android 学习随笔十一(网络：HttpClient框架)

1、使用HttpClient框架发送get、post请求

google收集apache提供的一个发送Http请求框架

public class Tools {

    public static String getTextFromStream(InputStream is){
        byte[] b = new byte[1024];
        int len;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            while((len = is.read(b)) != -1){
                bos.write(b, 0, len);
            }
            //把字节数组输出流转换成字节数组，然后用字节数组构造一个字符串
            String text = new String(bos.toByteArray());
            return text;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;

    }
}

public class MainActivity extends Activity {

    Handler handler = new Handler(){
        public void handleMessage(android.os.Message msg) {
            Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

　　//get请求
    public void click1(View v){
        //获取用户输入的账号密码
        EditText et_name = (EditText) findViewById(R.id.et_name);
        EditText et_pass = (EditText) findViewById(R.id.et_pass);

        String name = et_name.getText().toString();
        String pass = et_pass.getText().toString();

        final String path = "http://169.254.244.136/Web2/servlet/Login?name=" + URLEncoder.encode(name) + "&pass=" + pass;

        Thread t = new Thread(){
            @Override
            public void run() {
                //使用httpClient框架提交
                //1.创建client对象
                HttpClient client = new DefaultHttpClient();
                //2.创建get请求对象
                HttpGet get = new HttpGet(path);
                try {
                    //3.使用client发送get请求
                    HttpResponse response = client.execute(get);
                    //获取状态行
                    StatusLine line = response.getStatusLine();
                    //获取状态码
                    int code = line.getStatusCode();
                    if(code == 200){
                        //获取实体
                        HttpEntity entity = response.getEntity();
                        InputStream is = entity.getContent();
                        String text = Tools.getTextFromStream(is);

                        Message msg = handler.obtainMessage();
                        msg.obj = text;
                        handler.sendMessage(msg);
                    }

                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };
        t.start();
    }
    //Post请求
    public void click2(View v){
        //获取用户输入的账号密码
        EditText et_name = (EditText) findViewById(R.id.et_name);
        EditText et_pass = (EditText) findViewById(R.id.et_pass);

        final String name = et_name.getText().toString();
        final String pass = et_pass.getText().toString();

        final String path = "http://169.254.244.136/Web2/servlet/Login";

        Thread t = new Thread(){
            @Override
            public void run() {
                HttpClient client = new DefaultHttpClient();
                HttpPost post = new HttpPost(path);

                //把要提交的数据封装至post中
                List<NameValuePair> parameters = new ArrayList<NameValuePair>();
                //arg0:表单的名字
                //arg1:表单中的值
                BasicNameValuePair bnvp1 = new BasicNameValuePair("name", name);
                BasicNameValuePair bnvp2 = new BasicNameValuePair("pass", pass);
                //把BasicNameValuePair对象放入集合
                parameters.add(bnvp1);
                parameters.add(bnvp2);
                //创建实体对象
                UrlEncodedFormEntity entity = null;
                try {
                    //把集合对象封装到实体中
                    entity = new UrlEncodedFormEntity(parameters, "utf-8");
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                //把实体对象封装至post对象中
                post.setEntity(entity);
                try {
                    HttpResponse response = client.execute(post);

                    if(response.getStatusLine().getStatusCode() == 200){
                        InputStream is = response.getEntity().getContent();
                        String text = Tools.getTextFromStream(is);

                        Message msg = handler.obtainMessage();
                        msg.obj = text;
                        handler.sendMessage(msg);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
        t.start();
    }

}