java通过Http get post请求url获取数据

package com.avic.core.utils;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
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.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSONObject;
public class HttpGetRequest {

/**
* Get Request
*
* @return
* @throws Exception
*/
public static String doGet(String url) throws Exception {
URL localURL = new URL(url);
URLConnection connection = localURL.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
httpURLConnection.setRequestProperty("Content-Type",
"application/text");

InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;

if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception(
"HTTP Request is not success, Response code is "
+ httpURLConnection.getResponseCode());
}

try {
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader);

while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
}

} finally {

if (reader != null) {
reader.close();
}

if (inputStreamReader != null) {
inputStreamReader.close();
}

if (inputStream != null) {
inputStream.close();
}

}
return resultBuffer.toString();
}
/**
* Http post
* @param url post请求url
* @param params 参数
* @return
* @throws Exception
*/
public static String doPost(String url,Map<String, String> params) throws Exception {
HttpPost httpPost=new HttpPost(url);
HttpClient httpclient=new DefaultHttpClient();
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
if(params!=null){
BasicNameValuePair bnvp=null;
for (Map.Entry<String, String> p : params.entrySet()) {
bnvp=new BasicNameValuePair(p.getKey(), p.getValue());
}
}
httpPost.setEntity(new UrlEncodedFormEntity(nvps));
HttpResponse response = httpclient.execute(httpPost);
HttpEntity respEntity = response.getEntity();//获得返回数据
String text = EntityUtils.toString(respEntity, "UTF-8");
JSONObject obj = (JSONObject) JSONObject.parse(text);
httpclient.getConnectionManager().shutdown();
return obj.toJSONString();
}
}