继承HttpServletRequestWrapper以实现在Filter中修改HttpServletRequest的参数

package cn.zifangsky.filter;import java.io.IOException;import java.util.Enumeration;import java.util.Map;import java.util.Vector;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;import org.springframework.web.filter.OncePerRequestFilter;public class ModifyParametersFilter extends OncePerRequestFilter {@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {ModifyParametersWrapper mParametersWrapper = new ModifyParametersWrapper(request);filterChain.doFilter(mParametersWrapper, response);}/** * 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 Map<String, String[]> parameterMap; // 所有参数的Map集合public ModifyParametersWrapper(HttpServletRequest request) {super(request);parameterMap = request.getParameterMap();}// 重写几个HttpServletRequestWrapper中的方法/** * 获取所有参数名 *  * @return 返回所有参数名 */@Overridepublic Enumeration<String> getParameterNames() {Vector<String> vector = new Vector<String>(parameterMap.keySet());return vector.elements();}/** * 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 */@Overridepublic String getParameter(String name) {String[] results = parameterMap.get(name);if (results == null || results.length <= 0)return null;else {System.out.println("修改之前： " + results[0]);return modify(results[0]);}}/** * 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 */@Overridepublic String[] getParameterValues(String name) {String[] results = parameterMap.get(name);if (results == null || results.length <= 0)return null;else {int length = results.length;for (int i = 0; i < length; i++) {System.out.println("修改之前2： " + results[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：给原来的参数值前面添加了一个修改标志的字符串 *  * @param string *            原参数值 * @return 修改之后的值 */private String modify(String string) {return "Modified: " + string;}}}package cn.zifangsky.filter;import java.io.IOExcep</span></span><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
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