解决cookie不支持中文

在Cookie中name的值不能使用中文，Value是可以的。但是在Servlet4.0版本之前Cookie中的Value也是不支持中文存储的，如果存储的数据中含有中文，代码会直接出现异常。我们可以通过对含有中文的数据重新进行编码来解决该问题。在Servlet4.0中的Cookie的Value开始支持中文存储。

URLEncoder.encode(“content”,”code”)
将内容按照指定的编码方式做URL编码处理。

URLDecoder.decode(“content”,”code”)
将内容按照指定的编码方式做URL解码处理。

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
public class CreatCookieServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //创建cookie对象
//        Cookie cookie = new Cookie("key","我想回家了");
        Cookie cookie = new Cookie(URLEncoder.encode("老家","utf-8"), URLEncoder.encode("安庆","utf-8"));
        //将cookie写回客户端
        resp.addCookie(cookie);
        PrintWriter printWriter = resp.getWriter();
        printWriter.println("creat cookie success");
        printWriter.flush();
        printWriter.close();
    }
}

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.net.URLEncoder;
public class GetCookieDataServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取cookie对象
        Cookie[] cookies = req.getCookies();
        resp.setContentType("text/plain;charset=utf-8");
        //获取cookie中的数据
        PrintWriter printWriter = resp.getWriter();
        for(int i = 0;i<cookies.length;i++){
            Cookie cookie = cookies[i];
            String name = cookie.getName();
            String value = cookie.getValue();
            printWriter.println(URLDecoder.decode(name,"utf-8") +" "+URLDecoder.decode(value,"utf-8"));
        }
        printWriter.flush();
        printWriter.close();
    }
}