[开发|java] java解析json

朱雀 2024-03-22 21:30 9阅读 0赞

1.  使用Jackson库解析JSON：  
    在Maven项目中，在pom.xml中添加以下依赖:

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.12.5</version>
    </dependency>
    
    
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.12.5</version>
    </dependency>

代码示例：

import com.fasterxml.jackson.databind.JsonNode;
    import com.fasterxml.jackson.databind.ObjectMapper;
    
    public class JsonParserUsingJackson {
        
        public static void main(String[] args) {
        
            String jsonString = "{\"name\": \"John\", \"age\": 30, \"email\": \"john@example.com\"}";
    
            try {
        
                ObjectMapper objectMapper = new ObjectMapper();
                JsonNode jsonNode = objectMapper.readTree(jsonString);
    
                String name = jsonNode.get("name").asText();
                int age = jsonNode.get("age").asInt();
                String email = jsonNode.get("email").asText();
    
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
                System.out.println("Email: " + email);
            } catch (Exception e) {
        
                e.printStackTrace();
            }
        }
    }

1.  使用Gson库解析JSON：  
    添加以下依赖

<dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.9</version>
    </dependency>

示例代码:

import com.google.gson.Gson;
    import com.google.gson.JsonObject;
    
    public class JsonParserUsingGson {
        
        public static void main(String[] args) {
        
            String jsonString = "{\"name\": \"John\", \"age\": 30, \"email\": \"john@example.com\"}";
    
            try {
        
                Gson gson = new Gson();
                JsonObject jsonObject = gson.fromJson(jsonString, JsonObject.class);
    
                String name = jsonObject.get("name").getAsString();
                int age = jsonObject.get("age").getAsInt();
                String email = jsonObject.get("email").getAsString();
    
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
                System.out.println("Email: " + email);
            } catch (Exception e) {
        
                e.printStackTrace();
            }
        }
    }