import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang3.StringUtils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
/**
* JSONUtil.java
*
* Date: 2013-7-19 下午3:30:55
* Version: 1.0
*
* Copyright(c) 2013 by Highershine
*/
/**
* <p>
* 类/接口 定义
* </p>
*
* 类/接口作用...
*
* @author starwing
*
*/
public class JSONUtil {
private static JSONParser parser;
/**
* 将Json字符串解析为Map
* @param jsonString
* @return
* @throws ParseException
*/
@SuppressWarnings("unchecked")
public static Map<String,Object> parseJsonToMap(String jsonString)
throws ParseException{
Map<String,Object> result = null;
if(parser == null){
parser = new JSONParser();
}
if(!StringUtils.isEmpty(jsonString)){
result = (Map<String,Object>)parser.parse(jsonString);
}
return result;
}
/**
* 将json字符串解析为List
* @param jsonString
* @return
* @throws ParseException
*/
@SuppressWarnings("unchecked")
public static List<Object> parseJsonToList(String jsonString)
throws ParseException{
List<Object> result = null;
if(parser == null){
parser = new JSONParser();
}
if(!StringUtils.isEmpty(jsonString)){
try{
result = (List<Object>)parser.parse(jsonString);
}catch(ParseException e){
System.out.println(e.getMessage());
throw e;
}
}
return result;
}
/**
* 将Json字符串转换为Map
* @param jsonString
* @return
* @throws ParseException
*/
public static Map<String, String> JSONParser(String jsonString)
throws ParseException {
JSONParser parser = new JSONParser();
JSONArray jsonArray = (JSONArray) parser.parse(jsonString);
HashMap<String, String> map = new HashMap<String, String>();
for (int i = 0; i < jsonArray.size(); i++) {
JSONObject obj = (JSONObject) jsonArray.get(i);
// if (!"".equals(obj.get("value").toString().trim())) {
map.put(obj.get("name").toString(), obj.get("value").toString());
// }
}
return map;
}
/**
* 将对象转换为Json字符串
* <br>主方法
* @param obj
* @return
*/
@SuppressWarnings("unchecked")
public static String objectTojson(Object obj) {
StringBuilder json = new StringBuilder();
if (obj == null) {
json.append("\"\"");
} else if (obj instanceof String || obj instanceof Integer
|| obj instanceof Float || obj instanceof Boolean
|| obj instanceof Short || obj instanceof Double
|| obj instanceof Long || obj instanceof BigDecimal
|| obj instanceof BigInteger || obj instanceof Byte) {
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();
}
/**
* Map转换为Json字符串
*<p> 注意：Value值会被转成String类型。
* @param map
* @return
*/
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();
}
/**
* 数组转换为Json字符串
* @param array
* @return
*/
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();
}
/**
* List转换为Json字符串
* @param list
* @return
*/
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();
}
/**
* SET集合转换为json字符串
* @param set
* @return
*/
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();
}
/**
* Bean实体转换为Json字符串
* @param bean
* @return
*/
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) {
System.err.println(e.getMessage());
}
}
json.setCharAt(json.length() - 1, '}');
} else {
json.append("}");
}
return json.toString();
}
/**
* 字符串转为Json字符串
* @param s
* @return
*/
public static String stringTojson(String s) {
if (s == null)
return "";
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 '\n':
sb.append("\\n");
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();
}
}