【黑马Android】(06)使用HttpClient方式请求网络/网易新闻案例

使用HttpClient方式请求网络

<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"
tools:context=".MainActivity" >

<EditText
android:id="@+id/et_username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入姓名" />

<EditText
android:id="@+id/et_password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入密码" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="doGet"
android:text="Get方式提交" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="doPost"
android:text="Post方式提交" />
</LinearLayout>

package com.itheim28.submitdata.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.util.Log;

public class NetUtils2 {

private static final String TAG = "NetUtils";

/**
* 使用post的方式登录
* @param userName
* @param password
* @return
*/
public static String loginOfPost(String userName, String password) {
HttpClient client = null;
try {
// 定义一个客户端
client = new DefaultHttpClient();

// 定义post方法
HttpPost post = new HttpPost("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet");

// 定义post请求的参数
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("username", userName));
parameters.add(new BasicNameValuePair("password", password));

// 把post请求的参数包装了一层.

// 不写编码名称服务器收数据时乱码. 需要指定字符集为utf-8
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");
// 设置参数.
post.setEntity(entity);

// 设置请求头消息
//			post.addHeader("Content-Length", "20");

// 使用客户端执行post方法
HttpResponse response = client.execute(post);	// 开始执行post请求, 会返回给我们一个HttpResponse对象

// 使用响应对象, 获得状态码, 处理内容
int statusCode = response.getStatusLine().getStatusCode();	// 获得状态码
if(statusCode == 200) {
// 使用响应对象获得实体, 获得输入流
InputStream is = response.getEntity().getContent();
String text = getStringFromInputStream(is);
return text;
} else {
Log.i(TAG, "请求失败: " + statusCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(client != null) {
client.getConnectionManager().shutdown();	// 关闭连接和释放资源
}
}
return null;
}

/**
* 使用get的方式登录
* @param userName
* @param password
* @return 登录的状态
*/
public static String loginOfGet(String userName, String password) {
HttpClient client = null;
try {
// 定义一个客户端
client = new DefaultHttpClient();

// 定义一个get请求方法
String data = "username=" + userName + "&password=" + password;
HttpGet get = new HttpGet("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet?" + data);

// response 服务器相应对象, 其中包含了状态信息和服务器返回的数据
HttpResponse response = client.execute(get);	// 开始执行get方法, 请求网络

// 获得响应码
int statusCode = response.getStatusLine().getStatusCode();

if(statusCode == 200) {
InputStream is = response.getEntity().getContent();
String text = getStringFromInputStream(is);
return text;
} else {
Log.i(TAG, "请求失败: " + statusCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(client != null) {
client.getConnectionManager().shutdown();	// 关闭连接, 和释放资源
}
}
return null;
}

/**
* 根据流返回一个字符串信息
* @param is
* @return
* @throws IOException
*/
private static String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;

while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();

String html = baos.toString();	// 把流中的数据转换成字符串, 采用的编码是: utf-8

//		String html = new String(baos.toByteArray(), "GBK");

baos.close();
return html;
}
}

package com.itheim28.submitdata;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.itheim28.submitdata.utils.NetUtils;
import com.itheim28.submitdata.utils.NetUtils2;

public class MainActivity extends Activity {

private static final String TAG = "MainActivity";
private EditText etUserName;
private EditText etPassword;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

etUserName = (EditText) findViewById(R.id.et_username);
etPassword = (EditText) findViewById(R.id.et_password);
}

/**
* 使用httpClient方式提交get请求
* @param v
*/
public void doHttpClientOfGet(View v) {
Log.i(TAG, "doHttpClientOfGet");
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();

new Thread(new Runnable() {

@Override
public void run() {
// 请求网络
final String state = NetUtils2.loginOfGet(userName, password);
// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}}).start();
}

/**
* 使用httpClient方式提交post请求
* @param v
*/
public void doHttpClientOfPost(View v) {
Log.i(TAG, "doHttpClientOfPost");
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();

new Thread(new Runnable() {
@Override
public void run() {
final String state = NetUtils2.loginOfPost(userName, password);
// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}

public void doGet(View v) {
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();

new Thread(
new Runnable() {

@Override
public void run() {
// 使用get方式抓去数据
final String state = NetUtils.loginOfGet(userName, password);

// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}

public void doPost(View v) {
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();

new Thread(new Runnable() {
@Override
public void run() {
final String state = NetUtils.loginOfPost(userName, password);
// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}
}

