java中json常用工具,java常用工具类（二）—— JSON处理工具类
package com.springboot.commons.utils;
import com.springboot.commons.scan.JacksonObjectMapper;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import java.io.IOException;
import java.util.Iterator;
/**
* @author Lius
* @date 2018/10/26 14:34
* @description JSON 工具类
*/
public class JsonUtils {
private static final String JSONARRAY = "net.sf.json.JSONArray";
public JsonUtils() {
}
private static ObjectMapper getInstance() {
return JacksonHolder.INSTANCE;
}
private static class JacksonHolder {
private static ObjectMapper INSTANCE = new JacksonObjectMapper();
}
/**
* 将对象序列化成JSON对象
*
* @param object java对象
* @author Lius
* @date 2018/10/26 14:37
*/
public static String toJson(Object object) {
try {
return getInstance().writeValueAsString(object);
} catch (JsonProcessingException e) {
throw new RuntimeException();
}
}
/**
* 将json反序列化成java对象
*
* @param jsonString 需要序列化的json字符串
* @param valueType 序列化成的对象
* @author Lius
* @date 2018/10/26 14:42
*/
public static T parse(String jsonString, Class valueType) {
try {
return getInstance().readValue(jsonString, valueType);
} catch (IOException e) {
throw new RuntimeException();
}
}
/**
* 判断所有json字段是否全为空
*
* @param jsonObj JSON 对象
* @author Lius
* @date 2018/10/26 14:51
*/
public boolean isAllFieldNotNull(Object jsonObj) throws Exception {
boolean flag = false;
if (jsonObj == null) {
return false;
}
String type = jsonObj.getClass().getName();
// Object对象
if (!JSONARRAY.equals(type)) {
JSONObject jsonObject = JSONObject.fromObject(jsonObj);
Iterator iterator = jsonObject.keys();
while (iterator.hasNext()) {
String key = (String) iterator.next();
if (jsonObject.get(key) != null && !"".equals(jsonObject.get(key))) {
flag = true;
}
}
return flag;
} else {
JSONArray jsonArray = JSONArray.fromObject(jsonObj);
for (Object object : jsonArray) {
JSONObject jsonObject = JSONObject.fromObject(object);
Iterator iterator = jsonObject.keys();
while (iterator.hasNext()) {
String key = (String) iterator.next();
if (jsonObject.get(key) != null && !"".equals(jsonObject.get(key))) {
flag = true;
}
}
return flag;
}
}
return true;
}
/**
* 把JSON字符串转换为Map形式
* @author Lius
* @date 2018/11/8 9:19
*/
public static Map jSON2Map(String jsonStr) {
Map map = new HashMap();
JSONObject json = JSONObject.fromObject(jsonStr);
for (Object k : json.keySet()) {
Object v = json.get(k);
if (v instanceof JSONArray) {
List> list = new ArrayList>();
Iterator it = ((JSONArray) v).iterator();
while (it.hasNext()) {
Object json2 = it.next();
list.add(jSON2Map(json2.toString()));
}
map.put(k.toString(), list);
} else {
map.put(k.toString(), v);
}
}
return map;
}
public static void main(String[] args) {
String json = "{"name":"zhangsan","age":20,"loginName":"loginName","password":"[email protected]"}";
}
}
JacksonObjectMapper 代码如下
package com.springboot.commons.scan;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;
/**
* 解决Jackson 差8小时的问题
* @author Lius
*/
@Component("jacksonObjectMapper")
public class JacksonObjectMapper extends ObjectMapper {
private static final long serialVersionUID = 4288193147502386170L;
private static final Locale CHINA = Locale.CHINA;
public JacksonObjectMapper() {
this.setLocale(CHINA);
this.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", CHINA));
this.setTimeZone(TimeZone.getTimeZone("GMT+8"));
}
}