Question

我是struts2的新手。在拦截器中，如何更改表单字段的值，然后将其提交到数据库？例如，当用户在表单中输入firstName值时，则在提交时我想要更改firstName然后将其提交到数据库。

这是我的拦截器代码

public class TestInterceptor extends AbstractInterceptor implements Interceptor
{

    @Override
    public String intercept(ActionInvocation actionInvocation) throws Exception
    {

        ValueStack stack = actionInvocation.getStack();

        Map<String, Object> params = ActionContext.getContext().getParameters();
        Set<String> keys = params.keySet();

        System.out.println(keys + " " + stack.size());

        /*
         * for (String key : keys)
         * {
         * String[] value = (String[]) params.get(key);
         * System.out.println(value.length + " , " + value[0]);
         * }
         */
        Map<String, Object> context = new HashMap<String, Object>();
        context.put("firstNames", "Changed");
        context.put("firstName", "Changed");
        stack.setParameter("firstName", "Changeds");
        stack.push(context);

        String result = actionInvocation.invoke();

        return result;
    }
}

Answer 1

在您的代码中，您只需更改地图中的值即可。无需提出任何其他背景。

Map<String, Object> params = actionInvocation.getInvocationContext().getParameters();
params.put("firstName", "Changed");

Answer 2

尝试一下：

public String intercept(ActionInvocation invocation) throws Exception {
    final ActionContext context = invocation.getInvocationContext();
    Map<String,Object> parameters = (Map<String,Object>)context.get(ActionContext.PARAMETERS);

    Map<String, Object> parametersCopy = new HashMap<String, Object>();
    parametersCopy.putAll(parameters);
    parametersCopy.put("myParam", "changedValue");

    context.put(ActionContext.PARAMETERS, parametersCopy);

    return invocation.invoke();
}

Struts2使用拦截器

2 个答案: