网络基础框架

来源：互联网发布：书生阅读器windows版编辑：程序博客网时间：2024/06/10 16:28
1、学习了Android网络基本框架，了解了UI的get和post用法的区别
2、AsyncTask异步任务类，必须通过此类来实现
3、使用这两种用法获取内容
以下程序为get和post方法的具体使用：
package com.example.administrator.jreduch07;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class HttpActivity extends AppCompatActivity {    private EditText et;    private Button search;    private Button search1;    private TextView show;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_http);        et=(EditText)findViewById(R.id.et);        search=(Button)findViewById(R.id.search);        search1=(Button)findViewById(R.id.search1);        show=(TextView)findViewById(R.id.show);        search.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String url="http://192.168.23.1:8080/HttpTest/index.jsp?"                        +"option=getUser&uName=jerehedu";               new  MyGetJob().execute(url);            }        });        search1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String[] arg=new String[2];               arg[0]="http://192.168.23.1:8080/HttpTest/index.jsp";               arg[1]="option=getUser&uName=jerehedu";                new MyPostJob().execute(arg);            }        });    }    public class MyPostJob extends AsyncTask<String,Void,String>{        @Override        protected String doInBackground(String... strings) {            HttpURLConnection con = null;            InputStream is = null;            StringBuilder sbd = new StringBuilder();            try {                URL url = new URL(strings[0]);                con = (HttpURLConnection) url.openConnection();                con.setConnectTimeout(5*1000);                con.setReadTimeout(5*1000);                con.setRequestMethod("POST");                con.setDoInput(true);                con.setDoOutput(true);                con.setUseCaches(false);                con.setRequestProperty("Charset","UTF-8");                con.setRequestProperty("Content-type","application/x-www-form-urlencoded");                //params应该是这样的样式 => option=getUser&uName=jerehedu                String params = strings[1];                OutputStream os = con.getOutputStream();                os.write(params.getBytes());                os.flush();                os.close();                if(con.getResponseCode()==200){                    is = con.getInputStream();                    int next = 0 ;                    byte[] b = new byte[1024];                    while ((next = is.read(b))>0){                        sbd.append(new String(b,0,next));                    }                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }finally {                if(is!=null){                    try {                        is.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }                if(con!=null){                    con.disconnect();                }            }            return sbd.toString();        }        @Override        protected void onPostExecute(String s) {            super.onPostExecute(s);            show.setText("POST请求结果:"+s);        }    }    /*    * AsyncTask异步任务类（耗时的操作）有五个方法（主线程3个方法，子线程2个方法）    * 异步任务类的第一个参数会传到doInBackgroung方法中    * 第三个参数是    *              #指定doInBackgroung的返回值    *              #doInBackgroung的返回值会被onPostExecute接收    * */    public class MyGetJob extends AsyncTask<String,Void,String >{        //onPreExecute在主线程中执行命令，进度条的初始化        @Override        protected void onPreExecute() {            super.onPreExecute();        }        // doInBackground在子线程中执行命令        @Override        protected String doInBackground(String... strings) {            HttpURLConnection con=null;//访问网络            InputStream is=null;            StringBuilder sbd=new StringBuilder();            try {                URL url=new URL(strings[0]);                con= (HttpURLConnection) url.openConnection();                con.setConnectTimeout(5*1000);                con.setReadTimeout(5*1000);                /*http 响应吗                 * 200：成功                 * 404：未找到                 * 500：发生错误                 */                if(con.getResponseCode()==200){                   is=con.getInputStream();                    int next=0;                    byte[] bt=new byte[1024];                    while((next=is.read(bt))>0){                        sbd.append(new String(bt,0,next));                    }                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }finally {                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }                if(con!=null){                    con.disconnect();                }            }            return sbd.toString();        }        // onPostExecute在UI线程中执行命令        @Override        protected void onPostExecute(String s) {            super.onPostExecute(s);            show.setText(s);        }    }}
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