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
;
}
}
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