JsonUtil.java
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package com.canrd.webmagic.common.utils;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.extern.slf4j.Slf4j;
import java.io.IOException;
/**
*
* @author achims
* @date 2019/11/4
* 用于转换成json字符串以及解析成对象
*/
@Slf4j
public class JsonUtil {
private static ObjectMapper mapper = new ObjectMapper();
static {
log.info("注册jackson-datatype-jsr310的java8时间处理模块");
mapper.findAndRegisterModules();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
@Override
public void serialize(Object paramT, JsonGenerator paramJsonGenerator,
SerializerProvider paramSerializerProvider) throws IOException {
//设置返回null转为 空字符串""
paramJsonGenerator.writeString("");
}
});
}
/**
* Create empty json node
*
* @return
*/
public static ObjectNode createJsonNode() {
return mapper.createObjectNode();
}
/**
* Create empty json Array
*
* @return
*/
public static ArrayNode createJsonArray() {
return mapper.createArrayNode();
}
/**
* Convert the object to corresponding json string
*
* @param obj
* @return
*/
public static String toJsonString(Object obj) {
try {
mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
return mapper.writeValueAsString(obj);
} catch (JsonProcessingException e) {
return null;
}
}
/**
* 转成格式化后的json，便于调试排错
* @param obj
* @return
*/
public static String toJsonStringWithDefaultPretty(Object obj) {
try {
mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
} catch (JsonProcessingException e) {
return null;
}
}
public static <T> T jsonToEntity(String json, Class<T> clazz) {
if (StringUtils.isEmpty(json)) return null;
try {
return mapper.readValue(json, clazz);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 借助json做中转，实体类转实体类
* @param obj 实体
* @param clazz 目标类型
* @param <T> 目标泛型
* @return 结果
*/
public static <T> T entityConvert(Object obj, Class<T> clazz) {
return jsonToEntity(toJsonString(obj), clazz);
}
/**
* 带泛型返回不告警
* @param json json字符
* @param typeReference TypeReference
* @param <R> 返回类型
* @param <T> 转换的类型
* @return 转换结果
* @author 刘迪榕
* @version Date 2022-08-26
*/
public static <R, T extends R> R jsonToEntity(String json, TypeReference<T> typeReference) {
if (StringUtils.isEmpty(json)) return null;
try {
return mapper.readValue(json, typeReference);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static JsonNode readStringAsJsonNode(String json) {
try {
return mapper.readValue(json, JsonNode.class);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static JsonNode valueToTree(Object value) {
return mapper.valueToTree(value);
}
public static <T> T treeToValue(JsonNode jsonNode, Class<T> clazz) {
try {
return mapper.treeToValue(jsonNode, clazz);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 是否爲json格式的數據
*
* @param test
* @return
*/
public final static boolean isJSONValid(String test) {
try {
JSONObject.parseObject(test);
} catch (JSONException ex) {
try {
JSONObject.parseArray(test);
} catch (JSONException ex1) {
return false;
}
}
return true;
}
public <T> T paraseJsonTOClass(String json, Class<T> cla) {
try {
return JSONObject.parseObject(json, cla);
} catch (JSONException ex) {
return null;
}
}
}