java过滤器对所有参数去除前后空格

package cn.com.adtis.cd.saas.web.util; import java.io.IOException; import java.util.Enumeration; import java.util.Map; import java.util.Set; import java.util.Vector; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; import org.springframework.web.util.WebUtils; /** * @author cd_lisc * @describe 参数去除空格并写回 * @date 2018-06-20 */ public class TrimParametersFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest request1 = (HttpServletRequest)request; /** * 页面跳转的参数不作处理，主要是 jsp：param会被HttpServletRequestWrapper 过滤 */ if(WebUtils.isIncludeRequest(request1)||isForwarded(request1)){ chain.doFilter(request1, response); }else{ ModifyParametersWrapper mParametersWrapper = new ModifyParametersWrapper(request1); chain.doFilter(mParametersWrapper, response); } } @Override public void destroy() { // TODO Auto-generated method stub } public static boolean isForwarded(HttpServletRequest request) { return !WebUtils.isIncludeRequest(request) && request.getAttribute("javax.servlet.forward.context_path") != null; } /** * 继承HttpServletRequestWrapper，创建装饰类，以达到修改HttpServletRequest参数的目的 */ private class ModifyParametersWrapper extends HttpServletRequestWrapper { private HttpServletRequest request; public ModifyParametersWrapper(HttpServletRequest request) { super(request); this.request = request; } // 重写几个HttpServletRequestWrapper中的方法 /** * 获取所有参数名 * * @return 返回所有参数名 */ @Override public Enumeration<String> getParameterNames() { return super.getParameterNames(); } /** * 获取指定参数名的值，如果有重复的参数名，则返回第一个的值 接收一般变量 ，如text类型 * * @param name * 指定参数名 * @return 指定参数名的值 */ @Override public String getParameter(String name) { String results = super.getParameter(name); if (results == null){ return modify(request.getParameter(name)); }else { return modify(results); } } /** * 获取指定参数名的所有值的数组，如：checkbox的所有数据 * 接收数组变量 ，如checkobx类型 */ @Override public String[] getParameterValues(String name) { String[] results = super.getParameterValues(name); if (results == null || results.length <= 0) return null; else { int length = results.length; for (int i = 0; i < length; i++) { results[i] = modify(results[i]); } return results; } } /** * 自定义的一个简单修改原参数的方法，即：去除前后空格 * * @param string * 原参数值 * @return 修改之后的值 */ private String modify(String string) { if(string != null){ return string.trim(); } return string; } } }