java web 修改request携带的参数信息

package helloworld; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; import java.util.Vector; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper { Map<String,String[]> params; public MyHttpServletRequestWrapper(HttpServletRequest request, Map inParam) { super(request); // TODO Auto-generated constructor stub params = new HashMap(inParam); } public void setParameter(String key,String value){ params.put(key, new String[]{value}); } public void setParameter(String key,String[] values){ params.put(key, values); } public String getParameter(String name) { Object v = params.get(name); if (v == null) { return null; } else if (v instanceof String[]) { String[] strArr = (String[]) v; if (strArr.length > 0) { return strArr[0]; } else { return null; } } else { return v.toString(); } } @Override public Map<String, String[]> getParameterMap() { return params; } @Override public Enumeration<String> getParameterNames() { Vector l = new Vector(params.keySet()); return l.elements(); } @Override public String[] getParameterValues(String name) { return params.get(name); } }