(转)android客户端从服务器端获取json数据并解析的实现代码

2022-09-06 23:02:38

今天总结一下android客户端从服务器端获取json数据的实现代码，需要的朋友可以参考下

首先客户端从服务器端获取json数据

1、利用HttpUrlConnection

复制代码代码如下:

/**
* 从指定的URL中获取数组
*
@param urlPath
* @return
* @throws Exception

*/
public static String readParse(String urlPath) throws Exception {

ByteArrayOutputStream outStream = new
ByteArrayOutputStream();
byte[] data = new byte[1024];

int len = 0;
URL url = new
URL(urlPath);
HttpURLConnection conn = (HttpURLConnection)
url.openConnection();
InputStream inStream =
conn.getInputStream();
while ((len = inStream.read(data))
!= -1) {
outStream.write(data, 0, len);

}
inStream.close();

return new
String(outStream.toByteArray());//通过out.Stream.toByteArray获取到写的数据

}

2、利用HttpClient

复制代码
代码如下:

/**
* 访问数据库并返回JSON数据字符串
*

* @param params 向服务器端传的参数
* @param url
*
@return
* @throws Exception
*/
public static String
doPost(List<NameValuePair> params, String url)
throws
Exception {
String result = null;
//
获取HttpClient对象
HttpClient httpClient = new
DefaultHttpClient();
// 新建HttpPost对象
HttpPost httpPost =
new HttpPost(url);
if (params != null) {
//
设置字符集
HttpEntity entity = new UrlEncodedFormEntity(params,
HTTP.UTF_8);
// 设置参数实体

httpPost.setEntity(entity);
}

/*// 连接超时

httpClient.getParams().setParameter(

CoreConnectionPNames.CONNECTION_TIMEOUT, 3000);
// 请求超时

httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,

3000);*/
// 获取HttpResponse实例
HttpResponse httpResp =
httpClient.execute(httpPost);
// 判断是够请求成功
if
(httpResp.getStatusLine().getStatusCode() == 200) {
//
获取返回的数据
result = EntityUtils.toString(httpResp.getEntity(),
"UTF-8");
} else {
Log.i("HttpPost",
"HttpPost方式请求失败");
}

return result;

}

其次Json数据解析：
json数据：[{"id":"67","biaoTi":"G","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741845270.png","logoLunbo":"http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg","yuanJia":"0","xianJia":"0"},{"id":"64","biaoTi":"444","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741704400.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741738500.png","yuanJia":"0","xianJia":"0"},{"id":"62","biaoTi":"jhadasd","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741500450.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741557450.png","yuanJia":"1","xianJia":"0"}]

复制代码
代码如下:

/**
* 解析
*
*
@throws JSONException
*/
private static
ArrayList<HashMap<String, Object>> Analysis(String
jsonStr)
throws JSONException {
/*******************
解析 ***********************/
JSONArray jsonArray = null;

// 初始化list数组对象
ArrayList<HashMap<String, Object>> list =
new ArrayList<HashMap<String, Object>>();
jsonArray =
new JSONArray(jsonStr);
for (int i = 0; i < jsonArray.length();
i++) {
JSONObject jsonObject =
jsonArray.getJSONObject(i);
// 初始化map数组对象

HashMap<String, Object> map = new HashMap<String,
Object>();
map.put("logo",
jsonObject.getString("logo"));
map.put("logoLunbo",
jsonObject.getString("logoLunbo"));
map.put("biaoTi",
jsonObject.getString("biaoTi"));
map.put("yuanJia",
jsonObject.getString("yuanJia"));
map.put("xianJia",
jsonObject.getString("xianJia"));
map.put("id",
jsonObject.getInt("id"));
list.add(map);

}
return list;
}

最后数据适配：

1、TextView

复制代码
代码如下:

/**
* readParse（String）从服务器端获取数据

* Analysis（String）解析json数据
*/
private void resultJson()
{
try {
allData =
Analysis(readParse(url));
Iterator<HashMap<String,
Object>> it = allData.iterator();
while (it.hasNext())
{
Map<String, Object> ma =
it.next();
if ((Integer) ma.get("id") == id)
{
biaoTi.setText((String)
ma.get("biaoTi"));
yuanJia.setText((String)
ma.get("yuanJia"));
xianJia.setText((String)
ma.get("xianJia"));
}
}
} catch
(JSONException e) {
e.printStackTrace();
} catch
(Exception e) {
e.printStackTrace();
}

}

2、ListView：

复制代码
代码如下:

/**
* ListView 数据适配

*/
private void product_data(){
List<HashMap<String,
Object>> lists = null;
try {
lists =
Analysis(readParse(url));//解析出json数据
} catch (Exception e)
{
// TODO Auto-generated catch block

e.printStackTrace();
}
List<HashMap<String,
Object>> data = new
ArrayList<HashMap<String,Object>>();

for(HashMap<String, Object> news : lists){

HashMap<String, Object> item = new HashMap<String,
Object>();
item.put("chuXingTianShu",
news.get("chuXingTianShu"));
item.put("biaoTi",
news.get("biaoTi"));
item.put("yuanJia",
news.get("yuanJia"));
item.put("xianJia",
news.get("xianJia"));
item.put("id",
news.get("id"));

try {
bitmap =
ImageService.getImage(news.get("logo").toString());//图片从服务器上获取
}
catch (Exception e) {
// TODO Auto-generated catch
block
e.printStackTrace();
}

if(bitmap==null){
Log.i("bitmap",
""+bitmap);
Toast.makeText(TravelLine.this, "图片加载错误",
Toast.LENGTH_SHORT)

.show(); // 显示图片编号

}
item.put("logo",bitmap);

data.add(item);
}
listItemAdapter = new
MySimpleAdapter1(TravelLine.this,data,R.layout.a_travelline_item,

// 动态数组与ImageItem对应的子项
new String[] { "logo",
"biaoTi",
"xianJia", "yuanJia",
"chuXingTianShu"},
//
ImageItem的XML文件里面的一个ImageView,两个TextView ID
new
int[] { R.id.trl_ItemImage,
R.id.trl_ItemTitle,
R.id.trl_ItemContent,
R.id.trl_ItemMoney,

R.id.trl_Itemtoday});

listview.setAdapter(listItemAdapter);
//添加点击

listview.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0,
View arg1, int arg2,
long arg3) {

login_publicchannel_trl_sub(arg2);
}

});
}

对于有图片的要重写适配器

复制代码
代码如下:

package
com.nuoter.adapterUntil;

import java.util.HashMap;
import
java.util.List;

import android.content.Context;
import
android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import
android.graphics.Paint;
import android.net.Uri;
import
android.view.LayoutInflater;
import android.view.View;
import
android.view.ViewGroup;
import android.widget.BaseAdapter;
import
android.widget.ImageView;
import android.widget.LinearLayout;
import
android.widget.TextView;

public class MySimpleAdapter1 extends
BaseAdapter {
private LayoutInflater mInflater;
private
List<HashMap<String, Object>> list;
private int layoutID;

private String flag[];
private int ItemIDs[];

public MySimpleAdapter1(Context context, List<HashMap<String,
Object>> list,
int layoutID, String flag[], int
ItemIDs[]) {
this.mInflater = LayoutInflater.from(context);

this.list = list;
this.layoutID = layoutID;

this.flag = flag;
this.ItemIDs = ItemIDs;

}
@Override
public int getCount() {
// TODO
Auto-generated method stub
return list.size();
}

@Override
public Object getItem(int arg0) {
//
TODO Auto-generated method stub
return 0;
}

@Override
public long getItemId(int arg0) {
// TODO
Auto-generated method stub
return 0;
}

@Override
public View getView(int position, View convertView,
ViewGroup parent) {
convertView = mInflater.inflate(layoutID,
null);
// convertView = mInflater.inflate(layoutID, null);

for (int i = 0; i < flag.length; i++) {//备注1

if (convertView.findViewById(ItemIDs[i]) instanceof ImageView) {

ImageView imgView = (ImageView)
convertView.findViewById(ItemIDs[i]);

imgView.setImageBitmap((Bitmap)
list.get(position).get(flag[i]));///////////关键是这句!!!!!!!!!!!!!!!

}else if (convertView.findViewById(ItemIDs[i]) instanceof TextView) {

TextView tv = (TextView)
convertView.findViewById(ItemIDs[i]);
tv.setText((String)
list.get(position).get(flag[i]));
}else{

//...备注2
}
}

//addListener(convertView);
return convertView;
}

/* public void addListener(final View convertView) {

ImageView imgView =
(ImageView)convertView.findViewById(R.id.lxs_item_image);

} */

}

对于图片的获取，json解析出来的是字符串url："logoLunbo":http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg
从url获取图片

ImageService工具类

复制代码
代码如下:

package
com.nuoter.adapterUntil;

import
java.io.ByteArrayOutputStream;
import java.io.InputStream;
import
java.net.HttpURLConnection;
import java.net.URL;

import
android.graphics.Bitmap;
import
android.graphics.BitmapFactory;

public class ImageService
{

/**
* 获取网络图片的数据
* @param path 网络图片路径
*
@return
*/
public static Bitmap getImage(String path) throws
Exception{

/*URL url = new URL(imageUrl);

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

InputStream is = conn.getInputStream();
mBitmap =
BitmapFactory.decodeStream(is);*/
Bitmap bitmap= null;

