questions about parsing parameters in request and putting them back in request
get and post follow the method , parsing is normal, but an exception is thrown when a put request is encountered.
put requests request of spring , while tomcat is request of apache . Although they all inherit from HttpServletRequest , they throw a class conversion exception
when converting request .has tried many methods, but all of them are ineffective in the end. the requirement to be realized is that the client passes the parameters, the interceptor parses the parameters and re-assigns them, and the control layer acquires the re-assigned parameters and does the corresponding logic.
this is the initialization assignment
private static Field requestField;
private static Field parametersParsedField;
private static Field coyoteRequestField;
private static Field parametersField;
private static Field hashTabArrField;
.....
try {
Class clazz = Class.forName("org.apache.catalina.connector.RequestFacade");
requestField = clazz.getDeclaredField("request");
requestField.setAccessible(true);
parametersParsedField = requestField.getType().getDeclaredField("parametersParsed");
parametersParsedField.setAccessible(true);
coyoteRequestField = requestField.getType().getDeclaredField("coyoteRequest");
coyoteRequestField.setAccessible(true);
parametersField = coyoteRequestField.getType().getDeclaredField("parameters");
parametersField.setAccessible(true);
hashTabArrField = parametersField.getType().getDeclaredField("paramHashStringArray");
hashTabArrField.setAccessible(true);
} catch (Exception e) {
e.printStackTrace();
} resolve request parameters in this method
Object innerRequest = requestField.get(request);//
parametersParsedField.setBoolean(innerRequest, true);
Object coyoteRequestObject = coyoteRequestField.get(innerRequest);
Object parameterObject = parametersField.get(coyoteRequestObject);