JsonUtil工具类

Posted 2020-07-19 邓博泽

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了JsonUtil工具类相关的知识，希望对你有一定的参考价值。

package comm;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.object.DateMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
import net.sf.json.util.JSONUtils;
import net.sf.json.xml.XMLSerializer;
public class JsonUtil {
/**
* 设置日期转换格式
*/
static {
//注册器
MorpherRegistry mr = JSONUtils.getMorpherRegistry();
//可转换的日期格式，即Json串中可以出现以下格式的日期与时间
DateMorpher dm = new DateMorpher(new String[] { Util.YYYY_MM_DD,
Util.YYYY_MM_DD_HH_MM_ss, Util.HH_MM_ss, Util.YYYYMMDD,
Util.YYYYMMDDHHMMSS, Util.HHMMss });
mr.registerMorpher(dm);
}
/**
* 从json串转换成实体对象
* @param jsonObjStr e.g. {‘name‘:‘get‘,‘dateAttr‘:‘2009-11-12‘}
* @param clazz Person.class
* @return
*/
public static Object getDtoFromJsonObjStr(String jsonObjStr, Class clazz) {
return JSONObject.toBean(JSONObject.fromObject(jsonObjStr), clazz);
}
/**
* 从json串转换成实体对象，并且实体集合属性存有另外实体Bean
* @param jsonObjStr e.g. {‘data‘:[{‘name‘:‘get‘},{‘name‘:‘set‘}]}
* @param clazz e.g. MyBean.class
* @param classMap e.g. classMap.put("data", Person.class)
* @return Object
*/
public static Object getDtoFromJsonObjStr(String jsonObjStr, Class clazz, Map classMap) {
return JSONObject.toBean(JSONObject.fromObject(jsonObjStr), clazz, classMap);
}
/**
* 把一个json数组串转换成普通数组
* @param jsonArrStr e.g. [‘get‘,1,true,null]
* @return Object[]
*/
public static Object[] getArrFromJsonArrStr(String jsonArrStr) {
return JSONArray.fromObject(jsonArrStr).toArray();
}
/**
* 把一个json数组串转换成实体数组
* @param jsonArrStr e.g. [{‘name‘:‘get‘},{‘name‘:‘set‘}]
* @param clazz e.g. Person.class
* @return Object[]
*/
public static Object[] getDtoArrFromJsonArrStr(String jsonArrStr, Class clazz) {
JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);
Object[] objArr = new Object[jsonArr.size()];
for (int i = 0; i < jsonArr.size(); i++) {
objArr[i] = JSONObject.toBean(jsonArr.getJSONObject(i), clazz);
}
return objArr;
}
/**
* 把一个json数组串转换成实体数组，且数组元素的属性含有另外实例Bean
* @param jsonArrStr e.g. [{‘data‘:[{‘name‘:‘get‘}]},{‘data‘:[{‘name‘:‘set‘}]}]
* @param clazz e.g. MyBean.class
* @param classMap e.g. classMap.put("data", Person.class)
* @return Object[]
*/
public static Object[] getDtoArrFromJsonArrStr(String jsonArrStr, Class clazz,
Map classMap) {
JSONArray array = JSONArray.fromObject(jsonArrStr);
Object[] obj = new Object[array.size()];
for (int i = 0; i < array.size(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
obj[i] = JSONObject.toBean(jsonObject, clazz, classMap);
}
return obj;
}
/**
* 把一个json数组串转换成存放普通类型元素的集合
* @param jsonArrStr e.g. [‘get‘,1,true,null]
* @return List
*/
public static List getListFromJsonArrStr(String jsonArrStr) {
JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);
List list = new ArrayList();
for (int i = 0; i < jsonArr.size(); i++) {
list.add(jsonArr.get(i));
}
return list;
}
/**
* 把一个json数组串转换成集合，且集合里存放的为实例Bean
* @param jsonArrStr e.g. [{‘name‘:‘get‘},{‘name‘:‘set‘}]
* @param clazz
* @return List
*/
public static List getListFromJsonArrStr(String jsonArrStr, Class clazz) {
JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);
List list = new ArrayList();
for (int i = 0; i < jsonArr.size(); i++) {
list.add(JSONObject.toBean(jsonArr.getJSONObject(i), clazz));
}
return list;
}
/**
* 把一个json数组串转换成集合，且集合里的对象的属性含有另外实例Bean
* @param jsonArrStr e.g. [{‘data‘:[{‘name‘:‘get‘}]},{‘data‘:[{‘name‘:‘set‘}]}]
* @param clazz e.g. MyBean.class
* @param classMap e.g. classMap.put("data", Person.class)
* @return List
*/
public static List getListFromJsonArrStr(String jsonArrStr, Class clazz, Map classMap) {
JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);
List list = new ArrayList();
for (int i = 0; i < jsonArr.size(); i++) {
list.add(JSONObject.toBean(jsonArr.getJSONObject(i), clazz, classMap));
}
return list;
}
/**
* 把json对象串转换成map对象
* @param jsonObjStr e.g. {‘name‘:‘get‘,‘int‘:1,‘double‘,1.1,‘null‘:null}
* @return Map
