JSON format conversion

JSON Data Transformation

import java.io.ioexception;import java.io.stringwriter;import java.util.arraylist;import  Java.util.collections;import java.util.linkedhashmap;import java.util.list;import java.util.map ;import org.apache.commons.lang3.stringutils;import org.codehaus.jackson.jsonfactory;import  org.codehaus.jackson.jsongenerator;import org.codehaus.jackson.jsonparseexception;import  org.codehaus.jackson.map.deserializationconfig.feature;import  org.codehaus.jackson.map.jsonmappingexception;import org.codehaus.jackson.map.objectmapper;import  org.codehaus.jackson.type.typereference;import org.json.jsonarray;import org.json.jsonexception; import org.json.jsonobject;public class jsonparse {    /**      *  convert to JSON data      *      * @ param obj     *  @return       */    public static string getjson (Object obj)  {         if  (obj == null)              return null;         Objectmapper om = new objectmapper ();         Stringwriter sw = new stringwriter ();         try  {            jsongenerator jg =  new jsonfactory (). Createjsongenerator (SW);             om.writevalue (jg, obj);             jg.close ();        } catch  (IOException e)  {             e.printstacktrace ();         }        return sw.tostring ();     }     /**     *  convert JSON data to list<object>      *      *  @param  json     * @ param entityclass     *  @return      */     public static <t> list<t> getlist (String json, Class< T> entityclass)  {        if  (Stringutils.isblank ( JSON))             return null;         List<T> list = new ArrayList<T> ();      &nbSp;  objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {            JSONArray  Array = new jsonarray (JSON);             for  (Int i = 0; i < array.length ();  i++)  {                 T t =  Om.readvalue (Array.getstring (i),  entityclass);                 list.add (t);             }            return list;         } catch  (jsonparseexception e)  {             e.printstacktrace ();         }  catch  (jsonmappingexception e)  {             e.printstacktrace ();        } catch  ( Ioexception e)  {             E.printstacktrace ();        } catch  (JSONException e)  {            e.printstacktrace ();         }        return null;     }    /**     *  convert JSON data to list< Linkedhashmap<string, object>>     *      *  @param  json      *  @return      */     @SuppressWarnings ("unchecked")     public static List<LinkedHashMap<String, Object>>  Getlistmap (String json)  {        if  ( Stringutils.isblank (JSON))             return  Null;        objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {             List<LinkedHashMap<String, Object>> list =  Om.readvalue (json, list.class);             return list;         } catch  (jsonparseexception e)  {             e.printstacktrace ();         } catch   (jsonmappingexception e)  {             e.printstacktrace ();        } catch  (IOException  e)  {            e.printstacktrace ();         }        return null;     }    /**     *  convert JSON data to List<map <String, T>>     *      *  @param  json     *  @return      */    public static <t > list<map<string, t>> getlistmap (string json, class<t>  Entityclass)  {        if  (Stringutils.isblank (JSON))              return null;         objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {            list <map<string, t>> list = om.readvalue (json, new typereference<list <Map<String, T>>> ()  {             });             return list;         } catch  (jsonparseexception e)  {             e.printstacktrace ();         }  catch  (jsonmappingexception e)  {             e.printstacktrace ();        } catch  ( Ioexception e)  {             E.printstacktrace ();        }         return null;    }    /**      *  convert JSON data to map<string, object>     *       *  @param  json     *  @return      */     @SuppressWarnings ("unchecked")     public static map<string, object> getmap (String json)  {        if  (Stringutils.isblank (JSON))              return null;         objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {            map<string,  object> map = om.readvalue (Json, map.class);             return map;        }  catch  (jsonparseexception e)  {            e.printstacktrace ();         } catch  (jsonmappingexception e)  {             e.printstacktrace ();         } catch  (ioexception e)  {             e.printstacktrace ();         }         return null;    }     /**     *  convert JSON data to map<string, t>      *      *  @param  json     *  @return      */    public static <t> map<string,  t> getmap (STRING&NBSp;json, class<t> entityclass)  {        if  ( Stringutils.isblank (JSON))             return  Null;        objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {             map<string, t> list = om.readvalue (json, new  Typereference<map<string, t>> ()  {             });            return list;         } catch  (jsonparseexception e)  {      &Nbsp;      e.printstacktrace ();         }  catch  (jsonmappingexception e)  {             e.printstacktrace ();        } catch  ( Ioexception e)  {             E.printstacktrace ();        }         return null;    }    /**      *  convert JSON data to a specified type      *      *  @param  json     *  @param  valuetype     * @ return     */    public static <t> t  GetObject (string json, class<t>&Nbsp;valuetype)  {        if  (Stringutils.isblank (JSON))             return null;         objectmapper om = new objectmapper ();         om.configure (Feature.fail_on_unknown_properties, false);         try {             return om.readvalue (Json, valuetype);        }  catch  (jsonparseexception e)  {             e.printstacktrace ();        } catch  ( Jsonmappingexception e)  {             E.printstacktrace ();         } catch  (ioexception e)  {             e.printstacktrace ();        }         return null;    }}

In Basecontrol, you can write a method like this.

    /**     *  Output HTML Script      */     protected void writejson (Httpservletresponse response, object obj)  {        this.writejson (response, obj,  "Utf-8");     }    /**     *  output HTML script with formatting       */    protected void writejson (HttpServletResponse  Response, object obj, string charset)  {         string json = jsonparse.getjson (obj);         Response.setcontenttype ("text/html;charset="  + charset);         response.setdateheader ("Expires",  -10);         printwriter  out = null;        try {             out = response.getwriter ();             OUT.PRINTLN (JSON);             Out.flush ();        } catch  (IOException e)  {             e.printstacktrace ();         } finally {             if  (out != null)                  out.close ();        }     }

When used, inherits Basecontrol, calls the Writejson method, and returns the JSON-formatted string to the foreground.

This.writejson (response, helloservice.getsomething (ID));