Android的网络应用-使用Apache HttpClient

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　　Android的网络应用-使用Apache HttpClient
　　实例：访问被保护资源
　　创建项目：HttpClientTest
　　此项目要部署Web服务器，这里使用的Tomcat 7.0,在webApps目录下创建foo目录，并部署相应的文件
　　即foo/secret.jsp,foo/login.jsp
　　
　　项目运行结果：
　　没有登录的情况下，访问被保护界面：

　　
　　登陆系统：

　　
　　
　　登录成功后访问界面：

　　
　　main.xml










　　


　　login.xml












　　



package org.wwj.net;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
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 org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class HttpClientTest extends Activity
{
Button get;
Button login;
EditText response;
HttpClient httpClient;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 创建DefaultHttpClient对象
httpClient = new DefaultHttpClient();
get = (Button) findViewById(R.id.get);
login = (Button) findViewById(R.id.login);
response = (EditText) findViewById(R.id.response);
get.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
// 创建一个HttpGet对象
HttpGet get = new HttpGet(
"http://183.30.191.50:8080/foo/secret.jsp");
try
{
// 发送GET请求
HttpResponse httpResponse = httpClient.execute(get);
HttpEntity entity = httpResponse.getEntity();
if (entity != null)
{
// 读取服务器响应
BufferedReader br = new BufferedReader(
new InputStreamReader(entity.getContent()));
String line = null;
response.setText("");
while ((line = br.readLine()) != null)
{
// 使用response文本框显示服务器响应
response.append(line + "\n");
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
login.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
final View loginDialog = getLayoutInflater().inflate(
R.layout.login, null);
new AlertDialog.Builder(HttpClientTest.this)
.setTitle("登录系统")
.setView(loginDialog)
.setPositiveButton("登录",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
String name = ((EditText) loginDialog
.findViewById(R.id.name)).getText()
.toString();
String pass = ((EditText) loginDialog
.findViewById(R.id.pass)).getText()
.toString();
HttpPost post = new HttpPost(
"http://183.30.191.50:8080/foo/login.jsp");
// 如果传递参数个数比较多的话可以对传递的参数进行封装
List params = new ArrayList();
params
.add(new BasicNameValuePair("name", name));
params
.add(new BasicNameValuePair("pass", pass));
try
{
// 设置请求参数
post.setEntity(new UrlEncodedFormEntity(
params, HTTP.UTF_8));
// 发送POST请求
HttpResponse response = httpClient
.execute(post);
// 如果服务器成功地返回响应
if (response.getStatusLine()
.getStatusCode() == 200)
{
String msg = EntityUtils
.toString(response.getEntity());
// 提示登录成功
Toast.makeText(HttpClientTest.this,
msg, 5000).show();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}).setNegativeButton("取消", null).show();
}
});
}
}