Java 从HashMap填充类属性

我想将HashMap中的项转换为类的属性。有没有一种方法可以在不手动映射每个字段的情况下执行此操作？我知道有了Jackson，我可以将所有内容转换为JSON并返回到属性设置正确的

GetDashboard.class

。这显然不是一种有效的方法

数据：

HashMap data=newhashmap（）；
数据输入（“WorkstationUID”、“asdfj32l4kjlkaslkdjflkj34”）；

类别：

public class GetDashboard implements EventHandler<Dashboard> {
    public String workstationUuid;

公共类GetDashboard实现EventHandler{ 公共字符串workstationuid；

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试试Apache Commons BeanUtils

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BeanUtils.populate（对象bean、映射属性）

如果您想自己动手：

上课

public class GetDashboard {
    private String workstationUuid;
    private int id;

    public String toString() {
        return "workstationUuid: " + workstationUuid + ", id: " + id;
    }
}

以下

// populate your map
HashMap<String, Object> data = new HashMap<String, Object>(); 
data.put("workstationUuid", "asdfj32l4kjlkaslkdjflkj34");
data.put("id", 123);
data.put("asdas", "Asdasd"); // this field does not appear in your class

Class<?> clazz = GetDashboard.class;
GetDashboard dashboard = new GetDashboard();
for (Entry<String, Object> entry : data.entrySet()) {
    try {
        Field field = clazz.getDeclaredField(entry.getKey()); //get the field by name
        if (field != null) {
            field.setAccessible(true); // for private fields
            field.set(dashboard, entry.getValue()); // set the field's value for your object
        }
    } catch (NoSuchFieldException | SecurityException e) {
        e.printStackTrace();
        // handle
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
        // handle
    } catch (IllegalAccessException e) {
        e.printStackTrace();
        // handle
    }
}

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如果类的属性不存在，它应该如何处理？反射是唯一的解决方案。对于每个键，检查类是否有同名字段，然后将其值设置为hashmap中的值。如果没有字段，则跳过它。这取决于hashmap的填充方式，即在某些情况下使用Spring可能会起作用

// populate your map
HashMap<String, Object> data = new HashMap<String, Object>(); 
data.put("workstationUuid", "asdfj32l4kjlkaslkdjflkj34");
data.put("id", 123);
data.put("asdas", "Asdasd"); // this field does not appear in your class

Class<?> clazz = GetDashboard.class;
GetDashboard dashboard = new GetDashboard();
for (Entry<String, Object> entry : data.entrySet()) {
    try {
        Field field = clazz.getDeclaredField(entry.getKey()); //get the field by name
        if (field != null) {
            field.setAccessible(true); // for private fields
            field.set(dashboard, entry.getValue()); // set the field's value for your object
        }
    } catch (NoSuchFieldException | SecurityException e) {
        e.printStackTrace();
        // handle
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
        // handle
    } catch (IllegalAccessException e) {
        e.printStackTrace();
        // handle
    }
}

java.lang.NoSuchFieldException: asdas
    at java.lang.Class.getDeclaredField(Unknown Source)
    at testing.Main.main(Main.java:100)
workstationUuid: asdfj32l4kjlkaslkdjflkj34, id: 123