Spring的屬性依賴檢查

spring支援4種依賴檢查：預設的是none

none – no dependency checking.

simple – if any properties of primitive type (int, long,double…) and collection types (map, list..) have not been set, unsatisfieddependencyexception will be thrown.

objects – if any properties of object type have not been set, unsatisfieddependencyexception will be thrown.

 　　　　all – if any properties of any type have not been set, an unsatisfieddependencyexception will be thrown.

舉個例子：

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<code>public class customer</code>

<code>{</code>

<code>    </code><code>private person person;</code>

<code>    </code><code>private int type;</code>

<code>    </code><code>private string action;</code>

<code> </code> 

<code>    </code><code>//getter and setter methods</code>

<code>}</code>

　　

<code>public class person</code>

<code>    </code><code>private string name;</code>

<code>    </code><code>private string address;</code>

<code>    </code><code>private int age;</code>

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<code>    </code><code>&lt;</code><code>bean</code> <code>id="customerbean" class="com.mkyong.common.customer" &gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="action" value="buy" /&gt;</code>

<code>    </code><code>&lt;/</code><code>bean</code><code>&gt;</code>

<code>    </code><code>&lt;</code><code>bean</code> <code>id="personbean" class="com.mkyong.common.person"&gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="name" value="mkyong" /&gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="address" value="address abc" /&gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="age" value="29" /&gt;</code>

<code>&lt;/</code><code>beans</code><code>&gt;</code>

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<code>    </code><code>&lt;</code><code>bean</code> <code>id="customerbean" class="com.mkyong.common.customer"</code>

<code>         </code><code>dependency-check="simple"&gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="person" ref="personbean" /&gt;</code>

　　注意此處type字段故意沒有設定，這樣會出現unsatisfieddependencyexception

<code>         </code><code>dependency-check="objects"&gt;</code>

<code>        </code><code>&lt;</code><code>property</code> <code>name="type" value="1" /&gt;</code>

　　此處故意沒有設定”person“屬性，會出現unsatisfieddependencyexception

<code>         </code><code>dependency-check="all"&gt;</code>

<code>    </code><code>default-dependency-check="all"&gt;</code>

<code>    </code><code>&lt;</code><code>bean</code> <code>id="customerbean" class="com.mkyong.common.customer"&gt;</code>