HttpUtil.java
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import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.xml.soap.Name;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
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 HttpUtil {
public static void main(String[] args) throws ParseException, IOException {
String url="http://php.weather.sina.com.cn/iframe/index/w_cl.php";
Map<String, String> map = new HashMap<String, String>();
map.put("code", "js");
map.put("day", "0");
map.put("city", "上海");
map.put("dfc", "1");
map.put("charset", "utf-8");
String body = httpPost(url, map,"utf-8");
System.out.println("交易响应结果：");
System.out.println(body);
System.out.println("-----------------------------------");
map.put("city", "北京");
body = send(url, map, "utf-8");
System.out.println("交易响应结果：");
System.out.println(body);
}
//post请求
public static String httpPost(String url,Map<String,String> map,String encoding) throws UnsupportedEncodingException{
String body = "";
CloseableHttpClient client=HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> nvps= new ArrayList<NameValuePair>();
//参数赋值
if(map!=null){
for (Entry<String, String> entry : map.entrySet()) {
nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
httpPost.setEntity(new UrlEncodedFormEntity(nvps,encoding));
System.out.println("请求地址:"+url);
System.out.println("请求参数:"+nvps.toString());
httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
try {
CloseableHttpResponse response=client.execute(httpPost);
HttpEntity entity=response.getEntity();
if(entity!=null){
body=EntityUtils.toString(entity, encoding);
}
//关闭httpEntiy流
EntityUtils.consume(entity);
response.close();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return body;
}
/**
* 模拟请求
*
* @param url 资源地址
* @param map 参数列表
* @param encoding 编码
* @return
* @throws ParseException
* @throws IOException
*/
public static String send(String url, Map<String,String> map,String encoding) throws ParseException, IOException{
String body = "";
//创建httpclient对象
CloseableHttpClient client = HttpClients.createDefault();
//创建post方式请求对象
HttpPost httpPost = new HttpPost(url);
//装填参数
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
if(map!=null){
for (Entry<String, String> entry : map.entrySet()) {
nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
//设置参数到请求对象中
httpPost.setEntity(new UrlEncodedFormEntity(nvps, encoding));
System.out.println("请求地址："+url);
System.out.println("请求参数："+nvps.toString());
//设置header信息
//指定报文头【Content-type】、【User-Agent】
httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
//执行请求操作，并拿到结果（同步阻塞）
CloseableHttpResponse response = client.execute(httpPost);
//获取结果实体
HttpEntity entity = response.getEntity();
if (entity != null) {
//按指定编码转换结果实体为String类型
body = EntityUtils.toString(entity, encoding);
}
EntityUtils.consume(entity);
//释放链接
response.close();
return body;
}
}