Java GSON解析关于对象数组的JSON异常
我正在使用谷歌的GSON解析库，我不确定以前是否有人问过这个问题（我确实检查过我能找到什么），但是，我来了！！这是关于Java GSON解析关于对象数组的JSON异常,java,arrays,json,gson,Java,Arrays,Json,Gson,我正在使用谷歌的GSON解析库，我不确定以前是否有人问过这个问题（我确实检查过我能找到什么），但是，我来了！！这是关于fromJSON方法，以及它如何拒绝将某些类解释为数组 考虑到下面的JSON结构： {"visualization": { "root": { "fullname": "CC/dudu", "name": "dudu", "type": "String", "children": [ { "fullname"
fromJSON{"visualization": {
"root": {
"fullname": "CC/dudu",
"name": "dudu",
"type": "String",
"children": [
{
"fullname": "CC/dudu/lulu",
"name": "lulu",
"type": "String"
}
]
},
"traces": {
"messages": [
{
"from": "dudu",
"method": "call()",
"scenario": "#1",
"timestamp": "09-12-2013 00:21:14",
"to": "dudu",
"type": "void",
"violation": "true",
"visible": "true"
}
],
"scenarios": [
{
"name": "testscenario",
"id": "#1",
"description": "testing parsing!"
}
]
}
}}
public class Response {
private Visualization visualization;
//+getter/setter
}
public class Visualization {
private Component root;
private Map<String, Trace> traces;
//+getter/setter
}
public class Trace {
private ArrayList<Message> messages;
private ArrayList<Scenario> scenarios;
//+getter/setter
}
package stackoverflow.questions;
import java.util.*;
import com.google.gson.Gson;
public class Q20461706 {
public class Trace {
ArrayList<Message> messages;
ArrayList<Scenario> scenarios;
@Override
public String toString() {
return "Trace [messages=" + messages + ", scenarios=" + scenarios + "]";
}
}
public static class Message {
String from; // "from": "dudu",
String method; // "method": "call()",
String scenario; // "scenario": "#1",
String timestamp; // "timestamp": "09-12-2013 00:21:14",
String to; // "to": "dudu",
String type; // "type": "void",
Boolean violation; // "violation": "true",
Boolean visible; // "visible": "true"
@Override
public String toString() {
return "Message [from=" + from + ", method=" + method + ", scenario=" + scenario + ", timestamp=" + timestamp + ", to=" + to + ", type=" + type + ", violation=" + violation + ", visible=" + visible + "]";
}
}
public static class Scenario {
String name;// "name": "testscenario",
String id; // "id": "#1",
String description; // "description": "testing parsing!"
@Override
public String toString() {
return "Scenario [name=" + name + ", id=" + id + ", description=" + description + "]";
}
}
public static class Component {
String fullname; // "fullname": "CC/dudu",
String name; // "name": "dudu",
String type; // "type": "String",
List<Component> children;
@Override
public String toString() {
return "Component [fullname=" + fullname + ", name=" + name + ", type=" + type + ", children=" + children + "]";
}
}
public static class Visualization {
Component root;
Trace traces;
@Override
public String toString() {
return "Visualization [root=" + root + ", traces=" + traces + "]";
}
}
public static class Response {
Visualization visualization;
@Override
public String toString() {
return "Response [visualization=" + visualization + "]";
