简单使用URLConnection、HttpURLConnection和HttpClient访问网络资源 - Android编程 - 软件开发资源站

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简单使用URLConnection、HttpURLConnection和HttpClient访问网络资源
类别：Android编程作者：码皇来源：互联网点击：

URL的openConnection方法将返回一个URLConnection，该对象表示应用程序和URL之间的通信连接。程序可以通过它的实例向该URL发送请求，读取URL引用的资源。下面通过一个简单示例来演示：Activity：package com ho

URL的openConnection方法将返回一个URLConnection，该对象表示应用程序和URL之间的通信连接。程序可以通过它的实例向该URL发送请求，读取URL引用的资源。

下面通过一个简单示例来演示：

Activity：

package com.home.urlconnection;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private Button urlConnectionBtn;
private Button httpUrlConnectionBtn;
private Button httpClientBtn;
private TextView showTextView;
private WebView webView;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
urlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_urlconnection);
httpUrlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_httpurlconnection);
httpClientBtn = (Button) findViewById(R.id.test_url_main_btn_httpclient);
showTextView = (TextView) findViewById(R.id.test_url_main_tv_show);
webView = (WebView) findViewById(R.id.test_url_main_wv);
urlConnectionBtn.setOnClickListener(this);
httpUrlConnectionBtn.setOnClickListener(this);
httpClientBtn.setOnClickListener(this);
}
@Override public void onClick(View v) {
if (v == urlConnectionBtn) {
try {
// 直接使用URLConnection对象进行连接 URL url = new URL("http://192.168.1.100:8080/myweb/hello.jsp");
// 得到URLConnection对象 URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
byte[] bs = new byte[1024];
int len = 0;
StringBuffer sb = new StringBuffer();
while ((len = is.read(bs)) != -1) {
String str = new String(bs, 0, len);
sb.append(str);
}
showTextView.setText(sb.toString());
}
catch (Exception e) {
e.printStackTrace();
}
}
if (v == httpUrlConnectionBtn) {
// 直接使用HttpURLConnection对象进行连接 try {
URL url = new URL( "http://192.168.1.100:8080/myweb/hello.jsp?username=abc");
// 得到HttpURLConnection对象 HttpURLConnection connection = (HttpURLConnection) url .openConnection();
// 设置为GET方式 connection.setRequestMethod("GET");
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
// 得到响应消息 String message = connection.getResponseMessage();
showTextView.setText(message);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
if (v == httpClientBtn) {
try {
// 使用ApacheHttp客户端进行连接(重要方法) HttpClient client = new DefaultHttpClient();
// 如果是Get提交则创建HttpGet对象，否则创建HttpPost对象 // POST提交的方式 HttpPost httpPost = new HttpPost( "http://192.168.1.100:8080/myweb/hello.jsp");
// 如果是Post提交可以将参数封装到集合中传递 List dataList = new ArrayList();
dataList.add(new BasicNameValuePair("username", "abc"));
dataList.add(new BasicNameValuePair("pwd", "123"));
// UrlEncodedFormEntity用于将集合转换为Entity对象 httpPost.setEntity(new UrlEncodedFormEntity(dataList));
// GET提交的方式 // HttpGet httpGet = new // HttpGet("http://192.168.1.100:8080/myweb/hello.jsp?username=abc&pwd=321");
// 获取相应消息 HttpResponse httpResponse = client.execute(httpPost);
// 获取消息内容 HttpEntity entity = httpResponse.getEntity();
// 把消息对象直接转换为字符串 String content = EntityUtils.toString(entity);
// 显示在TextView中 // showTextView.setText(content);
// 通过webview来解析网页 webView.loadDataWithBaseURL(null, content, "text/html", "utf-8", null);
// 直接根据url来进行解析 // webView.loadUrl(url);
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
package com.home.urlconnection;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private Button urlConnectionBtn;
private Button httpUrlConnectionBtn;
private Button httpClientBtn;
private TextView showTextView;
private WebView webView;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
urlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_urlconnection);
httpUrlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_httpurlconnection);
httpClientBtn = (Button) findViewById(R.id.test_url_main_btn_httpclient);
showTextView = (TextView) findViewById(R.id.test_url_main_tv_show);
webView = (WebView) findViewById(R.id.test_url_main_wv);
urlConnectionBtn.setOnClickListener(this);
httpUrlConnectionBtn.setOnClickListener(this);
httpClientBtn.setOnClickListener(this);
}
@Override public void onClick(View v) {
if (v == urlConnectionBtn) {
try {
// 直接使用URLConnection对象进行连接 URL url = new URL("http://192.168.1.100:8080/myweb/hello.jsp");
// 得到URLConnection对象 URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
byte[] bs = new byte[1024];
int len = 0;
StringBuffer sb = new StringBuffer();
while ((len = is.read(bs)) != -1) {
String str = new String(bs, 0, len);
sb.append(str);
}
showTextView.setText(sb.toString());
}
catch (Exception e) {
e.printStackTrace();
}
}
if (v == httpUrlConnectionBtn) {
// 直接使用HttpURLConnection对象进行连接 try {
URL url = new URL( "http://192.168.1.100:8080/myweb/hello.jsp?username=abc");
// 得到HttpURLConnection对象 HttpURLConnection connection = (HttpURLConnection) url .openConnection();
// 设置为GET方式 connection.setRequestMethod("GET");
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
// 得到响应消息 String message = connection.getResponseMessage();
showTextView.setText(message);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
if (v == httpClientBtn) {
try {
// 使用ApacheHttp客户端进行连接(重要方法) HttpClient client = new DefaultHttpClient();
// 如果是Get提交则创建HttpGet对象，否则创建HttpPost对象 // POST提交的方式 HttpPost httpPost = new HttpPost( "http://192.168.1.100:8080/myweb/hello.jsp");
// 如果是Post提交可以将参数封装到集合中传递 List dataList = new ArrayList();
dataList.add(new BasicNameValuePair("username", "abc"));
dataList.add(new BasicNameValuePair("pwd", "123"));
// UrlEncodedFormEntity用于将集合转换为Entity对象 httpPost.setEntity(new UrlEncodedFormEntity(dataList));
// GET提交的方式 // HttpGet httpGet = new // HttpGet("http://192.168.1.100:8080/myweb/hello.jsp?username=abc&pwd=321");
// 获取相应消息 HttpResponse httpResponse = client.execute(httpPost);
// 获取消息内容 HttpEntity entity = httpResponse.getEntity();
// 把消息对象直接转换为字符串 String content = EntityUtils.toString(entity);
// 显示在TextView中 // showTextView.setText(content);
// 通过webview来解析网页 webView.loadDataWithBaseURL(null, content, "text/html", "utf-8", null);
// 直接根据url来进行解析 // webView.loadUrl(url);
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}

