通過過濾器和增強request對象解決get提交請求服務器端亂碼。
阿新 • • 發佈：2018-06-28
ride tchar 獲取 cep 增強 servlet code 分享圖片 tro
1.表單用get方式提交
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="/WEB24/encodingServlet" method="get"> <input type="text" name="username"> <input type="submit" value="提交"> </form> </body> </html>
2.創建一個servlet用於獲取表單數據 並輸出
package com.cc.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class EncodingServlet*/ @WebServlet("/encodingServlet") public class EncodingServlet extends HttpServlet { /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String parameter = request.getParameter("username"); System.out.println(parameter); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
3.創建過濾器，並增強request對象解決亂碼
package com.cc.filter; import java.io.IOException; import java.io.UnsupportedEncodingException; 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; public class EncodingFilter implements Filter{ @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO Auto-generated method stub //request.setCharacterEncoding("UTF-8"); //被增強的對象 HttpServletRequest req = (HttpServletRequest) request; EnhanceRequest enhanceRequest = new EnhanceRequest(req); chain.doFilter(enhanceRequest, response); } @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub } @Override public void destroy() { // TODO Auto-generated method stub } class EnhanceRequest extends HttpServletRequestWrapper{ private HttpServletRequest request; public EnhanceRequest(HttpServletRequest request){ super(request); this.request=request; } //對getParameter增強 public String getParameter(String name){ String parameter=request.getParameter(name);//亂碼 try { parameter=new String(parameter.getBytes("iso8859-1"),"UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return parameter; } } }
4.控制臺分別輸出 處理前和處理後的輸出
通過過濾器和增強request對象解決get提交請求服務器端亂碼。