android 获取服务器json数据

package com.embest.JsonTest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.util.Log;

public class JSONProvider {

public static String getJSONData(String url)
throws ClientProtocolException, IOException{
String result="";
HttpGet httpGet=new HttpGet(url);
HttpClient httpClient=new DefaultHttpClient();
HttpResponse httpResponse=null;

try {
httpResponse=httpClient.execute(httpGet);
HttpEntity httpEntity=httpResponse.getEntity();
if (httpEntity!=null) {
InputStream inputStream=httpEntity.getContent();
result=convertStreamToString(inputStream);

}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (IOException e) {
throw e;
} finally {
httpClient.getConnectionManager().shutdown();
httpResponse = null;
}
return result;

}
public static String convertStreamToString(InputStream is) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(is,"GB2312"),//防止模拟器上的乱码
512 * 1024);
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
StringBuilder sb = new StringBuilder();

String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "/n");
}
} catch (IOException e) {
Log.e("DataProvier convertStreamToString", e.getLocalizedMessage(),
e);
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}

}

main.xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

fest.xml

加上这一句话

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

activity 文件

package com.embest.JsonTest;

import java.io.IOException;

import org.apache.http.client.ClientProtocolException;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class JsonActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView textView=(TextView)findViewById(R.id.json);
try {
String json=JSONProvider.getJSONData("http://192.168.2.68:80/webapp/getlistjson.asp");
textView.setText(json);

} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}

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