Java Web中解决乱码的方式

方式一：添加编码过滤器

package com.itmacy.dev.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 编码过滤器
 * @author itmacy
 * @Date 2020/10/21
 */
@WebFilter(urlPatterns = "/*")
public class SetCharacterEncodingFilter implements Filter {
    private String newCharset;
    public void init(FilterConfig filterConfig) throws ServletException {
        if (filterConfig.getInitParameter("newcharset") != null) {
           newCharset = filterConfig.getInitParameter("newcharset");
        }else {
            newCharset = "utf-8";
        }
        System.out.println("过滤器初始化参数：" + newCharset);
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain filterChain) throws IOException, ServletException {
        req.setCharacterEncoding(newCharset); // 统一请求编码
        resp.setContentType("text/html;charset=" + newCharset); // 统一响应编码
        filterChain.doFilter(req,resp);
    }

    public void destroy() {

    }
}

方式二：web.xml文件配置编码过滤器

  <filter>
    <filter-name>SetCharacterEncoding</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>SetCharacterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>