使用HttpClient實作請求轉發功能

由于移動端要顯示業務系統的資料，但是業務系統衆多，如果直接和業務系統互動，會緊耦合，雜亂無章，不好管理，特編寫請求轉發元件，實作統一中轉。

本文基于HttpClient實作了GET和POST兩種方式：

GET請求：

 private String getContentFromUrlByGet(String url) {

  String content = "";

  try {

   HttpClient client = new HttpClient();

   GetMethod getMethod = new GetMethod(url);

   client.executeMethod(getMethod);

   InputStream stream = getMethod.getResponseBodyAsStream(); 

   int length;

   byte[] buffer = new byte[1024 * 4];

   StringBuffer stringBuffer = new StringBuffer();

   while ((length = stream.read(buffer)) != -1) {

    stringBuffer.append(new String(buffer, 0, length, "utf-8"));

   }

   content = new String(stringBuffer);

   getMethod.releaseConnection();

  } catch (Exception e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

  return content;

 }

POST請求：

 private String getContentFromUrlByPost(String url) {

  String content = "";

  try {

   HttpClient client = new HttpClient();

   PostMethod postMethod = new PostMethod(url);

   // 增加變量

   postMethod.addParameter("name", "name");

   postMethod.addParameter("pwd", "pwd");

   client.executeMethod(postMethod);

   InputStream stream = postMethod.getResponseBodyAsStream(); 

   int length;

   byte[] buffer = new byte[1024 * 4];

   StringBuffer stringBuffer = new StringBuffer();

   while ((length = stream.read(buffer)) != -1) {

    stringBuffer.append(new String(buffer, 0, length, "utf-8"));

   }

   content = new String(stringBuffer);

   postMethod.releaseConnection();

  } catch (Exception e) {

     e.printStackTrace();

  }

  return content;

 }