Android开发之与服务器（jsp）发送、接受JSON数据

Android端向服务器端发送JSON数据。服务器接受到数据后返回JSON信息。

Android效果图：

      

                            未点击“发送”                                                                 点击“发送”，获取数据

服务端效果图：

android代码：

public class MainActivity extends AppCompatActivity {

    //地址，请根据自己的地址设置
    public final static String MyURL = "http://192.168.1.100:8080/JsonDeal/Deal";
    private Button but;
    private TextView tv;
    private JSONObject object;

    Handler handler;

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

        handler = new Handler();
        but = (Button) this.findViewById(R.id.but);
        tv = (TextView) this.findViewById(R.id.tv);

        try {

            object = new JSONObject();
            object.put("client", "我是客户端来的");
        } catch (JSONException e) {
            e.printStackTrace();
        }

        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                new Thread() {
                    @Override
                    public void run() {

                        super.run();
                        submit();
                    }
                }.start();
            }
        });
    }


    public void submit() {
        try {
            URL url = new URL(MyURL);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("ser-Agent", "Fiddler");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setConnectTimeout(5 * 1000);
            // 包装并上传数据
            OutputStream outputStream = conn.getOutputStream();
            outputStream.write(URLEncoder.encode(object.toString(), "UTF-8").getBytes());

            // 如果请求响应码是200，则表示成功
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {

                //获取服务器上的数据
                BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
                try {
                    //解码
                    String jsonStr = URLDecoder.decode(in.readLine(), "UTF-8");
                    final JSONObject objectT = new JSONObject(jsonStr);
                    Log.i("objectT", objectT.getString("server"));

                    //更新TextView组件
                    handler.post(new Runnable() {
                        @Override
                        public void run() {

                            try {
                                tv.setText(objectT.getString("server"));
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    });

                } catch (JSONException e) {
                    e.printStackTrace();
                }
                in.close();
                conn.disconnect();
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (SocketTimeoutException e) {

            handler.post(new Runnable() {
                @Override
                public void run() {

                    Toast.makeText(MainActivity.this, "连接超时", Toast.LENGTH_SHORT).show();
                    return;
                }
            });

        }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

服务器代码（jsp）

Deal.java

public class Deal extends HttpServlet {
	public Deal() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");
		//获取数据
		InputStream inputStream = request.getInputStream();
		String json = NetUtils.readString(inputStream);
		json = URLDecoder.decode(json, "UTF-8");
		JSONObject jsonT = JSONObject.fromObject(json);
		System.out.println(jsonT.getString("client"));

		
		JSONObject jsonObject = new JSONObject();
		jsonObject.put("server", "我从服务器来");
		
		String serverStr = URLEncoder.encode(jsonObject.toString(), "UTF-8");
		
		//发送数据
		PrintWriter printWriter = response.getWriter();
		printWriter.write(serverStr);
		
		

	}

	public void init() throws ServletException {
		// Put your code here
	}

}

NetUtils.java

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class NetUtils {

	public static byte[] readBytes(InputStream is) {
		try {
			byte[] buffer = new byte[1024];
			int len = -1;
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			while ((len = is.read(buffer)) != -1) {
				baos.write(buffer, 0, len);
			}
			baos.close();
			return baos.toByteArray();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String readString(InputStream is) {
		return new String(readBytes(is));
	}

}

源码：

android源码（android studio）和jsp源码