Gson实现：修改json字符串中某个key对应的value值、如何修改json字符串中某个key

怼烎@ 2024-03-26 18:24 95阅读 0赞

## 修改json字符串中某个key ##

public static JsonElement replaceKey(JsonElement source, Map<String, String> rep) {
        
        if (source == null || source.isJsonNull()) {
        
            return JsonNull.INSTANCE;
        }
        if (source.isJsonPrimitive()) {
        
            return source;
        }
        if (source.isJsonArray()) {
        
            JsonArray jsonArr = source.getAsJsonArray();
            JsonArray jsonArray = new JsonArray();
            jsonArr.forEach(item -> {
        
                jsonArray.add(replaceKey(item, rep));
            });
            return jsonArray;
        }
        if (source.isJsonObject()) {
        
            JsonObject jsonObj = source.getAsJsonObject();
            Iterator<Entry<String, JsonElement>> iterator = jsonObj.entrySet().iterator();
            JsonObject newJsonObj = new JsonObject();
            iterator.forEachRemaining(item -> {
        
                String key = item.getKey();
                JsonElement value = item.getValue();
                if (rep.containsKey(key)) {
        
                    String newKey = rep.get(key);
                    key = newKey;
                }
                newJsonObj.add(key, replaceKey(value, rep));
            });
    
            return newJsonObj;
        }
        return JsonNull.INSTANCE;
    }

## 修改json字符串中某个key对应的value值 ##

public static JsonElement replaceJsonNode(JsonElement jsonElement, Map<String, Object> map) {
        
    
        if (map.size() == 0) {
        
            return jsonElement;
        }
    
        // 判断如果是简单json串直接返回
        if (jsonElement.isJsonPrimitive()) {
        
            return jsonElement;
        }
    
        // 判断如果是数组类型字符串，则逐个解析
        if (jsonElement.isJsonArray()) {
        
            JsonArray jsonArray = jsonElement.getAsJsonArray();
            JsonArray jsonArryNew = new JsonArray();
            for (JsonElement element : jsonArray) {
        
                // 递归调用
                jsonArryNew.add(replaceJsonNode(element, map));
            }
            return jsonArryNew;
        }
    
        // 判断如果是key-value类型的
        if (jsonElement.isJsonObject()) {
        
            JsonObject object = jsonElement.getAsJsonObject();
            JsonObject objectNew = new JsonObject();
            for (String key : object.keySet()) {
        
                // 如果和目标字段匹配则更换value;
                if (map.containsKey(key)) {
        
                    Object newValue = map.get(key);
                    if (newValue instanceof String) {
        
                        object.addProperty(key, (String) newValue);
                    } else if (newValue instanceof Boolean) {
        
                        object.addProperty(key, (Boolean) newValue);
                    } else if (newValue instanceof Character) {
        
                        object.addProperty(key, (Character) newValue);
                    } else {
        
                        object.addProperty(key, (Number) newValue);
                    }
                }
                JsonElement jsonEle = object.get(key);
                JsonElement jsonElementNew = replaceJsonNode(jsonEle, map);
                objectNew.add(key, jsonElementNew);
            }
            return objectNew;
        }
        return jsonElement;
    }

## 测试 ##

public static void main(String[] args) {
        
        String json = "{\"order_sn\":\"14031000273822\",\"carriers_code\":1100000357,\"carrier\":\"浙江派尔快递\",\"package_type\":2,\"packages\":[{\"0\":{\"good_sn\":\"ALM2236W36\",\"amount\":\"2\"},\"1\":{\"good_sn\":\"ALM2236W37\",\"amount\":\"2\"},\"transport_no\":\"test5715A\"},{\"0\":{\"good_sn\":\"ALM2236W35\",\"amount\":\"2\"},\"transport_no\":\"test5715B\"}]}";
        JsonElement jsonEle = new JsonParser().parse(json);
        HashMap<String, String> rep = new HashMap<>();
        rep.put("order_sn", "order_id");
        rep.put("carriers_code", "carrier_code");
        rep.put("good_sn", "barcode");
        JsonElement replaceKey = replaceKey(jsonEle, rep);
        System.out.println(replaceKey.toString());
    
        Map<String, Object> map = new HashMap();
        map.put("order_sn","00000000");
        map.put("carriers_code","9999999");
        map.put("good_sn",888);
        System.out.println(replaceJsonNode(jsonEle, map).toString());
    }

结果

1.  运行前
    
        {
              
            "order_sn": "14031000273822",
            "carriers_code": 1100000357,
            "carrier": "浙江派尔快递",
            "package_type": 2,
            "packages": [
                {
              
                    "0": {
              
                        "good_sn": "ALM2236W36",
                        "amount": "2"
                    },
                    "1": {
              
                        "good_sn": "ALM2236W37",
                        "amount": "2"
                    },
                    "transport_no": "test5715A"
                },
                {
              
                    "0": {
              
                        "good_sn": "ALM2236W35",
                        "amount": "2"
                    },
                    "transport_no": "test5715B"
                }
            ]
        }
2.  运行后
    
     *  修改key
        
            {
                    
                "order_id": "14031000273822",
                "carrier_code": 1100000357,
                "carrier": "浙江派尔快递",
                "package_type": 2,
                "packages": [
                    {
                    
                        "0": {
                    
                            "barcode": "ALM2236W36",
                            "amount": "2"
                        },
                        "1": {
                    
                            "barcode": "ALM2236W37",
                            "amount": "2"
                        },
                        "transport_no": "test5715A"
                    },
                    {
                    
                        "0": {
                    
                            "barcode": "ALM2236W35",
                            "amount": "2"
                        },
                        "transport_no": "test5715B"
                    }
                ]
            }
     *  修改对应key的value
        
            {
                    
                "order_sn": "00000000",
                "carriers_code": "9999999",
                "carrier": "浙江派尔快递",
                "package_type": 2,
                "packages": [
                    {
                    
                        "0": {
                    
                            "good_sn": 888,
                            "amount": "2"
                        },
                        "1": {
                    
                            "good_sn": 888,
                            "amount": "2"
                        },
                        "transport_no": "test5715A"
                    },
                    {
                    
                        "0": {
                    
                            "good_sn": 888,
                            "amount": "2"
                        },
                        "transport_no": "test5715B"
                    }
                ]
            }