import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.*;
public class JsonUtils {
/**
* 一个String字符串转换为json格式
*@descript
*@param s
*@return
*/
public 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 '\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();
}
public static String nullToJson() {
return "";
}
/**
* 一个obj对象转换为json格式
*@descript
*@param obj
*@return
*/
public 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();
}
public static String numberToJson(Number number) {
return number.toString();
}
public static String dateToJson(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(date);
}
public static String booleanToJson(Boolean bool) {
return bool.toString();
}
/**
* 一个bean对象转换为json格式
*@descript
*@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());
if(name.equals("operatorDate")){
// System.out.print(name);
}
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();
}
/**
*@descript
*@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();
}
/**
* 一个数组集合转换为json格式
*@descript
*@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();
}
/**
* 一个Map集合转换为json格式
*@descript
*@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();
}
/**
* 一个Set集合转换为json格式
*@descript
*@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();
}
/**
* json字符串转换为List
*@descript
*@param jsonStr
*@return
*/
public static List<Map<String, Object>> parseJSONList(String jsonStr){
JSONArray jsonArr = JSONArray.fromObject(jsonStr);
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
Iterator<JSONObject> it = jsonArr.iterator();
while(it.hasNext()){
JSONObject JSON = it.next();
list.add(parseJSONMap(JSON.toString()));
}
return list;
}
/**
* json字符串转换为map
*@descript
*@param jsonStr
*@return
*/
public static Map<String, Object> parseJSONMap(String jsonStr){
Map<String, Object> map = new HashMap<String, Object>();
try {
//最外层解析
JSONObject json = JSONObject.fromObject(jsonStr);
for (Object k : json.keySet()) {
Object v = json.get(k);
//如果内层还是数组的话，继续解析
if (v instanceof JSONArray) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Iterator<JSONObject> it = ((JSONArray) v).iterator();
while (it.hasNext()) {
JSONObject JSON = it.next();
list.add(parseJSONMap(JSON.toString()));
}
map.put(k.toString(), list);
} else {
map.put(k.toString(), v);
}
}
} catch (Exception e) {
map.put("exception", jsonStr);
}
return map;
}
/**
* 根据一个url地址.获取json数据.转换为List
*@descript
*@param url
*@return
*/
public static List<Map<String, Object>> getListByUrl(String url){
try {
//通过HTTP获取JSON数据
InputStream in = new URL(url).openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line;
while((line=reader.readLine())!=null){
sb.append(line);
}
return parseJSONList(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 根据一个url地址.获取json数据.转换为MAP
*@descript
*@param url
*@return
*/
public static Map<String, Object> getMapByUrl(String url){
try {
//通过HTTP获取JSON数据
InputStream in = new URL(url).openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line;
while((line=reader.readLine())!=null){
sb.append(line);
}
return parseJSONMap(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
