根据指定方法的参数去构造一个新的对象的拷贝并将他返代码,Java代码库,德仔网

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【Java】根据指定方法的参数去构造一个新的对象的拷贝并将他返
作者: / 发布于2011/1/14/ 456
<div><span style="color: #008000">/**</span><span style="color: #008000"> 
 * 根据指定方法的参数去构造一个新的对象的拷贝并将他返回
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> obj 原始对象
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 新对象
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> NoSuchMethodException 
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> InvocationTargetException 
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> IllegalAccessException 
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> InstantiationException 
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> SecurityException 
 * </span><span style="color: #808080">@throws</span><span style="color: #008000"> IllegalArgumentException 
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 @SuppressWarnings(</span><span style="color: #000000">"</span><span style="color: #000000">unchecked</span><span style="color: #000000">"</span><span style="color: #000000">)
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> Object copy(Object obj) </span><span style="color: #0000ff">throws</span><span style="color: #000000"> IllegalArgumentException, SecurityException, InstantiationException, IllegalAccessException,
 InvocationTargetException, NoSuchMethodException
 {
 </span><span style="color: #008000">//</span><span style="color: #008000">获得对象的类型 </span><span style="color: #008000">
</span><span style="color: #000000"> Class classType </span><span style="color: #000000">=</span><span style="color: #000000"> obj.getClass();

 </span><span style="color: #008000">//</span><span style="color: #008000">通过默认构造方法去创建一个新的对象，getConstructor的视其参数决定调用哪个构造方法 </span><span style="color: #008000">
</span><span style="color: #000000"> Object objectCopy </span><span style="color: #000000">=</span><span style="color: #000000"> classType.getConstructor(</span><span style="color: #0000ff">new</span><span style="color: #000000"> Class[]{}).newInstance(</span><span style="color: #0000ff">new</span><span style="color: #000000"> Object[]{});

 </span><span style="color: #008000">//</span><span style="color: #008000">获得对象的所有属性 </span><span style="color: #008000">
</span><span style="color: #000000"> Field[] fields </span><span style="color: #000000">=</span><span style="color: #000000"> classType.getDeclaredFields();

 </span><span style="color: #0000ff">for</span><span style="color: #000000">(</span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> fields.length; i</span><span style="color: #000000">++</span><span style="color: #000000">)
 {
 </span><span style="color: #008000">//</span><span style="color: #008000">获取数组中对应的属性 </span><span style="color: #008000">
</span><span style="color: #000000"> Field field </span><span style="color: #000000">=</span><span style="color: #000000"> fields[i];

 String fieldName </span><span style="color: #000000">=</span><span style="color: #000000"> field.getName();
 String stringLetter </span><span style="color: #000000">=</span><span style="color: #000000"> fieldName.substring(</span><span style="color: #000000">0</span><span style="color: #000000">, </span><span style="color: #000000">1</span><span style="color: #000000">).toUpperCase();

 </span><span style="color: #008000">//</span><span style="color: #008000">获得相应属性的getXXX和setXXX方法名称 </span><span style="color: #008000">
</span><span style="color: #000000"> String getName </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">get</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> stringLetter </span><span style="color: #000000">+</span><span style="color: #000000"> fieldName.substring(</span><span style="color: #000000">1</span><span style="color: #000000">);
 String setName </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">set</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> stringLetter </span><span style="color: #000000">+</span><span style="color: #000000"> fieldName.substring(</span><span style="color: #000000">1</span><span style="color: #000000">);

 </span><span style="color: #008000">//</span><span style="color: #008000">获取相应的方法 </span><span style="color: #008000">
</span><span style="color: #000000"> Method getMethod </span><span style="color: #000000">=</span><span style="color: #000000"> classType.getMethod(getName, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Class[]{});
 Method setMethod </span><span style="color: #000000">=</span><span style="color: #000000"> classType.getMethod(setName, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Class[]{field.getType()});

 </span><span style="color: #008000">//</span><span style="color: #008000">调用源对象的getXXX（）方法 </span><span style="color: #008000">
</span><span style="color: #000000"> Object value </span><span style="color: #000000">=</span><span style="color: #000000"> getMethod.invoke(obj, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Object[]{});

 </span><span style="color: #008000">//</span><span style="color: #008000">调用拷贝对象的setXXX（）方法 </span><span style="color: #008000">
</span><span style="color: #000000"> setMethod.invoke(objectCopy, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Object[]{value});
 }

 </span><span style="color: #0000ff">return</span><span style="color: #000000"> objectCopy;
 }
</span>
</div>
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