英文:
How resolve Problem with Parsing Json in MyObject?
问题
抱歉，我明白您只需要翻译文本内容，不需要额外的回答。以下是您提供的内容的翻译：
我对我的代码有一个大问题。我创建了一个用于序列化和反序列化Json对象的个人类，并且我使用了GSON，但是。
这是我的类。
public class JsonUtil<T> {
private Gson gson = new Gson();
public JsonUtil() {}
public List<T> getJsonsFile(File file) throws IOException {
List<T> list = null;
try (Reader reader = new FileReader(file.getPath())) {
list = gson.fromJson(reader, new TypeToken<Collection<T>>(){}.getType());
return list;
}
}
public void writeJsonInFile(File file, List<T> list) throws IOException {
try (Writer writer = new FileWriter(file.getPath())) {
gson.toJson(list, writer);
}
}
这是我的主类
public class Prova {
public String id;
public Prova(String a) {
id = a;
}
public static void main(String[] args) {
final File file = new File("MyFollowers copia.json");
JsonUtil<Prova> jsonUtil = new JsonUtil<>();
List<Prova> a = null;
try {
a = jsonUtil.getJsonsFile(file);
} catch (IOException e) {}
System.out.println(a.get(0));
}
我的Json示例
[{"id":"alexandra04.___"},{"id":"riky_vicini"},{"id":"martatofanarii"},{"id":"about._mary"}]
现在当我运行我的代码时，我得到了这个输出
{id=alexandra04.___}
我查找了这些问题，但我不明白如何解决这个问题。
我想要我的对象 List<Prova> a 包含所有的 Prova 对象，并且我想要使用以下代码
for (Prova prova : a) {
System.out.println(a.id);
}
嗨，我用以下代码解决了这个问题
public <T> List<T> getJsonsFile(File file, Class<T> cls) throws IOException {
List<T> list = new ArrayList<T>();
try (Reader reader = new FileReader(file.getPath())) {
JsonArray array = new JsonParser().parse(reader).getAsJsonArray();
for (JsonElement jsonElement : array) {
list.add(gson.fromJson(jsonElement, cls));
}
return list;
}
}
英文:
Hi i have a big problem with my code. I realize a personal class for serialize and deserialize objects in Json and for this i use GSON but.
This is my class.
public class JsonUtil<T> {
private Gson gson=new Gson();
public JsonUtil(){}
public List<T> getJsonsFile(File file) throws IOException{
List<T> list=null;
try(Reader reader=new FileReader(file.getPath())) {
list= gson.fromJson(reader, new TypeToken<Collection<T>>(){}.getType());
return list;
}
}
public void writeJsonInFile(File file,List<T> list) throws IOException{
try(Writer writer=new FileWriter(file.getPath())){
gson.toJson(list, writer);
}
}
And this is my main
public class Prova{
public String id;
public Prova(String a){
id=a;
}
public static void main(String[] args){
final File file=new File("MyFollowers copia.json");
JsonUtil<Prova> jsonUtil=new JsonUtil<>();
List<Prova> a=null;
try{
a=jsonUtil.getJsonsFile(file);
}catch (IOException e){}
System.out.println(a.get(0));
}
My example of Json
[{"id":"alexandra04.___"},{"id":"riky_vicini"},{"id":"martatofanarii"},{"id":"about._mary"}]
Now when i run my code i get this output
{id=alexandra04.___}
I search this problems but i don't understand how to resolve this
I'll want my object List<Prova> a with all objects Prova and i'll want use this
for(Prova prova:a){System.out.println(a.id);}
HI I RESOLVED WITH THIS
public <T> List<T> getJsonsFile(File file,Class<T> cls) throws IOException{
List<T> list=new ArrayList<T>();
try(Reader reader=new FileReader(file.getPath())) {
JsonArray arry=new JsonParser().parse(reader).getAsJsonArray();
for(JsonElement jsonElement:arry){
list.add(gson.fromJson(jsonElement,cls));
}
return list;
//return list;
}
}
答案1
得分: 2
你的代码运行得很好，你只需要更改代码中的最后一条指令，因为你在控制台显示的是列表中的第一个元素
System.out.println(a.get(0)); // 将此指令更改为以下内容
System.out.println(a); // 显示结果为 [{id=alexandra04.___}, {id=riky_vicini}, {id=martatofanarii}, {id=about._mary}]
英文:
your code work perfectly you need to change last instruction in your code because you show in console first element in list
System.out.println(a.get(0)); // change this instruction by this
System.out.println(a); // show result is [{id=alexandra04.___}, {id=riky_vicini}, {id=martatofanarii}, {id=about._mary}]
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