1.解决post请求乱码

(仅供参考)

配置拦截器

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

@WebFilter(
        urlPatterns = "/*",
        initParams = {
                @WebInitParam(name = "ENCODING", value = "UTF-8")
        }
        
)
public class EncodingFilter implements Filter {
    private String encoding = "";

    @Override
    //通过filterConfig获得拦截器初始化参数
    public void init(FilterConfig filterConfig) throws ServletException {
        encoding = filterConfig.getInitParameter("ENCODING");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        request.setCharacterEncoding(encoding);  //解决post请求乱码，setCharacterEncoding请求体有效，对get请求无效
        response.setCharacterEncoding(encoding);
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }

}

或者在web.xml配置

<filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

2.解决get请求乱码

修改tomcat下的server.xml

<Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>