tomcat开启后servlet里的中文在浏览器中变成"?"

Question

如图，tomcat开启后servlet里的中文在浏览器中变成"?"，但英文是正常显示的，图中所示程序三个“哈”会在浏览器中变成三个“?”是什么情况？

Answer 1

在web.xml里面配置一下这个过滤器应该就OK 了，亲测有用

    <filter-name>encoding</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>
    <init-param>
      <param-name>forceRequestEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>forceResponseEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <param-value>UTF-8</param-value>
</init-param>
<init-param>
  <param-name>forceRequestEncoding</param-name>
  <param-value>true</param-value>
</init-param>
<init-param>
  <param-name>forceResponseEncoding</param-name>
  <param-value>true</param-value>
</init-param>

encoding /* ```xml

```