Json转换利器Gson之-实际开发中的特殊需求处理(手动解析-TypeToken处理)

下面是开发中遇到的复杂JSON，用TypeToken来进行处理：（当然还有第二种解析方式，请查看http://blog.csdn.net/jason_996/article/details/78039799）

处理方法：

1，先将接口返回的JSON，用gson.tojson(map)方法，将LinkedTreeMap对象转成String。

2，再通过gson.fromjson(string,type)方法，将String转成LinkedTreeMap。用到了Type type=new TypeToken(){}.getType;

3，再将LinkedTreeMapf进行遍历

下面直接上代码：（例子中的数据内容与demo不一样，但数据 结构是一样的，为了不让公司的信息你懂得）

 private String jsonString = "{\"Members\":{\"Owner\":{\"ID\":\"26\",\"LoginName\":\"gm1\",\"Name\":\"总经理A\",\"Email\":\"[email protected]\"},\"Host\":{\"ID\":\"29\",\"LoginName\":\"gm3\",\"Name\":\"总经理C\",\"Email\":\"\"},\"Recorder\":{\"ID\":\"26\",\"LoginName\":\"gm1\",\"Name\":\"总经理A\",\"Email\":\"[email protected]\"},\"Members\":[{\"ID\":\"26\",\"LoginName\":\"gm1\",\"Name\":\"总经理A\",\"Email\":\"[email protected]\"},{\"ID\":\"28\",\"LoginName\":\"gm2\",\"Name\":\"总经理B\",\"Email\":\"[email protected]\"},{\"ID\":\"29\",\"LoginName\":\"gm3\",\"Name\":\"总经理C\",\"Email\":\"\"}],\"Attendance\":[{\"ID\":\"29\",\"LoginName\":\"gm3\",\"Name\":\"总经理C\",\"Email\":\"\"}],\"Absence\":[{\"LoginName\":\"gm1\",\"Name\":\"总经理A\",\"Email\":\"[email protected]\"},{\"LoginName\":\"gm2\",\"Name\":\"总经理B\",\"Email\":\"[email protected]\"}]},\"Room\":{\"MeetingID\":\"6fa7eef5-6735-4fb1-a992-8088250be948\",\"MeetingRoomID\":\"2ebbe73b-bee4-4a9e-81c9-f8ffc6ca1149\",\"Address\":\"金融港-302会议室\",\"Date\":\"2017-09-14\",\"Text\":\"2017-09-14 14:00-15:00\",\"Value\":\"[14:00][14:30]\"},\"Attachments\":{\"Items\":[{\"Actor\":\"总经理A\",\"File\":\"1503808491.zip\",\"Url\":\"http://aaa.com/tory/MeetAttents/808491.zip\",\"Time\":\"2017-09-14 15:23\"}]},\"ID\":\"6fa7eef5-735-4f1-a992-8088250be948\",\"Type\":\"专题协调会议\",\"Title\":\"就像在8888\",\"Address\":\"金融港-302会议室\",\"Time\":\"2017-09-14 14:00-15:00\",\"Note\":\"好想到你 \",\"Status\":\"已结束\",\"Author\":\"总经理A\",\"CreatedTime\":\"2017-09-14 14:48\",\"QrCode\":\"eyJ0eXBlIjozLCJpZCI6IjZmYThOTkyLTgwODgCx5YOP5ZyoODg4OCJ9\",\"Action\":\"[VIEW][RECORDER]\"}";
    

