一、说明

1、springboot版本2.2.13.RELEASE
2、本来是没有乱码，不知道什么时候增加了其他的依赖，即dependency，就导致乱码了
3、配置server.tomcat.uri-encoding=UTF-8，无效
4、配置spring.http.encoding.charset=UTF-8，无效
5、解决：自定义filter处理表单参数
6、我的情况是真神奇，有的接口是utf8，有的接口是8859；恶心坏了；改造了下代码，临时解决下吧

二、copy复制

package com.ruoyi.hg.filter;

import cn.hutool.core.util.ObjectUtil;
import com.ruoyi.common.utils.text.CharsetKit;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Order(Integer.MIN_VALUE)
@Component
public class EncodingFilter extends OncePerRequestFilter {
    private String encoding;

    private boolean forceEncoding = false;

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    public void setForceEncoding(boolean forceEncoding) {
        this.forceEncoding = forceEncoding;
    }

    public String filter(String input) {
        return CharsetKit.convert(input, CharsetKit.ISO_8859_1, CharsetKit.UTF_8);
    }

    @Override
    protected void doFilterInternal(final HttpServletRequest request, HttpServletResponse response,
            FilterChain filterChain) throws ServletException, IOException {
        // 设置request和response的编码格式（解决post请求乱码）

        // 对request中的参数进行编码格式的转换（解决get请求乱码）
        filterChain.doFilter(new HttpServletRequestWrapper(request) {
            @Override
            public String getParameter(String name) {
                String value = super.getParameter(name);
                return check8859(value);
            }

            @Override
            public String[] getParameterValues(String name) {
                String[] values = super.getParameterValues(name);
                if (values == null) {
                    return null;
                }
                String value = null;
                for (int i = 0; i < values.length; i++) {
                    value = values[i];
                    // 不包含，说明转成功了
                    values[i] = check8859(value);
                }
                return values;
            }
        }, response);
    }

    String check8859(String val) {
        if (ObjectUtil.isNull(val)) {
            return val;
        }
        String afterValue = filter(val);
        if (afterValue.contains("?")) {
            // utf8文字，强行通过 ISO_8859_1 -> utf8，会包含问好
            return val;
        }
        // 不包含，说明转成功了
        return afterValue;
    }
}