android 网络

Android  /  houtizong 发布于 3年前   113

android的网络编程和java的一样没什么好分析的都是一些死的照着写就可以了,所以记录下来  方便查找   ,  服务器使用的是TomCat

 

服务器代码;  servlet的使用需要在xml中注册

package servlet;import java.io.IOException;import java.util.ArrayList;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import pojo.Music;/** * Servlet implementation class MusicServlet */public class MusicServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void service(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 获得客户端提交的参数,获取客户端的参数String flag = request.getParameter("flag");//将字符串的字符集由Iso8859-1 转为 UTF-8//flag = new String(flag.getBytes("ISO8859-1"),"UTF-8");System.out.println("请求的:"+flag);// 链接数据库，查询数据ArrayList<Music> list = new ArrayList<Music>();for (int i = 0; i < 10; i++) {Music m = new Music();m.setName("歌曲" + i);m.setGeshou("歌手" + i);m.setSize("5:2" + i);m.setZhuanji("专辑" + i);list.add(m);}                  //将数据放在队列中request.setAttribute("list", list);if (flag.equals("xml")) {request.getRequestDispatcher("xml.jsp").forward(request, response);}else{request.getRequestDispatcher("json.jsp").forward(request, response);}}}

java bean 

package pojo;public class Music {private String name;private String geshou;private String size;private String zhuanji;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getGeshou() {return geshou;}public void setGeshou(String geshou) {this.geshou = geshou;}public String getSize() {return size;}public void setSize(String size) {this.size = size;}public String getZhuanji() {return zhuanji;}public void setZhuanji(String zhuanji) {this.zhuanji = zhuanji;}}

 

xml格式显示

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ page import="java.util.*,pojo.*"%><%//取数据    ArrayList<Music> list = (ArrayList<Music>)request.getAttribute("list");    if(list!=null){//如果list存在，就将队列中的数据包装成xml格式的数据输出%><?xml version='1.0' encoding='UTF-8'?><musiclist> <% for(int i=0;i<list.size();i++){ Music m = list.get(i); %>  <music> <name><%=m.getName() %></name> <geshou><%=m.getGeshou() %></geshou> <zhuanji><%=m.getZhuanji() %></zhuanji> <size><%=m.getSize() %></size> </music> <% } %> </musiclist>  <% } %>

 

json格式显示

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ page import="java.util.*,pojo.*"%><%//取数据    ArrayList<Music> list = (ArrayList<Music>)request.getAttribute("list");    if(list!=null){//如果list存在，就将队列中的数据包装成xml格式的数据输出%><?xml version='1.0' encoding='UTF-8'?><musiclist> <% for(int i=0;i<list.size();i++){ Music m = list.get(i); %>  <music> <name><%=m.getName() %></name> <geshou><%=m.getGeshou() %></geshou> <zhuanji><%=m.getZhuanji() %></zhuanji> <size><%=m.getSize() %></size> </music> <% } %> </musiclist>  <% } %>

 

 

 

android格式端 访问服务器

 

1,访问图片  输入图片的地址  点击按钮获取图片

public class SecondActivity extends Activity {private EditText pathView;private ImageView imgView;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_second);pathView = (EditText) this.findViewById(R.id.pathView);imgView = (ImageView) this.findViewById(R.id.imgView);handler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 100:Bitmap bmp = (Bitmap) msg.obj;imgView.setImageBitmap(bmp);break;default:break;}}};}public void connServer(View v) {// 获取地址.地址必须是http开头的String path = pathView.getText().toString().trim();if (!path.startsWith("http://")) {path = "http://" + path;}new MyThread(path).start();}class MyThread extends Thread {String path;public MyThread(String path) {this.path = path;}public void run() {try {// 要请求的Uri地址URL url = new URL(path);// 通过URL建立一个连接HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 设置请求方式conn.setRequestMethod("GET");// 设置超时时间conn.setConnectTimeout(5000);// 获得输入流InputStream ips = conn.getInputStream();// 定义一个字节数组输出流ByteArrayOutputStream bos = new ByteArrayOutputStream();// 读取一个字节int t = ips.read();while (t != -1) {// 将读取到的直接写到字节数组输出流bos.write(t);// 读取下一个字节t = ips.read();}// 将字节数组输出流中的字节写入数组byte[] bs = bos.toByteArray();// 通过字节数组创建一个图片对象Bitmap bmp = BitmapFactory.decodeByteArray(bs, 0, bs.length);Message msg = handler.obtainMessage(100);msg.obj = bmp;handler.sendMessage(msg);} catch (Exception e) {e.printStackTrace();}}};}

 

 

 

