解決全站字符亂碼（POST和GET中文編碼問題）
阿新 • • 發佈：2017-10-03
{} tomcat ont throws turn nco cat doget pro 1 說明
亂碼問題：
- 獲取請求參數中的亂碼問題；
- POST請求：request.setCharacterEncoding(“utf-8”)；
- GET請求：new String(request.getParameter(“xxx”).getBytes(“iso-8859-1”), “utf-8”)；
- Tomcat 8.5.20、Tomcat 9.0.0.M26 默認編碼都是utf-8,所有不出現GET請求亂碼問題，所以不需處理
- 響應的亂碼問題：response.setContextType(“text/html;charset=utf-8”)。
1 package web.filter;
2
3 import javax.servlet.*;
4 import javax.servlet.annotation.WebFilter;
5 import javax.servlet.http.HttpServletRequest;
6 import java.io.IOException;
7
8 @WebFilter(filterName = "EncodingFilter",urlPatterns = "/*")
9 public class EncodingFilter implements Filter {
10 public void destroy() { }
11 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
12 //處理post請求編碼問題
13 req.setCharacterEncoding("utf-8");
14
15 HttpServletRequest request = (HttpServletRequest) req;
16 //處理get請求的編碼問題
17 if ( request.getMethod().equals("GET")){
18 EncodingRequest er = new EncodingRequest(request);
19 chain.doFilter(er, resp);
20 } else {
21 chain.doFilter(req,resp);
22 }
23 }
24 public void init(FilterConfig config) throws ServletException { }
25 }
1 package web.filter;
2
3 import javax.servlet.http.*;
4 import java.io.UnsupportedEncodingException;
5
6 /**
7 * 裝飾request
8 */
9 public class EncodingRequest extends HttpServletRequestWrapper{
10 private HttpServletRequest request ;
11 public EncodingRequest(HttpServletRequest req) {
12 super(req);
13 this.request = req;
14 }
15 public String getParameter(String s) {
16 String value = request.getParameter("s");
17 //處理編碼問題
18 try {
19 value = new String(value.getBytes("iso-8859-1"),"utf-8");
20 } catch (UnsupportedEncodingException e) {
21 throw new RuntimeException(e);
22 }
23 return value;
24 }
25 }
1 package web.servlet;
2
3 import javax.servlet.ServletException;
4 import javax.servlet.annotation.WebServlet;
5 import javax.servlet.http.HttpServlet;
6 import javax.servlet.http.HttpServletRequest;
7 import javax.servlet.http.HttpServletResponse;
8 import java.io.IOException;
9
10 @WebServlet(name = "AServlet",urlPatterns = "/AServlet")
11 public class AServlet extends HttpServlet {
12 protected void doPost(HttpServletRequest request, HttpServletResponse response)
13 throws ServletException, IOException {
14 response.setContentType("text/html;charset=utf-8");
15 String username = request.getParameter("username");
16 response.getWriter().println(username);
17 }
18
19 protected void doGet(HttpServletRequest request, HttpServletResponse response)
20 throws ServletException, IOException {
21 response.setContentType("text/html;charset=utf-8");
22 String username = request.getParameter("username");
23 response.getWriter().println(username);
24 }
25 }
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 3 <html> 4 <head> 5 <title>$Title$</title> 6 </head> 7 <body> 8 <a href="<c:url value=‘/AServlet?username=張三‘/>">點擊這裏</a> 9 <form action="<c:url value=‘/AServlet‘/> " method="post"> 10 用戶名：<input type="text" name="username" value="李四"/> 11 <input type="submit" value="提交"/> 12 </form> 13 </body> 14 </html>
3、當只有POST請求出現亂碼問題時（服務器默認編碼為UTF-8時），可采用以下方法解決：
1 @WebFilter(filterName = "EncodingFilter",urlPatterns = "/*")
2 public class EncodingFilter implements Filter {
3 public void destroy() { }
4 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
5 //處理post請求編碼問題
6 req.setCharacterEncoding("utf-8");
7 chain.doFilter(req,resp);
8 }
9 public void init(FilterConfig config) throws ServletException {}
10 }
1 @WebServlet(name = "AServlet",urlPatterns = "/AServlet")
2 public class AServlet extends HttpServlet {
3 protected void doPost(HttpServletRequest request, HttpServletResponse response)
4 throws ServletException, IOException {
5 response.setContentType("text/html;charset=utf-8");
6 String username = request.getParameter("username");
7 response.getWriter().println(username);
8 }
9
10 protected void doGet(HttpServletRequest request, HttpServletResponse response)
11 throws ServletException, IOException {
12 response.setContentType("text/html;charset=utf-8");
13 String username = request.getParameter("username");
14 response.getWriter().println(username);
15 }
16 }
解決全站字符亂碼（POST和GET中文編碼問題）