实例如下所示：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import io.swagger.models.auth.In; import java.io.IOException; import java.security.KeyManagementException; import java.security.NoSuchAlgorithmException; import java.util.Iterator; /** * Created by Administrator on 2017/4/21. */ public class test { public static void main(String[] args) throws Exception { //第一种格式 /** * [ { "data ": [ { "building_id ": "*** ", "building_num ": "** ", "door_name ": "** ", "electric ": "** ", "room_name ": "** " } ], "success ": true } ] */ String s="[{\"success\":true,\"data\":[{\"building_id\":\"***\",\"building_num\":\"**\",\"room_name\":\"**\",\"door_name\":\"**\",\"electric\":\"**\"}]}]" ; String b= s.substring(0,s.length()-1); String c=b.substring(1, b.length()); System.out.println(b+"b___"); JSONObject jsonx = JSON.parseObject(c); JSONArray ja = jsonx.getJSONArray("data"); for (int i = 0; i < ja.size(); i++) { JSONObject jo = ja.getJSONObject(i); String building_id = jo.getString("building_id"); System.out.println(building_id+"building_id>>>>>"); } //第二种格式 /** * [ { "password ": "*1234567890 ", "success ": "true " } ] */ String s="[{\"success\":\"true\",\"password\":\"*1234567890\"}]"; String b= s.substring(0,s.length()-1); String c=b.substring(1, b.length()); System.out.println(c+"c___"); JSONObject reagobj = JSONObject.fromObject(c); String name = reagobj.getString("password"); System.out.println(name+"name,,,,,,"); String password = jm.getString("password"); System.out.println(password); System.out.println("看看有没有值"+password); //第三种格式 /** * { "data ": { "access_token ": "5a7040ccf66bafd06acd39b6f61c19230eaba426755509646d6da23ddd9fb206 ", "expires_second ": 36000 }, "rlt_code ": "HH0000 ", "rlt_msg ": "成功 " } */ String res="{\"data\":{\"access_token\":\"5a7040ccf66bafd06acd39b6f61c19230eaba426755509646d6da23ddd9fb206\",\"expires_second\":36000},\"rlt_code\":\"HH0000\",\"rlt_msg\":\"成功\"}"; JSONObject jsonObject= JSON.parseObject(res); String data = jsonObject.getString("data"); JSONObject jsondata= JSON.parseObject(data); String token = jsondata.getString("access_token"); //第四种格式 /** * { "data ": { "total ":23, "start ":0, "total_page ":3, "rows ": [ { "op_way ": "3 ", "user_mobile ": "15321918571 ", "op_time ":1493881391976, "pwd_no ":30}, { "op_way ": "1 ", "op_time ":1493880995000, "pwd_no ":31} ], "current_page ":1, "page_size ":10 }, "rlt_code ": "HH0000 ", "rlt_msg ": "成功 " } */ String res="{\"data\":{\"total\":23,\"start\":0,\"total_page\":3,\"rows\":[{\"op_way\":\"1\",\"op_time\":1493884964000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"18518517491\",\"op_time\":1493884615032,\"pwd_no\":30},{\"op_way\":\"3\",\"user_mobile\":\"18518517491\",\"op_time\":1493883836552,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493883294000,\"pwd_no\":31},{\"op_way\":\"1\",\"op_time\":1493883256000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493883015371,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493882007000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493881498520,\"pwd_no\":30},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493881391976,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493880995000,\"pwd_no\":31}],\"current_page\":1,\"page_size\":10},\"rlt_code\":\"HH0000\",\"rlt_msg\":\"成功\"}"; JSONObject jsonObject= JSON.parseObject(res); String data = jsonObject.getString("data"); JSONObject jsonObjects= JSON.parseObject(data); JSONArray ja = jsonObjects.getJSONArray("rows"); for (int i = 0; i < ja.size(); i++) { JSONObject jo = ja.getJSONObject(i); String op_way = jo.getString("op_way"); String op_time = jo.getString("op_time"); SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); long lt = new Long(op_time); Date date = new Date(lt); res = simpleDateFormat.format(date); String pwd_no = jo.getString("pwd_no"); String user_mobile = jo.getString("user_mobile"); System.out.println(op_way+res+pwd_no+user_mobile+"------------"); } } }

以上这篇java的JsonObject对象提取值方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/qq_37581708/article/details/72367803