android通用JSON解析

ackage cn.com.pcgroup.<a href="http://lib.csdn.net/base/15" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">android</a>.browser.module.onlineproduct;

import <a href="http://lib.csdn.net/base/17" class="replace_word" title="Java EE知识库" target="_blank" style="color:#df3434; font-weight:bold;">java</a>.io.IOException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.nio.ByteBuffer;

import java.nio.channels.Channels;

import java.nio.channels.ReadableByteChannel;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

import org.json.JSONArray;

import org.json.JSONObject;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import cn.com.pcgroup.android.browser.R;

public class Information extends Activity {

private static final String baseUrl = "http://192.168.199.45/1.txt";

private static final String TAG = Information.class.getSimpleName();

private static LayoutInflater mInflater;

private static String json;

private Map<String, String> infoMap = new HashMap<String, String>();

private static Map<Index, String> itemMap = new HashMap<Index, String>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.online_product_information);

ListView list = (ListView) findViewById(R.id.list);

mInflater = getWindow().getLayoutInflater();

try {

json = downloadJSON().get();

Log.v(TAG, json);

JSONObject jsonObject = new JSONObject(json);

handleJson(jsonObject, infoMap);

Index i = new Index();

i.setKey("image");

i.setPos(1);

String result = itemMap.get(i);

Log.v(TAG, "result = " + result);

Log.v(TAG, "productId = " + infoMap.get("productId"));

Log.v(TAG, "itemCount = " + itemCount);

InforAdapter adapter = new InforAdapter(itemCount);

list.setAdapter(adapter);

} catch (Exception e) {

throw new RuntimeException(e);

}

}

private void handleJson(JSONObject jsonObject, Map<String, String> infoMap) {

if (jsonObject == null || infoMap == null)

return;

@SuppressWarnings("unchecked")

Iterator<String> it = jsonObject.keys();

while (it.hasNext()) {

String key = it.next();

JSONArray array = jsonObject.optJSONArray(key);

// 假如只是JSONObject

if (array == null)

infoMap.put(key, jsonObject.optString(key));

// 是JSONArray，则递归处理

else {

handleJsonArray(array, itemMap);

}

}

}

private static class Index {

private int pos = 0;

private String key = new String();

public Index() {

}

public Index(int pos, String key) {

this.pos = pos;

this.key = key;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((key == null) ? 0 : key.hashCode());

result = prime * result + pos;

return result;

}

@Override

public boolean equals(Object obj) {

if (obj == this)

return true;

if (obj instanceof Index)

return ((Index) obj).pos == pos

&& (((Index) obj).key).equals(key);

return false;

}

public int getPos() {

return pos;

}

public void setPos(int pos) {

this.pos = pos;

}

public String getKey() {

return key;

}

public void setKey(String key) {

this.key = key;

}

}

private int itemCount = 0;

private int handleJsonArray(JSONArray array, Map<Index, String> map) {

if (array == null)

return itemCount;

int len = array.length();

itemCount = len;

for (int i = 0; i < len; i++) {

JSONObject obj = (JSONObject) array.opt(i);

@SuppressWarnings("unchecked")

Iterator<String> it = obj.keys();

while (it.hasNext()) {

String key = it.next();

JSONArray a = obj.optJSONArray(key);

if (a != null)

handleJsonArray(a, itemMap);

else {

Index index = new Index(i, key);

itemMap.put(index, obj.optString(key));

}

}

}

return itemCount;

}

private static class InforAdapter extends BaseAdapter {

private int count; // 有几条数据

String[] sa = { "id", "title", "image", "channel" };

public InforAdapter(int count) {

this.count = count;

}

@Override

public int getCount() {

return count;

}

@Override

public Object getItem(int position) {

return position;

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

if (convertView == null) {

convertView = mInflater.inflate(R.layout.information_layout,

null);

}

TextView t = (TextView) convertView.findViewById(R.id.text);

t.setTextSize(20);

Index i = new Index(position, "title");

t.setText(itemMap.get(i));

return convertView;

}

}

@SuppressWarnings({ "finally", "unused" })

private String getStringFromServer(final String url){

ReadableByteChannel channel = null;

StringBuilder sb = null;

try {

URL u = new URL(url);

HttpURLConnection conn = (HttpURLConnection) u.openConnection();

channel = Channels.newChannel(conn.getInputStream());

ByteBuffer buffer = ByteBuffer.allocate(1024);

sb = new StringBuilder();

while(channel.read(buffer) != -1){

buffer.flip();

while(buffer.hasRemaining())

sb.append((char)buffer.get());

buffer.clear();

}

} catch (Exception e) {

throw new RuntimeException(e);

}finally{

try {

channel.close();

} catch (IOException e) {

e.printStackTrace();

}finally{

return sb.toString();

}

}

}

private Future<String> downloadJSON(){

ExecutorService exec = Executors.newCachedThreadPool();

class DownLoadTask implements Callable<String>{

@SuppressWarnings("static-access")

@Override

public String call() {

json = OnlineApiService.getInstance(Information.this).getJSONString(baseUrl);

return json;

}

}

Future<String> future = exec.submit(new DownLoadTask());

exec.shutdown();

return future;

}

}