SpringMVC中的HttpServletRequestWrapper使用解析

public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper
{
	private final Map<String, String[]> parameterMap;

    /**
     * @param request
     */
    public MyHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        parameterMap = new HashMap<>(request.getParameterMap());
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values = parameterMap.get(name);
        if (values == null) {
            values = super.getParameterValues(name);
        }
        return values;
    }

    public void setParameter(String name,  String ...value) {
        parameterMap.put(name, value);
    }
    }

@Slf4j
@WebFilter(filterName = "myFilter", urlPatterns = {"/**"})
@Component
public class MyFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        log.info("----------MyFilter---------");
        MyHttpServletRequestWrapper MyHttpServletRequest = new MyHttpServletRequestWrapper((HttpServletRequest) request);
        MyHttpServletRequest.setParameter("age", "50");
        chain.doFilter(MyHttpServletRequest, response);
    }
    
}

@RestController
@RequestMapping("wrapper")
@Slf4j
public class RequestWrapperController {

  @RequestMapping("testWrapper")
    public void testWrapper(Integer age, String token) {
        log.info("-----------age :{} ,-------------", age);
        log.info("-----------token :{} ,-------------", token);
    }
}