}
}
public static void main(String[] args) {
String json =
" {\"visualization\": { "+
" \"root\": { "+
" \"fullname\": \"CC/dudu\", "+
" \"name\": \"dudu\", "+
" \"type\": \"String\", "+
" \"children\": [ "+
" { "+
" \"fullname\": \"CC/dudu/lulu\", "+
" \"name\": \"lulu\", "+
" \"type\": \"String\" "+
" } "+
" ] "+
" }, "+
" \"traces\": { "+
" \"messages\": [ "+
" { "+
" \"from\": \"dudu\", "+
" \"method\": \"call()\", "+
" \"scenario\": \"#1\", "+
" \"timestamp\": \"09-12-2013 00:21:14\", "+
" \"to\": \"dudu\", "+
" \"type\": \"void\", "+
" \"violation\": \"true\", "+
" \"visible\": \"true\" "+
" } "+
" ], "+
" \"scenarios\": [ "+
" { "+
" \"name\": \"testscenario\", "+
" \"id\": \"#1\", "+
" \"description\": \"testing parsing!\" "+
" } "+
" ] "+
" } "+
" }} ";
Gson gsonParser = new Gson();
Response r = gsonParser.fromJson(json, Response.class);
System.out.println(r);
}
}
下面的代码允许您精确解析JSON 请注意，我将所有内容都放在一个类中，以便于您进行测试。无论如何，Gson不能很好地处理内部类，除非它们是静态的。所以我建议您为每个类创建一个文件，或者只使用静态内部类
public class Response {
private Visualization visualization;
//+getter/setter
}
public class Visualization {
private Component root;
private Map<String, Trace> traces;
//+getter/setter
}
public class Trace {
private ArrayList<Message> messages;
private ArrayList<Scenario> scenarios;
//+getter/setter
}
package stackoverflow.questions;
import java.util.*;
import com.google.gson.Gson;
public class Q20461706 {
public class Trace {
ArrayList<Message> messages;
ArrayList<Scenario> scenarios;
@Override
public String toString() {
return "Trace [messages=" + messages + ", scenarios=" + scenarios + "]";
}
}
public static class Message {
String from; // "from": "dudu",
String method; // "method": "call()",
String scenario; // "scenario": "#1",
String timestamp; // "timestamp": "09-12-2013 00:21:14",
String to; // "to": "dudu",
String type; // "type": "void",
Boolean violation; // "violation": "true",
Boolean visible; // "visible": "true"
@Override
public String toString() {
return "Message [from=" + from + ", method=" + method + ", scenario=" + scenario + ", timestamp=" + timestamp + ", to=" + to + ", type=" + type + ", violation=" + violation + ", visible=" + visible + "]";
}
}
public static class Scenario {
String name;// "name": "testscenario",
String id; // "id": "#1",
String description; // "description": "testing parsing!"
@Override
public String toString() {
return "Scenario [name=" + name + ", id=" + id + ", description=" + description + "]";
}
}
public static class Component {
String fullname; // "fullname": "CC/dudu",
String name; // "name": "dudu",
String type; // "type": "String",
List<Component> children;
@Override
public String toString() {
return "Component [fullname=" + fullname + ", name=" + name + ", type=" + type + ", children=" + children + "]";
}
}
public static class Visualization {
Component root;
Trace traces;
@Override
public String toString() {
return "Visualization [root=" + root + ", traces=" + traces + "]";
