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
Java-web: servlet服务端;
<?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>
activity_main.xml
<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>
listview_item.xml
<?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; } } }
时间: 2024-12-26 08:38:56