http get post 请求

1       建立Http连接的步骤：

1.1      获得一个http的连接地址(如：String httpurl = "http://192.168.0.68:8090/Test/index.jsp?par=this-is-get-Method-request!";)

1.2      构造一个URL对象(如：url = new URL(httpurl);)

1.3      使用HttpURLConnection打开一个连接(如：HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();)

1.4      得到读取的内容(流)(如：InputStream inputStream = httpConnection.getInputStream();)

2     TestHttpGetPostActivity：

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class TestHttpGetPostActivity extends Activity
{
    private Button mButton01;
    private Button mButton02;
    private Button mButton03;
    private String data = null;
    private TextView mTextView;
    private Intent intent = new Intent();
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mButton01 = (Button) findViewById(R.id.get);
        mButton02 = (Button) findViewById(R.id.post);
        mButton03 = (Button) findViewById(R.id.nothing);
        mTextView = (TextView) findViewById(R.id.textview);
        mButton01.setOnClickListener(listener);
        mButton02.setOnClickListener(listener);
        mButton03.setOnClickListener(listener);
    }

    private OnClickListener listener = new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            switch (v.getId())
            {
                // get请求
                case R.id.get:
                    try
                    {
                        String httpurl = "http://192.168.0.68:8090/Test/index.jsp?par=this-is-get-Method-request!";
                        URL url;
                        url = new URL(httpurl);
                        if (url != null)
                        {
                            // 使用HttpURLConnection打开网络连接
                            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
                            InputStream inputStream = httpConnection.getInputStream();
                            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                            while (bufferedReader.readLine() != null)
                            {
                                data += bufferedReader.readLine() + "\n";
                            }
                            // 关闭inputStream
                            inputStream.close();
                            // 关闭http连接
                            httpConnection.disconnect();
                            System.out.println("data = " + data);
                            if (data != null)
                            {
                                intent.putExtra("data", data);
                                intent.setClass(TestHttpGetPostActivity.this, ShowHtmlContent.class);
                                startActivity(intent);
                            }
                            else
                            {
                                mTextView.setText("data is NULL!");
                            }
                        }
                    }
                    catch (MalformedURLException e)
                    {
                        e.printStackTrace();
                    }
                    catch (IOException e)
                    {
                        mTextView.setText("url is NULL!");
                        e.printStackTrace();
                    }
                    break;

                // post请求
                case R.id.post:
                    try
                    {
                        String httpurl = "http://192.168.0.68:8090/Test/index.jsp";
                        URL url;
                        url = new URL(httpurl);
                        if (url != null)
                        {
                            // 使用HttpURLConnection打开网络连接
                            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
                            // 因为是post请求，需要设置成true
                            httpConnection.setDoInput(true);
                            httpConnection.setDoOutput(true);
                            // 设置post请求方式
                            httpConnection.setRequestMethod("POST");
                            // post请求不能使用缓存
                            httpConnection.setUseCaches(false);
                            httpConnection.setInstanceFollowRedirects(true);

                            // 配置本次连接的Content-type，配置为application/x-www-form-urlencoded
                            httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                            // 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成
                            // 要注意的是connection.getOutputSream会隐含地进行connect.urlConn.connect();
                            // DataOutputSream流
                            DataOutputStream outputStream = new DataOutputStream(httpConnection.getOutputStream());
                            // 要上传的参数
                            String content = "par=" + URLEncoder.encode("this is post request!", "gb2312");
                            // 将要上传的内容写入流中
                            outputStream.writeBytes(content);
                            // 刷新，关闭
                            outputStream.flush();
                            outputStream.close();
                            InputStream inputStream = httpConnection.getInputStream();
                            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                            while (bufferedReader.readLine() != null)
                            {
                                data += bufferedReader.readLine() + "\n";
                            }
                            // 关闭inputStream
                            inputStream.close();
                            // 关闭http连接
                            httpConnection.disconnect();
                            System.out.println("data = " + data);
                            if (data != null)
                            {
                                intent.putExtra("data", data);
                                intent.setClass(TestHttpGetPostActivity.this, ShowHtmlContent.class);
                                startActivity(intent);
                            }
                            else
                            {
                                mTextView.setText("data is NULL!");
                            }
                        }
                    }
                    catch (MalformedURLException e)
                    {
                        e.printStackTrace();
                    }
                    catch (IOException e)
                    {
                        mTextView.setText("url is NULL!");
                        e.printStackTrace();
                    }
                    break;
                case R.id.nothing:
                    try
                    {
                        String httpurl = "http://192.168.0.68:8090/Test/index.jsp";
                        URL url;
                        url = new URL(httpurl);
                        if (url != null)
                        {
                            // 使用HttpURLConnection打开网络连接
                            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
                            InputStream inputStream = httpConnection.getInputStream();
                            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                            while (bufferedReader.readLine() != null)
                            {
                                data += bufferedReader.readLine() + "\n";
                            }
                            // 关闭inputStream
                            inputStream.close();
                            // 关闭http连接
                            httpConnection.disconnect();
                            System.out.println("data = " + data);
                            if (data != null)
                            {
                                intent.putExtra("data", data);
                                intent.setClass(TestHttpGetPostActivity.this, ShowHtmlContent.class);
                                startActivity(intent);
                            }
                            else
                            {
                                mTextView.setText("data is NULL!");
                            }
                        }
                    }
                    catch (MalformedURLException e)
                    {
                        e.printStackTrace();
                    }
                    catch (IOException e)
                    {
                        mTextView.setText("url is NULL!");
                        e.printStackTrace();
                    }
                    break;
            }
        }
    };
}

3       ShowHtmlContent：

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class ShowHtmlContent extends Activity
{
    private TextView mTextView;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.http);
        mTextView = (TextView) findViewById(R.id.textview);
        Intent intent = ShowHtmlContent.this.getIntent();
        String dataString = intent.getStringExtra("data");
        if (dataString != null)
        {
            mTextView.setText(dataString);
        }
        else
        {
            mTextView.setText("nothing to show!");
        }
    }
}

4    效果图