简单http请求发送，可以自己设置contentType，跨域等信息

importjava.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import java.nio.charset.Charset;import java.util.List;import java.util.Map;import org.apache.http.HttpEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.entity.mime.HttpMultipartMode;import org.apache.http.entity.mime.MultipartEntityBuilder;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.util.EntityUtils;/** * Http工具 */public class HttpUtil {          /**      * 简单post文本      * @param url 请求地址      * @param text 请求内容      */     public static String simplePost( String url , String text ){           try {              CloseableHttpClient httpclient = HttpClientBuilder.create().build();              HttpPost httppost = new HttpPost(url );              StringEntity se = new StringEntity( text );               se.setContentType( "text/xml;charset=utf-8" );               httppost.setEntity( se );                              httppost.addHeader( "Content-Type","application/json" );                            CloseableHttpResponse response = httpclient.execute( httppost );              HttpEntity entity = response.getEntity();              String html = EntityUtils. toString( entity, "utf-8" );               httppost.releaseConnection();               return html ;          } catch (Exception e ) {               throw new RuntimeException( e );          }     }          /**      * 简单post文本      * @param url 请求地址      * @param text 请求内容      */     public static String simplePost( String url , String text, Map
     
       headMap ){           try {              CloseableHttpClient httpclient = HttpClientBuilder.create().build();              HttpPost httppost = new HttpPost(url );              StringEntity se = new StringEntity( text );               se.setContentType( "text/xml;charset=utf-8" );               httppost.setEntity( se );                             if( headMap != null ){                    for( String hk : headMap .keySet() ){                         httppost.addHeader( hk, headMap.get(hk ) );                   }              }                            CloseableHttpResponse response = httpclient.execute( httppost );              HttpEntity entity = response.getEntity();              String html = EntityUtils. toString( entity, "utf-8" );               httppost.releaseConnection();               return html ;          } catch (Exception e ) {               throw new RuntimeException( e );          }     }          /**      * ajax 请求get 方式      * @param url      * @return      */     public static String simpleGet( String url ){           try {              CloseableHttpClient httpclient = HttpClientBuilder.create().build();              HttpGet httpget = new HttpGet(url );                httpget.setHeader( "Access-Control-Allow-Origin","*" );                            CloseableHttpResponse response = httpclient.execute( httpget );              HttpEntity entity = response.getEntity();              String html = EntityUtils. toString( entity, "utf-8" );               httpget.releaseConnection();               return html ;          } catch (Exception e ) {               throw new RuntimeException( e );          }     }}