準備工作

GSON下載地址:http://download.csdn.net/detail/wiseclown/9496184
官網地址：https://github.com/google/gson

JavaBean(自定義):

public class Student {private String id;private String name;private String sex;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;} }

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讀JSON數(shù)據

//單個對象 String json = "{\"id\":\"0001\",\"name\":\"zs\",\"sex\":\"male\"}"; Gson gson = new Gson(); Student student = gson.fromJson(json,Student.class);//多個對象json數(shù)組 String json = "[{\"id\":\"0001\",\"name\":\"zs\",\"sex\":\"male\"},{\"id\":\"0002\",\"name\":\"ls\",\"sex\":\"male\"}]"; Gson gson = new Gson(); List<Student> studentList = gson.fromJson(json,new TypeToken<List<Student>)(){}.getType();

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從文件中讀取JSON數(shù)據

student2.json
[{“id”:”000001”,”name”:”wz”,”sex”:”male”},
?{“id”:”000002”,”name”:”zs”,”sex”:”male”},
?{“id”:”000003”,”name”:”wf”,”sex”:”female”}
]

File file = new File(Environment.getExternalStorageDirectory(),"student2.json"); Gson gson = new Gson(); try{List<Student> studentList = gson.fromJson(new InputStreamReader(new FileInputStream(file)),new TypeToken<List<Student>(){}.getType()); }catch(FileNotFoundException e){e.printStackTrace(); }

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將JSON數(shù)據寫入文件中

Student student = new Student(); student.setId("1"); student.setName("wz"); student.setSex("male"); Gson gson = new Gson(); String jsonStr = gson.toJson(student);File file = new File(Environment.getExternalStorageDirectory(),"student.json"); try{FileOutputStream out = new FileOutputStream(file);out.write(jsonStr.getBytes("UTF-8")); } catch (FileNotFoundException e) {e.printStackTrace(); } catch (IOException e) {e.printStackTrace(); }

總結

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