java 模拟post请求

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package com.gt.util;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;
import org.springframework.stereotype.Component;
public class BaseHttpHelper {
/**
* ReadStream
* @param InputStream
* @return byte[]
* @throws Exception
*/
protected byte[] readStream(InputStream inStream) throws Exception{
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while( (len = inStream.read(buffer)) != -1){
outSteam.write(buffer, 0, len);
}
outSteam.close();
inStream.close();
return outSteam.toByteArray();
}
/**
* Post Data
* @param path
* @param params
* @param encode
* @param timeout
* @return byte[]
* @throws Exception
*/
protected byte[] post(String path, Map<String, String> params, String encode, int timeout) throws Exception{
byte[] resultBuffer = null;
StringBuilder parambuilder = new StringBuilder("");
if(params != null && !params.isEmpty()) {
for(Map.Entry<String, String> entry : params.entrySet()){
parambuilder.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), encode)).append("&");
}
parambuilder.deleteCharAt(parambuilder.length()-1);
}
byte[] data = parambuilder.toString().getBytes();
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(timeout * 1000);
conn.setReadTimeout(timeout * 1000);
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
conn.setRequestProperty("Accept-Language", "zh-CN");
// conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (iPhone; CPU iPhone OS 7_0 like Mac OS X; en-us) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
conn.setRequestProperty("Connection", "Keep-Alive");
DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(data);
outStream.flush();
outStream.close();
if(conn.getResponseCode() == 200){
resultBuffer = readStream(conn.getInputStream());
}
conn.disconnect();
return resultBuffer;
}
public static void main(String[] args) throws Exception {
//调用
BaseHttpHelper bh = new BaseHttpHelper();
Map<String, String> params = new HashMap<String, String>();
params.put("type", "yuantong");
params.put("postid", "9999999999");
System.out.println(new String(bh.post("http://www.kuaidi100.com/query", params, "UTF-8", 5000),"UTF-8"));
}
}

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