springboot 添加请求头（反射实现）

我会带着你远行 2023-07-17 07:22 8阅读 0赞

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### springboot 添加请求头（反射实现） ###

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**相关类及接口**

**org.apache.catalina.connector.RequestFacade**

public class RequestFacade implements HttpServletRequest {
        protected Request request = null;
        protected static final StringManager sm = StringManager.getManager(RequestFacade.class);
    
        public RequestFacade(Request request) {
            this.request = request;
        }

**org.apache.catalina.connector.Request**

public class Request implements HttpServletRequest {
        private static final Log log = LogFactory.getLog(Request.class);
        protected org.apache.coyote.Request coyoteRequest;

**org.apache.coyote.Request**

public final class Request {
    
        private final MimeHeaders headers = new MimeHeaders();

**org.apache.tomcat.util.http.MimeHeaders**

public class MimeHeaders {
    
    ***************
    相关方法
    
        public void removeHeader(String name) {
        public MessageBytes addValue(String name) {

**org.apache.tomcat.util.buf.MessageBytes**

public final class MessageBytes implements Cloneable, Serializable {
    
        public void setString(String s) {

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**示例**

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**filter 层**

**CustomFilter**

@Component
    public class CustomFilter implements HandlerInterceptor {
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            Map<String,String> map=new HashMap<>();
            map.put("name","瓜田李下");
            addHeader(request,map);
    
            return true;
        }
    
        private void addHeader(HttpServletRequest request, Map<String,String> headerMap){
            if (headerMap==null||headerMap.isEmpty()){
                return;
            }
    
            Class<? extends HttpServletRequest> c=request.getClass();
            System.out.println(c.getName());
    
            try{
                Field requestField=c.getDeclaredField("request");
                requestField.setAccessible(true);
    
                Object o=requestField.get(request);
                Field coyoteRequest=o.getClass().getDeclaredField("coyoteRequest");
                coyoteRequest.setAccessible(true);
    
                Object o2=coyoteRequest.get(o);
                Field headers=o2.getClass().getDeclaredField("headers");
                headers.setAccessible(true);
    
                MimeHeaders mimeHeaders=(MimeHeaders) headers.get(o2);
                for (Map.Entry<String,String> entry:headerMap.entrySet()){
                    mimeHeaders.removeHeader(entry.getKey());
                    mimeHeaders.addValue(entry.getKey()).setString(entry.getValue());
                }
    
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

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**config 层**

**WebMvcConfig**

@Configuration
    public class WebMvcConfig implements WebMvcConfigurer {
    
        @Resource
        private CustomFilter customFilter;
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(customFilter).addPathPatterns("/hello");
        }
    }

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**controller 层**

**HelloController**

@RestController
    public class HelloController {
    
        @RequestMapping("/hello")
        public String hello3(HttpServletRequest request){
            String name=request.getHeader("name");
            if (name!=null){
                System.out.println(name);
            }
    
            return "hello world";
        }
    
    }

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**控制台输出**

org.apache.catalina.connector.RequestFacade
    瓜田李下