Ajax 请求时莫明执行其它未调用的 Action 的原因及解决方式

最近在一个项目中使用了 Ajax ，后台代码采用了 Annotation 的方式进行注解，为了方便，我把相关的 Ajax 请求的 Action 方法都封到了一个类里面，如下：

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction extends ActionSupport {
// 此处省略属性的定义及 get/set 方法

/**
* 根据用户名检测用户是否需要验证码
*
* @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() {
// 省略方法具体业务逻辑
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
// 省略方法具体业务逻辑
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
// 省略方法具体业务逻辑
return SUCCESS;
}
}

当我调用到 isneedcapcha 这个 Action 时，我发现 getallserversessionmodel 对应的方法也被执行了，但我排查了很久，getallserversessionmodel 这个 Action 我并没有去调用啊，而且当我调用 delserversession 时，getallserversessionmodel 一样也被调用了。但是当我把 getallserversessionmodel 独立成一个类时，这个问题就有莫明奇妙地解决了。独立出来后的类如下：

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction1 extends ActionSupport {
// 此处省略属性的定义及 get/set 方法
/**
* 根据用户名检测用户是否需要验证码
*
* @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() {
// 省略方法具体业务逻辑
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
// 省略方法具体业务逻辑
return SUCCESS;
}
}

@Controller
@Namespace(value = "/session")
@Scope("prototype")
@ParentPackage("json-default")
public class AjaxAction2 extends ActionSupport {
// 此处省略属性的定义及 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
// 省略方法具体业务逻辑
return SUCCESS;
}
}

虽然问题就这样勉强消失了，但这个问题还是让人纳闷，后来查了资料，发现在 Struts2 中使用 json 插件时， Action 类中所有的以"get"开头的方法默认都会被序列化，要避免方法被序列化，可以修改方法名不用“get”开头，或者在方法上加上注解@JSON(serialize = false)声明不要序列化，问题解决，如下：

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

// 此处省略属性的定义及 get/set 方法

/**
* 根据用户名检测用户是否需要验证码
*
* @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() {
// 省略方法具体业务逻辑
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
// 省略方法具体业务逻辑
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
// 省略方法具体业务逻辑
return SUCCESS;
}
}