編輯:關於Android編程
獲取數據用GET請求 ??
增刪改查修改數據用POST請求
package com.example.jreduch07; import android.os.AsyncTask; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; 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 { public 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 view) { String url="http://192.168.1.48:8080/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://192.168.1.48:8080/HttpTest/index.jsp"; arg[1]="option=getUser&uName=jerehedu"; new MyPostJob1().execute(arg); } }); } private class MyPostJob1 extends AsyncTask{ @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"); // con.setRequestProperty("Charset","UTF-8"); // con.setRequestProperty("Content-type","application/x-www-from-urlencoded"); //params應該是這樣的=》option=getUser&uName=jerehedu String params=strings[1]; OutputStream os=con.getOutputStream(); //數據傳輸 流 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(); //斷開連接 } } } return sbd.toString(); } @Override protected void onPostExecute(String s) { super.onPostExecute(s); show.setText("POST請求結果:"+s); } } /* AsyncTask異步任務類 異步任務類的第一個參數會傳到doInBackground方法中 第三個參數 #指定doINBackground方法的返回值 #doINBackground方法的返回值會被OnPostExecute接收 */ private class MyGetJob extends AsyncTask { //onPreExecute在主線程中執行命令 //進度條的初始化 @Override protected void onPreExecute() { super.onPreExecute(); } //doInBackground在子線程中執行名命令 @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); /* *http相應200:成功 * 404未找到 * 500發生錯誤 */ 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 { if (is != null) { try { is.close(); } catch (IOException e) { e.printStackTrace(); } if (con != null) { con.disconnect(); //斷開連接 } } } return sbd.toString(); } //onPostExecute在UI線程中執行命令 主線程 @Override protected void onPostExecute(String s) { super.onPostExecute(s); show.setText(s); } } }
異步加載之使用多線程初次嘗試異步、異步,其實說白了就是多任務處理,也就是多線程執行,多線程那就會有各種問題,我們一步步來看,首先,我們創建一個class—&m
本章內容第1節 線性布局第2節 相對布局第3節 幀布局第4節 表格布局第5節 網格布局 線性布局線性布局使用標簽進行配置,對應代碼中的類是android.wid
前邊4篇文章,成功將 u-boot2012 移植到了 2440 開發板上,但是它僅僅支持 norflash 啟動並不夠完善,下面我們設法讓它支持兩種啟動方式。首先,我們得
本教程為大家分享了Android日歷庫的使用方法,供大家參考,具體內容如下MainActivity.java代碼:package siso.weekv;import an