Java 发送http post 请求详解编程语言

package com.sm.utils; 
 
import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import java.io.PrintWriter; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.springframework.web.multipart.MultipartHttpServletRequest; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.CloseableHttpResponse; 
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.message.BasicNameValuePair; 
import org.apache.http.util.EntityUtils; 
 
public class HttpUtils { 
    public static final String CHARSET = "UTF-8"; 
    // 发送get请求 url?a=x&b=xx形式 
    public static String sendGet(String url, String param) { 
        String result = ""; 
        BufferedReader in = null; 
        try { 
            String urlName = ""; 
            if (param.length() != 0) { 
                urlName = url + "?" + param; 
            } else 
                urlName = url; 
            URL resUrl = new URL(urlName); 
            URLConnection urlConnec = resUrl.openConnection(); 
            urlConnec.setRequestProperty("accept", "*/*"); 
            urlConnec.setRequestProperty("connection", "Keep-Alive"); 
            urlConnec.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); 
            urlConnec.connect(); 
            Map<String, List<String>> map = urlConnec.getHeaderFields(); 
            for (String key : map.keySet()) { 
                System.out.println(key + "--->" + map.get(key)); 
            } 
            // 定义 BufferedReader输入流来读取URL的响应 
            in = new BufferedReader(new InputStreamReader(urlConnec.getInputStream())); 
            String line; 
            while ((line = in.readLine()) != null) { 
                result += line; 
            } 
        } catch (Exception e) { 
            System.out.println("发送get请求失败" + e); 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (in != null) { 
                    in.close(); 
                } 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
        } 
        return result; 
    } 
 
    // 发送post请求 
    public static String sendPost(String url, MultipartHttpServletRequest param) { 
        String result = ""; 
        PrintWriter out = null; 
        BufferedReader in = null; 
        try { 
            URL resUrl = new URL(url); 
            URLConnection urlConnec = resUrl.openConnection(); 
            urlConnec.setRequestProperty("accept", "*/*"); 
            urlConnec.setRequestProperty("connection", "Keep-Alive"); 
            urlConnec.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); 
            // 发送POST请求必须设置如下两行 
            urlConnec.setDoInput(true); 
            urlConnec.setDoOutput(true); 
 
            out = new PrintWriter(urlConnec.getOutputStream()); 
            out.print(param);// 发送post参数 
            out.flush(); 
            // 定义 BufferedReader输入流来读取URL的响应 
            in = new BufferedReader(new InputStreamReader(urlConnec.getInputStream())); 
            String line; 
            while ((line = in.readLine()) != null) { 
                result += line; 
            } 
        } catch (Exception e) { 
            System.out.println("post请求发送失败" + e); 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (in != null) { 
                    in.close(); 
                } 
                if (out != null) { 
                    out.close(); 
                } 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
        } 
        return result; 
    } 
     
     
    //post请求方法 
    public static  String sendPost(String url, Map<String,Object> params) { 
       String response = null; 
       System.out.println(url); 
       System.out.println(params); 
       try { 
           List<NameValuePair> pairs = null; 
            if (params != null && !params.isEmpty()) { 
                pairs = new ArrayList<NameValuePair>(params.size()); 
                for (String key : params.keySet()) { 
                    pairs.add(new BasicNameValuePair(key, params.get(key).toString())); 
            } 
            } 
           CloseableHttpClient httpclient = null; 
           CloseableHttpResponse httpresponse = null; 
           try { 
               httpclient = HttpClients.createDefault(); 
               HttpPost httppost = new HttpPost(url); 
              // StringEntity stringentity = new StringEntity(data); 
               if (pairs != null && pairs.size() > 0) { 
                   httppost.setEntity(new UrlEncodedFormEntity(pairs, CHARSET)); 
               } 
               httpresponse = httpclient.execute(httppost); 
               response = EntityUtils 
                       .toString(httpresponse.getEntity()); 
               System.out.println(response); 
           } finally { 
               if (httpclient != null) { 
                   httpclient.close(); 
               } 
               if (httpresponse != null) { 
                   httpresponse.close(); 
               } 
           } 
       } catch (Exception e) { 
           e.printStackTrace(); 
       } 
       return response; 
    } 
    public static void main(String[] args) { 
        Map<String,Object> map = new HashMap<String,Object>(); 
        map.put("id","123456666"); 
        sendPost("http://192.168.1.56:8080/smkj/api/lcds/user/lcdsUser",map); 
    } 
    /** 
     * 测试 
     * 说明：这里用新浪股票接口做get测试,新浪股票接口不支持jsonp,至于post,因为本人用的公司的接口就不展示了,一样的,一个url,一个数据包 
     */ 
    /* 
     * public static void main(String[] args) { // TODO Auto-generated method 
     * stub String resultGet = sendGet("http://hq.sinajs.cn/list=sh600389",""); 
     * System.out.println(resultGet); } 
     */ 
 
}