從處理post請求，Reqest Method:OPTIONS錯誤見 javax.servlet.Filter
阿新 • • 發佈：2021-03-28
寫一個demo介面扔到伺服器上，很巧合的遇到這個問題，在處理之後記錄一下。
原因：前端vue axios請求post介面時，用axios進行跨域請求時有時會遇到，這是因為CORS跨域分為 簡單跨域請求和複雜跨域請求；簡單跨域不會發送options請求，複雜跨域會發送一個預檢請求options。Content-Type並非application/x-www-form-urlencoded, multipart/form-data, 或text/plain，請求設定了自定義的header欄位，在header中自定義了欄位就會觸發options預檢請求
處理方法：對照網上解決辦法，在demo里加入了一個過濾器，過濾處理請求header欄位。
package com.daniel.jjmusic.conponet; import org.springframework.stereotype.Component; import javax.servlet.*; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @Component public class SimpleCORSFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletResponse res = (HttpServletResponse)response; res.setHeader("Access-Control-Allow-Origin", "*"); res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); res.setHeader("Access-Control-Max-Age", "3600"); res.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token"); chain.doFilter(request, response); } @Override public void destroy() { } }
擴充套件：建立一個過濾器 Filter 需要實現 javax.servlet.Filter 介面，重寫其中的三個方法。
init()方法只在web容器啟動時執行，具體為因為我加的 @Component 註解，在容器初始化後，批量例項化後，將此類一起例項化，後在初始化階段，執行了該 init() 方法。
destroy() 容器在銷燬過濾器例項前呼叫該方法。
doFilter() 方法進行主要操作呼叫發生在客戶端請求方法與過濾器設定匹配的URL時，Servlet容器將先呼叫過濾器的doFilter方法。FilterChain使用者訪問後續過濾器。在執行的時候，首先是執行doFilter()方法中chain.doFilter()之前的程式碼，然後放棄許可權給下一個過濾器或者serverlet等等，最後才執行chain.doFilter()之後的程式碼。
測試：
於是我又寫了一個過濾器想看看它們之間的關係。程式碼也變成了這個樣子
package com.daniel.jjmusic.conponet;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import java.io.IOException;
@Component
public class TestFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("TestFilter + init()");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("第四步");
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("第五步");
}
@Override
public void destroy() {
System.out.println("TestFilter + destory()");
}
}
package com.daniel.jjmusic.conponet;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
public class SimpleCORSFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("SimpleCORSFilter + init()");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("第一步");
HttpServletResponse res = (HttpServletResponse)response;
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
res.setHeader("Access-Control-Max-Age", "3600");
res.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
chain.doFilter(request, response);
System.out.println("第三步");
}
@Override
public void destroy() {
System.out.println("SimpleCORSFilter + destory()");
}
}
啟動資訊：
"C:\Program Files\Java\jdk1.8.0_181\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:53192,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -javaagent:C:\Users\danie\.IntelliJIdea2019.3\system\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_181\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_181\jre\lib\rt.jar;D:\workspace\idea_workspace\jjmusic\target\classes;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-starter-web\2.4.4\spring-boot-starter-web-2.4.4.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-starter\2.4.4\spring-boot-starter-2.4.4.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot\2.4.4\spring-boot-2.4.4.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-autoconfigure\2.4.4\spring-boot-autoconfigure-2.4.4.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-starter-logging\2.4.4\spring-boot-starter-logging-2.4.4.jar;D:\file\data\maven\maven_3.5.4\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\file\data\maven\maven_3.5.4\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\file\data\maven\maven_3.5.4\org\apache\logging\log4j\log4j-to-slf4j\2.13.3\log4j-to-slf4j-2.13.3.jar;D:\file\data\maven\maven_3.5.4\org\apache\logging\log4j\log4j-api\2.13.3\log4j-api-2.13.3.jar;D:\file\data\maven\maven_3.5.4\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;D:\file\data\maven\maven_3.5.4\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\file\data\maven\maven_3.5.4\org\yaml\snakeyaml\1.27\snakeyaml-1.27.