增加getProperty

hsweb-core/src/main/java/org/hswebframework/web/bean/FastBeanCopier.java

@@ -87,6 +87,12 @@ public final class FastBeanCopier {
         };
     }
 
+    public static Object getProperty(Object source, String key) {
+        SingleValueMap<Object,Object> map = new SingleValueMap<>();
+        copy(source, map, include(key));
+        return map.getValue();
+    }
+
     public static <T, S> T copy(S source, T target, String... ignore) {
         return copy(source, target, DEFAULT_CONVERT, ignore);
     }
@@ -571,7 +577,7 @@ public final class FastBeanCopier {
                 return (T) collection;
             }
 
-            if (target.isEnumType()){
+            if (target.isEnumType()) {
                 if (target.isEnumDict()) {
                     String strVal = String.valueOf(source);
 
@@ -609,11 +615,11 @@ public final class FastBeanCopier {
 
                 //快速复制map
                 if (targetClass == Map.class) {
-                    if(source instanceof Map) {
+                    if (source instanceof Map) {
                         return (T) new HashMap(((Map<?, ?>) source));
                     }
                     ClassDescription sourType = ClassDescriptions.getDescription(source.getClass());
-                    return (T)copy(source, Maps.newHashMapWithExpectedSize(sourType.getFieldSize()));
+                    return (T) copy(source, Maps.newHashMapWithExpectedSize(sourType.getFieldSize()));
                 }
 
                 return copy(source, beanFactory.newInstance(targetClass), this);

hsweb-core/src/main/java/org/hswebframework/web/bean/SingleValueMap.java

@@ -0,0 +1,108 @@
+package org.hswebframework.web.bean;
+
+import java.util.*;
+
+public class SingleValueMap<K, V> implements Map<K, V> {
+    private K key;
+    private V value;
+
+    @Override
+    public int size() {
+        return value == null ? 0 : 1;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return size() == 0;
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+        return Objects.equals(this.key, key);
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+        return Objects.equals(this.value, value);
+    }
+
+    @Override
+    public V get(Object key) {
+        return null;
+    }
+
+    @Override
+    public V put(K key, V value) {
+        this.key = key;
+        V old = this.value;
+        this.value = value;
+        return old;
+    }
+
+    @Override
+    public V remove(Object key) {
+        if (Objects.equals(key, this.key)) {
+            V old = this.value;
+            this.value = null;
+            return old;
+        }
+        return null;
+    }
+
+    @Override
+    public void putAll(Map<? extends K,? extends V> m) {
+        if (m.size() > 0) {
+            Map.Entry<? extends K,? extends V> entry = m.entrySet().iterator().next();
+            this.key = entry.getKey();
+            this.value = entry.getValue();
+        }
+    }
+
+    @Override
+    public void clear() {
+        this.key = null;
+        this.value = null;
+    }
+
+    @Override
+    public Set<K> keySet() {
+        return key == null ? Collections.emptySet() : Collections.singleton(key);
+    }
+
+    @Override
+    public Collection<V> values() {
+        return value == null ? Collections.emptySet() : Collections.singleton(value);
+    }
+
+    @Override
+    public Set<Entry<K, V>> entrySet() {
+        return key == null ? Collections.emptySet() : Collections.singleton(
+                new Entry<K, V>() {
+                    @Override
+                    public K getKey() {
+                        return key;
+                    }
+
+                    @Override
+                    public V getValue() {
+                        return value;
+                    }
+
+                    @Override
+                    public V setValue(V value) {
+                        V old = SingleValueMap.this.value;
+                        SingleValueMap.this.value = value;
+                        return old;
+                    }
+                }
+        );
+    }
+
+    public V getValue() {
+        return value;
+    }
+
+    public K getKey() {
+        return key;
+    }
+}