URL url = new URL(path);
HttpURLConnection conn =
(HttpURLConnection) url.openConnection();//基于HTTP协议连接对象

conn.setConnectTimeout(5000);

conn.setRequestMethod("GET");
if(conn.getResponseCode() ==
200){
InputStream inStream =
conn.getInputStream();
bitmap =
BitmapFactory.decodeStream(inStream);
}
return
bitmap;
}

/**
* 读取流中的数据从url获取json数据
*
@param inStream
* @return
* @throws Exception

*/
public static byte[] read(InputStream inStream) throws
Exception{
ByteArrayOutputStream outStream = new
ByteArrayOutputStream();
byte[] buffer = new byte[1024];

int len = 0;
while( (len = inStream.read(buffer)) !=
-1){
outStream.write(buffer, 0, len);
}

inStream.close();
return outStream.toByteArray();
}

}

上面也将从url处获取网络数据写在了工具类ImageService中方面调用，因为都是一样的。

当然也可以在Activity类中写一个获取服务器图片的函数（当用处不多时）

复制代码
代码如下:

* 从服务器取图片
*
参数：String类型
* 返回：Bitmap类型

public static
Bitmap getHttpBitmap(String urlpath) {
Bitmap bitmap =
null;
try {
//生成一个URL对象
URL url =
new URL(urlpath);
//打开连接
HttpURLConnection conn
= (HttpURLConnection)url.openConnection();
//
conn.setConnectTimeout(6*1000);
//
conn.setDoInput(true);
conn.connect();

//得到数据流
InputStream inputstream =
conn.getInputStream();
bitmap =
BitmapFactory.decodeStream(inputstream);
//关闭输入流

inputstream.close();
//关闭连接

conn.disconnect();
} catch (Exception e) {

Log.i("MyTag", "error:"+e.toString());
}
return
bitmap;
}

调用：

复制代码
代码如下:

public ImageView
pic;
.....
.....
allData=Analysis(readParse(url));
Iterator<HashMap<String,
Object>>
it=allData.iterator();
while(it.hasNext()){
Map<String, Object>
ma=it.next();
if((Integer)ma.get("id")==id)
{
logo=(String)
ma.get("logo");
bigpic=getHttpBitmap(logo);
}
}
pic.setImageBitmap(bigpic);

另附下载数据很慢时建立子线程并传参：

复制代码
代码如下:

new Thread() {

@Override
public void run() {
//
参数列表
List<NameValuePair> nameValuePairs = new
ArrayList<NameValuePair>();
nameValuePairs.add(new
BasicNameValuePair("currPage", Integer

.toString(1)));
nameValuePairs.add(new
BasicNameValuePair("pageSize", Integer

.toString(5)));
try {
String result
= doPost(nameValuePairs, POST_URL);

Message msg = handler.obtainMessage(1, 1, 1, result);

handler.sendMessage(msg); // 发送消息
}
catch (Exception e) {
// TODO Auto-generated catch
block
e.printStackTrace();

}
}
}.start();

//
定义Handler对象
handler = new Handler() {
public void
handleMessage(Message msg) {
switch (msg.what)
{
case 1:{
//
处理UI
StringBuffer strbuf = new
StringBuffer();
List<HashMap<String,
Object>> lists = null;
try
{
lists =
MainActivity.this

.parseJson(msg.obj.toString());
} catch (Exception e)
{
// TODO Auto-generated catch
block
e.printStackTrace();

}
List<HashMap<String, Object>> data = new
ArrayList<HashMap<String,Object>>();

for(HashMap<String, Object> news : lists){

HashMap<String, Object> item = new HashMap<String,
Object>();
item.put("id",
news.get("id"));
item.put("ItemText0",
news.get("name"));

try
{
bitmap =
ImageService.getImage(news.get("logo").toString());

} catch (Exception e) {
// TODO Auto-generated
catch block

e.printStackTrace();
}

if(bitmap==null){
Log.i("bitmap",
""+bitmap);
Toast.makeText(MainActivity.this,
"图片加载错误", Toast.LENGTH_SHORT)

.show(); //
显示图片编号
}

item.put("ItemImage",bitmap);

data.add(item);
}

//生成适配器的ImageItem <====> 动态数组的元素，两者一一对应

MySimpleAdapter saImageItems = new MySimpleAdapter(MainActivity.this, data,

R.layout.d_travelagence_item,

new String[] {"ItemImage", "ItemText0",
"ItemText1"},
new int[] {R.id.lxs_item_image,
R.id.lxs_item_text0, R.id.lxs_item_text1});

//添加并且显示

gridview.setAdapter(saImageItems);
}

break;
default:

break;
}

}

};

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