AJAX学习笔记4解决乱码问题

AJAX学习笔记3练习_biubiubiu0706的博客-CSDN博客

在Tomcat10来说,AJAX  GET或者POST接收响应都不存在乱码问题

对于Tomcat9来说

前端测试代码

    
    






发送AJAX GET请求,测试乱码问题
发送AJAX POST请求,测试乱码问题

后端测试代码

package com.web;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @author hrui
 * @date 2023/9/4 6:02
 */
@WebServlet("/luanma")
public class AjaxRequestLuanma extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收的中文会不会乱码
        String username = req.getParameter("username");
        System.out.println(username);
        //响应中文会乱码吗
        PrintWriter writer = resp.getWriter();
        writer.print("GET响应");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收的中文会不会乱码
        String username = req.getParameter("username");
        System.out.println(username);
        //响应中文会乱码吗
        PrintWriter writer = resp.getWriter();
        writer.print("POST响应");
    }
}

解决方式

package com.web;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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.sql.ResultSet;

/**
 * @author hrui
 * @date 2023/9/4 6:02
 */
@WebServlet("/luanma")
public class AjaxRequestLuanma extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收的中文会不会乱码
        String username = req.getParameter("username");
        System.out.println(username);
        //响应中文会乱码吗
        resp.setContentType("text/html;charset=utf-8");
        PrintWriter writer = resp.getWriter();
        writer.print("GET响应");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收的中文会不会乱码
        req.setCharacterEncoding("utf-8");//解决body体乱码问题
        String username = req.getParameter("username");
        System.out.println(username);
        //响应中文会乱码吗
        resp.setContentType("text/html;charset=utf-8");
        PrintWriter writer = resp.getWriter();
        writer.print("POST响应");
    }
}