content: /*
   * 微信公众平台(JAVA) SDK
   *
   * Copyright (c) 2014, Ansitech Network Technology Co.,Ltd All rights reserved.
   * 
   * http://www.weixin4j.org/
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.weixin4j.util;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.UnsupportedEncodingException;
  
  /**
   * 将微信POST的流转换为XStream，然后转换为InputMessage对象
   *
   * @author yangqisheng
   * @since 0.0.1
   */
  public class XStreamFactory {
  
      /**
       * 将输入流转读取成字符串
       *
       * @param in 输入流
       * @return 字符串
       * @throws UnsupportedEncodingException 字符转换异常
       * @throws IOException IO异常
       */
      public static String inputStream2String(InputStream in)
              throws UnsupportedEncodingException, IOException {
          if (in == null) {
              return "";
          }
  
          StringBuilder out = new StringBuilder();
          byte[] b = new byte[4096];
          for (int n; (n = in.read(b)) != -1;) {
              out.append(new String(b, 0, n, "UTF-8"));
          }
          return out.toString();
      }
  }
  