cksssssss:
私はJavaでGSONを使用して、このJSONファイルを解析しようとしていますが、私はいくつかの困難に実行しています。
{"group": [
{
"name": "Team1 Student2",
"email": "ctc-t1-s2",
"contribution": {
"score": 16.6,
"comment": "From 'Team1 Student2' about 'Team1 Student2'\nAnd they said, \"You'll never get it done!\""
}
}
,{
"name": "Team1 Student4",
"email": "mmi-t1-s4",
"contribution": {
"score": 0.4,
"comment": "From 'Team1 Student2' about 'Team1 Student4'\nAnd they said, \"You'll never get it done!\""
}
}
,{
"name": "Team1 Student3",
"email": "pco-t1-s3",
"contribution": {
"score": 39.1,
"comment": "From 'Team1 Student2' about 'Team1 Student3'\nAnd they said, \"You'll never get it done!\""
}
}
,{
"name": "Team1 Student1",
"email": "eyr-t1-s1",
"contribution": {
"score": 23.9,
"comment": "From 'Team1 Student2' about 'Team1 Student1'\nAnd they said, \"You'll never get it done!\""
}
}],"confidential_comments": "That's all! It was \"fun\"! (said Team1 Student2)\nDon't forget: Bring your towel \\ the cake is a lie."}
今、私はグループクラスであること、これら3つのクラスのいずれかを持っています:
public class Group {
private List<Student> group[];
public Group(List<Student> students[]){
this.group = students;
}
public void setStudents(List<Student> students[]) {
this.group = students;
}
public List<Student>[] getStudents() {
return group;
}
@Override
public String toString() {
return "Group{" +
"students=" + Arrays.toString(group) +
'}';
}
}
学生のクラスと同様に:
public class Student {
private String name;
private String sfu_email;
public Student(String name, String email){
this.name = name;
this.sfu_email = email;
}
public String getName() {
return name;
}
public String getEmail(){
return sfu_email;
}
public void setEmail(String email) {
this.sfu_email = email;
}
public void setName(String name) {
this.name = name;
}
public String toString(){
return getName() + " " + getName();
}
}
私はこれを実行すると、私の主な機能には、私はNULLオブジェクトを印刷してしまいます。
Gson gson = new Gson();
JsonParser jsonParser = new JsonParser();
try(Reader reader = new FileReader("FILE PATH")) {
JsonElement jsonObject = jsonParser.parse((reader));
System.out.println(jsonObject);
Group students = gson.fromJson(jsonObject, Group.class);
System.out.println(students);
Student student = gson.fromJson(jsonObject, Student.class);
System.out.println(student);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
私はあなたがオブジェクトまたはオブジェクトのリストにJSON文字列を取得しますので、あなたが入力ファイルを解析することができるだろうか疑問に思って?長い質問申し訳ありません。
Naveen:
Group
クラスが含まれList<Student>
、再び追加する必要がない、[]
の終わりにgroup
変数名。
public class Group {
private List<Student> group;
public void setStudents(List<Student> students) {
this.group = students;
}
public List<Student> getStudents() {
return group;
}
@Override
public String toString() {
return "Group [group=" + group + "]";
}
}
クラスのフィールド名は、JSONを一致させる必要があることを確認してください。
public class Student {
private String name;
private String email; //sfu_email changed to email
public Student(String name, String email) {
this.name = name;
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Student [name=" + name + ", email=" + email + "]";
}
上記の溶液にしてみてください。