String keyWord) {
        Properties prop = new Properties();
        String value = null;
        try {
            InputStream inputStream = FileUtils.class.getResourceAsStream(filePath);
            prop.load(inputStream);
            value = prop.getProperty(keyWord);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return value;
    }

6.控制器调用的公共方法也可封装为工具类

/**
     * 调用阿里接口post方法
     * @author lierfei
     * @param paramMap 封装参数
     * @return
     */
    public static String getRatepayingInfo(Map<String,String> paramMap,Map<String, String> querys,Map<String, String> bodys){
        String host = "",path = "",appcode = "",keyword="",resultStr = "";
        if(null!=paramMap){
            host = paramMap.get("host");
            path = paramMap.get("path");
            appcode = paramMap.get("appcode");
        }
        HttpResponse response = null;
        Map<String, String> headers = new HashMap<String, String>();
        headers.put("Authorization", "APPCODE " + appcode);
        try {
            response = HttpUtil.doPost(host, path, Constant.REQUEST_POST, headers, querys,bodys);;
            resultStr = EntityUtils.toString(response.getEntity());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultStr;
    }

7.HttpUtils 

package com.ilims.util;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.commons.lang.StringUtils;
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.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
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.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

public class HttpUtil {

        /**
         * get
         *
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @return
         * @throws Exception
         */
        public static HttpResponse doGet(String host, String path, String method,
                                         Map<String, String> headers,
                                         Map<String, String> querys)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpGet request = new HttpGet(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            return httpClient.execute(request);
        }

        /**
         * post form
         *
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @param bodys
         * @return
         * @throws Exception
         */
        public static HttpResponse doPost(String host, String path, String method,
                                          Map<String, String> headers,
                                          Map<String, String> querys,
                                          Map<String, String> bodys)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpPost request = new HttpPost(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            if (bodys != null) {
                List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();

                for (String key : bodys.keySet()) {
                    nameValuePairList.add(new BasicNameValuePair(key, bodys.get(key)));
                }
                UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
                formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
                request.setEntity(formEntity);
            }

            return httpClient.execute(request);
        }

        /**
         * Post String
         *
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @param body
         * @return
         * @throws Exception
         */
        public static HttpResponse doPost(String host, String path, String method,
                                          Map<String, String> headers,
                                          Map<String, String> querys,
                                          String body)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpPost request = new HttpPost(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            if (StringUtils.isNotBlank(body)) {
                request.setEntity(new StringEntity(body, "utf-8"));
            }

            return httpClient.execute(request);
        }

        /**
         * Post stream
         *
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @param body
         * @return
         * @throws Exception
         */
        public static HttpResponse doPost(String host, String path, String method,
                                          Map<String, String> headers,
                                          Map<String, String> querys,
                                          byte[] body)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpPost request = new HttpPost(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            if (body != null) {
                request.setEntity(new ByteArrayEntity(body));
            }

            return httpClient.execute(request);
        }

        /**
         * Put String
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @param body
         * @return
         * @throws Exception
         */
        public static HttpResponse doPut(String host, String path, String method,
                                         Map<String, String> headers,
                                         Map<String, String> querys,
                                         String body)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpPut request = new HttpPut(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            if (StringUtils.isNotBlank(body)) {
                request.setEntity(new StringEntity(body, "utf-8"));
            }

            return httpClient.execute(request);
        }

        /**
         * Put stream
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @param body
         * @return
         * @throws Exception
         */
        public static HttpResponse doPut(String host, String path, String method,
                                         Map<String, String> headers,
                                         Map<String, String> querys,
                                         byte[] body)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpPut request = new HttpPut(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            if (body != null) {
                request.setEntity(new ByteArrayEntity(body));
            }

            return httpClient.execute(request);
        }

        /**
         * Delete
         *
         * @param host
         * @param path
         * @param method
         * @param headers
         * @param querys
         * @return
         * @throws Exception
         */
        public static HttpResponse doDelete(String host, String path, String method,
                                            Map<String, String> headers,
                                            Map<String, String> querys)
                throws Exception {
            HttpClient httpClient = wrapClient(host);

            HttpDelete request = new HttpDelete(buildUrl(host, path, querys));
            for (Map.Entry<String, String> e : headers.entrySet()) {
                request.addHeader(e.getKey(), e.getValue());
            }

            return httpClient.execute(request);
        }

        private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
            StringBuilder sbUrl = new StringBuilder();
            sbUrl.append(host);
            if (!StringUtils.isBlank(path)) {
                sbUrl.append(path);
            }
            if (null != querys) {
                StringBuilder sbQuery = new StringBuilder();
                for (Map.Entry<String, String> query : querys.entrySet()) {
                    if (0 < sbQuery.length()) {
                        sbQuery.append("&");
                    }
                    if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
                        sbQuery.append(query.getValue());
                    }
                    if (!StringUtils.isBlank(query.getKey())) {
                        sbQuery.append(query.getKey());
                        if (!StringUtils.isBlank(query.getValue())) {
                            sbQuery.append("=");
                            sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
                        }
                    }
                }
                if (0 < sbQuery.length()) {
                    sbUrl.append("?").append(sbQuery);
                }
            }

            return sbUrl.toString();
        }

        private static HttpClient wrapClient(String host) {
            HttpClient httpClient = new DefaultHttpClient();
            if (host.startsWith("https://")) {
                sslClient(httpClient);
            }

            return httpClient;
        }

        private static void sslClient(HttpClient httpClient) {
            try {
                SSLContext ctx = SSLContext.getInstance("TLS");
                X509TrustManager tm = new X509TrustManager() {
                    public X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkClientTrusted(X509Certificate[] xcs, String str) {

                    }
                    public void checkServerTrusted(X509Certificate[] xcs, String str) {

                    }
                };
                ctx.init(null, new TrustManager[] { tm }, null);
                SSLSocketFactory ssf = new SSLSocketFactory(ctx);
                ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
                ClientConnectionManager ccm = httpClient.getConnectionManager();
                SchemeRegistry registry = ccm.getSchemeRegistry();
                registry.register(new Scheme("https", 443, ssf));
            } catch (KeyManagementException ex) {
                throw new RuntimeException(ex);
            } catch (NoSuchAlgorithmException ex) {
                throw new RuntimeException(ex);
            }
        }
}

最后，收费接口购买后会发送一个appcode权限码，在配置文件配置一下就可以了。