android中json解析及使用（中）

野性酷女 2022-04-17 06:21 229阅读 0赞

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[接上文][Link 1]

六、通过JSONObject与JSONArray来解析json

我们可以通过JSONObject与 JSONArray 的getInt，getString,getDouble,getJSONArray，getJSONObject等函数来解析json.

以下是一个通过网络取得json文本，然后解析的示例。

示例3

public  AppGuessResponse  getAppListFromHttp ( Context  mContext )

String  url  =  "http://10.158.166.110:8080/AndroidServer/JsonServlet" ;

AppGuessResponse  res  =  new  AppGuessResponse ();

try

HttpReturn  ret  =  getDataFromHttp ( url );

if  ( ret . getCode ()  ==  HttpStatus . SC\_OK )

res . parseFrom ( ret . getBody ());

\}  catch  ( Exception  e )

Log . e ( tag ,  "" ,  e );

return  res ;

public  HttpReturn  getDataFromHttp ( String  url )      \{          /\* HttpGet对象\*/          HttpGet  httpRequest  =  new  HttpGet ( url );          int  code  =  \- 1 ;          try          \{              /\* HttpClient对象\*/              HttpClient  httpClient  =  new  DefaultHttpClient ();              /\* 获得HttpResponse对象\*/              HttpResponse  httpResponse  =  httpClient . execute ( httpRequest );             code  =  httpResponse . getStatusLine (). getStatusCode ();              if  ( code  ==  HttpStatus . SC\_OK )              \{                  // 取得返回的数据                  byte  bytes \[\]  =  EntityUtils                          . toByteArray ( httpResponse . getEntity ());                  return  new  BaseHttpReturn ( code ,  bytes );              \}  else              \{                  return  new  BaseHttpReturn ( code );              \}          \}  catch  ( ClientProtocolException  e )          \{             e . printStackTrace ();          \}  catch  ( IOException  e )          \{             e . printStackTrace ();          \}          return  new  BaseHttpReturn ( code );      \}

interface  HttpReturn

int  getCode ();

byte \[\]  getBody ();

class  BaseHttpReturn  implements  HttpReturn

final  int  code ;

final  byte  body \[\];

BaseHttpReturn ( int  code )

this . code  =  code ;

this . body  =  null ;

BaseHttpReturn ( int  code ,  byte  bytes \[\])

this . code  =  code ;

this . body  =  bytes ;

@Override

public  int  getCode ()

// TODO Auto-generated method stub

return 0;

@Override

public  byte \[\]  getBody ()

// TODO Auto-generated method stub

return null;

interface  ResponseParse

public  void  parseFrom ( byte \[\]  bytes );

public  void  parseFrom ( String  str );

class  Application

String  name ;

String  packageName ;

String  version ;

int  versionCode ;

double  price ;

long  size ;

long  downloadCount ;

public  long  getDownloadCount ()

return  downloadCount ;

public  void  setDownloadCount ( long  downloadCount )

this . downloadCount  =  downloadCount ;

public  long  getSize ()

return  size ;

public  void  setSize ( long  size )

this . size  =  size ;

public  String  getName ()

return  name ;

public  void  setName ( String  name )

this . name  =  name ;

public  String  getPackageName ()

return  packageName ;

public  void  setPackageName ( String  packageName )

this . packageName  =  packageName ;

public  String  getVersion ()

return  version ;

public  void  setVersion ( String  version )

this . version  =  version ;

public  int  getVersionCode ()

return  versionCode ;

public  void  setVersionCode ( int  versionCode )

this . versionCode  =  versionCode ;

public  double  getPrice ()

return  price ;

public  void  setPrice ( double  price )

this . price  =  price ;

class  AppGuessResponse  implements  ResponseParse

private  List < Application >  mApplications  =  new  ArrayList < Application >();

private  boolean  mIsFinish  =  false ;

private  boolean  mIsSuccess  =  false ;

private  int  allCount  =  0 ;

private  Date  expireDate  =  new  Date ( System . currentTimeMillis ()  \+  24  \*  60

\*  60  \*  1000 );

public  Date  getExpireDate ()

return  expireDate ;

public  void  setExpireDate ( Date  expireDate )

this . expireDate  =  expireDate ;

public  int  getAllCount ()

return  allCount ;

public  void  setAllCount ( int  allCount )

this . allCount  =  allCount ;

public  boolean  getIsSuccess ()

return  mIsSuccess ;

public  Application  getApplicationItem ( int  i )

return  mApplications . get ( i );

public  int  getApplicationItemCount ()

return  mApplications . size ();

public  List < Application >  getApplicationItemList ()

return  mApplications ;

public  boolean  isFinish ()

return  mIsFinish ;

@Override

public  void  parseFrom ( byte \[\]  bytes )

// TODO Auto-generated method stub

@Override

public  void  parseFrom ( String  strJson )

try

JSONObject  jsonObject  =  new  JSONObject ( strJson );

if  ( jsonObject . has ( "endpage" ))

mIsFinish  =  jsonObject . getInt ( "endpage" )  ==  0  ?  true  :  false ;

\}  else

mIsFinish  =  false ;

if  ( jsonObject . has ( "allcount" ))

allCount  =  jsonObject . getInt ( "allcount" );

if  ( jsonObject . has ( "list" ))

JSONArray  jsonArray  =  jsonObject . getJSONArray ( "list" );

if  ( jsonArray . length ()  !=  0 )

for  ( int  i  =  0 ;  i  <  jsonArray . length ();  i \++)

JSONObject  jsonObject2  =  jsonArray . getJSONObject ( i );

Application  app  =  new  Application ();

app . setName ( jsonObject2 . getString ( "name" ));

app . setPackageName ( jsonObject2 . getString ( "packageName" ));

app . setSize ( jsonObject2 . getLong ( "size" ));

app . setPrice ( jsonObject2 . optDouble ( "price" ,  0.0 ));

app . setVersion ( jsonObject2 . getString ( "version" ));

app . setVersionCode ( jsonObject2 . getInt ( "versioncode" ));

if  ( jsonObject2 . has ( "downloadCount" ))

app . setDownloadCount ( jsonObject2 . optLong (

"downloadCount" ,  0 ));

mApplications . add ( app );

mIsSuccess  =  true ;

\}  catch  ( JSONException  e )

mIsSuccess  =  false ;

[接下文][Link 2]

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