package util.json;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
@SuppressWarnings("all")
public class FastJsonUtil {
private static final Logger logger = LoggerFactory
.getLogger(FastJsonUtil.class);
public static final <T> List<T> getList(String jsontext,String list_str,Class<T> clazz) {
JSONObject jsonobj = JSON.parSEObject(jsontext);
if (jsonobj == null) {
return null;
}
Object obj = jsonobj.get(list_str);
if (obj == null) {
return null;
}
// if(obj instanceof JSONObject){}
if (obj instanceof JSONArray) {
JSONArray jsonarr = (JSONArray) obj;
List<T> list = new ArrayList<T>();
for (int i = 0; i < jsonarr.size(); i++) {
list.add(jsonarr.getObject(i,clazz));
}
return list;
}
return null;
}
/**
* @param <T>
* -> DepartmentBean
* @param jsontext
* -> {"department":{"id":"1","name":"生产部"},"password":"admin",* "username":"admin"}
* @param obj_str
* -> department
* @param clazz
* -> DepartmentBean
* @return -> T
*/
public static final <T> T getObject(String jsontext,String obj_str,Class<T> clazz) {
JSONObject jsonobj = JSON.parSEObject(jsontext);
if (jsonobj == null) {
return null;
}
Object obj = jsonobj.get(obj_str);
if (obj == null) {
return null;
}
if (obj instanceof JSONObject) {
return jsonobj.getObject(obj_str,clazz);
} else {
logger.info(obj.getClass()+"");
}
return null;
}
/**
* @param <T>
* @param jsontext
* ->{"department":{"id":"1",* "username":"admin"}
* @param clazz
* -> UserBean.class
* @return -> UserBean
*/
// 注:传入任意的jsontext,返回的T都不会为null,只是T的属性为null
public static final <T> T getObject(String jsontext,Class<T> clazz) {
T t = null;
try {
t = JSON.parSEObject(jsontext,clazz);
} catch (Exception e) {
logger.error("json字符串转换失败!" + jsontext,e);
}
return t;
}
public static final String toJSONString(Object object,boolean prettyFormat) {
return JSON.toJSONString(object,prettyFormat);
}
/**
* @Description: json字符串转成为List
* @author: GuXiYang
* @date: 2017/05/08 10:25:00
* @param jsonStr
* json字符串
* @param clazz
* class名称
* @return
*/
public static <T> List<T> getList(String jsonStr,Class<T> clazz) {
List<T> list = new ArrayList<T>();
try {
list = JSON.parseArray(jsonStr,clazz);
} catch (Exception e) {
logger.error("json字符串转List失败!" + jsonStr,e);
}
return list;
}
/**
*
* @Description: json字符串转换成list<Map>
* @author: GuXiYang
* @date: 2017/05/08 10:27:16
* @param jsonString
* json字符串
* @return
*/
public static List<Map<String,Object>> listKeyMaps(String jsonString) {
List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
try {
list = JSON.parSEObject(jsonString,new TypeReference<List<Map<String,Object>>>() {
});
} catch (Exception e) {
logger.error("json字符串转map失败",e);
}
return list;
}
/**
* @Description: json字符串转换为Map
* @author: GuXiYang
* @date: 2017/05/08 10:32:33
* @param jsonStr
* json字符串
* @return
*/
public static Map<String,Object> json2Map(String jsonStr) {
try {
return JSON.parSEObject(jsonStr,Map.class);
} catch (Exception e) {
logger.error("json字符串转换失败!" + jsonStr,e);
}
return null;
}
// public static void main(String[] args) {
// Map<String,Object> dataMap = new HashMap<String,Object>();
// dataMap.put("tag","data");
// dataMap.put("hospitalName","宜都市妇幼保健院");
// dataMap.put("name","欧阳夏凡");
// dataMap.put("gender","女");
// dataMap.put("age","28");
// dataMap.put("code","420502042");
// dataMap.put("examineDoc","杨林");
// dataMap.put("examineDate","2016-05-10");
// dataMap.put("verifyDoc","王菲");
// String jsonString=JSON.toJSONString(dataMap);
// System.out.println(jsonString);
// Map object = getObject(jsonString,Map.class);
// System.out.println(object.get("age"));
// }
}
package org.ph.system.utils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* Created by phshy on 2017/1/19.
*/
public class JSONUtils {
private static final ObjectMapper mapper = new ObjectMapper();
private JSONUtils() {
}
public static Map<String,Object> json2Map(String json) throws IOException {
Map map = (Map) mapper.readValue(json,Map.class);
return map;
}
public static String object2Json(Object object) throws IOException {
return mapper.writeValueAsString(object);
}
public static <T> T json2Object(String json,Class<T> clazz) throws IOException {
return mapper.readValue(json,clazz);
}
public static List<?> json2List(String json,TypeReference<?> typeRef) throws IOException {
List list = (List) mapper.readValue(json,typeRef);
return list;
}
public static void main(String[] args) throws IOException {
List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
Map<String,Object>();
dataMap.put("tag","data");
dataMap.put("hospitalName","宜都市妇幼保健院");
dataMap.put("name","欧阳夏凡");
dataMap.put("gender","女");
dataMap.put("age","28");
dataMap.put("code","420502042");
dataMap.put("examineDoc","杨林");
dataMap.put("examineDate","2016-05-10");
dataMap.put("verifyDoc","王菲");
Map<String,Object> dataMap2 = new HashMap<String,Object>();
dataMap2.put("no","340812");
dataMap2.put("name","古夕旸");
//
String jsonString=JSON.toJSONString(dataMap);
list.add(dataMap);
list.add(dataMap2);
// String jsonString2=mapper.writeValueAsString(list);
String jsonString2=JSON.toJSONString(list);
System.out.println(jsonString2);
List<Map<String,Object>> json2List = (List<Map<String,Object>>) json2List(jsonString2,Object>>>(){});
for (Map<String,Object> s:json2List) {
System.out.println(s.get("name"));
}
}
}
原文链接:https://www.f2er.com/json/288927.html