Jackson解析json字符串入门

 https://www.yiibai.com/jackson/jackson_tree_model.html

import java.io.IOException;

import java.util.Iterator;

 

import org.codehaus.jackson.JsonNode;

import org.codehaus.jackson.JsonParseException;

import org.codehaus.jackson.map.JsonMappingException;

import org.codehaus.jackson.map.ObjectMapper;

 

public class JacksonTester {

   public static void main(String args[]){

      JacksonTester tester = new JacksonTester();

      try {

         ObjectMapper mapper = new ObjectMapper();

         String jsonString = "{"name":"Mahesh Kumar", "age":21,"verified":false,"marks": [100,90,85]}";

         JsonNode rootNode = mapper.readTree(jsonString);

 

         JsonNode nameNode = rootNode.path("name");

         System.out.println("Name: "+ nameNode.getTextValue());

 

         JsonNode ageNode = rootNode.path("age");

         System.out.println("Age: " + ageNode.getIntValue());

 

         JsonNode verifiedNode = rootNode.path("verified");

         System.out.println("Verified: " + (verifiedNode.getBooleanValue() ? "Yes":"No"));

 

         JsonNode marksNode = rootNode.path("marks");

         Iterator<JsonNode> iterator = marksNode.getElements();

         System.out.print("Marks: [ ");

         while (iterator.hasNext()) {

            JsonNode marks = iterator.next();

            System.out.print(marks.getIntValue() + " "); 

         }

         System.out.println("]");

      } catch (JsonParseException e) {

         e.printStackTrace();

      } catch (JsonMappingException e) {

         e.printStackTrace();

      } catch (IOException e) {

         e.printStackTrace();

      }

   }

}
、、、、、、、、、输出：

Name: Mahesh Kumar

Age: 21

Verified: No

Marks: [ 100 90 85 ]