jackson如何创建json对象和jackson工具类

由于阿里巴巴的fastjson经常爆出漏洞，需要频繁升级版本，单位研发部调研随后决定使用jackson作为json解析的工具，我就粗略研究了一下如何使用jackson创建中间json对象，大致测试如下（建供参考）：

首先添加maven依赖：

      <dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.6</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.9.6</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.6</version></dependency>

构建json对象

 public static void main(String[] args) throws IOException {ObjectMapper mapper = new ObjectMapper();ObjectNode rootNode = mapper.createObjectNode();ObjectNode childNode1 = mapper.createObjectNode();childNode1.put("name1","val1");childNode1.put("name2","val2");rootNode.set("obj1",childNode1);ObjectNode childNode2 = mapper.createObjectNode();childNode2.put("name3","val3");childNode2.put("name4","val4");rootNode.set("obj2",childNode2);ObjectNode childNode3 = mapper.createObjectNode();childNode3.put("name5","val5");childNode3.put("name6","val6");ArrayNode arrayNode = mapper.createArrayNode();arrayNode.add(childNode1);arrayNode.add(childNode2);arrayNode.add(childNode3);rootNode.set("obj3",childNode3);rootNode.set("obj4",arrayNode);String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);System.out.println(jsonString);ObjectNode jsonNodes = mapper.readValue(jsonString, ObjectNode.class);System.out.println(jsonNodes.get("obj4"));System.out.println(jsonNodes);}

输出结果:

{"obj1" : {"name1" : "val1","name2" : "val2"},"obj2" : {"name3" : "val3","name4" : "val4"},"obj3" : {"name5" : "val5","name6" : "val6"},"obj4" : [ {"name1" : "val1","name2" : "val2"}, {"name3" : "val3","name4" : "val4"}, {"name5" : "val5","name6" : "val6"} ]
}
[{"name1":"val1","name2":"val2"},{"name3":"val3","name4":"val4"},{"name5":"val5","name6":"val6"}]
{"obj1":{"name1":"val1","name2":"val2"},"obj2":{"name3":"val3","name4":"val4"},"obj3":{"name5":"val5","name6":"val6"},"obj4":[{"name1":"val1","name2":"val2"},{"name3":"val3","name4":"val4"},{"name5":"val5","name6":"val6"}]}

具体序列化工具大致封装了一下如下：


import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonParser.Feature;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class JSONUtil {private static final Logger log = LoggerFactory.getLogger(JSONUtil.class);public JSONUtil() {}public static String toJSONString(Object data) {if (ObjectUtil.isEmpty(data)) {return "";} else {ObjectMapper objectMapper = new ObjectMapper();objectMapper.setSerializationInclusion(Include.NON_NULL);objectMapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);objectMapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);objectMapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);try {return objectMapper.writeValueAsString(data);} catch (JsonProcessingException var3) {log.error("JSONUtil.toJSONString.error", var3);return "";}}}public static <T> T parseObject(String jsonStr, Class<T> clazz) {if (ObjectUtil.isEmpty(jsonStr)) {return null;} else {ObjectMapper objectMapper = new ObjectMapper();objectMapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);objectMapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);try {return objectMapper.readValue(jsonStr, clazz);} catch (JsonProcessingException var4) {log.error("JSONUtil.parseObject.error", var4);return null;}}}public static <T> T parseObject(String jsonStr, TypeReference<T> valueTypeRef) {if (ObjectUtil.isEmpty(jsonStr)) {return null;} else {ObjectMapper objectMapper = new ObjectMapper();objectMapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);objectMapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);try {return objectMapper.readValue(jsonStr, valueTypeRef);} catch (Exception var4) {log.error("JSONUtil.parseObject.TypeReference.error", var4);return null;}}}public static <T> T parseSnakeObject(String json, Class<T> clazz) {if (ObjectUtil.isEmpty(json)) {return null;} else {ObjectMapper objectMapper = new ObjectMapper();objectMapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);objectMapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);try {return objectMapper.readValue(json, clazz);} catch (JsonProcessingException var4) {log.error("JSONUtil.parseSnakeObject.error", var4);return null;}}}
}

自己查看需要的：更多大请移步官网看用法：jackson-core

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