1.解析Json
1 /*
2 * test.josn内容如下:
3 {
4 "languages":[
5 {"id":"1","name":"Java","ide":"Eclipse"}
6 ,{"id":"2","name":"Swift","ide":"Xcode"}
7 ,{"id":"3","name":"C#","ide":"Visual studio"}
8 ]
9 ,"cat":"it"
10 }
11 */
12 void json_parser(){
13 try {
14 InputStreamReader isr =
new InputStreamReader(getAssets().open(
"test.json"),
"utf-8");
15 BufferedReader br =
new BufferedReader(isr);
16 String line;
17 StringBuilder builder =
new StringBuilder();
18 while ((line = br.readLine() ) !=
null) {
19 builder.append(line);
20 }
21 br.close();
22 isr.close();
23
24 JSONObject root =
new JSONObject(builder.toString());
25
26 /* 1.解析languages
27 "languages":[
28 {"id":"1","name":"Java","ide":"Eclipse"}
29 ,{"id":"2","name":"Swift","ide":"Xcode"}
30 ,{"id":"3","name":"C#","ide":"Visual studio"}
31 ]
32 */
33 JSONArray languagesArray = root.getJSONArray(
"languages");
34
35 output.setText(
"");
36 for (
int i =
0; i < languagesArray.length(); i++
) {
37 JSONObject lan =
languagesArray.getJSONObject(i);
38 output.append(
"\n");
39 output.append(
"\t id = " + lan.getInt(
"id"));
40 output.append(
"\t name = " + lan.getString(
"name"));
41 output.append(
"\t ide = " + lan.getString(
"ide"));
42 output.append(
"\n");
43 }
44 /*
45 * 2.解析cat
46 * "cat":"it"
47 */
48 output.append(
"\n\t cat = " + root.getString(
"cat"));
49
50 }
catch (IOException e) {
51 output.append(e.getMessage());
52 e.printStackTrace();
53 }
catch (JSONException e) {
54 output.append(e.getMessage());
55 e.printStackTrace();
56 }
57 }
2.创建Json
1 void create_json(){
2 JSONObject root =
new JSONObject();
3 try {
4 /*
5 * 1.创建 "cat"
6 * "cat":"it"
7 */
8 root.put(
"cat",
"it");
9
10 /*
11 * 2.创建 "languages"
12 * "languages":[
13 {"id":"1","name":"Java","ide":"Eclipse"}
14 ,{"id":"2","name":"Swift","ide":"Xcode"}
15 ,{"id":"3","name":"C#","ide":"Visual studio"}
16 ]
17 */
18 JSONObject lan1 =
new JSONObject();
19 lan1.put(
"id",
1);
20 lan1.put(
"name",
"Java");
21 lan1.put(
"ide",
"Eclipse");
22
23 JSONObject lan2 =
new JSONObject();
24 lan2.put(
"id",
2);
25 lan2.put(
"name",
"Swift");
26 lan2.put(
"ide",
"Xcode");
27
28 JSONObject lan3 =
new JSONObject();
29 lan3.put(
"id",
3);
30 lan3.put(
"name",
"C#");
31 lan3.put(
"ide",
"Visual studio");
32
33 JSONArray languagesArray =
new JSONArray();
34 languagesArray.put(lan1);
35 languagesArray.put(lan2);
36 languagesArray.put(lan3);
37
38 root.put(
"languages", languagesArray);
39
40 output.setText(root.toString());
41
42 }
catch (JSONException e) {
43 e.printStackTrace();
44 }
45 }
转载于:https://www.cnblogs.com/sjjg/p/4664735.html
