Android中与服务器通信

    服务器开发语言我选择的是php

    服务器搭建完成之后，在服务器www目录下写一个demo.php,php的代码如下：

   <?php
    if($_POST['username'] == "admin"){
        echo "admin";
    }else{
        echo "user";
    }
?>

  然后在安卓中向该服务器发送请求：

 

public class http extends AppCompatActivity {

    HttpUtil httpUtil;
    TextView textView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_http);
httpUtil = new HttpUtil();
        Button button = (Button)findViewById(R.id.send);
textView = (TextView)findViewById(R.id.text3);
        button.setOnClickListener(new View.OnClickListener() {
@Override
            public void onClick(View view) {
              String str =   httpUtil.sendHttpRequest("http://115.159.217.226/demo.php");
textView.setText(str);
            }
        });
    }
}
  先写一个http类，调用我自己写的sendHttpRequest()；方法

  方法的代码如下：
public class HttpUtil {
private OkHttpClient client;
private Request request;
private Response response;
public String str;
public String sendHttpRequest(final String address){
new Thread(new Runnable() {
            String responseData;
public void run() {
try{
client = new OkHttpClient();
                    RequestBody requestBody = new FormBody.Builder()
                            .add("username","admin")
                            .build();
request = new Request.Builder()
                            .url(address)
                            .post(requestBody)
                            .build();
response = client.newCall(request).execute();
responseData = response.body().string();
str = responseData;
                }catch (Exception e){
                    e.printStackTrace();

                }
            }
        }).start();
return str;
    }
}
 最后得到数据为admin,向php服务器通信成功