Android客户端与服务器交互方式（1）

Android客户端与服务器交互方式(1)

Android客户端与服务器端的数据交互有多种，最常见的就是webservice和json。

为了与服务器端交互主要通过通信协议，常用的就是Http和TCP。Http基于TCP，TCP协议对应传输层，Http协议对应应用层。当客户端需要从服务器获取数据的时候，会发出一次Http请求。Http会通过TCP建立起一个到服务器的连接通道，当本次请求需要的数据完毕后，Http会立即将TCP连接断开。

而xmlrpc，ssh的json就是这两种协议扩展来的。

使用webservices传输XML文件比较简单及通用，如果对数据大小及传输速度有要求的话就用json更合适。

此次讲的就是通过json进行数据交互。

所谓的通过json进行数据交互其实就是在客户端将数据转换为json字符串发送给服务器，服务器接送到后将json转换会原数据进行处理。那么客户端怎么发送json呢，即通过Http协议的Post或Get方法。

废话不多说上代码

1. android端

2.

package com.example.helloworld;

public class MainActivity extends ActionBarActivity {

private String responseMsg = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//Intent intent = new Intent(MainActivity.this, InfoActivity.class);
//startActivity(intent);
Thread loginThread = new Thread(new LoginThread());
loginThread.start();
}
});

}

public HttpClient getHttpClient(){
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, 5*1000);
HttpConnectionParams.setSoTimeout(httpParams, 10*1000);
HttpClient client = new DefaultHttpClient(httpParams);
return client;
}

private void sendJson(){
//boolean loginValidate = false;
String urlStr = "http://192.168.1.24:8080/servletTest/test";
HttpPost post = new HttpPost(urlStr);
try{
//向服务器写json
JSONObject json1 = new JSONObject();
//Object email = null;
Object email = "hlelo";
json1.put("email", email);
//Object pwd = null;
Object pwd = "wodls";
json1.put("password", pwd);

System.out.println("=============="+json.toString());
//保证json数据不是乱码
StringEntity se = new StringEntity(json.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);

//发送json给服务器

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HttpClient httpClient = getHttpClient();
HttpResponse httpResponse = httpClient.execute(post);

/*int httpCode = httpResponse.getStatusLine().getStatusCode();
if(httpCode == HttpURLConnection.HTTP_OK && httpResponse != null){
//org.apache.http.Header[] headers = httpResponse.getAllHeaders();
HttpEntity entity = httpResponse.getEntity();
//org.apache.http.Header header = httpResponse.getFirstHeader("content-type");
//读取服务器返回的json
InputStream inputStream = entity.getContent();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader reader = new BufferedReader(inputStreamReader);
String s;
while((s= reader.readLine())!= null){
result.append(s);
}
reader.close();

JSONObject jsonObject = new JSONObject(result.toString());
String nameString = jsonObject.getString("email");
String passString = jsonObject.getString("password");
System.out.println("===============email is: "+nameString+", password is: "+passString);*/
}catch(Exception exception){
exception.printStackTrace();
}
}

class LoginThread implements Runnable{
public void run(){
sendJson();
}
}
}

2.servlet端

package cn.dragon.servlet;

public class ServletDemoFirst extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
//处理json内容
response.setCharacterEncoding("UTF-8");
response.setContentType("text/json");
String acceptjson = "";
try {
BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream(), "utf-8"));
StringBuffer sb = new StringBuffer("");
String temp;
while((temp = br.readLine()) != null){
sb.append(temp);
}
br.close();
　　　　　　  //以上的过程都从request中读取json，并将json转换成string，这样可以显示出来。最终String类型的json就是acceptjson　　
acceptjson = sb.toString();
System.out.println("=======json is==========="+acceptjson);
if(acceptjson != ""){
//System.out.println("get the json successfully");
JSONObject jo = JSONObject.fromObject(acceptjson);
　　　　　　　　　　//email即是android端发送过来的json当中的一个key，我们使用get方法读取对应的value
System.out.println(jo.get("email"));
}
else{
System.out.println("get the json failed");
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

}

参考出处：1.http://blog.csdn.net/panfb227

2.http://www.cnblogs.com/zhawj159753/p/3949956.html