上面使用到的url是部署在笔者本机的web应用，这里不再给出，大家可以换成自己的web应用即可。
布局XML：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/test_url_main_btn_urlconnection" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用URLConnection连接" /> <Button android:id="@+id/test_url_main_btn_httpurlconnection" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用HttpURLConnection连接" /> <Button android:id="@+id/test_url_main_btn_httpclient" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用Apache客户端连接" /> <TextView android:id="@+id/test_url_main_tv_show" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <WebView android:id="@+id/test_url_main_wv" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/test_url_main_btn_urlconnection" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用URLConnection连接" /> <Button android:id="@+id/test_url_main_btn_httpurlconnection" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用HttpURLConnection连接" /> <Button android:id="@+id/test_url_main_btn_httpclient" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="使用Apache客户端连接" /> <TextView android:id="@+id/test_url_main_tv_show" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <WebView android:id="@+id/test_url_main_wv" android:layout_width="match_parent" android:layout_height="match_parent" /></LinearLayout>

权限：

<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.INTERNET" />

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简单使用URLConnection、HttpURLConnection和HttpClient访问网络资源 类别：Android编程 作者：码皇 来源：互联网 点击：

简单使用URLConnection、HttpURLConnection和HttpClient访问网络资源
类别：Android编程作者：码皇来源：互联网点击：