如何覆盖 spring xml 配置中的 parent 方法？

Question

出于某种原因，我的团队使用 spring XML 配置而不是 Java 配置。当我实施新的 CorsFilter 时，我用谷歌搜索并找到了示例 Java 配置，如下所示：

@Component
public class CorsFilter extends OncePerRequestFilter {

   @Override
   protected void doFilterInternal(final HttpServletRequest request,
                                   final HttpServletResponse response,
                                   final FilterChain filterChain) throws ServletException, IOException {
       response.addHeader("Access-Control-Allow-Origin", "*");
       response
               .addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, PATCH, HEAD, OPTIONS");
       response.addHeader("Access-Control-Allow-Headers",
               "Origin, Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers");
       response.addHeader("Access-Control-Expose-Headers",
               "Access-Control-Allow-Origin, Access-Control-Allow-Credentials");
       response.addHeader("Access-Control-Allow-Credentials", "true");
       response.addIntHeader("Access-Control-Max-Age", 10);
       filterChain.doFilter(request, response);
   }
}

但是如何转换成等价的SpringXML配置呢？我知道我们可以创建一个名为 corsFilter 的 bean 并设置一些属性值。但是如何覆盖 parent 方法并在 XML 配置中执行具有副作用的操作？（比如在上面添加 headers）

Answer 1

如果你想移动springxml里面的所有header配置，你可以在xml里创建一个Map对象，然后设置为[=19] =] 到 CorsFilter 并在 doFilterInternal 方法中读取相同的内容。

//add a spring util namespace xmlns:util="http://www.springframework.org/schema/util
//schemaLocation http://www.springframework.org/schema/util
<util:map id="headerMap" map-class="java.util.HashMap">
    <entry key="Access-Control-Allow-Origin">
        <value>*</value>
    </entry> ....so on
</util:map>

<bean id="corsFilter" class="CorsFilter">
    <property name="header" ref="headerMap"/>
</bean>

public class CorsFilter extends OncePerRequestFilter {
   Map<String,String> header;

   @Override
   protected void doFilterInternal(final HttpServletRequest request,
                                   final HttpServletResponse response,
                                   final FilterChain filterChain) throws ServletException, IOException {
        for(Entry<String,String> entry : header.entrySet()){
          response.addHeader(entry.getKey(), entry.getValue());
        }
       filterChain.doFilter(request, response);
   }
}

如何覆盖 spring xml 配置中的 parent 方法？

How to override parent method in spring xml configuration?

java

xml

spring

javabeans