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
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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