Question

我在拦截器中执行Struts2的值栈操作，代码如下：

public String intercept(ActionInvocation actionInvocation) throws Exception {
    String invokeRes = actionInvocation.invoke();
    ValueStack valueStack = actionInvocation.getStack();

    List<Object> shouldCheckFieldValues = Lists.newArrayList();

    List<String> keywords = Lists.newArrayList("哈哈", "头部", "测试");
    RegexKeywordFilter filter = new RegexKeywordFilter();
    filter.add(keywords);
    filter.compile();

    final ReplaceStrategy highLightStrategy = new ReplaceStrategy() {
        @Override
        public String replaceWith(String keyword) {
            return "<span style='background-color:red;'>" + keyword + "</span>";
        }
    };

    Object respObj = valueStack.findValue("resp");

    if (respObj instanceof JoyPageWebDTO) {
        JoyPageWebDTO pageWebDTO = (JoyPageWebDTO) respObj;
        List<?> recordsList = pageWebDTO.getRecords();
        if (CollectionUtils.isNotEmpty(recordsList)) {
            for (Object audit : recordsList) {
                for (Field field : audit.getClass().getDeclaredFields()) {
                    if (field.isAnnotationPresent(AICheck.class)) {
                        boolean fieldIsAccess = field.isAccessible();
                        if (!fieldIsAccess) field.setAccessible(true);

                        Object fieldValue = field.get(audit);
                        if (fieldValue instanceof String && filter.hasKeywords((String) fieldValue)) {
                            String replacedStr = filter.replace((String) fieldValue, highLightStrategy);
                            field.set(audit, replacedStr);
                        }
                        if (!fieldIsAccess) field.setAccessible(false);
                    }
                }
            }
        }
    }
    return invokeRes;
}

拦截前的价值堆叠是：

[http://i.stack.imgur.com/SHqqD.png]

拦截后的价值堆叠是：

[http://i.stack.imgur.com/Ths7m.png]

它的价值已经改变了。但是，真正的返回结果是：

{
"pageIndex": 0,
"pageSize": 30,
"recordCount": 0,
"records": [
 {
  "auditContent": "",
  "auditID": 354,
  "auditStatus": 3,
  "bizStatus": 1,
  "bodyPart": "2",
  "categoryID": 141,
  "city": "上海",
  "desc": "22",
  "duration": 2,
  "forbidden": "2",
  "indications": "2",
  "name": "头部按摩很爽很爽"
 }
]
}

我使用xml配置，代码如下：

<package name="ajax" namespace="/ajax" extends="json-default">
    <interceptors>
        <interceptor name="aiCheck"
                     class="com.dianping.joy.admin.web.interceptor.AICheckInterceptor">
        </interceptor>
        <interceptor-stack name="defaultInterceptorStack">
            <interceptor-ref name="aiCheck" />
            <interceptor-ref name="defaultStack" />
        </interceptor-stack>
    </interceptors>
    <default-interceptor-ref name="defaultInterceptorStack"/>

    <action name="searchJoySpu" class="com.action.SpuSearchAction">
        <result type="json">
            <param name="root">resp</param>
        </result>
    </action>
 </package>

返回结果不会更改。为什么以及如何更改此更改结果？

Answer 1

您在序列化后修改对象，因此JSON包含旧值。

您可以在拦截器中使用PreResultListener来处理执行json结果之前的数据。

PreResultListener

PreResultListener可以影响之间的动作调用   拦截/行动阶段和结果阶段。典型用途包括   切换到不同的Result或以某种方式修改Result或   在Action执行之前，Result个对象。

public class MyInterceptor extends AbstractInterceptor { ... public String intercept(ActionInvocation invocation) throws Exception { invocation.addPreResultListener(new PreResultListener() { public void beforeResult(ActionInvocation invocation, String resultCode) { // perform operation necessary before Result execution } }); } ... }

为什么我不能改变Struts2的valueStack？

1 个答案:

`PreResultListener`