Json与javaBean之间的转换工具类

Json与javaBean之间的转换工具类

















import java.lang.reflect.Field;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

 

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import net.sf.json.JsonConfig;

 

/**

 * Json与javaBean之间的转换工具类

 *

 * @author Alex

 * @version 20160409

 *

 * {@code   现使用json-lib组件实现

 *          需要

 *              json-lib-2.4-jdk15.jar

 *              ezmorph-1.0.6.jar

 *              commons-collections-3.1.jar

 *              commons-lang-2.0.jar

 *          支持

 * }

 */

public class JsonPluginsUtil {

 

 

    /** 

     * 从一个JSON 对象字符格式中得到一个java对象 

     *  

     * @param jsonString 

     * @param beanCalss 

     * @return 

     */

    @SuppressWarnings("unchecked")

    publicstatic <T> T jsonToBean(String jsonString, Class<T> beanCalss) {

         

        JSONObject jsonObject = JSONObject.fromObject(jsonString);

        T bean = (T) JSONObject.toBean(jsonObject, beanCalss);

         

        returnbean;

         

    }

 

    /** 

     * 将java对象转换成json字符串 

     *

     * @param bean 

     * @return 

     */

    publicstatic String beanToJson(Object bean) {

 

        JSONObject json = JSONObject.fromObject(bean);

         

        returnjson.toString();

 

    }

     

    /** 

     * 将java对象转换成json字符串 

     *

     * @param bean 

     * @return 

     */

    publicstatic String beanToJson(Object bean, String[] _nory_changes,boolean nory) {

 

        JSONObject json =null;

         

        if(nory){//转换_nory_changes里的属性

             

            Field[] fields = bean.getClass().getDeclaredFields();

            String str ="";

            for(Field field : fields){

//              System.out.println(field.getName());

                str+=(":"+field.getName());

            }

            fields = bean.getClass().getSuperclass().getDeclaredFields();

            for(Field field : fields){

//              System.out.println(field.getName());

                str+=(":"+field.getName());

            }

            str+=":";

            for(String s : _nory_changes){

                str = str.replace(":"+s+":",":");

            }

            json = JSONObject.fromObject(bean,configJson(str.split(":")));

             

        }else{//转换除了_nory_changes里的属性

             

 

             

            json = JSONObject.fromObject(bean,configJson(_nory_changes));

        }

         

         

         

        returnjson.toString();

 

    }

     privatestatic JsonConfig configJson(String[] excludes) {  

 

                JsonConfig jsonConfig =new JsonConfig();  

 

                jsonConfig.setExcludes(excludes);  

//

                jsonConfig.setIgnoreDefaultExcludes(false);  

//

//              jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);  

 

//              jsonConfig.registerJsonValueProcessor(Date.class,  

//

//                  new DateJsonValueProcessor(datePattern));  

 

               

 

                returnjsonConfig;  

 

            } 

 

 

 

 

 

    /**

     * 将java对象List集合转换成json字符串 

     * @param beans

     * @return

     */

    @SuppressWarnings("unchecked")

    publicstatic String beanListToJson(List beans) {

         

        StringBuffer rest =new StringBuffer();

         

        rest.append("[");

         

        intsize = beans.size();

         

        for(int i = 0; i < size; i++) {

             

            rest.append(beanToJson(beans.get(i))+((i<size-1)?",":""));

 

        }

         

        rest.append("]");

         

        returnrest.toString();

 

    }

     

    /**

     *

     * @param beans

     * @param _no_changes

     * @return

     */

    @SuppressWarnings("unchecked")

    publicstatic String beanListToJson(List beans, String[] _nory_changes,boolean nory) {

         

        StringBuffer rest =new StringBuffer();

         

        rest.append("[");

         

        intsize = beans.size();

         

        for(int i = 0; i < size; i++) {

            try{

                rest.append(beanToJson(beans.get(i),_nory_changes,nory));

                if(i<size-1){

                    rest.append(",");

                }

            }catch(Exception e){

                e.printStackTrace();

            }

        }

         

        rest.append("]");

         

        returnrest.toString();

 

    }

 

    /** 

     * 从json HASH表达式中获取一个map，改map支持嵌套功能 

     *

     * @param jsonString 

     * @return 

     */

    @SuppressWarnings({"unchecked" })

    publicstatic Map jsonToMap(String jsonString) {

         