解析代码：（只做了json不同级的数据结构解析，剩下的可以自行在学习过程中去完成）

private void parseJson() {

        String parseString = "解析：\n";
        //GsonBuilder().enableComplexMapKeySerialization().create() 处理Map的key为复杂对象
        Gson gson = new GsonBuilder().enableComplexMapKeySerialization().create();
        Type type = new TypeToken>() {
        }.getType();
        LinkedTreeMap linkedTreeMap = gson.fromJson(jsonString, type);
        for (String str : linkedTreeMap.keySet()) {//一级
            if (str.equals("Action")) {
                String actionStr = (String) linkedTreeMap.get(str);
                parseString += "Action:" + actionStr + "\n";
            } else if (str.equals("Address")) {
                String addressStr = (String) linkedTreeMap.get(str);
                parseString += "Address:" + addressStr + "\n";
            } else if (str.equals("Author")) {
                String authorStr = (String) linkedTreeMap.get(str);
                parseString += "Author:" + authorStr + "\n";
            } else if (str.equals("CreatedTime")) {
                String createdTimeStr = (String) linkedTreeMap.get(str);
                parseString += "CreatedTime:" + createdTimeStr + "\n";
            } else if (str.equals("ID")) {
                String iDStr = (String) linkedTreeMap.get(str);
                parseString += "ID:" + iDStr + "\n";
            } else if (str.equals("Title")) {
                String titleStr = (String) linkedTreeMap.get(str);
                parseString += "Title:" + titleStr + "\n";
            } else if (str.equals("Type")) {
                String typeStr = (String) linkedTreeMap.get(str);
                parseString += "Type:" + typeStr + "\n";
            } else if (str.equals("Status")) {
                String statusStr = (String) linkedTreeMap.get(str);
                parseString += "Status:" + statusStr + "\n";
            } else if (str.equals("QrCode")) {
                String qrCodeStr = (String) linkedTreeMap.get(str);
                parseString += "QrCode:" + qrCodeStr + "\n";
            } else if (str.equals("Attachments")) {//二级
                //1.获到LinkedTreeMap>
                LinkedTreeMap> attachmentsStr = (LinkedTreeMap>) linkedTreeMap.get(str);
                //2.将LinkedTreeMap转成String
                String attachmentsJson = gson.toJson(attachmentsStr);
                Type type1 = new TypeToken>>() {
                }.getType();
                //3.再将String转成LinkedTreeMap>
                //为什么不能直接用上面1.LinkedTreeMap，因为它无法直接转化list里面的对象为AttachmentsItemBean
                com.google.gson.internal.LinkedTreeMap> attachments = gson.fromJson(attachmentsJson, type1);
                for (String attachmentsKey : attachments.keySet()) {
                    List attachmentsItemBeenList = attachments.get(attachmentsKey);
                    for (int i = 0; i < attachmentsItemBeenList.size(); i++) {
                        AttachmentsItemBean attachmentsItemBean = attachmentsItemBeenList.get(i);
                        String actor = attachmentsItemBean.getActor();
                        String file = attachmentsItemBean.getFile();
                        String url = attachmentsItemBean.getUrl();
                        parseString += "\t\t\t--items:" + "actor:" + actor + "\n"
                                + "\t\t\t--file:" + file + "\n"
                                + "\t\t\t--url:" + url + "\n";
                    }
                }

            } else if (str.equals("Members")) {//三级
                //1.获到LinkedTreeMap
                LinkedTreeMap LinkedTreeMapMember_s = (LinkedTreeMap) linkedTreeMap.get(str);
                //2.将LinkedTreeMap转成String
                String membersStr = gson.toJson(LinkedTreeMapMember_s);
                //TypeToken类型转换
                Type type2 = new TypeToken>() {
                }.getType();
                //3.再将String转成LinkedTreeMap
                //为什么不能直接用上面1.LinkedTreeMap，因为它无法直接转化list里面的对象为AttachmentsItemBean
                com.google.gson.internal.LinkedTreeMap LinkedTreeMapMembers = gson.fromJson(membersStr, type2);
                for (String membersKey : LinkedTreeMapMembers.keySet()) {
                    if (membersKey.equals("Host")) {
                        LinkedTreeMap host = (LinkedTreeMap) LinkedTreeMapMembers.get(membersKey);
                        String hostJson = gson.toJson(host);
                        LinkedTreeMap hostBean = gson.fromJson(hostJson, new TypeToken>() {
                        }.getType());
                        for (String hoststr : hostBean.keySet()) {
                            String hostValue = hostBean.get(hoststr);
                            parseString += "\t\t\t----Host----" + hoststr + ":" + hostValue + "\n";
                        }
                    }
                }
            } else if (str.equals("Room")) {
                LinkedTreeMap roomMap_ = (LinkedTreeMap) linkedTreeMap.get(str);
                String roomStr = gson.toJson(roomMap_);
                Type type3 = new TypeToken>() {
                }.getType();
                LinkedTreeMap roomMap = gson.fromJson(roomStr, type3);
                for (String roomKey : roomMap.keySet()) {
                    String roomValue = roomMap.get(roomKey);
                    parseString += "\t\t\t--Room:" + roomKey + ":" + roomValue + "\n";
                }
            }
        }
        tv.setText(parseString);
    }

输出的结果：

解析：
    ----Host----ID:29
    ----Host----LoginName:gm3
    ----Host----Name:总经理C
    ----Host----Email:
    --Room:MeetingID:6fa7eef5-6735-4fb1-a992-8088250be948
    --Room:MeetingRoomID:2ebbe73b-bee4-4a9e-81c9-f8ffc6ca1149
    --Room:Address:金融港-302会议室
    --Room:Date:2017-09-14
    --Room:Text:2017-09-14 14:00-15:00
    --Room:Value:[14:00][14:30]
    --items:
        actor:总经理A
        --file:1503808491.zip
        --url:http://aaa.com/tory/MeetAttents/808491.zip
    ID:6fa7eef5-735-4f1-a992-8088250be948
    Type:专题协调会议
    Title:就像在8888
    Address:金融港-302会议室
    Status:已结束
    Author:总经理A
    CreatedTime:2017-09-14 14:48
    QrCode:eyJ0eXBlIjozLCJpZCI6IjZmYThOTkyLTgwODgCx5YOP5ZyoODg4OCJ9
    Action:[VIEW][RECORDER]

源代码Demo下载