异步HTTP请求

一、自定义异步的HTTP请求

1.自定义一个AsyncHttpClient类，用于处理HTTP请求，实际原理就是新开启一个线程，调用HttpClient处理GET和POST请求

package com.shz.services;

import java.util.List;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import android.os.Message;

public class MyAsyncHttpClient {

    public void get(final String url,final MyHandler handler)

    {

        new Thread(){

            public void run() {

                Message msg = new Message();

                try {

                    HttpClient client = new DefaultHttpClient();

                    HttpGet httpGet = new HttpGet(url);

                    HttpResponse response = client.execute(httpGet);

                    int code = response.getStatusLine().getStatusCode();

                    if(code == 200)

                    {

                        msg.what = 1;

                        msg.obj = loginService.readInputStream(response.getEntity().getContent());

                    }

                    else

                    {

                        msg.what = 2;

                        msg.obj = "请求失败，错误码："+code;

                    }

                } catch (Exception e) {

                    msg.what = 2;

                    msg.obj = e.getMessage();

                } finally{

                    handler.sendMessage(msg);

                }

            };

        }.start();

    }

    public void post(final String url,final List<NameValuePair> pairs,final MyHandler handler)

    {

        new Thread(){

            public void run() {

                Message msg = new Message();

                try {

                    HttpClient client = new DefaultHttpClient();

                    HttpPost post = new HttpPost(url);

                    if(pairs != null)

                    {

                        post.setEntity(new UrlEncodedFormEntity(pairs, "UTF-8"));

                    }

                    HttpResponse response = client.execute(post);

                    int code = response.getStatusLine().getStatusCode();

                    if(code == 200)

                    {

                        msg.what = 1;

                        msg.obj = loginService.readInputStream(response.getEntity().getContent());

                    }

                    else

                    {

                        msg.what = 2;

                        msg.obj = "请求失败，错误码："+code;

                    }

                } catch (Exception e) {

                    msg.what = 2;

                    msg.obj = e.getMessage();

                } finally{

                    handler.sendMessage(msg);

                }

            };

        }.start();

    }

}

2.处理服务器返回消息的MyHandler类，该类继承Handler

package com.shz.services;

import android.os.Handler;

import android.os.Message;

public class MyHandler extends Handler {

    public void onSuccess(String content) {

    }

    public void onFailure(String content) {

    }

    @Override

    public void handleMessage(Message msg) {

        super.handleMessage(msg);

        switch (msg.what) {

        case 1:

            onSuccess(msg.obj.toString());

            break;

        case 2:

            onFailure(msg.obj.toString());

            break;

        default:

            break;

        }

    }

}

3.测试代码

package com.shz.login;

import java.net.URLEncoder;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.NameValuePair;

import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.Toast;

import com.shz.myasynchttp.R;

import com.shz.services.MyAsyncHttpClient;

import com.shz.services.MyHandler;

public class MainActivity extends Activity {

    private EditText txtUserName;

    private EditText txtPassword;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        this.txtUserName = (EditText)this.findViewById(R.id.txtUserName);

        this.txtPassword = (EditText)this.findViewById(R.id.txtPassword);

    }        

    public void loginGet(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login?UserName="

                + URLEncoder.encode(userName)

                + "&Password="

                + URLEncoder.encode(password);

        MyAsyncHttpClient client = new MyAsyncHttpClient();

        client.get(path, new MyHandler(){

            @Override

            public void onSuccess(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

            @Override

            public void onFailure(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

        });

    }    

    public void loginPost(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login";

        MyAsyncHttpClient client = new MyAsyncHttpClient();

        // 设置要提交的数据

        List<NameValuePair> pairs = new ArrayList<NameValuePair>();

        pairs.add(new BasicNameValuePair("UserName", userName));

        pairs.add(new BasicNameValuePair("Password", password));

        client.post(path, pairs, new MyHandler(){

            @Override

            public void onSuccess(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

            @Override

            public void onFailure(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

        });

    }  

}

布局代码

package com.shz.login;

import java.net.URLEncoder;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.NameValuePair;

import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.Toast;

import com.shz.myasynchttp.R;

import com.shz.services.MyAsyncHttpClient;

import com.shz.services.MyHandler;

public class MainActivity extends Activity {

    private EditText txtUserName;

    private EditText txtPassword;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        this.txtUserName = (EditText)this.findViewById(R.id.txtUserName);

        this.txtPassword = (EditText)this.findViewById(R.id.txtPassword);

    }        

    public void loginGet(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login?UserName="

                + URLEncoder.encode(userName)

                + "&Password="

                + URLEncoder.encode(password);

        MyAsyncHttpClient client = new MyAsyncHttpClient();

        client.get(path, new MyHandler(){

            @Override

            public void onSuccess(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

            @Override

            public void onFailure(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

        });

    }    

    public void loginPost(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login";

        MyAsyncHttpClient client = new MyAsyncHttpClient();

        // 设置要提交的数据

        List<NameValuePair> pairs = new ArrayList<NameValuePair>();

        pairs.add(new BasicNameValuePair("UserName", userName));

        pairs.add(new BasicNameValuePair("Password", password));

        client.post(path, pairs, new MyHandler(){

            @Override

            public void onSuccess(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

            @Override

            public void onFailure(String content) {

                Toast.makeText(MainActivity.this, content, 1).show();

            }

        });

    }  

}

二、使用GitHub上的异步Http开源框架

loopj/android-async-http

示例代码

package com.shz.login;

import java.net.URLEncoder;

import org.apache.http.Header;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;

import com.loopj.android.http.AsyncHttpResponseHandler;

import com.loopj.android.http.RequestParams;

import com.shz.asynchttp.R;

public class MainActivity extends Activity {

    private EditText txtUserName;

    private EditText txtPassword;

    private CheckBox cbRememberPwd;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        this.txtUserName = (EditText)this.findViewById(R.id.txtUserName);

        this.txtPassword = (EditText)this.findViewById(R.id.txtPassword);

        this.cbRememberPwd = (CheckBox)this.findViewById(R.id.cbRememberPwd);

    }        

    public void loginGet(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login?UserName="

                + URLEncoder.encode(userName)

                + "&Password="

                + URLEncoder.encode(password);

        AsyncHttpClient client = new AsyncHttpClient();

        client.get(path, new AsyncHttpResponseHandler() {

            @Override

            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {

                Toast.makeText(MainActivity.this, statusCode+":"+new String(responseBody), 1).show();

            }

            @Override

            public void onFailure(int statusCode, Header[] headers,

                    byte[] responseBody, Throwable error) {

                Toast.makeText(MainActivity.this, statusCode+":"+new String(responseBody), 1).show();

            }

        });

    }    

    public void loginPost(View view)

    {

        final String userName = this.txtUserName.getText().toString().trim();

        final String password = this.txtPassword.getText().toString().trim();

        if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(password))

        {

            Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_LONG).show();

            return;

        }

        String path = "http://192.168.1.101/MyWebSite/AndroidTest/Home/Login";

        RequestParams params = new RequestParams();

        params.put("UserName", userName);

        params.put("Password", password);

        AsyncHttpClient client = new AsyncHttpClient();

        client.post(path, params, new AsyncHttpResponseHandler() {

            @Override

            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {

                Toast.makeText(MainActivity.this, statusCode+":"+new String(responseBody), 1).show();

            }

            @Override

            public void onFailure(int statusCode, Header[] headers,

                    byte[] responseBody, Throwable error) {

                Toast.makeText(MainActivity.this, statusCode+":"+new String(responseBody), 1).show();

            }

        });

    }  

}

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