*/
public static Map getMapFromJsonObjStr(String jsonObjStr) {
JSONObject jsonObject = JSONObject.fromObject(jsonObjStr);
Map map = new HashMap();
for (Iterator iter = jsonObject.keys(); iter.hasNext();) {
String key = (String) iter.next();
map.put(key, jsonObject.get(key));
}
return map;
}
/**
* 把json对象串转换成map对象，且map对象里存放的为其他实体Bean
* @param jsonObjStr e.g. {‘data1‘:{‘name‘:‘get‘},‘data2‘:{‘name‘:‘set‘}}
* @param clazz e.g. Person.class
* @return Map
*/
public static Map getMapFromJsonObjStr(String jsonObjStr, Class clazz) {
JSONObject jsonObject = JSONObject.fromObject(jsonObjStr);
Map map = new HashMap();
for (Iterator iter = jsonObject.keys(); iter.hasNext();) {
String key = (String) iter.next();
map.put(key, JSONObject.toBean(jsonObject.getJSONObject(key), clazz));
}
return map;
}
/**
* 把json对象串转换成map对象，且map对象里存放的其他实体Bean还含有另外实体Bean
* @param jsonObjStr e.g. {‘mybean‘:{‘data‘:[{‘name‘:‘get‘}]}}
* @param clazz e.g. MyBean.class
* @param classMap e.g. classMap.put("data", Person.class)
* @return Map
*/
public static Map getMapFromJsonObjStr(String jsonObjStr, Class clazz, Map classMap) {
JSONObject jsonObject = JSONObject.fromObject(jsonObjStr);
Map map = new HashMap();
for (Iterator iter = jsonObject.keys(); iter.hasNext();) {
String key = (String) iter.next();
map.put(key, JSONObject
.toBean(jsonObject.getJSONObject(key), clazz, classMap));
}
return map;
}
/**
* 把实体Bean、Map对象、数组、列表集合转换成Json串
* @param obj
* @return
* @throws Exception String
*/
public static String getJsonStr(Object obj) {
String jsonStr = null;
//Json配置
JsonConfig jsonCfg = new JsonConfig();
//注册日期处理器
jsonCfg.registerJsonValueProcessor(java.util.Date.class,
new JsonDateValueProcessor(Util.YYYY_MM_DD_HH_MM_ss));
if (obj == null) {
return "{}";
}
if (obj instanceof Collection || obj instanceof Object[]) {
jsonStr = JSONArray.fromObject(obj, jsonCfg).toString();
} else {
jsonStr = JSONObject.fromObject(obj, jsonCfg).toString();
}
return jsonStr;
}
/**
* 把json串、数组、集合(collection map)、实体Bean转换成XML
* XMLSerializer API：
* http://json-lib.sourceforge.net/apidocs/net/sf/json/xml/XMLSerializer.html
* 具体实例请参考：
* http://json-lib.sourceforge.net/xref-test/net/sf/json/xml/TestXMLSerializer_writes.html
* http://json-lib.sourceforge.net/xref-test/net/sf/json/xml/TestXMLSerializer_writes.html
* @param obj
* @return
* @throws Exception String
*/
public static String getXMLFromObj(Object obj) {
XMLSerializer xmlSerial = new XMLSerializer();
//Json配置
JsonConfig jsonCfg = new JsonConfig();
//注册日期处理器
jsonCfg.registerJsonValueProcessor(java.util.Date.class,
new JsonDateValueProcessor(Util.YYYY_MM_DD_HH_MM_ss));
if ((String.class.isInstance(obj) && String.valueOf(obj).startsWith("["))
|| obj.getClass().isArray() || Collection.class.isInstance(obj)) {
JSONArray jsonArr = JSONArray.fromObject(obj, jsonCfg);
return xmlSerial.write(jsonArr);
} else {
JSONObject jsonObj = JSONObject.fromObject(obj, jsonCfg);
return xmlSerial.write(jsonObj);
}
}
/**
* 从XML转json串
* @param xml
* @return String
*/
public static String getJsonStrFromXML(String xml) {
XMLSerializer xmlSerial = new XMLSerializer();
return String.valueOf(xmlSerial.read(xml));
}
}
/**
* json日期值处理器实现
* (C) 2009-9-11, jzj
*/
class JsonDateValueProcessor implements JsonValueProcessor {
private String format = Util.YYYY_MM_DD_HH_MM_ss;
public JsonDateValueProcessor() {
}
public JsonDateValueProcessor(String format) {
this.format = format;
}
public Object processArrayValue(Object value, JsonConfig jsonConfig) {
return process(value, jsonConfig);
}
public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
return process(value, jsonConfig);
}
private Object process(Object value, JsonConfig jsonConfig) {
if (value instanceof Date) {
String str = new SimpleDateFormat(format).format((Date) value);
return str;
}
return value == null ? null : value.toString();
}
public String getFormat() {
return format;
}
public void setFormat(String format) {
this.format = format;
}
}