网易新闻案例-1

<?xml version="1.0" encoding="UTF-8" ?>
<news>
<new>
<title>3Q大战宣判: 腾讯获赔500万</title>
<detail>最高法驳回360上诉, 维持一审宣判.</detail>
<comment>6427</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image>
</new>
<new>
<title>今日之声:北大雕塑被戴口罩</title>
<detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail>
<comment>681</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image>
</new>
<new>
<title>奥巴马见达赖是装蒜</title>
<detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail>
<comment>1359</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image>
</new>
<new>
<title>轻松一刻: 我要沉迷学习不自拔</title>
<detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail>
<comment>10116</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image>
</new>
<new>
<title>男女那些事儿</title>
<detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail>
<comment>10339</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image>
</new>
<new>
<title>3Q大战宣判: 腾讯获赔500万</title>
<detail>最高法驳回360上诉, 维持一审宣判.</detail>
<comment>6427</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image>
</new>
<new>
<title>今日之声:北大雕塑被戴口罩</title>
<detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail>
<comment>681</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image>
</new>
<new>
<title>奥巴马见达赖是装蒜</title>
<detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail>
<comment>1359</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image>
</new>
<new>
<title>轻松一刻: 我要沉迷学习不自拔</title>
<detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail>
<comment>10116</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image>
</new>
<new>
<title>男女那些事儿</title>
<detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail>
<comment>10339</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image>
</new>
<new>
<title>3Q大战宣判: 腾讯获赔500万</title>
<detail>最高法驳回360上诉, 维持一审宣判.</detail>
<comment>6427</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image>
</new>
<new>
<title>今日之声:北大雕塑被戴口罩</title>
<detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail>
<comment>681</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image>
</new>
<new>
<title>奥巴马见达赖是装蒜</title>
<detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail>
<comment>1359</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image>
</new>
<new>
<title>轻松一刻: 我要沉迷学习不自拔</title>
<detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail>
<comment>10116</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image>
</new>
<new>
<title>男女那些事儿</title>
<detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail>
<comment>10339</comment>
<image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image>
</new>
</news>

网易新闻案例-2

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.neteasedemo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.neteasedemo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

<RelativeLayout 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"
tools:context=".MainActivity" >

<ListView
android:id="@+id/lv_news"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dip" >

<com.loopj.android.image.SmartImageView
android:id="@+id/siv_listview_item_icon"
android:layout_width="100dip"
android:layout_height="60dip"
android:src="@drawable/a" />

<TextView
android:id="@+id/tv_listview_item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="3dip"
android:layout_toRightOf="@id/siv_listview_item_icon"
android:singleLine="true"
android:text="3Q大战宣判: 腾讯获赔500万"
android:textColor="@android:color/black"
android:textSize="17sp" />

<TextView
android:id="@+id/tv_listview_item_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/tv_listview_item_title"
android:layout_below="@id/tv_listview_item_title"
android:layout_marginTop="3dip"
android:text="啊发送旅客登机挥发速度发送旅客登机"
android:textColor="@android:color/darker_gray"
android:textSize="14sp" />

<TextView
android:id="@+id/tv_listview_item_comment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="668跟帖"
android:textColor="#FF0000"
android:textSize="12sp" />

</RelativeLayout>

package com.itheima28.neteasedemo.domain;

/**
* @author andong
* 新闻信息实体类
*/
public class NewInfo {

private String title; // 标题
private String detail; // 详细
private Integer comment; // 跟帖数量
private String imageUrl; // 图片连接
@Override
public String toString() {
return "NewInfo [title=" + title + ", detail=" + detail + ", comment="
+ comment + ", imageUrl=" + imageUrl + "]";
}
public NewInfo(String title, String detail, Integer comment, String imageUrl) {
super();
this.title = title;
this.detail = detail;
this.comment = comment;
this.imageUrl = imageUrl;
}
public NewInfo() {
super();
// TODO Auto-generated constructor stub
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public Integer getComment() {
return comment;
}
public void setComment(Integer comment) {
this.comment = comment;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
}

package com.itheima28.neteasedemo;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.xmlpull.v1.XmlPullParser;

import com.itheima28.neteasedemo.domain.NewInfo;
import com.loopj.android.image.SmartImageView;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.util.Log;
import android.util.Xml;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private static final String TAG = "MainActivity";
private final int SUCCESS = 0;
private final int FAILED = 1;
private ListView lvNews;
private List<NewInfo> newInfoList;

private Handler handler = new Handler() {

/**
* 接收消息
*/
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SUCCESS:		// 访问成功, 有数据
// 给Listview列表绑定数据

newInfoList = (List<NewInfo>) msg.obj;

