@component注解的使用
配置响应头的内容。
方式一
直接在拦截器里配置响应头内容。
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/** * 拦截器--用户身份确认。 */ public class RestInterceptor implements HandlerInterceptor { private static final Logger log = LoggerFactory.getLogger(RestInterceptor. class ); private static final String tokenHeader = "Authorization" ;
/** * 返回值：true表示继续流程（如调用下一个拦截器或处理器）；false表示流程中断（如登录检查失败），不会继续调用其他的拦截器或处理器，此时我们需要通过response来产生响应； */ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { log.info( "拦截请求" ); //响应头 response.setHeader( "Access-Control-Allow-Origin" , "*" ); response.setHeader( "Access-Control-Allow-Headers" , "x-requested-with,content-type,authorization" ); response.setHeader( "Access-Control-Allow-Methods" , "POST,GET,OPTIONS" );
if (request.getMethod().equals( "OPTIONS" )){ response.setStatus( 204 ); return true ; } log.info( "调用接口:method=" +request.getParameter( "method" )+ ",params=" +JSON.toJSONString(request.getParameterMap()));
// HandlerMethod handlerMethod = (HandlerMethod)handler; // RequestAuth requestAuth = handlerMethod.getMethodAnnotation(RequestAuth.class); // if(requestAuth!=null && requestAuth.auth()==false){ //非验证API // return true;//跳过验证 // } //验证 // String token = request.getHeader(tokenHeader); // if(token == null || token.equals("")) { // log.info("没有找到token"); // throw new BusinessException(ResMsg.CODE_TOKEN_NOTFOUND, "没有找到token"); // } else { // JWSObject jwsObject = JWSObject.parse(token); // Payload payload = jwsObject.getPayload(); // JSONObject obj = payload.toJSONObject();
// String roleNames = String.valueOf(obj.get("roleNames")); // Authentication auth = new Authentication(); // if(obj.containsKey("platformId")) { // Long platformId = Long.valueOf(String.valueOf(obj.get("platformId"))); // auth.setPlatformId(platformId); // } // if(obj.containsKey("userid")) { // Long userId = Long.valueOf(String.valueOf(obj.get("userid"))); // auth.setUserId(userId); // } // if(obj.containsKey("orgId")) { // Long orgId = Long.valueOf(String.valueOf(obj.get("orgId"))); // auth.setOrgId(orgId); // } // if(obj.containsKey("orgid")) {//为兼容老版本的接口 // String orgid = String.valueOf(obj.get("orgid")); // orgid = orgid.replace(",", ""); // Long orgId = Long.valueOf(orgid); // auth.setOrgId(orgId); // } // auth.setRoleNames(roleNames); // SecurityContext.setContext(auth); // JwtUtil.verify(jwsObject); // } return true ; }
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { //log.info("处理中"); }
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { if (ex != null ) { log.error( "接口处理异常:" +ex); throw ex; } } } |
方式二
使用@component注解，将普通JavaBean实例化到spring容器中。
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public class RestInterceptor implements HandlerInterceptor { private static final Logger log = LoggerFactory.getLogger(RestInterceptor. class ); private static final String tokenHeader = "Authorization" ;
/** * 返回值：true表示继续流程（如调用下一个拦截器或处理器）；false表示流程中断（如登录检查失败），不会继续调用其他的拦截器或处理器，此时我们需要通过response来产生响应； */ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { log.info( "拦截请求" );
if (request.getMethod().equals( "OPTIONS" )){ response.setStatus( 204 ); return true ; } log.info( "调用接口:method=" +request.getParameter( "method" )+ ",params=" +JSON.toJSONString(request.getParameterMap())); return true ; }
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { //log.info("处理中"); }
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { if (ex != null ) { log.error( "接口处理异常:" +ex); throw ex; } } } |
定义 SimpleCORSFilter.java 类, 使用@component注解
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@Component public class SimpleCORSFilter implements Filter { public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) res; response.setHeader( "Access-Control-Allow-Origin" , "*" ); response.setHeader( "Access-Control-Allow-Methods" , "POST, GET, OPTIONS, DELETE" ); response.setHeader( "Access-Control-Max-Age" , "3600" ); response.setHeader( "Access-Control-Allow-Headers" , "x-requested-with,content-type,authorization" ); chain.doFilter(req, res); }
public void init(FilterConfig filterConfig) {} public void destroy() {} } |
两种方式都可以完成响应。
@component注解有什么作用
用一句话概括
被@Component注解标识的类，会被纳入Spring容器中统一管理，好处是什么？一句话概括：你不用自己new了！
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
原文链接：https://blog.csdn.net/qq_38719039/article/details/80540848
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