request通过反射修改参数方法

request通过反射修改参数方法

这种方法parameterMap是变了，但是parameter并没有改变
  Map<String, String[]> parameterMap = request.getParameterMap();
        Field lockedField = parameterMap.getClass().getDeclaredField("locked");
        lockedField.setAccessible(true);//打开访问权限，让他裸奔，private类型照样玩他
        lockedField.setBoolean(parameterMap, false);//将lock参数设置为false了，就是可以修改了
//        parameterMap.put(Constant.GW_APICODE, new String[]{"getCodeCombine"});
//        parameterMap.put(Constant.GW_SYSTEMSOURCE, new String[]{"1"});
//        parameterMap.put(Constant.GW_OKEY, new String[]{"1"});
        lockedField.setBoolean(parameterMap, true);

使用以下方法修改request里的参数

    private Map<String, ArrayList<String>> getRequestMap(ServletRequest request) {
        try {
            Class clazz = ((RequestFacade)request).getClass();
            Field requestField = clazz.getDeclaredField("request");
            requestField.setAccessible(true);

            Field parametersParsedField = requestField.getType().getDeclaredField("parametersParsed");
            parametersParsedField.setAccessible(true);

            Field coyoteRequestField = requestField.getType().getDeclaredField("coyoteRequest");
            coyoteRequestField.setAccessible(true);

            Field parametersField = coyoteRequestField.getType().getDeclaredField("parameters");
            parametersField.setAccessible(true);

            Field hashTabArrField = parametersField.getType().getDeclaredField("paramHashValues");
            hashTabArrField.setAccessible(true);
            Object innerRequest = requestField.get(request);
            parametersParsedField.setBoolean(innerRequest, true);
            Object coyoteRequestObject = coyoteRequestField.get(innerRequest);
            Object parameterObject = parametersField.get(coyoteRequestObject);
            return (Map<String, ArrayList<String>>) hashTabArrField.get(parameterObject);
        } catch (Exception e) {
            e.printStackTrace();
            return Collections.emptyMap();
        }
    }

参考：https://www.jb51.net/article/219435.htm