Ajax 請求時莫明執行其它未調用的 Action 的原因及解決方式

最近在一個項目中使用了 Ajax ，後臺代碼採用了 Annotation 的方式進行註解，爲了方便，我把相關的 Ajax 請求的 Action 方法都封到了一個類裏面，如下：

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction extends ActionSupport {
	// 此處省略屬性的定義及 get/set 方法

	/**
	 * 根據用戶名檢測用戶是否需要驗證碼
	 * 
	 * @return
	 */
	@Action(value = "isneedcapcha", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String checkNeedCapcha() {
		// 省略方法具體業務邏輯
		return SUCCESS;
	}

	@Action(value = "delserversession", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String delServerSessionBySid() {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}

	@Action(value = "getallserversessionmodel", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String getAllServerSession() throws Exception {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}
}

當我調用到 isneedcapcha 這個 Action 時，我發現 getallserversessionmodel 對應的方法也被執行了，但我排查了很久，getallserversessionmodel 這個 Action 我並沒有去調用啊，而且當我調用 delserversession 時，getallserversessionmodel 一樣也被調用了。但是當我把 getallserversessionmodel 獨立成一個類時，這個問題就有莫明奇妙地解決了。獨立出來後的類如下：

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction1 extends ActionSupport {
	// 此處省略屬性的定義及 get/set 方法
	/**
	 * 根據用戶名檢測用戶是否需要驗證碼
	 * 
	 * @return
	 */
	@Action(value = "isneedcapcha", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String checkNeedCapcha() {
		// 省略方法具體業務邏輯
		return SUCCESS;
	}

	@Action(value = "delserversession", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String delServerSessionBySid() {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}
}

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction2 extends ActionSupport {
	// 此處省略屬性的定義及 get/set 方法
	@Action(value = "getallserversessionmodel", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	public String getAllServerSession() throws Exception {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}
}

雖然問題就這樣勉強消失了，但這個問題還是讓人納悶，後來查了資料，發現在 Struts2 中使用 json 插件時， Action 類中所有的以"get"開頭的方法默認都會被序列化，要避免方法被序列化，可以修改方法名不用“get”開頭，或者在方法上加上註解@JSON(serialize = false)聲明不要序列化，問題解決，如下：

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction extends ActionSupport {

	// 此處省略屬性的定義及 get/set 方法

	/**
	 * 根據用戶名檢測用戶是否需要驗證碼
	 * 
	 * @return
	 */
	@Action(value = "isneedcapcha", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	@JSON(serialize = false)
	public String checkNeedCapcha() {
		// 省略方法具體業務邏輯
		return SUCCESS;
	}

	@Action(value = "delserversession", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	@JSON(serialize = false)
	public String delServerSessionBySid() {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}

	@Action(value = "getallserversessionmodel", results = { @Result(name = "success", type = "json", params = {
			"noCache", "true", "contentType", "text/html" }) }, interceptorRefs = {
			@InterceptorRef(value = "defaultStack"),
			@InterceptorRef(value = "json") })
	@JSON(serialize = false)
	public String getAllServerSession() throws Exception {
		// TODO Auto-generated method stub
		// 省略方法具體業務邏輯
		return SUCCESS;
	}
}