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-starter-json\2.4.4\spring-boot-starter-json-2.4.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\core\jackson-databind\2.11.4\jackson-databind-2.11.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\core\jackson-annotations\2.11.4\jackson-annotations-2.11.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\core\jackson-core\2.11.4\jackson-core-2.11.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.11.4\jackson-datatype-jdk8-2.11.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.11.4\jackson-datatype-jsr310-2.11.4.jar;D:\file\data\maven\maven_3.5.4\com\fasterxml\jackson\module\jackson-module-parameter-names\2.11.4\jackson-module-parameter-names-2.11.4.jar;D:\file\data\maven\maven_3.5.4\org\springframework\boot\spring-boot-starter-tomcat\2.4.4\spring-boot-starter-tomcat-2.4.4.jar;D:\file\data\maven\maven_3.5.4\org\apache\tomcat\embed\tomcat-embed-core\9.0.44\tomcat-embed-core-9.0.44.jar;D:\file\data\maven\maven_3.5.4\org\glassfish\jakarta.el\3.0.3\jakarta.el-3.0.3.jar;D:\file\data\maven\maven_3.5.4\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.44\tomcat-embed-websocket-9.0.44.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-web\5.3.5\spring-web-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-beans\5.3.5\spring-beans-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-webmvc\5.3.5\spring-webmvc-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-aop\5.3.5\spring-aop-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-context\5.3.5\spring-context-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-expression\5.3.5\spring-expression-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-core\5.3.5\spring-core-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\springframework\spring-jcl\5.3.5\spring-jcl-5.3.5.jar;D:\file\data\maven\maven_3.5.4\org\projectlombok\lombok\1.16.18\lombok-1.16.18.jar;D:\software\devTools\idea\IntelliJ IDEA 2019.3.4\lib\idea_rt.jar" com.daniel.jjmusic.JjmusicApplication
Connected to the target VM, address: '127.0.0.1:53192', transport: 'socket'
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.4.4)
2021-03-26 15:21:03.371 INFO 908 --- [ main] com.daniel.jjmusic.JjmusicApplication : Starting JjmusicApplication using Java 1.8.0_181 on DESKTOP-MQQDPHE with PID 908 (D:\workspace\idea_workspace\jjmusic\target\classes started by danie in D:\workspace\idea_workspace\jjmusic)
2021-03-26 15:21:03.376 INFO 908 --- [ main] com.daniel.jjmusic.JjmusicApplication : No active profile set, falling back to default profiles: default
2021-03-26 15:21:04.749 INFO 908 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-03-26 15:21:04.760 INFO 908 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-03-26 15:21:04.761 INFO 908 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.44]
2021-03-26 15:21:04.941 INFO 908 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-03-26 15:21:04.941 INFO 908 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1479 ms
TestFilter + init()
SimpleCORSFilter + init()
2021-03-26 15:21:05.171 INFO 908 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-03-26 15:21:05.401 INFO 908 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-03-26 15:21:05.413 INFO 908 --- [ main] com.daniel.jjmusic.JjmusicApplication : Started JjmusicApplication in 2.875 seconds (JVM running for 4.801)訪問hello介面：
順序是先走了SimpleCORSFilter.doFilter() 的前半部分，又走了 TestFilter.doFilter() 的前半部分，然後執行 hello 介面邏輯，再執行 TestFilter.doFilter() 的後半部分，最後走SimpleCORSFilter.doFilter() 的後半部分，這個執行的順序感覺與壓棧出棧頗有類似，等我繼續探尋。
停止資訊：
Disconnected from the target VM, address: '127.0.0.1:53192', transport: 'socket'
TestFilter + destory()
SimpleCORSFilter + destory()
2021-03-26 15:34:39.994 INFO 908 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
Process finished with exit code 130指定順序：
分別在 TestFilter 指定@Order(1)
在SimpleCORSFilter 指定@Order(2)
訪問 hello 介面，可以用 order 指定過濾器的執行順序，數字越小排在越外邊（前面）
