I have multiple JSON in a single file input.txt:
{"Atlas":{"location":"lille","lat":28.4,"long":51.7,"country":"FR"}}
{"Atlas":{"location":"luxum","lat":24.1,"long":54.7,"country":"LU"}}
{"Atlas":{"location":"ghent","lat":28.1,"long":50.1,"country":"BE"}}
NOTE: they are not separated by comma (",") and they are not array. These are valid single JSON.
I believe it should be possible to get an output.
My code below neither shows an error nor gives an output? What is wrong here?
This is my code:
class Loc{
private String location;
private Long lat;
private Long long;
private String country;
//getter and setter methods
}
public class JsonReader {
public static void main(String[] args) throws ParseException {
try {
BufferedReader br= new BufferedReader(new FileReader("C:\\input.txt"));
String jsonTxt = IOUtils.toString( br );
JSONParser parser = new JSONParser();
String line=null;
while ((line = br.readLine()) != null)
{
Loc emp = (Loc) (new JSONParser().parse(jsonTxt));
System.out.printf("%s",emp.getLocation());
System.out.printf("\t%d",emp.getlat());
System.out.printf("\t%d",emp.getLong());
System.out.printf("\t%s",emp.getCountry()"\n");
}
}catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}}
You're parsing the wrong thing. You should be parsing line
not jsonText
. line
is the actual line read in from the BufferedReader.
You're passing the result of IOUtils.toString(BufferedReader)
to the JSONParser
. As you've noted, the entire file content isn't valid JSON. Assuming that each line is valid JSON, pass the data line-by-line to the parser. Your code is already set up to do this.
In your loop, pass line
to the parser, and get rid of the IOUtils
stuff.
I assume that JSONParser
is org.json.simple.parser.JSONParser
. If so, it won't build your Loc
objects for you without more work on your part: it only parses the JSON and returns a tree of JSONObjects
, JSONArray
, etc. See here and the bit about JSONAware
here .
Or look into Jackson or GSON for parsing your JSON into java objects.
Also, your Loc
member can't be named long
: that's a java keyword, and will prevent your code from compiling.
看起来你需要解析行,而不是jsonTxt
Loc emp = (Loc) (new JSONParser().parse(jsonTxt));
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