}
}
public static class Response {
Visualization visualization;
@Override
public String toString() {
return "Response [visualization=" + visualization + "]";
}
}
public static void main(String[] args) {
String json =
" {\"visualization\": { "+
" \"root\": { "+
" \"fullname\": \"CC/dudu\", "+
" \"name\": \"dudu\", "+
" \"type\": \"String\", "+
" \"children\": [ "+
" { "+
" \"fullname\": \"CC/dudu/lulu\", "+
" \"name\": \"lulu\", "+
" \"type\": \"String\" "+
" } "+
" ] "+
" }, "+
" \"traces\": { "+
" \"messages\": [ "+
" { "+
" \"from\": \"dudu\", "+
" \"method\": \"call()\", "+
" \"scenario\": \"#1\", "+
" \"timestamp\": \"09-12-2013 00:21:14\", "+
" \"to\": \"dudu\", "+
" \"type\": \"void\", "+
" \"violation\": \"true\", "+
" \"visible\": \"true\" "+
" } "+
" ], "+
" \"scenarios\": [ "+
" { "+
" \"name\": \"testscenario\", "+
" \"id\": \"#1\", "+
" \"description\": \"testing parsing!\" "+
" } "+
" ] "+
" } "+
" }} ";
Gson gsonParser = new Gson();
Response r = gsonParser.fromJson(json, Response.class);
System.out.println(r);
}
}
package stackoverflow.questions；
导入java.util.*；
导入com.google.gson.gson；
公共类Q20461706{
公共类跟踪{
ArrayList消息；
阵列列表场景；
@凌驾
公共字符串toString（）{
返回“Trace[messages=“+messages+”，scenarios=“+scenarios+”]；
}
}
公共静态类消息{
字符串from；/“from”：“dudu”，
字符串方法；/“方法”：“call（）”，
字符串scenario；/“scenario”：“#1”，
字符串时间戳；/“时间戳”：“09-12-2013 00:21:14”，
字符串to；/“to”：“dudu”，
字符串类型；/“类型”：“void”，
布尔冲突；/“冲突”：“真”，
布尔可见；/“可见”：“真”
@凌驾
公共字符串toString（）{
返回“Message[from=“+from+”，method=“+method+”，scenario=“+scenario+”，timestamp=“+timestamp+”，to=“+to+”，type=“+type+”，invalition=“+invalition+”，visible=“+visible+””；
}
}
公共静态类场景{
字符串名称；/“名称”：“testscenario”，
字符串id；/“id”：“#1”，
字符串说明；/“说明”：“正在测试解析！”
@凌驾
公共字符串toString（）{
return“Scenario[name=“+name+”，id=“+id+”，description=“+description+””；
}
}
公共静态类组件{
字符串fullname；/“fullname”：“CC/dudu”，
字符串名称；/“名称”：“dudu”，
字符串类型；/“类型”：“字符串”，
列出儿童名单；
@凌驾
公共字符串toString（）{
返回“Component[fullname=“+fullname+”，name=“+name+”，type=“+type+”，children=“+children+”””；
}
}
公共静态类可视化{
组分根；
痕迹；
@凌驾
公共字符串toString（）{
返回“可视化[root=“+root+”，traces=“+traces+”]”；
}
}
公共静态类响应{
可视化；
@凌驾
公共字符串toString（）{
返回“Response[visualization=“+visualization+”]”；
}
}
公共静态void main（字符串[]args）{
字符串json=
“{\”可视化\“：{”+
“\”根\“：{”+
“\”全名“：\”抄送/杜杜“，”+
“\'name\：\'dudu\”，”+
“\”类型\“：\”字符串\“+
“\'children\”：[”+
" { "+
“\”全名“：\”CC/dudu/lulu\”+
“\'name\'：\'lulu\'，”+
“\”类型“：\”字符串“+
" } "+
" ] "+
" }, "+
“\“traces\”：{”+
“\“消息\”：[”+
" { "+
“\”from\“：\”dudu\“，”+
“\”方法\“：\”调用（）\”，“+
“\”场景\:\“\”1\”+
“\“时间戳\”：\“09-12-2013 00:21:14\”，”+
“\”to\：\”嘟嘟“+
“\”类型\“：\”无效\“+
“\”违反“：\”正确“，”+
“\”可见“：\”真实“+
" } "+
" ], "+
“\“场景\”：[”+
" { "+
“\”名称\“：\”测试方案\“，”+
“\“id\”：\“\”1\“，”+
“\”说明\“：\”测试解析！\“”+
" } "+
" ] "+
" } "+
" }} ";
Gson gsonParser=new Gson（）；
Response r=gsonParser.fromJson（json，Response.class）；
系统输出println（r）；
}
}
可视化跟踪跟踪还请注意，我避免将日期解析为日期，您需要为此指定自定义日期格式，但这超出了本问题的范围。您可以在这里找到许多这样的示例。向我们展示尝试解析该JSON的代码。请注意，您缺少一个结束语
}可视化