resin | 易学教程

Java 8 Stream 的终极技巧——Collectors 操作

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1. 前言昨天在 Collection移除元素操作相关的文章中提到了 Collectors 。相信很多同学对这个比较感兴趣，那我们今天就来研究一下 Collectors 。 2. Collectors 的作用 Collectors 是 Java 8 加入的操作类，位于 java.util.stream 包下。它会根据不同的策略将元素收集归纳起来，比如最简单常用的是将元素装入 Map 、 Set 、 List 等可变容器中。特别对于 Java 8 Stream Api 来说非常有用。它提供了 collect() 方法来对 Stream 流进行终结操作派生出基于各种策略的结果集。我们就借助于 Stream 来熟悉一下 Collectors 吧。我们依然用昨天的例子： List<String> servers = new ArrayList<>(); servers.add("Felordcn"); servers.add("Tomcat"); servers.add("Jetty"); servers.add("Undertow"); servers.add("Resin"); 3. Java 8 中 Collectors 的方法 Collectors 提供了一系列的静态方法供我们使用

java.net.SocketException: Broken pipe

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问题 I am getting this for all the database connections from my app server.. This exception occured for couple of hours, then got fixed by itself. Something to do with network connection from the appserver? java.net.SocketException: Broken pipe com.inet.tds.SQLException: java.net.SocketException: Broken pipe java.net.SocketException: Broken pipe at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net

java.awt.Color error

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问题 I have this simple Jsp page: <%@ page language="java" import="java.awt.Color"%> <% Color background = Color.white; %> Which fails with following error: java.lang.NoClassDefFoundError at _text__jsp._jspService(/text.jsp:3) at com.caucho.jsp.JavaPage.service(JavaPage.java:75) at com.caucho.jsp.Page.subservice(Page.java:506) at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182) at com.caucho.server.http.Invocation.service(Invocation.java:315) at com.caucho.server.http

Tomcat 面试题

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1、Tomcat是什么 Tomcat是一个应用服务器，比方说，我有个web项目是想让他运行，就可以在运行在tomcat平台上，如果开启就可以运行访问，如果停掉tomcat服务，那么无法访问了 2、Tomcat的默认端口是多少，怎么修改？ 8080 修改方式：（1）找到Tomcat目录下的conf文件夹（2）进入conf文件夹里面找到server.xml文件（3）打开server.xml文件（4）在server.xml文件里面修改Connector标签中的端口号就行了 port="8080"改成你想要的端口，改port的值 3，怎么在Linux上安装Tomcat 1.先去下载Tomcat的安装包，gz结尾的（代表Linux上的Tomcat） 2.上传到Linux上，解压 3.修改端口考，也可以不修改把，在server.xml修改 4.修改好了之后，你就进入你这个tomcat下的bin目录，输入：./startup.sh 这样就启动成功了。 4.怎么在Linux上上传项目先使用eclipse或IDEA把项目打成.war包，然后上传到Linux服务器，然后把项目放在Tomcat的bin目录下的webapps，在重启Tomcat就行了。 5.Tomcat的目录结构 /bin：存放用于启动和暂停Tomcat的脚本 /conf：存放Tomcat的配置文件 /lib

How to expand single user WebApp to multiple users

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问题 There are a similar threads without a concrete solution and I thought it was better to start a new one. I am facing a situation where I have a WebApp hosted in RESIN (just like Tomcat I guess). So far I have been developing the app using db4o since I'm alone and I needed to complete the app ASAP, I have a DB for users and another DB for app data for a single user (me), now that the app is almost done I'm about to move to postgresql and I am thinking seriously about a DB per user even if the

How do I redirect https:// requests to http:// in resin4.0

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问题 in fact, i got the method for redirect http to https ,as I add a filter in web.xml. such as, <security-constraint> <web-resource-collection> <web-resource-name>SSL</web-resource-name> <url-pattern>/xxx/*</url-pattern> </web-resource-collection> <user-data-constraint> <transport-guarantee>CONFIDENTIAL</transport-guarantee> </user-data-constraint> </security-constraint> in this case, I can make the urls like /xxx/* to be requested in https mode. There are some others urls like /yyy/* which must

Spring Boot war fails to deploy properly on Resin server

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问题 My projects relies on Spring Boot to build standalone executable jar files. It works great for internal testing. However, once we are ready to deployment it to our development environment, applications need to be in a war file so it can be deployed to our Resin server. So I followed the guide (http://spring.io/guides/gs/convert-jar-to-war/) and did the conversion. Then I deployed the war application to a local Resin server and a long series of exceptions occurred. Long story short, I ended up

System.Web.HttpException: Maximum request length exceeded

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问题 I am getting above exception. I have tried many solutions from SO, which didn't work, because most of them are for asp.net . This is part of web.xml of my web app: <servlet> <servlet-name>MainPageServlet</servlet-name> <servlet-class>servlets.MainPageServlet</servlet-class> <multipart-config>  <max-file-size>10485760B</max-file-size>  <max-request-size>10240B</max-request-size>  <file-size-threshold>524288B<

resolving session fixation bug fix in resin app server

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问题 I am using resin app server request.getSession.invalidate();reguest.getSession(true) is not working properly and its not resetting session ID while using Resin. Also I am not able to use request.changeSessionId() as the resin version is not able to use JavaEE7 libraries. Please share your views on how to resolve session fixation with Resin 回答1: Resin 4.0.x doesn't implement Servlet 3.1 API. Resin provides reuse-session-id configuration option that helps control session cookie behaviour. http:

How to set the java.library.path in intelliJ Idea

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问题 Could anyone please help how do I solve this error: Native code library failed to load. java.lang.UnsatisfiedLinkError: no ts-jni in java.library.path I am using IDEA IDE as a first time, and have been using Resin_4.0.37 as a server to test my work. As soon as I start my lcoal server in debug mode it stays for approximately 1-2 mins and then suddenly it drops down and get disconnected by giving me the above error. I have set my Windows environmental variable correctly; and have also did the