package com.huarun.project.utils; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import com.fasterxml.jackson.core.JsonParser.Feature; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.common.collect.Maps; /*** * List 转 json * * @author Administrator * */ public class JsonMapper extends ObjectMapper{ private static final long serialVersionUID = 1L; private static JsonMapper mapper; /** * 允许单引号 * 允许不带引号的字段名称 */ public JsonMapper enableSimple() { this.configure(Feature.ALLOW_SINGLE_QUOTES, true); this.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true); return this; } public static JsonMapper getInstance() { if (mapper == null){ mapper = new JsonMapper().enableSimple(); } return mapper; } /*** * 如果对象为Null,返回"null". 如果集合为空集合,返回"[]". * * @param object * @return */ public String toJson(Object object) { try { return this.writeValueAsString(object); } catch (IOException e) { return null; } } /** * 测试 list 转 json */ public static void main(String[] args) { List<Map<String, Object>> list = new ArrayList<>(); Map<String, Object> map = new HashMap<>(); map.put("id", 1); map.put("pId", -1); map.put("name", "根节点"); list.add(map); map = Maps.newHashMap(); map.put("id", 2); map.put("pId", 1); map.put("name", "你好"); map.put("open", true); list.add(map); Map<String, Object> map3 = new HashMap<>(); map3.put("A1", 5); map3.put("B1", 5); map3.put("C1", 5); list.add(map3); //方法1 String json = JsonMapper.getInstance().toJson(list); System.out.println(json); //方法2 JSONArray subMsgs = JSONArray.fromObject(list); System.out.println(subMsgs); //JSONObject 测试 JSONObject jsono = new JSONObject(); jsono.put("age", "888"); jsono.putAll(map); System.out.println(jsono); //Map 接收 Map<String,Object> strmap=new JSONObject(); strmap.put("group", "员工"); strmap.put("from", "深圳"); strmap.put("id", 33); System.out.println(strmap); //json 字符串 转 json 对象 JSONObject json1 = JSONObject.fromObject(json); System.out.println(json1); } }
List 转 json
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转载自keney-oak.iteye.com/blog/2309834
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