Json与javaBean之间的转换工具类
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
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 晚风工作室 www.soservers.com * @version 20111221 * * {@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")
public static <T> T jsonToBean(String jsonString, Class<T> beanCalss) {
JSONObject jsonObject = JSONObject.fromObject(jsonString);
T bean = (T) JSONObject.toBean(jsonObject, beanCalss);
return bean;
}
/** * 将java对象转换成json字符串 * * @param bean * @return */
public static String beanToJson(Object bean) {
JSONObject json = JSONObject.fromObject(bean);
return json.toString();
}
/** * 将java对象转换成json字符串 * * @param bean * @return */
public static 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));
}
return json.toString();
}
private static 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));
return jsonConfig;
}
/** * 将java对象List集合转换成json字符串 * @param beans * @return */
@SuppressWarnings("unchecked")
public static String beanListToJson(List beans) {
StringBuffer rest = new StringBuffer();
rest.append("[");
int size = beans.size();
for (int i = 0; i < size; i++) {
rest.append(beanToJson(beans.get(i))+((i<size-1)?",":""));
}
rest.append("]");
return rest.toString();
}
/** * * @param beans * @param _no_changes * @return */
@SuppressWarnings("unchecked")
public static String beanListToJson(List beans, String[] _nory_changes, boolean nory) {
StringBuffer rest = new StringBuffer();
rest.append("[");
int size = 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("]");
return rest.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" })
public static 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);
}
return valueMap;
}
/** * map集合转换成json格式数据 * @param map * @return */
public static 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){
}else if(map.get(s) instanceof List<?>){
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+="}";
return s_json;
}
/** * 从json数组中得到相应java数组 * * @param jsonString * @return */
public static Object[] jsonToObjectArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
return jsonArray.toArray();
}
public static String listToJson(List<?> list) {
JSONArray jsonArray = JSONArray.fromObject(list);
return jsonArray.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")
public static <T> List<T> jsonToBeanList(String jsonString, Class<T> beanClass) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
JSONObject jsonObject;
T bean;
int size = 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);
}
return list;
}
/** * 从json数组中解析出java字符串数组 * * @param jsonString * @return */
public static String[] jsonToStringArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
String[] stringArray = new String[jsonArray.size()];
int size = jsonArray.size();
for (int i = 0; i < size; i++) {
stringArray[i] = jsonArray.getString(i);
}
return stringArray;
}
/** * 从json数组中解析出javaLong型对象数组 * * @param jsonString * @return */
public static Long[] jsonToLongArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
int size = jsonArray.size();
Long[] longArray = new Long[size];
for (int i = 0; i < size; i++) {
longArray[i] = jsonArray.getLong(i);
}
return longArray;
}
/** * 从json数组中解析出java Integer型对象数组 * * @param jsonString * @return */
public static Integer[] jsonToIntegerArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
int size = jsonArray.size();
Integer[] integerArray = new Integer[size];
for (int i = 0; i < size; i++) {
integerArray[i] = jsonArray.getInt(i);
}
return integerArray;
}
/** * 从json数组中解析出java Double型对象数组 * * @param jsonString * @return */
public static Double[] jsonToDoubleArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
int size = jsonArray.size();
Double[] doubleArray = new Double[size];
for (int i = 0; i < size; i++) {
doubleArray[i] = jsonArray.getDouble(i);
}
return doubleArray;
}
}