用axios前台代码：

 let menus_id = this.$refs.tree.getCheckedKeys(); //菜单id [1,2,3]数组
                this.$axios.get("/api/epidemic/roleMenus/addBath1",{params:{roleid:this.roleid,menusid:menus_id}}).then((result)=>{
                      console.log(result)
                })

后台代码：

@RequestMapping("/addBath1")
	public ResponseObj addBath1(Integer roleid,@RequestParam(value="menusid",required=false) Integer[] menusid) {
		//处理代码。。。。。。。
		return responseObj;
	}

前台报错：

xhr.js?ec6c:178 GET http://localhost:8080/api/epidemic/roleMenus/addBath1?roleid=2&menusid[]=1&menusid[]=101&menusid[]=102&menusid[]=103&menusid[]=104&menusid[]=2&menusid[]=201&menusid[]=202&menusid[]=203&menusid[]=3&menusid[]=301&menusid[]=302&menusid[]=303&menusid[]=304&menusid[]=4&menusid[]=401&menusid[]=402&menusid[]=403&menusid[]=404 400 (Bad Request)
dispatchXhrRequest @ xhr.js?ec6c:178
xhrAdapter @ xhr.js?ec6c:12
dispatchRequest @ dispatchRequest.js?c4bb:52
Promise.then (async)
request @ Axios.js?5e65:61
Axios.<computed> @ Axios.js?5e65:76
wrap @ bind.js?24ff:9
updRoleMenus @ AuthList.vue?e7ca:131
invokeWithErrorHandling @ vue.esm.js?efeb:1863
invoker @ vue.esm.js?efeb:2188
invokeWithErrorHandling @ vue.esm.js?efeb:1863
Vue.$emit @ vue.esm.js?efeb:3897
handleClick @ element-ui.common.js?ccbf:9417
invokeWithErrorHandling @ vue.esm.js?efeb:1863
invoker @ vue.esm.js?efeb:2188
original._wrapper @ vue.esm.js?efeb:7565
createError.js?16d0:16 Uncaught (in promise) Error: Request failed with status code 400
    at createError (createError.js?16d0:16)
    at settle (settle.js?db52:17)
    at XMLHttpRequest.handleLoad (xhr.js?ec6c:61)

百度到后台改为：

@RequestMapping("/addBath1")
	public ResponseObj addBath1(Integer roleid,@RequestParam(value="menusid[]",required=false) Integer[] menusid) {
		//、、、、、、、、
		return responseObj;
	}

请求前台依然报错，这次后台也报错：

java.lang.IllegalArgumentException: Invalid character found in the request target [/epidemic/roleMenus/addBath1?roleid=2&menusid[]=1&menusid[]=101&menusid[]=102&menusid[]=103&menusid[]=104&menusid[]=2&menusid[]=201&menusid[]=202&menusid[]=203&menusid[]=3&menusid[]=301&menusid[]=302&menusid[]=303&menusid[]=304&menusid[]=4&menusid[]=401&menusid[]=402&menusid[]=403&menusid[]=404]. The valid characters are defined in RFC 7230 and RFC 3986
	at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:491) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:260) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.36.jar:9.0.36]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.36.jar:9.0.36]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat-embed-core-9.0.36.jar:9.0.36]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.36.jar:9.0.36]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_121]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.36.jar:9.0.36]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]

后来试了百度的一堆操作，依然没解决，貌似tocmat版本太高？不清楚
最后百般尝试，前台用路径传参：
解决办法：
前台vue传参代码：

 let menus_id = this.$refs.tree.getCheckedKeys(); //菜单id [1,2,3]数组

 this.$axios.get("/api/epidemic/roleMenus/addBath1?roleid="+this.roleid+"&menusid="+menus_id).then((result)=>{
           console.log(result)
           }).catch((err)=>{
               console.log("---出错---！"+err.message)
           })
       },

后台接收：

@RequestMapping("/addBath1")
	public ResponseObj addBath1(Integer roleid,@RequestParam(value="menusid",required=false) Integer[] menusid) {
		//处理代码。。。。。。。
		return responseObj;
	}

通过这样路径传参结果解决问题。。。。