JsonUtilTest

[java] view plain copy

package comm.test;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import junit.framework.TestCase;
import comm.JsonUtil;
/**
* JsonUtil测试类
* (C) 2009-9-11, jzj
*/
public class JsonUtilTest extends TestCase {
/**
* 从json串转换成实体对象，且实体中Date属性能正确转换
* void
*/
public void testGetDtoFromJsonObjStr1() {
String json = "{‘name‘:‘get‘,‘dateAttr‘:‘2009-11-12‘}";
Person ps = (Person) JsonUtil.getDtoFromJsonObjStr(json, Person.class);
//print: get
System.out.println(ps.getName());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//print: 2009-11-12
System.out.println(sdf.format(ps.getDateAttr()));
}
/**
* 从json串转换成实体对象，并且实体集合属性存有另外实体Bean
* void
*/
public void testGetDtoFromJsonObjStr3() {
String json = "{‘data‘:[{‘name‘:‘get‘},{‘name‘:‘set‘}]}";
Map classMap = new HashMap();
classMap.put("data", Person.class);
MyBean myBean = (MyBean) JsonUtil.getDtoFromJsonObjStr(json, MyBean.class,
classMap);
//print: class comm.test.Person name =get
System.out.println(myBean.getData().get(0).getClass() + " name ="
+ ((Person) myBean.getData().get(0)).getName());
//print: class comm.test.Person name =set
System.out.println(myBean.getData().get(1).getClass() + " name ="
+ ((Person) myBean.getData().get(1)).getName());
}
/**
* 把一个json数组串转换成普通数组
* void
*/
public void testGetArrFromJsonArrStr() {
String json = "[‘get‘,1,true,null]";
Object[] objArr = JsonUtil.getArrFromJsonArrStr(json);
for (int i = 0; i < objArr.length; i++) {
System.out.println(objArr[i].getClass() + " " + objArr[i]);
}
/* print:
class java.lang.String get
class java.lang.Integer 1
class java.lang.Boolean true
class net.sf.json.JSONNull null
*/
}
/**
* 把一个json数组串转换成实体数组
* void
*/
public void testGetDtoArrFromJsonArrStr1() {
String json = "[{‘name‘:‘get‘},{‘name‘:‘set‘}]";
Object[] objArr = JsonUtil.getDtoArrFromJsonArrStr(json, Person.class);
for (int i = 0; i < objArr.length; i++) {
System.out.println(objArr[i].getClass() + " name = "
+ ((Person) objArr[i]).getName());
}
/* print:
class comm.test.Person name = get
class comm.test.Person name = set
*/
}
/**
* 把一个json数组串转换成实体数组，且数组元素的属性含有另外实例Bean
* void
*/
public void testGetDtoArrFromJsonArrStr2() {
String json = "[{‘data‘:[{‘name‘:‘get‘}]},{‘data‘:[{‘name‘:‘set‘}]}]";
Map classMap = new HashMap();
classMap.put("data", Person.class);
Object[] objArr = JsonUtil.getDtoArrFromJsonArrStr(json, MyBean.class, classMap);
for (int i = 0; i < objArr.length; i++) {
System.out.println(((MyBean) objArr[i]).getData().get(0).getClass()
+ " name = "
+ ((Person) ((MyBean) objArr[i]).getData().get(0)).getName());
}
/* print:
class comm.test.Person name = get
class comm.test.Person name = set
*/
}
/**
* 把一个json数组串转换成存放普通类型元素的集合
* void
*/
public void testGetListFromJsonArrStr1() {
String json = "[‘get‘,1,true,null]";
List list = JsonUtil.getListFromJsonArrStr(json);
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getClass() + " " + list.get(i));
}
/* print:
class java.lang.String get
class java.lang.Integer 1
class java.lang.Boolean true
class net.sf.json.JSONNull null
*/
}
/**
* 把一个json数组串转换成集合，且集合里存放的为实例Bean
* void
*/
public void testGetListFromJsonArrStr2() {
String json = "[{‘name‘:‘get‘},{‘name‘:‘set‘}]";
List list = JsonUtil.getListFromJsonArrStr(json, Person.class);
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getClass() + " name = "
+ ((Person) list.get(i)).getName());
}
/* print:
class comm.test.Person name = get
class comm.test.Person name = set
*/
}
/**
* 把一个json数组串转换成集合，且集合里的对象的属性含有另外实例Bean
* void
*/
public void testGetListFromJsonArrStr3() {
String json = "[{‘data‘:[{‘name‘:‘get‘}]},{‘data‘:[{‘name‘:‘set‘}]}]";
Map classMap = new HashMap();
classMap.put("data", Person.class);
List list = JsonUtil.getListFromJsonArrStr(json, MyBean.class, classMap);
for (int i = 0; i < list.size(); i++) {
System.out.println(((MyBean) list.get(i)).getData().get(0).getClass()
+ " name = "
+ ((Person) ((MyBean) list.get(i)).getData().get(0)).getName());
}
/* print:
class comm.test.Person name = get
class comm.test.Person name = set
*/
}
/**
&nb
以上是关于JsonUtil工具类的主要内容，如果未能解决你的问题，请参考以下文章

JsonUtil工具类

JsonUtil工具类

JsonUtil jakson工具类

利用Jackson封装常用JsonUtil工具类

Android工具类整合

Android工具类整合