JAVA,GSON: - 使用GSON在json对象中添加多个数据 [英] JAVA,GSON :- add multiple data in json object using GSON
问题描述
我试图在单个JSON对象中添加多个数据,但它被覆盖。
我看了一些stackoverflow问题,但找不到任何答案(也许我不知道如何在google中搜索)
Gson打开一个数组的数据对象转换为json - Android
这是我迄今为止所做的事情: -
是我使用GSON库的代码: - $ / $>
JsonObject jsonObject = new JsonObject();
jsonObject.addProperty(metric,name1);
jsonObject.addProperty(timestamp,1443785014);
jsonObject.addProperty(value,18);
JsonObject jObject = new JsonObject();
jObject.addProperty(host,one);
jObject.addProperty(host1,two);
jsonObject.add(tags,jObject);
jsonObject.addProperty(metric,name2);
jsonObject.addProperty(timestamp,1443785014);
jsonObject.addProperty(value,9);
jObject.addProperty(host,one);
jObject.addProperty(host1,two);
jsonObject.add(tags,jObject);
System.out.println(jsonObject);
这就是我得到的结果: - $ /
{
pre>
metric:name2,
timestamp:1346846400,
value:9,
标签:{
host:one,
host1:two
}
}
这是我想要的结果: -
[
公制:name1,
timestamp:1346846400,
value:18,
tags:{
host:one,
host1:two
}
},
{
metric:name2,
timestamp:1346846400,
value:9,
tags:{
host:one,
host1:two
$ b为什么我没有得到name1
和name2
in JSON Object?解决方案创建JSONObjects a nd JSONArrays手工操作可能非常麻烦,下面我将向您展示如何使用Gson库创建并显示为json数据结构:
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
class Stats
{
private String metric;
私人长时间戳;
private int value;
私人地图< String,String> tags = new HashMap<>();
/ **
* @返回指标
* /
public String getMetric(){
return metric;
}
/ **
* @param度量标准设置
* /
public void setMetric(String metric){
this.metric =度量;
$ b $ **
* @返回时间戳
* /
public long getTimestamp(){
return timestamp;
}
/ **
* @param timestamp设置
* /
的时间戳public void setTimestamp(long timestamp){
this.timestamp =时间戳;
}
/ **
* @返回值
* /
public int getValue(){
返回值;
}
/ **
* @param value设置的值
* /
public void setValue(int value){
this.value =值;
}
/ **
* @return the tags
* /
public Map< String,String> getTags(){
返回标签;
}
/ **
* @param标记标签以设置
* /
public void setTags(Map< String,String> tags){
this.tags =标签;
$ b public class JSON {
public static final main(String args [])
{
列表与LT;统计> stats = new ArrayList< Stats>();
//填写数据,你知道,无论
Stats stat1 = new Stats();
stat1.setMetric(metric1);
stat1.getTags()。put(tag1,value1);
stat1.getTags()。put(tag2,value2);
统计信息stat2 = new Stats();
stat2.setMetric(metric2);
// ...填充数据...
// ...将数据添加到数组
stats.add(stat1);
stats.add(stat2);
Gson gson = new GsonBuilder()。setPrettyPrinting()。create();
System.out.println(gson.toJson(stats));
返回:
$ $ $
metric:metric1,
timestamp:0,
value :0,
tags:{
tag2:value2,
tag1:value1
}
},
{
metric:metric2,
timestamp:0,
value:0,
tags:{}
}
]
I am trying to add multiple data in single JSON object but its getting overwritten.
I looked at some of the stackoverflow question but i couldn't find any answers .(maybe i dont know how to search in google)
Gson turn an array of data objects into json - Android
This is what i have done so far:-
This is my code using GSON library :-
JsonObject jsonObject = new JsonObject(); jsonObject.addProperty("metric", "name1"); jsonObject.addProperty("timestamp", 1443785014); jsonObject.addProperty("value", 18); JsonObject jObject = new JsonObject(); jObject.addProperty("host", "one"); jObject.addProperty("host1", "two"); jsonObject.add("tags",jObject); jsonObject.addProperty("metric", "name2"); jsonObject.addProperty("timestamp", 1443785014); jsonObject.addProperty("value", 9); jObject.addProperty("host", "one"); jObject.addProperty("host1", "two"); jsonObject.add("tags",jObject); System.out.println(jsonObject);
This is what i get as output :-
{ "metric": "name2", "timestamp": 1346846400, "value": 9, "tags": { "host": "one", "host1": "two" } }
here is what i want as output :-
[ { "metric": "name1", "timestamp": 1346846400, "value": 18, "tags": { "host": "one", "host1": "two" } }, { "metric": "name2", "timestamp": 1346846400, "value": 9, "tags": { "host": "one", "host1": "two" } } ]
Why i am not getting both
name1
andname2
in JSON Object?解决方案Creating JSONObjects and JSONArrays by hand can be really messy, here I show you how to create and show as json your data structure by using Gson library:
import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.google.gson.Gson; import com.google.gson.GsonBuilder; class Stats { private String metric; private long timestamp; private int value; private Map<String,String> tags=new HashMap<>(); /** * @return the metric */ public String getMetric() { return metric; } /** * @param metric the metric to set */ public void setMetric(String metric) { this.metric = metric; } /** * @return the timestamp */ public long getTimestamp() { return timestamp; } /** * @param timestamp the timestamp to set */ public void setTimestamp(long timestamp) { this.timestamp = timestamp; } /** * @return the value */ public int getValue() { return value; } /** * @param value the value to set */ public void setValue(int value) { this.value = value; } /** * @return the tags */ public Map<String, String> getTags() { return tags; } /** * @param tags the tags to set */ public void setTags(Map<String, String> tags) { this.tags = tags; } } public class JSON { public static final void main(String args[]) { List<Stats> stats=new ArrayList<Stats>(); // Fill data, you know, whatever Stats stat1=new Stats(); stat1.setMetric("metric1"); stat1.getTags().put("tag1","value1"); stat1.getTags().put("tag2","value2"); Stats stat2=new Stats(); stat2.setMetric("metric2"); // ... Fill data... // ... Add stats to array stats.add(stat1); stats.add(stat2); Gson gson=new GsonBuilder().setPrettyPrinting().create(); System.out.println(gson.toJson(stats)); } }
Returning:
[ { "metric": "metric1", "timestamp": 0, "value": 0, "tags": { "tag2": "value2", "tag1": "value1" } }, { "metric": "metric2", "timestamp": 0, "value": 0, "tags": {} } ]
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