想来问一下，这个为什么中文提交返回到数据库是乱码呀，我已经在post那边第一行加了utf8

package key;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.Part;

@WebServlet("/post-submit")
@MultipartConfig(maxFileSize = 1024 * 1024 * 5)
public class upload_post extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private static final String UPLOAD_DIR = "D:\\熊炀璐\\大学\\绩点课\\Java\\appendix";

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String title = request.getParameter("title");
        String content = request.getParameter("content");
        Part filePart = request.getPart("attachment");
        String filePath = "";
        if (filePart != null && filePart.getSize() > 0 && filePart.getContentType().startsWith("image/")) {
            String fileName = UUID.randomUUID().toString() + "_" + Paths.get(filePart.getSubmittedFileName()).getFileName().toString();
            filePath = UPLOAD_DIR + File.separator + fileName;
            try (InputStream input = filePart.getInputStream();
                 OutputStream output = new FileOutputStream(filePath)) {
                byte[] buffer = new byte[1024 * 8];
                int len;
                while ((len = input.read(buffer)) > -1) {
                    output.write(buffer, 0, len);
                }
            } catch (IOExcep

• 关于该问题，我找了一篇非常好的博客，你可以看看是否有帮助，链接：微服务部署，前端post请求出现UTF-8错误

断点看下数据有没有乱码 再看下数据库编码格式

还没解决嘛？ 你不会说的是这个吧 request.setCharacterEncoding("UTF-8");
这个无法解决你的中文乱码的，你要取实际的数据 重新按 之前说的 过滤器里的处理

debug看下乱码是发生在哪一步的，是不是到数据库的时候乱码的，检查下数据库url上是否添加了 ?useUnicode=true&characterEncoding=UTF-8