anchor.diff:  <%@ page import="com.squareup.okhttp.OkHttpClient"%>
   <%@ page import="com.squareup.okhttp.Request"%>
   <%@ page import="com.squareup.okhttp.Response"%>
  -<%@ page import="java.util.Arrays" %>
  +<%@ page import="org.apache.commons.lang.StringUtils" %>
  +<%@ page import="org.apache.commons.lang.exception.ExceptionUtils" %>
  +<%@ page import="net.bytebuddy.implementation.bytecode.Throw" %>
   
   <%--
     Created by IntelliJ IDEA.
  
positive.code:             Response response = client.newCall(request).execute();
              result = response.body().string();
          } catch (Exception e) {
              result = "<pre>"+ Arrays.toString(e.getStackTrace()) +"<pre>";
          }
          return result;
      }
  
negative.code:         String result = httpGet(urlString);
          result = result.replace("<", "&lt;");
          result = result.replace(">", "&gt;");
          out.println("<pre>" +result+ "</pre>");
      }
  %>
  <p>okhttp 调用方式: </p>
  