Android中Json数据读取与创建

 1 package activity.cyq.datalrearn;
 2 
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.widget.TextView;
 7 
 8 import org.json.JSONArray;
 9 import org.json.JSONException;
10 import org.json.JSONObject;
11 
12 import java.io.BufferedReader;
13 import java.io.IOException;
14 import java.io.InputStream;
15 import java.io.InputStreamReader;
16 
17 
18 public class JsonLearn extends AppCompatActivity {
19     private TextView writeText, readText;
20 
21     @Override
22     protected void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.activity_json_learn);
25 
26         readText = (TextView) findViewById(R.id.readJsonText);
27         writeText = (TextView) findViewById(R.id.writeJsonText);
28 
29         /*读取Json数据*/
30         findViewById(R.id.readJsioBtn).setOnClickListener(new View.OnClickListener() {
31             @Override
32             public void onClick(View v) {
33                 /*获取到assets文件下的TExt.json文件的数据，并以输出流形式返回。*/
34                 InputStream is = JsonLearn.this.getClass().getClassLoader().getResourceAsStream("assets/" + "Text.json");
35                 InputStreamReader streamReader = new InputStreamReader(is);
36                 BufferedReader reader = new BufferedReader(streamReader);
37                 String line;
38                 StringBuilder stringBuilder = new StringBuilder();
39                 try {
40                     while ((line = reader.readLine()) != null) {
41                         // stringBuilder.append(line);
42                         stringBuilder.append(line);
43                     }
44                     reader.close();
45                     reader.close();
46                     is.close();
47                 } catch (IOException e) {
48                     e.printStackTrace();
49                 }
50                 try {
51                     JSONObject person = new JSONObject(stringBuilder.toString());
52                     JSONArray infArray = person.getJSONArray("inf");
53                     for (int i = 0; i < infArray.length(); i++) {
54                         JSONObject inf_Array = infArray.getJSONObject(i);
55                         readText.append("name:" + inf_Array.getString("name") + "\n");
56                         readText.append("IdCard:" + inf_Array.getString("IdCard"));
57                         readText.append("age:" + inf_Array.getInt("age"));
58                         readText.append("married:" + inf_Array.getBoolean("married"));
59                     }
60                 } catch (JSONException e) {
61                     e.printStackTrace();
62                 }
63             }
64         });
65 
66         /*创建Json数据并显示*/
67         findViewById(R.id.writeJsioBtn).setOnClickListener(new View.OnClickListener() {
68             @Override
69             public void onClick(View v) {
70                 try {
71                     JSONObject inf = new JSONObject();
72                     inf.put("number", 1);
73 
74                     JSONArray array = new JSONArray();
75 
76                     JSONObject arr_1 = new JSONObject();
77                     arr_1.put("name", "张三");
78                     arr_1.put("age", 26);
79                     arr_1.put("IdCard", "2345XC");
80                     arr_1.put("married", true);
81 
82                     JSONObject arr_2 = new JSONObject();
83                     arr_2.put("name", "李四");
84                     arr_2.put("age", 45);
85                     arr_2.put("IdCard", "@222DC");
86                     arr_2.put("married", true);
87 
88                     array.put(0, arr_1);
89                     array.put(1, arr_2);
90                     inf.put("inf", array);
91                     writeText.setText(inf.toString());
92 
93                 } catch (JSONException e) {
94                     e.printStackTrace();
95                 }
96             }
97         });
98     }
99 }