将json字符串转换为实体类对象

[b]1.将json字符串转换为实体类对象
[/b]
public static Object json2Obj(String json) {
try {
com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
Object entiy = mapper.readValue(json, Object.class);
return entiy;
} catch (com.fasterxml.jackson.core.JsonParseException e) {
e.printStackTrace();
} catch (com.fasterxml.jackson.databind.JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
2. 将List对象序列化为JSON文本

public static <T> String toJSONString(List<T> list) {
JSONArray jsonArray = JSONArray.fromObject(list);
return jsonArray.toString();
}

3.将对象序列化为JSON文本

public static String toJSONString(Object object) {
JSONArray jsonArray = JSONArray.fromObject(object);
return jsonArray.toString();
}

...

package com.yn.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.commons.beanutils.BeanUtils;

/**
* JSON工具类
*
* @author {lzyqssn} <2017年3月17日-上午5:20:00>
*/
public class JsonUtil {

/**
* 将json字符串转换为实体类对象
*
* @param json
* @return
*/
public static Object json2Obj(String json) {
try {
com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
Object entiy = mapper.readValue(json, Object.class);
return entiy;
} catch (com.fasterxml.jackson.core.JsonParseException e) {
e.printStackTrace();
} catch (com.fasterxml.jackson.databind.JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

/**
* 将List对象序列化为JSON文本
*/
public static <T> String toJSONString(List<T> list) {
JSONArray jsonArray = JSONArray.fromObject(list);

return jsonArray.toString();
}

/**
* 将对象序列化为JSON文本
*
* @param object
* @return
*/
public static String toJSONString(Object object) {
JSONArray jsonArray = JSONArray.fromObject(object);

return jsonArray.toString();
}

/**
* 将对象object转换为json字符串.
*
* @param object
* @return
*/
public static String obj2Json(Object object) {
try {
com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
String json = mapper.writeValueAsString(object);
return json;
} catch (com.fasterxml.jackson.core.JsonGenerationException e) {
e.printStackTrace();
} catch (com.fasterxml.jackson.databind.JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

/**
* 将JSON对象数组序列化为JSON文本
*
* @param jsonArray
* @return
*/
public static String toJSONString(JSONArray jsonArray) {
return jsonArray.toString();
}

/**
* 将JSON对象序列化为JSON文本
*
* @param jsonObject
* @return
*/
public static String toJSONString(JSONObject jsonObject) {
return jsonObject.toString();
}

/**
* 将对象转换为List对象
*
* @param object
* @return
*/
public static List toArrayList(Object object) {
List arrayList = new ArrayList();

JSONArray jsonArray = JSONArray.fromObject(object);

Iterator it = jsonArray.iterator();
while (it.hasNext()) {
JSONObject jsonObject = (JSONObject) it.next();

Iterator keys = jsonObject.keys();
while (keys.hasNext()) {
Object key = keys.next();
Object value = jsonObject.get(key);
arrayList.add(value);
}
}

return arrayList;
}

/**
* 将对象转换为Collection对象
*
* @param object
* @return
*/
public static Collection toCollection(Object object) {
JSONArray jsonArray = JSONArray.fromObject(object);

return JSONArray.toCollection(jsonArray);
}

/**
* 将对象转换为JSON对象数组
*
* @param object
* @return
*/
public static JSONArray toJSONArray(Object object) {
return JSONArray.fromObject(object);
}

/**
* 将对象转换为JSON对象
*
* @param object
* @return
*/
public static JSONObject toJSONObject(Object object) {
return JSONObject.fromObject(object);
}

/**
* 将对象转换为HashMap
*
* @param object
* @return
*/
public static HashMap toHashMap(Object object) {
HashMap<String, Object> data = new HashMap<String, Object>();
JSONObject jsonObject = JsonUtil.toJSONObject(object);
Iterator it = jsonObject.keys();
while (it.hasNext()) {
String key = String.valueOf(it.next());
Object value = jsonObject.get(key);
data.put(key, value);
}

return data;
}

/**
* 将对象转换为List>
*
* @param object
* @return
*/
// 返回非实体类型(Map)的List
public static List<Map<String, Object>> toList(Object object) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
JSONArray jsonArray = JSONArray.fromObject(object);
for (Object obj : jsonArray) {
JSONObject jsonObject = (JSONObject) obj;
Map<String, Object> map = new HashMap<String, Object>();
Iterator it = jsonObject.keys();
while (it.hasNext()) {
String key = (String) it.next();
Object value = jsonObject.get(key);
map.put((String) key, value);
}
list.add(map);
}
return list;
}

/**
* 将JSON对象数组转换为传入类型的List
*
* @param
* @param jsonArray
* @param objectClass
* @return
*/
public static <T> List<T> toList(JSONArray jsonArray, Class<T> objectClass) {
return JSONArray.toList(jsonArray, objectClass);
}

/**
* 将对象转换为传入类型的List
*
* @param
* @param jsonArray
* @param objectClass
* @return
*/
public static <T> List<T> toList(Object object, Class<T> objectClass) {
JSONArray jsonArray = JSONArray.fromObject(object);

return JSONArray.toList(jsonArray, objectClass);
}

}