1 HttpURLConnection
2 HttpClient
HttpURLConnection使用过程：
1 获取HttpURLConnection的实例：
URL url = new URL（“http://www.baidu.com”）；
HttpURLConnection connection = （HttpURLConnection）url.openConnection;
2 设置请求的方法：GET POST 获取/提交
connection.setRequsestMethod(“get”);
3 自由设置
connection.setConnectionTimeout(8000);
connection.setReadTimeout(8000);
4 获取服务器返回的输入流
InputStream in = connection.getInputStream（）；
5 最后调用connection.disconnect();
实例：get
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/send_request"
android:text="Send Request"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/response_text"/>
</ScrollView>
</LinearLayout>
package com.example.networktest;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static final int SHOW_RESPONSE = 0;
private Button sendRquest;
private TextView responseText;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_RESPONSE:
String response = (String) msg.obj;
//进行UI操作
responseText.setText(response);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sendRquest = (Button) findViewById(R.id.send_request);
responseText = (TextView) findViewById(R.id.response_text);
sendRquest.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if(v.getId() == R.id.send_request){
sendRequestWithHttpURLConnection();
}
}
private void sendRequestWithHttpURLConnection(){
//开启线程
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL("http://www.baidu.com");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in = connection.getInputStream();
BufferedReader reader = new BufferedReader((new InputStreamReader(in)));
StringBuilder response = new StringBuilder();
String line ;
while ((line = reader.readLine())!= null){
response.append(line);
}
Message message = new Message() ;
message.what = SHOW_RESPONSE ;
message.obj = response.toString();
handler.sendMessage(message);
}catch (Exception e){
e.printStackTrace();
}finally {
if (connection!=null){
connection.disconnect();
}
}
}
}).start();
}
}
<uses-permission android:name="android.permission.INTERNET"/>post
public static String loginOfPost(String username, String password) {
HttpURLConnection conn = null;
try {
// 创建一个URL对象
URL mURL = new URL("http://192.168.0.100:8080/android/servlet/LoginServlet");
// 调用URL的openConnection()方法,获取HttpURLConnection对象
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("POST");// 设置请求方法为post
conn.setReadTimeout(5000);// 设置读取超时为5秒
conn.setConnectTimeout(10000);// 设置连接网络超时为10秒
conn.setDoOutput(true);// 设置此方法,允许向服务器输出内容
// post请求的参数
String data = "username=" + username + "&password=" + password;
// 获得一个输出流,向服务器写数据,默认情况下,系统不允许向服务器输出内容
OutputStream out = conn.getOutputStream();// 获得一个输出流,向服务器写数据
out.write(data.getBytes());
out.flush(); // 刷新对象输出流，将任何字节都写入潜在的流中
out.close();
int responseCode = conn.getResponseCode();// 调用此方法就不必再使用conn.connect()方法
if (responseCode == 200) {
InputStream is = conn.getInputStream();
String state = getStringFromInputStream(is);
return state;
} else {
Log.i(TAG, "访问失败" + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();// 关闭连接
}
}
return null;
}2 使用HttpClient （在Android 6.0（API 23） 中，Google已经移除了Apache HttpClient 想关类，推荐使用HttpUrlConnection，如果要继续使用，在Android studio对应的module下的build.gradle文件中加入：
android {
useLibrary ‘org.apache.http.legacy’
}）
package com.example.networktest;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static final int SHOW_RESPONSE = 0;
private Button sendRquest;
private TextView responseText;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_RESPONSE:
String response = (String) msg.obj;
//进行UI操作
responseText.setText(response);
}
}
};
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sendRquest = (Button) findViewById(R.id.send_request);
responseText = (TextView) findViewById(R.id.response_text);
sendRquest.setOnClickListener(this);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.send_request) {
// sendRequestWithHttpURLConnection();
sendRequestWithHttpClient();
}
}
private void sendRequestWithHttpURLConnection() {
//开启线程
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL("http://www.baidu.com");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in = connection.getInputStream();
BufferedReader reader = new BufferedReader((new InputStreamReader(in)));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
Message message = new Message();
message.what = SHOW_RESPONSE;
message.obj = response.toString();
handler.sendMessage(message);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
}).start();
}
private void sendRequestWithHttpClient() {
new Thread(new Runnable() {
@Override
public void run() {
try {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet("http://www.baidu.com");
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200){
HttpEntity entity =httpResponse.getEntity();
String response = EntityUtils.toString(entity,"utf-8");
Message message = new Message();
message.what = SHOW_RESPONSE ;
message.obj = response.toString();
handler.sendMessage(message);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.example.networktest/http/host/path")
);
AppIndex.AppIndexApi.start(client, viewAction);
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.example.networktest/http/host/path")
);
AppIndex.AppIndexApi.end(client, viewAction);
client.disconnect();
}
}
作者：So_discrepancy 发表于2016/10/5 9:37:35 原文链接
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