引入依赖

1
2
3
4
5
6
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.10</version>
</dependency>

使用的方法

  1. JsonElement parseString(String json)

    解析json字符串为JsonElement

  2. JsonObject getAsJsonObject()

    将字符串解析为JsonObject对象

  3. JsonObject getAsJsonObject(String memberName)

    获取某个对象

  4. JsonElement get(String memberName)

    获取对象的属性值

  5. String getAsString()

    返回对象属性值的字符串值

测试

要测试的JSON字符串

这次测试是获取data.token.accessToken

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
{
    "code": 2000,
    "msg": null,
    "data": {
        "uuid": null,
        "username": null,
        "nickname": null,
        "avatar": null,
        "blog": null,
        "company": null,
        "location": null,
        "email": null,
        "remark": null,
        "gender": "UNKNOWN",
        "source": "GITHUB",
        "token": {
            "accessToken": "gho_V7z5mRl3zrZAclRnSdhmczkYW2jvx",
            "expireIn": 0,
            "refreshToken": null,
            "uid": null,
            "openId": null,
            "accessCode": null,
            "unionId": null,
            "scope": null,
            "tokenType": "bearer",
            "idToken": null,
            "macAlgorithm": null,
            "macKey": null,
            "code": null,
            "oauthToken": null,
            "oauthTokenSecret": null,
            "userId": null,
            "screenName": null,
            "oauthCallbackConfirmed": null
        }
    }
}

Java代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

/**
 * @author LeDao
 * @company
 * @create 2021-06-21 12:38
 */
public class Test {

    public static void main(String[] args) {
        String json = "{\n" +
                "    \"code\": 2000,\n" +
                "    \"msg\": null,\n" +
                "    \"data\": {\n" +
                "        \"uuid\": null,\n" +
                "        \"username\": null,\n" +
                "        \"nickname\": null,\n" +
                "        \"avatar\": null,\n" +
                "        \"blog\": null,\n" +
                "        \"company\": null,\n" +
                "        \"location\": null,\n" +
                "        \"email\": null,\n" +
                "        \"remark\": null,\n" +
                "        \"gender\": \"UNKNOWN\",\n" +
                "        \"source\": \"GITHUB\",\n" +
                "        \"token\": {\n" +
                "            \"accessToken\": \"gho_V7z5mRl3zrZAclRnSdhmczkYW2jvx\",\n" +
                "            \"expireIn\": 0,\n" +
                "            \"refreshToken\": null,\n" +
                "            \"uid\": null,\n" +
                "            \"openId\": null,\n" +
                "            \"accessCode\": null,\n" +
                "            \"unionId\": null,\n" +
                "            \"scope\": null,\n" +
                "            \"tokenType\": \"bearer\",\n" +
                "            \"idToken\": null,\n" +
                "            \"macAlgorithm\": null,\n" +
                "            \"macKey\": null,\n" +
                "            \"code\": null,\n" +
                "            \"oauthToken\": null,\n" +
                "            \"oauthTokenSecret\": null,\n" +
                "            \"userId\": null,\n" +
                "            \"screenName\": null,\n" +
                "            \"oauthCallbackConfirmed\": null\n" +
                "        }\n" +
                "    }\n" +
                "}";
        //解析json字符串为JsonElement
        JsonElement jsonElement = JsonParser.parseString(json);
        //将json字符串变成对象
        JsonObject root = jsonElement.getAsJsonObject();
        //获取data对象
        JsonObject data = root.getAsJsonObject("data");
        //获取token对象
        JsonObject token = data.getAsJsonObject("token");
        //获取token对象的accessToken属性的值
        String accessToken = token.get("accessToken").getAsString();
        //打印结果
        System.out.println(accessToken);
    }
}

结果

img