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一、目的：

JS客户端在编写程序时，可以像调用本地方法一样调用服务器端的Spring中Bean的方法，实现对Spring的动态调用，从而减少客户端的每个请求都要配置成action的麻烦，使业务模块的开发只关注业务逻辑的展示页面的开发。

二、设计思路：
1.服务器端利用Struts机制，提供统一的动态action，名称为DynamicAjaxAction，接收客户端的请求，并返回处理结果；

2.DynamicAjaxAction内部解析请求后，通过java反射机制动态调用spring中的baen方法；

3.客户端封装异步请求方法，提供调用接口；

总体架构如下示意图：

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三、详细设计：

1.DynamicAjaxAction的设计：

public class DynamicAjaxAction extends ActionSupport {

private ActionInvoker actionInvoker;

private DynamicAjaxActionRouting routing;

private static final Log log = LogFactory.getLog(DynamicAjaxAction.class);

protected static ArrayList<String> ExcludeValues = new ArrayList<String>();

 

public DynamicAjaxAction() {

ExcludeValues.add("_de");

ExcludeValues.add("serviceUrl");

ExcludeValues.add("cacheData");

}

 

public String execute() throws Exception {

log.debug("DynamicAjaxAction.execute");

String key = this.getServiceUrl();

Map<String, Object> session = ServletActionContext.getContext().getSession();

HttpServletResponse response = ServletActionContext.getResponse();

 

data = this.invokerAction();

if(data == null) ExtObject.writeJsonString(response, (new ExtResultObject(true)).toString());

else ExtObject.writeJsonString(response, data.toString());

 

return null;

}

 

protected Object invokerAction() throws Exception {

Object[] params = this.getInvokerParams().toArray();

Object obj = actionInvoker.invokerAction(this.getRouting().getServiceName(),

this.getRouting().getActionName(), params);

 

return obj;

}

 

private String getServiceUrl() {

HttpServletRequest request = ServletActionContext.getRequest();

String serviceUrl = request.getParameter("serviceUrl");

 

return serviceUrl;

}

 

private boolean isCacheData() {

HttpServletRequest request = ServletActionContext.getRequest();

String serviceUrl = request.getParameter("cacheData");

if(StringUtility.isNullOrEmpty(serviceUrl)) return false;

return serviceUrl.equals("true");

}

 

protected DynamicAjaxActionRouting getRouting() {

String serviceUrl = this.getServiceUrl();

routing = new DynamicAjaxActionRouting(serviceUrl);

return routing;

}

 

@SuppressWarnings("unchecked")

protected HashMap<String, Object> getRequestParams() {

HttpServletRequest request = ServletActionContext.getRequest();

 

HashMap<String, Object> requestParams = new HashMap<String, Object>();

Object[] params = request.getParameterMap().keySet().toArray();

for(int i = params.length; i > 0; i --) {

String item = params[i - 1].toString();

 

 

if(!ExcludeValues.contains(item)) {

String[] value = request.getParameterValues(item);

 

if(value.length == 0) {

//do nothing

} else if(value.length == 1) {

requestParams.put(item, value[0]);

} else {

requestParams.put(item, value);

}

}

}

 

return requestParams;

}

 

@SuppressWarnings("unchecked")

protected ArrayList getInvokerParams() {

HttpServletRequest request = ServletActionContext.getRequest();

ArrayList requestParams = new ArrayList();

requestParams.addAll(this.getRouting().g