package com.cloud.mina.util;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.Date;
import java.util.List;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.commons.lang.StringUtils;
/**
* json操作类
*/
public class JsonUtil {
/**
* check the string is bad json
* @param json
* @return
*/
public static boolean isBadJson(String json) {
return !isGoodJson(json);
}
/**
* check the string is good json
* @param json
* @return
*/
public static boolean isGoodJson(String json) {
if (StringUtils.isBlank(json)) {
return false;
}
try {
JSONObject.fromObject(json);
} catch (Exception e) {
return false;
}
return true;
}
public static void main(String[] args) {
System.out.println(isGoodJson("ww"));
System.out.println(isBadJson("ww"));
}
/**
* 功能描述:传入一个 javabean对象生成一个json格式的字符串
* @param bean
* @return String
*/
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) {
e.printStackTrace();
}
}
json.setCharAt(json.length() - 1, '}');
} else {
json.append("}");
}
return json.toString();
}
/**
* 功能描述:传入任意一个 Object对象生成一个json格式的字符串
* @param object 任意对象
* @return String
*/
@SuppressWarnings("rawtypes")
public static String objectToJson(Object object) {
StringBuilder json = new StringBuilder();
if (object == null) {
json.append("\"\"");//输出双引号
} else if (object instanceof String
|| object instanceof Integer
|| object instanceof Long
|| object instanceof Boolean
|| object instanceof Date
|| object instanceof java.sql.Date) {
json.append("\"").append(object.toString()).append("\"");
} else if (object instanceof List) {
json.append(listToJson((List)object));
}else {
json.append(beanToJson(object));
}
return json.toString();
}
/**
* 功能描述:通过传入一个列表对象,调用指定方法将列表中的数据生成一个JSON规格指定字符串
* @param list 列表对象
* @return String
*/
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();
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0 if null other wise return the field value
*/
public static JSONArray getJsonParamterArray(JSONObject jo,String field){
JSONArray re_str = new JSONArray();
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getJSONArray(field);
}
return re_str;
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0 if null other wise return the field value
*/
public static JSONObject getJsonParamterObject(JSONObject jo,String field){
JSONObject re_str = new JSONObject();
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getJSONObject(field);
}
return re_str;
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0 if null other wise return the field value
*/
public static String getJsonParamterString(JSONObject jo,String field){
String re_str = "";
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getString(field);
}
return re_str;
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0 if null other wise return the field value
*/
public static int getJsonParamterInteger(JSONObject jo,String field){
int re_str = 0;
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getInt(field);
}
return re_str;
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0l if null other wise return the field value
*/
public static long getJsonParamterLong(JSONObject jo,String field){
long re_str = 0l;
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getLong(field);
}
return re_str;
}
/**
* get jsonobject's field value
* @param jo
* @param field
* @return 0d if null other wise return the field value
*/
public static double getJsonParamterDouble(JSONObject jo,String field){
double re_str = 0d;
if(jo!=null&&jo.containsKey(field)){
re_str = jo.getDouble(field);
}
return re_str;
}
/**
* 添加一个JSON对象（Key/Value）到JSON数组末尾
* @param arr
* @param key
* @param value
* @return JSONArray
*/
public static JSONArray addEntryToJsonArray(JSONArray arr,String key,String value){
JSONObject jo = new JSONObject();
jo.put(key, value);
arr.add(jo);
return arr;
}
}