J2EE 공통 도구 클래스 - Json 도구 클래스
package cn.org.jshuwei.j2ee.util;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
/**
* Json ， Json ：<br>
*
* <pre>
* User ：
* package cn.org.jshuwei.j2ee.util.test;
*
* public class User {
* private String userName;
* private String userPass;
* private Integer userAge;
*
* public User(){
*
* }
*
* public User(String userName, String userPass, int userAge) {
* super();
* this.userName = userName;
* this.userPass = userPass;
* this.userAge = userAge;
* }
*
* public String getUserName() {
* return userName;
* }
* public void setUserName(String userName) {
* this.userName = userName;
* }
* public String getUserPass() {
* return userPass;
* }
* public void setUserPass(String userPass) {
* this.userPass = userPass;
* }
* public Integer getUserAge() {
* return userAge;
* }
* public void setUserAge(Integer userAge) {
* this.userAge = userAge;
* }
*
* @Override
* public String toString() {
* return "name->"+this.userName+";pass->"+this.userPass+";age->"+this.userAge;
* }
* }
*
* ：
* package cn.org.jshuwei.j2ee.util.test;
*
* import cn.org.jshuwei.j2ee.util.JsonUtils;
*
* public class Test {
*
* public static void main(String[] args) {
* String str1 = "{userName:'huwei', userAge:23, userPass:'123'}";
* String str2 = "[{'userAge':23,'userName':'huwei','userPass':'123'},{'userAge':32,'userName':'jshuwei','userPass':'pass'},{'userAge':'','userName':'userName','userPass':''}]";
* User u = (User)JsonUtils.json2Object(str1, User.class);
* System.out.println("u-->"+u);
* Object[] objs = JsonUtils.json2ObjectArray(str2);
* for(Object obj : objs){
* User u1 = (User)JsonUtils.json2Object(obj.toString(), User.class);
* System.out.println(u1);
* }
* }
* }
*
* </pre>
*
* @author huwei(jshuwei.org.cn)
*
*/
public class JsonUtils {
/**
* Json
*
* @param bean
*
* @return Json
*/
public static String beanToJson(Object bean) {
StringBuilder json = new StringBuilder();
json.append("{");
PropertyDescriptor[] props = null;
try {
props = Introspector.getBeanInfo(bean.getClass(), Object.class)
.getPropertyDescriptors();
} catch (IntrospectionException e) {
}
if (props != null) {
for (int i = 0; i < props.length; i++) {
try {
String name = objectToJson(props[i].getName());
String value = objectToJson(props[i].getReadMethod()
.invoke(bean));
json.append(name);
json.append(":");
json.append(value);
json.append(",");
} catch (Exception e) {
}
}
json.setCharAt(json.length() - 1, '}');
} else {
json.append("}");
}
return json.toString();
}
/**
* List Json
*
* @param list
* List
* @return Json
*/
public static String listToJson(List<?> list) {
StringBuilder json = new StringBuilder();
json.append("[");
if (list != null && list.size() > 0) {
for (Object obj : list) {
json.append(objectToJson(obj));
json.append(",");
}
json.setCharAt(json.length() - 1, ']');
} else {
json.append("]");
}
return json.toString();
}
/**
* Json
*
* @param array
*
* @return Json
*/
public static String arrayToJson(Object[] array) {
StringBuilder json = new StringBuilder();
json.append("[");
if (array != null && array.length > 0) {
for (Object obj : array) {
json.append(objectToJson(obj));
json.append(",");
}
json.setCharAt(json.length() - 1, ']');
} else {
json.append("]");
}
return json.toString();
}
/**
* Map Json
*
* @param map
* Map
* @return Json
*/
public static String mapToJson(Map<?, ?> map) {
StringBuilder json = new StringBuilder();
json.append("{");
if (map != null && map.size() > 0) {
for (Object key : map.keySet()) {
json.append(objectToJson(key));
json.append(":");
json.append(objectToJson(map.get(key)));
json.append(",");
}
json.setCharAt(json.length() - 1, '}');
} else {
json.append("}");
}
return json.toString();
}
/**
* Set Json
*
* @param set
* Set
* @return Json
*/
public static String setToJson(Set<?> set) {
StringBuilder json = new StringBuilder();
json.append("[");
if (set != null && set.size() > 0) {
for (Object obj : set) {
json.append(objectToJson(obj));
json.append(",");
}
json.setCharAt(json.length() - 1, ']');
} else {
json.append("]");
}
return json.toString();
}
private static String numberToJson(Number number) {
return number.toString();
}
private static String booleanToJson(Boolean bool) {
return bool.toString();
}
private static String nullToJson() {
return "";
}
private static String stringToJson(String s) {
if (s == null) {
return nullToJson();
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
switch (ch) {
case '"':
sb.append("\\\"");
break;
case '\\':
sb.append("\\\\");
break;
case '\b':
sb.append("\\b");
break;
case '\f':
sb.append("\\f");
break;
case '
':
sb.append("\
");
break;
case '\r':
sb.append("\\r");
break;
case '\t':
sb.append("\\t");
break;
case '/':
sb.append("\\/");
break;
default:
if (ch >= '\u0000' && ch <= '\u001F') {
String ss = Integer.toHexString(ch);
sb.append("\\u");
for (int k = 0; k < 4 - ss.length(); k++) {
sb.append('0');
}
sb.append(ss.toUpperCase());
} else {
sb.append(ch);
}
}
}
return sb.toString();
}
private static String objectToJson(Object obj) {
StringBuilder json = new StringBuilder();
if (obj == null) {
json.append("\"\"");
} else if (obj instanceof Number) {
json.append(numberToJson((Number) obj));
} else if (obj instanceof Boolean) {
json.append(booleanToJson((Boolean) obj));
} else if (obj instanceof String) {
json.append("\"").append(stringToJson(obj.toString())).append("\"");
} else if (obj instanceof Object[]) {
json.append(arrayToJson((Object[]) obj));
} else if (obj instanceof List) {
json.append(listToJson((List<?>) obj));
} else if (obj instanceof Map) {
json.append(mapToJson((Map<?, ?>) obj));
} else if (obj instanceof Set) {
json.append(setToJson((Set<?>) obj));
} else {
json.append(beanToJson(obj));
}
return json.toString();
}
// ============================================================================================
/**
* Json
*
* @param jsonString
* Json
* @param pojoCalss
*
* @return
*/
@SuppressWarnings("unchecked")
public static Object json2Object(String jsonString, Class pojoCalss) {
Object pojo;
JSONObject jsonObject = JSONObject.fromObject(jsonString);
pojo = JSONObject.toBean(jsonObject, pojoCalss);
return pojo;
}
/**
* Json Map<String,Object>
*
* @param jsonString
* Json
* @return Map<String,Object>
*/
@SuppressWarnings("unchecked")
public static Map<String, Object> json2Map(String jsonString) {
JSONObject jsonObject = JSONObject.fromObject(jsonString);
Iterator keyIter = jsonObject.keys();
String key;
Object value;
Map<String, Object> valueMap = new HashMap<String, Object>();
while (keyIter.hasNext()) {
key = (String) keyIter.next();
value = jsonObject.get(key);
valueMap.put(key, value);
}
return valueMap;
}
/**
* Json
*
* @param jsonString
* Json
* @return
*/
public static Object[] json2ObjectArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
return jsonArray.toArray();
}
/**
* Json List
*
* @param jsonString
* Json
* @param pojoClass
* List
* @return List
*/
@SuppressWarnings("unchecked")
public static List json2List(String jsonString, Class pojoClass) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
JSONObject jsonObject;
Object pojoValue;
List list = new ArrayList();
for (int i = 0; i < jsonArray.size(); i++) {
jsonObject = jsonArray.getJSONObject(i);
pojoValue = JSONObject.toBean(jsonObject, pojoClass);
list.add(pojoValue);
}
return list;
}
/**
* Json
*
* @param jsonString
* Json
* @return
*/
public static String[] json2StringArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
String[] stringArray = new String[jsonArray.size()];
for (int i = 0; i < jsonArray.size(); i++) {
stringArray[i] = jsonArray.getString(i);
}
return stringArray;
}
/**
* Json Long
*
* @param jsonString
* Json
* @return Long
*/
public static Long[] json2LongArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Long[] longArray = new Long[jsonArray.size()];
for (int i = 0; i < jsonArray.size(); i++) {
longArray[i] = jsonArray.getLong(i);
}
return longArray;
}
/**
* Json Integer
*
* @param jsonString
* Json
* @return Integer
*/
public static Integer[] json2IntegerArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Integer[] integerArray = new Integer[jsonArray.size()];
for (int i = 0; i < jsonArray.size(); i++) {
integerArray[i] = jsonArray.getInt(i);
}
return integerArray;
}
/**
* Json
*
* @param jsonString
* Json
* @param DataFormat
*
* @return
*/
public static Date[] json2DateArray(String jsonString, String DataFormat) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Date[] dateArray = new Date[jsonArray.size()];
String dateString;
Date date;
for (int i = 0; i < jsonArray.size(); i++) {
dateString = jsonArray.getString(i);
date = DateUtil.parseDate(dateString, DataFormat);
dateArray[i] = date;
}
return dateArray;
}
/**
* Json Double
*
* @param jsonString
* Json
* @return Double
*/
public static Double[] json2DoubleArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Double[] doubleArray = new Double[jsonArray.size()];
for (int i = 0; i < jsonArray.size(); i++) {
doubleArray[i] = jsonArray.getDouble(i);
}
return doubleArray;
}
}
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