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方法一:通過(guò)獲取JsonReader對(duì)象解析JSON數(shù)據(jù):
String jsonData = "[{\"username\":\"arthinking\",\"userId\":001},{\"username\":\"Jason\",\"userId\":002}]"; try{ JsonReader reader = new JsonReader(new StringReader(jsonData)); reader.beginArray(); while(reader.hasNext()){ reader.beginObject(); while(reader.hasNext()){ String tagName = reader.nextName(); if(tagName.equals("username")){ System.out.println(reader.nextString()); } else if(tagName.equals("userId")){ System.out.println(reader.nextString()); } } reader.endObject(); } reader.endArray(); } catch(Exception e){ e.printStackTrace(); }
方法二:通過(guò)把JSON數(shù)據(jù)映射成一個(gè)對(duì)象,使用Gson對(duì)象的fromJson()方法獲取一個(gè)對(duì)象數(shù)組進(jìn)行操作:
創(chuàng)建JSON數(shù)據(jù)對(duì)應(yīng)的一個(gè)POJO對(duì)象User.java:
public class User { private String username ; private int userId ; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } }
使用Gson對(duì)象獲取User對(duì)象數(shù)據(jù)進(jìn)行相應(yīng)的操作:
ype listType = new TypeToken<LinkedList<User>>(){}.getType(); Gson gson = new Gson(); LinkedList<User> users = gson.fromJson(jsonData, listType); for (Iterator iterator = users.iterator(); iterator.hasNext();) { User user = (User) iterator.next(); System.out.println(user.getUsername()); System.out.println(user.getUserId()); }
如果要處理的JSON字符串只包含一個(gè)JSON對(duì)象,則可以直接使用fromJson獲取一個(gè)User對(duì)象:
tring jsonData = "{\"username\":\"arthinking\",\"userId\":001}"; Gson gson = new Gson(); User user = gson.fromJson(jsonData, User.class); System.out.println(user.getUsername()); System.out.println(user.getUserId());
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