MyAdapter adapter = new MyAdapter();
lvNews.setAdapter(adapter);
break;
case FAILED:	// 无数据
Toast.makeText(MainActivity.this, "当前网络崩溃了.", 0).show();
break;
default:
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

init();
}

private void init() {
lvNews = (ListView) findViewById(R.id.lv_news);

// 抓取新闻数据
new Thread(new Runnable() {
@Override
public void run() {
// 获得新闻集合
List<NewInfo> newInfoList = getNewsFromInternet();
Message msg = new Message();
if(newInfoList != null) {
msg.what = SUCCESS;
msg.obj = newInfoList;
} else {
msg.what = FAILED;
}
handler.sendMessage(msg);
}
}).start();

}

/**
* 返回新闻信息
*/
private List<NewInfo> getNewsFromInternet() {
HttpClient client = null;
try {
// 定义一个客户端
client = new DefaultHttpClient();

// 定义get方法
HttpGet get = new HttpGet("http://192.168.1.254:8080/NetEaseServer/new.xml");

// 执行请求
HttpResponse response = client.execute(get);

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

if(statusCode == 200) {
InputStream is = response.getEntity().getContent();
List<NewInfo> newInfoList = getNewListFromInputStream(is);
return newInfoList;
} else {
Log.i(TAG, "访问失败: " + statusCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(client != null) {
client.getConnectionManager().shutdown();		// 关闭和释放资源
}
}
return null;
}

/**
* 从流中解析新闻集合
* @param is
* @return
*/
private List<NewInfo> getNewListFromInputStream(InputStream is) throws Exception {
XmlPullParser parser = Xml.newPullParser();	// 创建一个pull解析器
parser.setInput(is, "utf-8");	// 指定解析流, 和编码

int eventType = parser.getEventType();

List<NewInfo> newInfoList = null;
NewInfo newInfo = null;
while(eventType != XmlPullParser.END_DOCUMENT) {	// 如果没有到结尾处, 继续循环

String tagName = parser.getName();	// 节点名称
switch (eventType) {
case XmlPullParser.START_TAG: // <news>
if("news".equals(tagName)) {
newInfoList = new ArrayList<NewInfo>();
} else if("new".equals(tagName)) {
newInfo = new NewInfo();
} else if("title".equals(tagName)) {
newInfo.setTitle(parser.nextText());
} else if("detail".equals(tagName)) {
newInfo.setDetail(parser.nextText());
} else if("comment".equals(tagName)) {
newInfo.setComment(Integer.valueOf(parser.nextText()));
} else if("image".equals(tagName)) {
newInfo.setImageUrl(parser.nextText());
}
break;
case XmlPullParser.END_TAG:	// </news>
if("new".equals(tagName)) {
newInfoList.add(newInfo);
}
break;
default:
break;
}
eventType = parser.next();		// 取下一个事件类型
}
return newInfoList;
}

class MyAdapter extends BaseAdapter {

/**
* 返回列表的总长度
*/
@Override
public int getCount() {
return newInfoList.size();
}

/**
* 返回一个列表的子条目的布局
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;

if(convertView == null) {
LayoutInflater inflater = getLayoutInflater();
view = inflater.inflate(R.layout.listview_item, null);
} else {
view = convertView;
}

// 重新赋值, 不会产生缓存对象中原有数据保留的现象
SmartImageView sivIcon = (SmartImageView) view.findViewById(R.id.siv_listview_item_icon);
TextView tvTitle = (TextView) view.findViewById(R.id.tv_listview_item_title);
TextView tvDetail = (TextView) view.findViewById(R.id.tv_listview_item_detail);
TextView tvComment = (TextView) view.findViewById(R.id.tv_listview_item_comment);

NewInfo newInfo = newInfoList.get(position);

sivIcon.setImageUrl(newInfo.getImageUrl());		// 设置图片
tvTitle.setText(newInfo.getTitle());
tvDetail.setText(newInfo.getDetail());
tvComment.setText(newInfo.getComment() + "跟帖");
return view;
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
}
}