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); } 
*/ 
}