Java操作应用——JSON解析
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.Iterator; import org.json.simple.JSONArray; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; public class JsonParseTest { private static final String filePath = "//home//user//Documents//jsonDemoFile.json" ; public static void main(String[] args) { try { // read the json file FileReader reader = new FileReader(filePath); JSONParser jsonParser = new JSONParser(); JSONObject jsonObject = (JSONObject)jsonParser.parse(reader); // get a number from the JSON object Long id = (Long) jsonObject.get( "id" ); System.out.println( "The id is: " + id); // get a String from the JSON object String type = (String) jsonObject.get( "type" ); System.out.println( "The type is: " + type); // get a String from the JSON object String name = (String) jsonObject.get( "name" ); System.out.println( "The name is: " + name); // get a number from the JSON object Double ppu = (Double) jsonObject.get( "ppu" ); System.out.println( "The PPU is: " + ppu); // get an array from the JSON object System.out.println( "Batters:" ); JSONArray batterArray= (JSONArray) jsonObject.get( "batters" ); Iterator i = batterArray.iterator(); // take each value from the json array separately while (i.hasNext()) { JSONObject innerObj = (JSONObject) i.next(); System.out.println( "ID " + innerObj.get( "id" ) + " type " + innerObj.get( "type" )); } // get an array from the JSON object System.out.println( "Topping:" ); JSONArray toppingArray= (JSONArray) jsonObject.get( "topping" ); Iterator j = toppingArray.iterator(); // take each value from the json array separately while (j.hasNext()) { JSONObject innerObj = (JSONObject) j.next(); System.out.println( "ID " + innerObj.get( "id" ) + " type " + innerObj.get( "type" )); } } catch (FileNotFoundException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } catch (ParseException ex) { ex.printStackTrace(); } catch (NullPointerException ex) { ex.printStackTrace(); } } } jsonDemoFile.json { "id" : 0001 , "type" : "donut" , "name" : "Cake" , "ppu" : 0.55 , "batters" : [ { "id" : 1001 , "type" : "Regular" }, { "id" : 1002 , "type" : "Chocolate" }, { "id" : 1003 , "type" : "Blueberry" }, { "id" : 1004 , "type" : "Devil's Food" } ], "topping" : [ { "id" : 5001 , "type" : "None" }, { "id" : 5002 , "type" : "Glazed" }, { "id" : 5005 ,
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