android通过http请求获得json内容详解编程语言

//JsonActivity.java 
package com.v3; 
 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.Reader; 
import java.net.URI; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.StringTokenizer; 
 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.params.CoreProtocolPNames; 
import org.json.JSONArray; 
import org.json.JSONObject; 
import org.json.JSONStringer; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Message; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
 
public class JsonActivity extends Activity { 
Button button,buttonClear; 
TextView textView; 
String page; 
String str=""; 
 
String url = "http://192.168.1.118/androidjsontest/index.php"; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
button = (Button) findViewById(R.id.btnFetch); 
buttonClear = (Button) findViewById(R.id.btnClear); 
textView = (TextView) findViewById(R.id.txtView); 
button.setOnClickListener(new Button.OnClickListener() 
{ 
public void onClick(View v) 
{ 
examineJSONFile(); 
} 
}); 
buttonClear.setOnClickListener(new Button.OnClickListener() 
{ 
public void onClick(View v) 
{ 
textView.setText(""); 
} 
}); 
 
} 
 
public String executeHttpGet(String URL) throws Exception 
{ 
//This method for HttpConnection 
BufferedReader bufferedReader = null; 
try 
{ 
HttpClient client = new DefaultHttpClient(); 
client.getParams().setParameter(CoreProtocolPNames.USER_AGENT, "android"); 
HttpGet request = new HttpGet(); 
request.setHeader("Content-Type", "text/plain; charset=utf-8"); 
request.setURI(new URI(URL)); 
HttpResponse response = client.execute(request); 
bufferedReader = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); 
 
StringBuffer stringBuffer = new StringBuffer(""); 
String line = ""; 
 
String NL = System.getProperty("line.separator"); 
while ((line = bufferedReader.readLine()) != null) 
{ 
stringBuffer.append(line + NL); 
System.out.print(stringBuffer); 
} 
bufferedReader.close(); 
page = stringBuffer.toString(); 
System.out.println(page+"page"); 
return page; 
} 
finally 
{ 
if (bufferedReader != null) 
{ 
try 
{ 
bufferedReader.close(); 
} 
catch (IOException e) 
{ 
Log.d("BBB", e.toString()); 
} 
} 
} 
} 
 
void examineJSONFile() 
{ 
try 
{ 
 
String Value="" ; 
String str = ""; 
page = executeHttpGet(url); 
Log.i("hello", str.toString()); 
 
JSONObject object=new JSONObject(page); 
str=str+object.names().toString(); 
 
String sub1=str.substring(2, str.length()-2); 
String[] names=sub1.split("/",/""); 
 
for (int i=0;i<names.length;i++) { 
Value=Value+names[i] +":"+object.get(names[i])+"/n"; 
System.out.println(names[i]); 
 
} 
 
/* String sub=str.substring(1, str.length()-1); 
  String[] names=sub.split(","); 
  String[] keyValue=new String[names.length]; 
 
  for (int i=0;i<names.length;i++) { 
  names[i]=names[i].replace("/"",""); 
  Value=Value+names[i] +":"+object.get(names[i])+"/n"; 
  //keyValue[i]=names[i] +":"+object.get(names[i])+"/n"; 
System.out.println(names[i]); 
 
}*/ 
 
textView.setText(Value); 
 
/*for(int i=0;i<keyValue.length;i++){ 
  textView.setText(keyValue[i]); 
  }*/ 
 
Log.i("hello", str.toString()); 
 
} 
catch (Exception je) 
{ 
textView.setText("Error w/file: " + je.getMessage()); 
} 
} 
 
}