FastJsonUtil

package cn.itcast.crm.util;


import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


import javax.servlet.http.HttpServletResponse;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;


public class FastJsonUtil {

/**
* 将对象转成json串
* @param object
* @return
*/
public static String toJSONString(Object object){
//DisableCircularReferenceDetect来禁止循环引用检测
return JSON.toJSONString(object,SerializerFeature.DisableCircularReferenceDetect);
}
//输出json
public static void write_json(HttpServletResponse response,String jsonString)
{
response.setContentType("application/json;utf-8");
response.setCharacterEncoding("UTF-8");
try {
response.getWriter().print(jsonString);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* ajax提交后回调的json字符串
* @return
*/
public static String ajaxResult(boolean success,String message)
{
Map map=new HashMap();
map.put("success", success);//是否成功
map.put("message", message);//文本消息
String json= JSON.toJSONString(map);
return json;
}



/**
* JSON串自动加前缀
* @param json 原json字符串
* @param prefix 前缀
* @return 加前缀后的字符串
*/


public static String JsonFormatterAddPrefix(String json,String prefix,Map<String,Object> newmap)
{
if(newmap == null){
newmap = new HashMap();
}
Map<String,Object> map = (Map) JSON.parse(json);


for(String key:map.keySet())
{
Object object=map.get(key);
if(isEntity(object)){
String jsonString = JSON.toJSONString(object);
JsonFormatterAddPrefix(jsonString,prefix+key+".",newmap);

}else{
newmap.put(prefix+key, object);
}

}
return JSON.toJSONString(newmap);
}
/**
* 判断某对象是不是实体
* @param object
* @return
*/
private static boolean isEntity(Object object)
{
if(object instanceof String  )
{
return false;
}
if(object instanceof Integer  )
{
return false;
}
if(object instanceof Long  )
{
return false;
}
if(object instanceof java.math.BigDecimal  )
{
return false;
}
if(object instanceof Date  )
{
return false;
}
if(object instanceof java.util.Collection )
{
return false;
}
return true;

}
}