獲取攔截器中從視圖發送的特定參數

Question

當前使用此代碼在Struts2中獲取Interceptor的參數"csrfPreventionSalt"的值。

任何人都可以告訴直接獲取價值的方法...

public String intercept(ActionInvocation invocation) throws Exception {
    final ActionContext context=invocation.getInvocationContext();
    HttpServletRequest httpReq = ServletActionContext.getRequest();
    String salt ="";

    Map<String, Object> params = (Map<String, Object>)ActionContext.getContext().getParameters();
    Iterator<Entry<String, Object>> it = (Iterator<Entry<String, Object>>)params.entrySet().iterator();
    while(it.hasNext()) {
        Entry<String, Object> entry = it.next();
        if(entry.getKey().equals("csrfPreventionSalt"))
        {
        Object obj = entry.getValue();
        if (obj instanceof String[]){
            String[] strArray = (String[]) obj;
            if (strArray!=null) {
                 salt = strArray[0];
            }
        }
    }
}

Answer 1

假定參數已發送給操作，而不是發送給攔截器。 調用動作時，將創建動作上下文，並將請求中的參數復制到動作上下文。 您可以通過獲取參數

public String intercept(ActionInvocation invocation) throws Exception {
    final ActionContext context = invocation.getInvocationContext(); 
    Map<String, Object> parameters = context.getParameters();
    String[] values = (String[]) parameters.get("csrfPreventionSalt");
    String salt = values[0];
    ...