springmvc web.xml文件配置中文编码过滤器

秒速五厘米 2024-04-01 12:47 74阅读 0赞

**在web.xml文件中，加入以下配置：**

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
             version="4.0">
    
        
        <filter>
            <filter-name>encode</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>encode</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    </web-app>

**查看源码**

三个成员变量：  
encoding 编码  
forceRequestEncoding 默认为false  
forceResponseEncoding 默认为false

public class CharacterEncodingFilter extends OncePerRequestFilter {
        
        @Nullable
        private String encoding;
        private boolean forceRequestEncoding;
        private boolean forceResponseEncoding;
    
        public CharacterEncodingFilter() {
        
            this.forceRequestEncoding = false;
            this.forceResponseEncoding = false;
        }

当设置为true时，分别对请求参数和响应参数进行编码

protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        
            String encoding = this.getEncoding();
            if (encoding != null) {
        
                if (this.isForceRequestEncoding() || request.getCharacterEncoding() == null) {
        
                    request.setCharacterEncoding(encoding);
                }
    
                if (this.isForceResponseEncoding()) {
        
                    response.setCharacterEncoding(encoding);
                }
            }
    
            filterChain.doFilter(request, response);
        }