2,基于http的post和get请求

public class ClientActivity extends Activity {private EditText pathView;private TextView imgView;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_xml);pathView = (EditText) this.findViewById(R.id.pathView);imgView = (TextView) this.findViewById(R.id.imgView);handler = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case 100:String str = (String) msg.obj;imgView.setText(str);break;}}};}public void connServer(View v) {// 要请求的地址String path = pathView.getText().toString().trim();if (!path.startsWith("http://")) {path = "http://" + path;}new MyThreadPost(path).start();}// 基于HttpClient发送Get请求class MyThread extends Thread {String path;public MyThread(String path) {this.path = path;}public void run() {try {// 定义客户端对象HttpClient client = new DefaultHttpClient();// 定义要发送的请求对象HttpGet get = new HttpGet(path);// 发送请求，返回响应对象HttpResponse response = client.execute(get);// 如果响应成功if (response.getStatusLine().getStatusCode() == 200) {// 获得返回的数据HttpEntity entity = response.getEntity();String str = EntityUtils.toString(entity);Message msg = handler.obtainMessage(100);msg.obj = str;handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}}// 基于HttpClient发送Post请求class MyThreadPost extends Thread {String path;public MyThreadPost(String path) {this.path = path;}public void run() {try {// 定义客户端对象HttpClient client = new DefaultHttpClient();// 包装Post请求对象HttpPost post = new HttpPost(path);// 数据源ArrayList<NameValuePair> nvpList = new ArrayList<NameValuePair>();NameValuePair nvp = new BasicNameValuePair("flag", "xml");nvpList.add(nvp);// 定义要提交的数据实体UrlEncodedFormEntity entity = new UrlEncodedFormEntity(nvpList);// 设置要提交的数据post.setEntity(entity);// 发送请求HttpResponse response = client.execute(post);if (response.getStatusLine().getStatusCode() == 200) {// 获得返回的数据HttpEntity entity2 = response.getEntity();String str = EntityUtils.toString(entity2);Message msg = handler.obtainMessage(100);msg.obj = str;handler.sendMessage(msg);}} catch (Exception ef) {ef.printStackTrace();}}}}

 

 

3,HttpURLConnection 的post请求

public class PostActivity extends Activity {private EditText pathView;private TextView imgView;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_xml);pathView = (EditText) this.findViewById(R.id.pathView);imgView = (TextView) this.findViewById(R.id.imgView);handler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 100:byte[] bs = (byte[]) msg.obj;String str = new String(bs);imgView.setText(str);break;default:break;}}};}public void connServer(View v) {// 获取地址.地址必须是http开头的String path = pathView.getText().toString().trim();if (!path.startsWith("http://")) {path = "http://" + path;}new MyThread(path).start();}class MyThread extends Thread {String path;public MyThread(String path) {this.path = path;}public void run() {try {// 要请求的Uri地址URL url = new URL(path);// 通过URL建立一个连接HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 设置请求方式为Postconn.setRequestMethod("POST");// 设置超时时间conn.setConnectTimeout(5000);//设置允许输出数据conn.setDoOutput(true);//准备要发送的数据String data = "flag=张三";//定义Post方式的数据标头      conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");conn.setRequestProperty("Content-Length", ""+data.getBytes().length);//获得输出流，写出数据OutputStream ops = conn.getOutputStream();ops.write(data.getBytes());ops.flush();ops.close();System.out.println("conn.getResponseCode()"+conn.getResponseCode());if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {// 获得输入流InputStream ips = conn.getInputStream();// 定义一个字节数组输出流ByteArrayOutputStream bos = new ByteArrayOutputStream();// 读取一个字节int t = ips.read();while (t != -1) {// 将读取到的直接写到字节数组输出流bos.write(t);// 读取下一个字节t = ips.read();}// 将字节数组输出流中的字节写入数组byte[] bs = bos.toByteArray();Message msg = handler.obtainMessage(100);msg.obj = bs;handler.sendMessage(msg);} else {Message msg = handler.obtainMessage(100);msg.obj = "响应失败！".getBytes();handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}};}

 

4,HttpURLConnection 的get请求

public class XMLActivity extends Activity {private EditText pathView;private TextView imgView;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_xml);pathView = (EditText) this.findViewById(R.id.pathView);imgView = (TextView) this.findViewById(R.id.imgView);handler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 100:byte[] bs = (byte[]) msg.obj;String str = new String(bs);imgView.setText(str);break;default:break;}}};}public void connServer(View v) {// 获取地址.地址必须是http开头的String path = pathView.getText().toString().trim();if (!path.startsWith("http://")) {path = "http://" + path;}new MyThread(path).start();}class MyThread extends Thread {String path;public MyThread(String path) {this.path = path;}public void run() {try {//获得参数String arg  = path.substring(path.lastIndexOf("=")+1);//对参数的值进行编码arg = URLEncoder.encode(arg, "UTF-8");//先截取掉原来的参数值，在加上编码后的参数值path= path.substring(0,path.lastIndexOf("=")+1)+arg;System.out.println(">>>>>>>>>"+path);// 要请求的Uri地址URL url = new URL(path);// 通过URL建立一个连接HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 设置请求方式conn.setRequestMethod("GET");// 设置超时时间conn.setConnectTimeout(5000);if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {// 获得输入流InputStream ips = conn.getInputStream();// 定义一个字节数组输出流ByteArrayOutputStream bos = new ByteArrayOutputStream();// 读取一个字节int t = ips.read();while (t != -1) {// 将读取到的直接写到字节数组输出流bos.write(t);// 读取下一个字节t = ips.read();}// 将字节数组输出流中的字节写入数组byte[] bs = bos.toByteArray();Message msg = handler.obtainMessage(100);msg.obj = bs;handler.sendMessage(msg);} else {Message msg = handler.obtainMessage(100);msg.obj = "响应失败！！";handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}};}

 

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