Java parsing json file method (i)

First, first, you need to import the relevant jar packages in the Eclipse project , jar package See link: Http://yunpan.alibaba-inc.com/share/link/NdA5b6IFK

Two provide a JSON file to parse, Apkinfo.json is as follows: [{"Name": "Account", "package_name": "Com.android.account", "check_version": "1.2"},{"name": "System Upgrade", " Package_name ":" Com.android.osupdate "," check_version ":" 1.0 "},] Iii. Java code consists of two classes, one is the Util class to read the contents of the file, and the other is the main program test class。 (1) Util.java:Import Java.io.bufferedreader;import Java.io.fileinputstream;import Java.io.ioexception;import  Java.io.InputStreamReader; public class Util {public string ReadFile (string Path) {BufferedReader reader = null; String laststr = ""; Try{fileinputstream FileInputStream = new FileInputStream (Path); InputStreamReader InputStreamReader = new InputStreamReader (FileInputStream, "UTF-8"); reader = new BufferedReader (InputStreamReader); String tempstring = Null;while ((tempstring = Reader.readline ()) = null) {laststr + = tempstring;} Reader.close ();} catch (IOException e) {e.printstacktrace ();} FINALLY{IF (reader! = null) {try {reader.close ();} catch (IOException e) {e.printstacktrace ()}}} return LASTSTR;} } (2) Test.java:Import Java.util.arraylist;import Java.util.iterator;import java.util.List; Import Net.sf.json.jsonarray;import Net.sf.json.JSONObject; public class Test {public static void main (string[] args) {//TODO auto-generated method stubstring Jsoncontext = new Uti L (). ReadFile ("D:\\test\\apkinfo.json"); Jsonarray Jsonarray = Jsonarray.fromobject (jsoncontext); int size = Jsonarray.size (); SYSTEM.OUT.PRINTLN ("Size:" + size); for (int i = 0; i < size; i++) {Jsonobject jsonobject = Jsonarray.getjsonobject (i); System.out.println ("[" + i + "]name=" + jsonobject.get ("name")); System.out.println ("[" + i + "]package_name=" + jsonobject.get ("package_name")); System.out.println ("[" + i + "]check_version=" + jsonobject.get ("check_version"));}}} Iv. The following results have been implemented:Size:2[0]name= account [0]package_name=com.android.account[0]check_version=1.2[1]name= system upgrade [1]package_name= com.android.osupdate[1]check_version=1.0

How Java parses a JSON file (i)