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JAVA反射機制，把JavaBean屬性轉成字符串

package com.jetsum.util;

import java.io.StringReader;

import java.lang.reflect.Field;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Set;

import antlr.RecognitionException;

import antlr.TokenStreamException;

import com.sdicons.json.mapper.JSONMapper;

import com.sdicons.json.mapper.MapperException;

import com.sdicons.json.model.JSONArray;

import com.sdicons.json.model.JSONValue;

import com.sdicons.json.parser.JSONParser;

public class JsonUtil {

/**

* JAVA對象轉換成JSON字符串

* @param obj

* @return

* @throws MapperException

*/

public static String objectToJsonStr(Object obj) throws MapperException{

JSONValue jsonValue = JSONMapper.toJSON(obj);

String jsonStr = jsonValue.render(false);

return jsonStr;

}

/**

* 重載objectToJsonStr方法

* @param obj 需要轉換的JAVA對象

* @param format 是否格式化

* @return

* @throws MapperException

*/

public static String objectToJsonStr(Object obj,boolean format) throws MapperException{

JSONValue jsonValue = JSONMapper.toJSON(obj);

String jsonStr = jsonValue.render(format);

return jsonStr;

}

/**

* JSON字符串轉換成JAVA對象

* @param jsonStr

* @param cla

* @return

* @throws MapperException

* @throws TokenStreamException

* @throws RecognitionException

*/

@SuppressWarnings({ "rawtypes", "unchecked" })

public static Object jsonStrToObject(String jsonStr,Class<?> cla) throws MapperException, TokenStreamException, RecognitionException{

Object obj = null;

try{

JSONParser parser = new JSONParser(new StringReader(jsonStr));

JSONValue jsonValue = parser.nextValue();

if(jsonValue instanceof com.sdicons.json.model.JSONArray){

List list = new ArrayList();

JSONArray jsonArray = (JSONArray) jsonValue;

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

JSONValue jsonObj = jsonArray.get(i);

Object javaObj = JSONMapper.toJava(jsonObj,cla);

list.add(javaObj);

}

obj = list;

}else if(jsonValue instanceof com.sdicons.json.model.JSONObject){

obj = JSONMapper.toJava(jsonValue,cla);

}else{

obj = jsonValue;

}

}catch(Exception e){

e.printStackTrace();

}

return obj;

}

/**

* 將JAVA對象轉換成JSON字符串

* @param obj

* @return

* @throws IllegalArgumentException

* @throws IllegalAccessException

*/

@SuppressWarnings("rawtypes")

public static String simpleObjectToJsonStr(Object obj,List<Class> claList) throws IllegalArgumentException, IllegalAccessException{

if(obj==null){

return "null";

}

String jsonStr = "{";

Class<?> cla = obj.getClass();

Field fields[] = cla.getDeclaredFields();

for (Field field : fields) {

field.setAccessible(true);

if(field.getType() == long.class){

jsonStr += "\""+field.getName()+"\":"+field.getLong(obj)+",";

}else if(field.getType() == double.class){

jsonStr += "\""+field.getName()+"\":"+field.getDouble(obj)+",";

}else if(field.getType() == float.class){

jsonStr += "\""+field.getName()+"\":"+field.getFloat(obj)+",";

}else if(field.getType() == int.class){

jsonStr += "\""+field.getName()+"\":"+field.getInt(obj)+",";

}else if(field.getType() == boolean.class){

jsonStr += "\""+field.getName()+"\":"+field.getBoolean(obj)+",";

}else if(field.getType() == Integer.class||field.getType() == Boolean.class

||field.getType() == Double.class||field.getType() == Float.class

||field.getType() == Long.class){

jsonStr += "\""+field.getName()+"\":"+field.get(obj)+",";

}else if(field.getType() == String.class){

jsonStr += "\""+field.getName()+"\":\""+field.get(obj)+"\",";

}else if(field.getType() == List.class){

String value = simpleListToJsonStr((List<?>)field.get(obj),claList);

jsonStr += "\""+field.getName()+"\":"+value+",";

}else{

if(claList!=null&&claList.size()!=0&&claList.contains(field.getType())){

String value = simpleObjectToJsonStr(field.get(obj),claList);

jsonStr += "\""+field.getName()+"\":"+value+",";

}else{

jsonStr += "\""+field.getName()+"\":null,";

}

jsonStr = jsonStr.substring(0,jsonStr.length()-1);

jsonStr += "}";

return jsonStr;

}

/**

* 將JAVA的LIST轉換成JSON字符串

* @param list

* @return

* @throws IllegalArgumentException

* @throws IllegalAccessException

*/

@SuppressWarnings("rawtypes")

public static String simpleListToJsonStr(List<?> list,List<Class> claList) throws IllegalArgumentException, IllegalAccessException{

if(list==null||list.size()==0){

return "[]";

}

String jsonStr = "[";

for (Object object : list) {

jsonStr += simpleObjectToJsonStr(object,claList)+",";

}

jsonStr = jsonStr.substring(0,jsonStr.length()-1);

jsonStr += "]";

return jsonStr;

}

/**

* 將JAVA的MAP轉換成JSON字符串，

* 只轉換第一層數據

* @param map

* @return

*/

public static String simpleMapToJsonStr(Map<?,?> map){

if(map==null||map.isEmpty()){

return "null";

}

String jsonStr = "{";

Set<?> keySet = map.keySet();

for (Object key : keySet) {

jsonStr += "\""+key+"\":\""+map.get(key)+"\",";

}

jsonStr = jsonStr.substring(0,jsonStr.length()-1);

jsonStr += "}";

return jsonStr;

}

文章詳細參考:http://blog.csdn.net/sjiang2142/article/details/6770672

歡迎大家訪問我的個人網站萌萌的IT人

posted on 2014-07-22 15:14 一堣而安閱讀(3928) 評論(0) 編輯收藏所屬分類: java

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