简单的android客户端servlet服务端的交互

android客户端通过GET方式发送数据到服务端，服务端获得数据后，从服务端获取数据库里的信息，并以JSON数据格式返回。

1、GET方式传参的格式：
http://127.0.0.1/AndroidService/android/upload?title=aaa&timelength=90的形式

参数是？后的title=aaa&timelength=90。多个参数用&连接。

2、连接服务器发送请求参数并获得服务器返回的数据，客户端获得数据后，主要是对JSON数据的一些解析。

/**

* 获得服务器的数据

* @param url

* @return

*/

public static String connect(URL url){

InputStream inputStream=null;

HttpURLConnection connection=null;

StringBuffer sb=null;

try {

connection=(HttpURLConnection) url.openConnection();

connection.setConnectTimeout(3000);

connection.setRequestMethod("GET");

connection.setDoOutput(true);

connection.setDoInput(true);

if(connection.getResponseCode()==200){

inputStream=connection.getInputStream();

//对应的字符编码转换

Reader reader = new InputStreamReader(inputStream, "UTF-8");

BufferedReader bufferedReader = new BufferedReader(reader);

String str = null;

sb = new StringBuffer();

while ((str = bufferedReader.readLine()) != null) {

sb.append(str);

}

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

if(inputStream!=null){

try {

inputStream.close();

inputStream=null;

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

if(connection!=null){

connection.disconnect();

connection=null;

}

}

return new String(sb);

}

3、JSON数据解析

首先取出JSON对象，然后用GET方法按键值对的形式取出JSON对象里面的数据。

服务端主要是一个Servlet,通过doGet()和doPost()方法把提交的参数进行处理，并返回数据。把该WEB工程部署到Tomcat服务器里就OK了如下：

public class MyTest extends HttpServlet {

//private List<GpsInfo> infos;

private JSONArray infos;

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

//super.doGet(req, resp);注释掉，否则总是没有返回数据给客户端

req.setCharacterEncoding("UTF-8");

resp.setContentType("text/html;charset=utf-8");

resp.setCharacterEncoding("utf-8");

//查询服务器端数据库并获得返回值

infos=new JSONArray();

PrintWriter out=resp.getWriter();

//ServletOutputStream out = resp.getOutputStream();

//重要！！！编码格式！！！

String s = new String(req.getParameter("name").getBytes("iso-8859-1"),"UTF-8");

System.out.println(s);

infos=DbUtis.getData(s);

//JSONObject object=new JSONObject();

System.out.println("返回客户端的数据："+infos.toString());

//把数据写入响应

out.write(infos.toString());

out.flush();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

out.close();

}

//doPost(req,resp);

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

//super.doPost(req, resp);

doGet(req,resp);

}

}

服务器端操作数据库的类：

public class MyTest extends HttpServlet {

//private List<GpsInfo> infos;

private JSONArray infos;

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

//super.doGet(req, resp);

req.setCharacterEncoding("UTF-8");

resp.setContentType("text/html;charset=utf-8");

resp.setCharacterEncoding("utf-8");

//查询服务器端数据库并获得返回值

infos=new JSONArray();

PrintWriter out=resp.getWriter();

//ServletOutputStream out = resp.getOutputStream();

try {

/*byte[] titleByte = request.getParameter("title").getBytes("iso-8859-1"); //获得title参数对应的二进制数据

title = new String(titleByte, "UTF-8"); */

String s = new String(req.getParameter("name").getBytes("iso-8859-1"),"UTF-8");

System.out.println(s);

infos=DbUtis.getData(s);

//JSONObject object=new JSONObject();

System.out.println("返回客户端的数据："+infos.toString());

out.write(infos.toString());

//System.out.println("返回客户端的数据2："+out.toString());

out.flush();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

out.close();

}

//doPost(req,resp);

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

//super.doPost(req, resp);

doGet(req,resp);

}

}

web.xml的配置：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name></display-name>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>







<servlet>



<servlet-name>MyTest</servlet-name>

<servlet-class>MyTest</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>MyTest</servlet-name>

<url-pattern>/MyTest</url-pattern>

</servlet-mapping>



</web-app>

注意：如果用用360共享WIFI测试的时候用的是无线网卡的IP，不是以太网的IP。