Android网络编程之http发送/请求服务

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最近在学习Android网络编程的知识，以下是今晚学习的一些心得。与大家共同分享。
在实际的应用开发中很多时候需要app向服务器请求数据，那么app如何发送请求呢？下面的代码就是其中的一种情况，使用HttpURLConnection向服务器发送请求的数据，然后处理服务器返回的数据。

下面的代码只是客户端的一个简答测试代码。还需要在pc上安装一个 tomcat服务器，然后将demo中的jsp文件部署到tomcat上，具体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";//根据自己主机的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

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