Jackson解析json字符串入门
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 {
private static final ObjectMapper objectMapper = new ObjectMapper();
static {
objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
private static final ObjectMapper objectMapper = new ObjectMapper();
static {
objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
public static void main(String args[]){
try {
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 (Exception e) {
e.printStackTrace();
}
}
}
、、、、、、、、、输出:
Name: Mahesh Kumar
Age: 21
Verified: No
Marks: [ 100 90 85 ]