Android网络编程http派/申请服务

最近的研究Android网络编程知识，这里有一些想法，今晚学习。与您分享。

在实际的应用程序的开发非常需要时间appserver请求数据，那么app怎样发送请求呢？以下的代码就是当中的一种情况。使用HttpURLConnection向server发送请求的数据，然后处理server返回的数据。

以下的代码仅仅是client的一个简答測试代码。还须要在pc上安装一个 tomcatserver ，然后将demo中的jsp文件部署到tomcat上。详细的方法百度一下便知。

package com.lee.nethttp;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintWriter;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.util.Base64;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

    private EditText mEditText = null;

    private Button mButton = null;

    private TextView mTextView = null;

    private String mUrl = "http://192.168.0.109:8080/lee/index.jsp";//依据自己主机的ip设置

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mEditText = (EditText) findViewById(R.id.edit);

        mButton = (Button) findViewById(R.id.button);

        mButton.setOnClickListener(mButtonClickListener);

        mTextView = (TextView) findViewById(R.id.text);

    }

    private OnClickListener mButtonClickListener = new OnClickListener() {

        @Override

        public void onClick(View v) {

            String content = mEditText.getText().toString();

            content = toBase64(content);

            String[] params = { content };

            new NetHttpAsyncTask().execute(params);

        }

    };

    private class NetHttpAsyncTask extends AsyncTask<String, Void, String> {

        @Override

        protected String doInBackground(String... params) {

            String result = null;

            try {

                URL url = new URL(mUrl);

                HttpURLConnection connection = (HttpURLConnection)url.openConnection();

                connection.setRequestMethod("POST");

                connection.setDoInput(true);

                connection.setDoOutput(true);

                connection.setUseCaches(false);

                connection.setRequestProperty("Content-type",

                        "application/x-www-form-urlencoded;charset=UTF-8");

                connection.setConnectTimeout(3000);

                connection.setReadTimeout(3000);

                PrintWriter writer = new PrintWriter(connection.getOutputStream());

                String str = "content" + "=" + params[0];

                writer.print(str);

                writer.flush();

                writer.close();

                InputStream input = connection.getInputStream();

                ByteArrayOutputStream outputBuffer = new ByteArrayOutputStream();

                int ch;

                while((ch = input.read()) != -1){

                    outputBuffer.write(ch);

                }

                result = outputBuffer.toString();

            } catch (IOException e) {

                e.printStackTrace();

            }

            return result;

        }

        @Override

        protected void onPostExecute(String result) {

            mTextView.setText(result);

        }

    }

    private String toBase64(String content){

        try {

            content = Base64.encodeToString(content.getBytes("UTF-8"), Base64.DEFAULT);

            Log.e("lee", "toBase64 content = " + content);

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

        return content;

    }

}

Demo 下载地址

秒客网

Android网络编程http派/申请服务

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