spring boot如何在java中按列存储数组列表中的数据?
大家好,我有一张地图<;字符串,列表>;i、 e.字符串存储标题,对象列表分别存储其值。我想在数组列表中逐个存储数据,如下所示强>
以下是我要存储在数组列表中的数据格式:-
[ Pojo(foo1=636580, foo2=CIVIL, foo3=29/06/2021),
Pojo(foo1=636580, foo2=CIVIL, foo3=29/06/2021),
Pojo(foo1=636580, foo2=CIVIL, foo3=29/06/2021),
Pojo(foo1=636580, foo2=CIVIL, foo3=29/06/2021),
Pojo(foo1=636580, foo2=CIVIL, foo3=29/06/2021),
]
但数据存储为:
[
Pojo(foo1=636580, foo2=N/A, foo3=N/A),
Pojo(foo1=636580, foo2=N/A, foo3=N/A),
Pojo(foo1=636580, foo2=N/A, foo3=N/A),
Pojo(foo1=636580, foo2=N/A, foo3=N/A),
Pojo(foo1=636580, foo2=N/A, foo3=N/A),
Pojo(foo1=N/A, foo2=CIVIL , foo3=N/A),
Pojo(foo1=N/A, foo2=CIVIL , foo3=N/A),
Pojo(foo1=N/A, foo2=CIVIL , foo3=N/A),
Pojo(foo1=N/A, foo2=CIVIL , foo3=N/A),
Pojo(foo1=N/A, foo2=CIVIL , foo3=N/A),
Pojo(foo1=N/A, foo2=N/A, foo3=29/06/2021),
Pojo(foo1=N/A, foo2=N/A, foo3=29/06/2021),
Pojo(foo1=N/A, foo2=N/A, foo3=29/06/2021),
Pojo(foo1=N/A, foo2=N/A, foo3=29/06/2021),
Pojo(foo1=N/A, foo2=N/A, foo3=29/06/2021)
]
这是我的pojo课程:-
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Pojo {
private String foo1= "N/A";
private String foo2= "N/A";
private String foo3= "N/A";
}
这是我的密码:-
Map<String, List<Object>> myMap = new HashMap<>();
List<String> strings = new ArrayList<>();
strings.add("foo1");
strings.add("foo2");
strings.add("foo3");
List<Pojo> pojos = new ArrayList<>();
for (String string : strings) {
Pojo pojo = new Pojo();
for (Map.Entry<String, List<Object>> entry : myMap.entrySet()) {
int max = myMap.values().stream().map(List::size).max(Integer::compareTo).get() - 1;
if (entry.getKey().equalsIgnoreCase(string)) {
while (max >= 0) {
pojo = getPropertyValue(entry.getKey(), entry.getValue().get(max), pojo);
pojos.add(pojo);
max--;
}
}
}
}
System.out.println(pojos);
以下是我的getPropertyValue方法:-
Class<?> unreconciledTransactionClass = Class.forName("com.example.looping.rohit.Pojo"); // convert string classname to class
Object data;
if (pojo != null) {
data = pojo;
} else {
data = unreconciledTransactionClass.getDeclaredConstructor().newInstance(); // invoke empty constructor
}
PropertyAccessor myAccessor = PropertyAccessorFactory.forBeanPropertyAccess(data);
myAccessor.setPropertyValue(attributeName, value);
return (Pojo) data;
}
# 1 楼答案
下面是解决问题的代码。 我添加了一个try/catch块,以便在myMap中处理不同大小的列表的情况