【发布时间】:2011-06-10 02:37:33
【问题描述】:
我一直在尝试各种网站上显示的关于将 MySQL 数据库连接到 android 的教程。目前,下面的代码采用您硬编码的值(即 year=2005 和 name=tom)并通过 php 脚本运行它。我想知道的是如何修改它,以便它采用用户在文本框中输入的值。
package com.test;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
import android.widget.TextView;
public class test extends Activity {
/** Called when the activity is first created. */
TextView txt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Create a crude view - this should really be set via the layout resources
// but since its an example saves declaring them in the XML.
LinearLayout rootLayout = new LinearLayout(getApplicationContext());
txt = new TextView(getApplicationContext());
rootLayout.addView(txt);
setContentView(rootLayout);
// Set the text and call the connect function.
txt.setText("Connecting...");
//call the method to run the data retrieval
txt.setText(getServerData(KEY_121));
}
public static final String KEY_121 = "http://***.****.com/mysqlcon.php"; //i use my real ip here
private String getServerData(String returnString) {
InputStream is = null;
String result = "";
//the year data to send
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("year","2005"));
nameValuePairs.add(new BasicNameValuePair("name","tom"));
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(KEY_121);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
//parse json data
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getInt("id")+
", name: "+json_data.getString("name")+
", sex: "+json_data.getInt("sex")+
", birthyear: "+json_data.getInt("birthyear")
);
//Get an output to the screen
returnString += "\n\t" + jArray.getJSONObject(i);
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return returnString;
}
}
【问题讨论】:
-
您可能希望将其标记为 java 而不是 php
-
您不应该允许客户端安卓应用程序访问一般的 mysql 数据库。可以很容易地从应用程序中获取凭据并直接访问数据库,从而允许用户对数据库执行任何操作。相反,您应该创建一个公共 API,以支持使您的应用程序正常运行所需的一组固定操作。
-
@poke - 我知道这不是最好的方法,但我刚刚开始学习 java 语言,所以从网络上提供的基本教程开始。
-
如果你想学习Java,那就做一些java教程(即不是Android);如果您想学习 Android 开发,请做一些实际上与 Android 应用程序开发相关的教程。连接到远程 MySQL 数据库不是一项常见的任务,因此对您没有多大帮助..