调用第三方接口，POST表单提交

原创已于 2024-08-22 17:46:03 修改 · 706 阅读

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#java

于 2020-12-25 15:07:29 首次发布

本文详细介绍了如何通过HTTP POST请求与第三方接口进行表单数据提交，包括设置请求头、构建请求体以及处理响应数据的方法，适用于各种编程语言。

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package com.itmoll.yinlianpay.until;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.*;

/**
 * 调用第三方httpPost和httpGet请求方式
 */
public class HttpRequestUtil {
    private static CloseableHttpClient httpClient;

    static {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(100);// 整个连接池最大连接数
        cm.setDefaultMaxPerRoute(20); // 每路由最大连接数，默认值是2
        httpClient = HttpClients.custom().setConnectionManager(cm).build();
    }

    public static String doHttpGet(String url) {
        CloseableHttpResponse response = null;
        try {
            HttpGet httpGet = new HttpGet(url);
            RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(30000).setConnectionRequestTimeout(30000).setSocketTimeout(30000).build();
            httpGet.setConfig(requestConfig);
            // 设置提交方式
            httpGet.addHeader("Content-type", "application/json; charset=utf-8");
            // 执行http请求
            response = httpClient.execute(httpGet);
            // 获得http响应体
            HttpEntity entity = response.getEntity();
            System.out.println("entity:" + entity);
            if (entity != null) {
                // 响应的结果
                String content = EntityUtils.toString(entity, "UTF-8");
                return content;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 表单方式提交
     */
    public static String doHttpPostForm(String url, Map<String,String> param) {
        CloseableHttpResponse response = null;
        try {
            HttpPost httpPost = new HttpPost(url);
            RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(30000).setConnectionRequestTimeout(30000).setSocketTimeout(30000).build();
            httpPost.setConfig(requestConfig);
            // 设置提交方式
            httpPost.addHeader("Content-type", "application/x-www-form-urlencoded");
            // 添加参数
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            if (param.size() != 0) {
                // 将param中的key存在set集合中，通过迭代器取出所有的key，再获取每一个键对应的值
                Set keySet = param.keySet();
                Iterator it = keySet.iterator();
                while (it.hasNext()) {
                    String k = (String) it.next();// key
                    String v = param.get(k);// value
                    nameValuePairs.add(new BasicNameValuePair(k, v));
                }
            }
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            // 执行http请求
            response = httpClient.execute(httpPost);
            // 获得http响应体
            HttpEntity entity = response.getEntity();
            System.out.println("entity:" + entity);
            if (entity != null) {
                // 响应的结果
                String content = EntityUtils.toString(entity, "UTF-8");
                return content;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}