        JSONObject jsonObject = JSONObject.fromObject(jsonString);

        Iterator keyIter = jsonObject.keys();

        String key;

        Object value;

        Map valueMap =new HashMap();

 

        while(keyIter.hasNext()) {

             

            key = (String) keyIter.next();

            value = jsonObject.get(key).toString();

            valueMap.put(key, value);

             

        }

 

        returnvalueMap;

    }

     

    /**

     * map集合转换成json格式数据

     * @param map

     * @return

     */

    publicstatic String mapToJson(Map<String, ?> map, String[] _nory_changes,boolean nory){

         

        String s_json ="{";

         

         Set<String> key = map.keySet();

         for(Iterator<?> it = key.iterator(); it.hasNext();) {

             String s = (String) it.next();

             if(map.get(s) ==null){

                  

             }elseif(map.get(s) instanceofList<?>){

                 s_json+=(s+":"+JsonPluginsUtil.beanListToJson((List<?>)map.get(s), _nory_changes, nory));

                 

             }else{

                 JSONObject json = JSONObject.fromObject(map);

                 s_json += (s+":"+json.toString());;

             }

              

             if(it.hasNext()){

                 s_json+=",";

             }

        }

 

         s_json+="}";

        returns_json;

    }

 

    /** 

     * 从json数组中得到相应java数组 

     *

     * @param jsonString 

     * @return 

     */

    publicstatic Object[] jsonToObjectArray(String jsonString) {

         

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

         

        returnjsonArray.toArray();

 

    }

     

    publicstatic String listToJson(List<?> list) {

         

        JSONArray jsonArray = JSONArray.fromObject(list);

         

        returnjsonArray.toString();

 

    }

 

    /** 

     * 从json对象集合表达式中得到一个java对象列表 

     *

     * @param jsonString 

     * @param beanClass 

     * @return 

     */

    @SuppressWarnings("unchecked")

    publicstatic <T> List<T> jsonToBeanList(String jsonString, Class<T> beanClass) {

 

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        JSONObject jsonObject;

        T bean;

        intsize = jsonArray.size();

        List<T> list =new ArrayList<T>(size);

 

        for(int i = 0; i < size; i++) {

 

            jsonObject = jsonArray.getJSONObject(i);

            bean = (T) JSONObject.toBean(jsonObject, beanClass);

            list.add(bean);

 

        }

         

        returnlist;

 

    }

 

    /** 

     * 从json数组中解析出java字符串数组 

     *

     * @param jsonString 

     * @return 

     */

    publicstatic String[] jsonToStringArray(String jsonString) {

 

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        String[] stringArray =new String[jsonArray.size()];

        intsize = jsonArray.size();

 

        for(int i = 0; i < size; i++) {

 

            stringArray[i] = jsonArray.getString(i);

 

        }

 

        returnstringArray;

    }

 

    /** 

     * 从json数组中解析出javaLong型对象数组 

     *

     * @param jsonString 

     * @return 

     */

    publicstatic Long[] jsonToLongArray(String jsonString) {

 

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        intsize = jsonArray.size();

        Long[] longArray =new Long[size];

         

        for(int i = 0; i < size; i++) {

             

            longArray[i] = jsonArray.getLong(i);

 

        }

         

        returnlongArray;

         

    }

 

    /** 

     * 从json数组中解析出java Integer型对象数组 

     *

     * @param jsonString 

     * @return 

     */

    publicstatic Integer[] jsonToIntegerArray(String jsonString) {

 

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        intsize = jsonArray.size();

        Integer[] integerArray =new Integer[size];

         

        for(int i = 0; i < size; i++) {

             

            integerArray[i] = jsonArray.getInt(i);

 

        }

         

        returnintegerArray;

         

    }

 

    /** 

     * 从json数组中解析出java Double型对象数组 

     *

     * @param jsonString 

     * @return 

     */

    publicstatic Double[] jsonToDoubleArray(String jsonString) {

 

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        intsize = jsonArray.size();

        Double[] doubleArray =new Double[size];

         

        for(int i = 0; i < size; i++) {

             

            doubleArray[i] = jsonArray.getDouble(i);

 

        }

         

        returndoubleArray;

         

    }

 

}