servlet request.setParameters 方法 自创

由于需求需要，，，，像request.setParameters 一样的方法。所以了，，，，，，简单的写了一个实现方法

/**
    * 设置Parameters 的值
    * @param key
    * @param val
    */
    public void setParameters(String key,String val){
    	Map m = getRequest().getParameterMap();
		java.lang.reflect.Field lockedField;
		try {
			lockedField = m.getClass().getDeclaredField("locked");
			lockedField.setAccessible(true);
			//System.out.println(lockedField.get(m));
			lockedField.set(m, false);
			//System.out.println(lockedField.get(m));
			m.put(key, val);
		} catch (Exception e) {
			log.error(e.getMessage(), e);
		}
	
    }

   

	public void doFilter(ServletRequest servletRequest,
			ServletResponse servletResponse, FilterChain arg2)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) servletRequest;
		HttpServletResponse response = (HttpServletResponse) servletResponse;
		//StringBuffer buffer=request.getRequestURL();
		try {
			ParameterRequestWrapper parameterRequestWrapper = new ParameterRequestWrapper(request);
			arg2.doFilter(parameterRequestWrapper, servletResponse);
		} catch (Exception e) {
			log.error(e.getLocalizedMessage(), e);
			request.setAttribute("exceptionMsg", e);
			request.getRequestDispatcher(errorPage).forward(request, response);
		}
	}

 

public class ParameterRequestWrapper extends HttpServletRequestWrapper {


	public ParameterRequestWrapper(HttpServletRequest request) {
		super(request);
	}

	public String getParameter(String name) {
		String v = super.getParameter(name);
		if(v == null){
			v = (String)getParameterMap().get(name);
		}
	    return v;
	}
}