首先是Get：

布局非常easy。就一个button，主要看一下MainActivity吧：

package com.francis.httpget;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

public class MyActivity extends Activity {

    BufferedReader bufferedReader;

    InputStreamReader inputStreamReader;

    InputStream inputStream;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_my);

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                new AsyncTask<String,Void,Void>() {

                    @Override

                    protected Void doInBackground(String... params) {

                        try {

                            URL url = new URL(params[0]);

                            URLConnection connection = url.openConnection();

                            inputStream = connection.getInputStream();

                            inputStreamReader = new InputStreamReader(inputStream,"UTF-8");

                            bufferedReader = new BufferedReader(inputStreamReader);

                            String line;

                            while (true) {

                                if ((line = bufferedReader.readLine()) != null) {

                                    System.out.println(line);

                                }

                            }

                        } catch (Exception e) {

                            e.printStackTrace();

                        } finally {

                            try {

                                bufferedReader.close();

                                inputStreamReader.close();

                                inputStream.close();

                            } catch (IOException e) {

                                e.printStackTrace();

                            }

                        }

                        return null;

                    }

                }.execute("http://fanyi.youdao.com/openapi.do?keyfrom=HttpGetFrancis&key=893755706&type=data&doctype=xml&version=1.1&q=这里是有道翻译API");

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.my, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

}

url为有道翻译提供的API,很方便。控制台输出如图：

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZnJhbmNpc3NoaQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">

接着是Post：

非常easy，这里仅仅给出提交post请求的Button的点击事件：

和Get相比有2点须要注意：

1.url与參数是分开的；

2.connection.setDoInput(true);

   connection.setDoOutput(true);

   connection.setRequestMethod("POST");

// Post

        findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                new AsyncTask<String,Void,Void>() {

                    @Override

                    protected Void doInBackground(String... params) {

                        try {

                            URL url = new URL(params[0]);

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

                            connection.setDoInput(true);

                            connection.setDoOutput(true);

                            connection.setRequestMethod("POST");

                            outputStream = connection.getOutputStream();

                            outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8");

                            bufferedWriter = new BufferedWriter(outputStreamWriter);

                            bufferedWriter.write("keyfrom=HttpGetFrancis&key=893755706&type=data&doctype=xml&version=1.1&q=这里是有道翻译API");

                            bufferedWriter.flush();

                            inputStream = connection.getInputStream();

                            inputStreamReader = new InputStreamReader(inputStream,"UTF-8");

                            bufferedReader = new BufferedReader(inputStreamReader);

                            String line;

                            while (true) {

                                if ((line = bufferedReader.readLine()) != null) {

                                    System.out.println(line);

                                }

                            }

                        } catch (Exception e) {

                            e.printStackTrace();

                        } finally {

                            try {

                                bufferedReader.close();

                                inputStreamReader.close();

                                inputStream.close();

                            } catch (IOException e) {

                                e.printStackTrace();

                            }

                        }

                        return null;

                    }

                }.execute("http://fanyi.youdao.com/openapi.do");

            }

        });