一火的专栏

java实现下载网络图片到本地，直接上代码。

http协议之digest(摘要)认证，详细讲解并附Java SpringBoot源码

Whitelabel Error PageThis application has no explicit mapping for /error, so you are seeing this as a fallback.

DEBUG SMTP: trying to connect to host "smtp.163.com", port 465, isSSL falseDEBUG SMTP: exception reading response, THROW: java.net.SocketTimeoutException: Read timed out

org.springframework.security.authentication.InsufficientAuthenticationException: User must be authenticated with Spring Security before authorization can be completed.

Java实现操作阿里云OSS云存储详解，含配置和完整代码

org.apache.tomcat.util.http.fileupload.IOUtils是tomcat中自带的tomca-coyote.jar中的类

从地址中如何提取或者识别街道？

java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.AnnotationIntrospector$XmlExtensions

Aug 28 13:33:12 ecs-demo systemd[1873387]: eye.service: Failed to execute command: Permission deniedAug 28 13:33:12 ecs-demo systemd[1873387]: eye.service: Failed at step EXEC spawning /app/znzm/eye/eye.jar: Permiss>

HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@7df9ca28 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.

[ERROR] Exception occured. Channel: [id: 0x60dbc204, L:/192.168.0.107:64658 - R:104.115.158.104/104.115.158.104:6379] - 2022-08-09 22:25:28,352 [redisson-netty-2-7] org.redisson.client.handler.CommandsQueue(exceptionCaught,153) java.io.IOException: 远程主机强迫

Exception in thread "main" java.lang.IllegalStateException: Failed to get nested archive for entry BOOT-INF/lib/mybatis-plus-support-2.3.2.jar

SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

Java实现下载文件功能到本地电脑的完整源码

Java读取1272447行数据，存入List中，用时：396毫秒。

Servlet.service() for servlet [dispatcherServlet] in context with path [/resource] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: net/sf/jsqlparser/expression/Function] with root causejava.lang.ClassNotFound

java.lang.NoClassDefFoundError: Could not initialize class com.baomidou.mybatisplus.toolkit.SqlUtils

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Circular view path [index]: would dispatch back to the current handler URL [/index] again. Check your ViewResolver setup! (Hint: This may be the result of an unspeci

Error:(162, 111) java: -source 1.5 中不支持方法引用 (请使用 -source 8 或更高版本以启用方法引用)

Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.dataformat.yaml.YAMLFactory

java: 程序包org.springframework.boot.context.properties不存在的解决方法

Java项目或者APP中，自动检测网络是否正常的实现方法。

ConversionFailedException: Failed to convert from type [java.lang.Object[]] to type [@org.springframework.data.jpa.repository.Query java.util.HashMap] for value

Please set the JAVA_HOME variable in your environment, We need java(x64)!

Please set the ROCKETMQ_HOME variable in your environment!

在windows环境下设置java的环境变量，马上生效

Plugin 'org.springframework.boot:spring-boot-maven-plugin:' not found

java对接阿里短信

ajax请求发送成功但不进success,或者时而进时而不进，情况比较多，大部分是数据格式不对，下面分享一种大家容易忽略，导致时而进时而不进的问题。

Ubuntu 20.04 安装Redis 5.0 cd /app/software apt update apt install redis-server 启动、停止、重启安装完成后Redis会自动启动，可以用systemctl来控制Redis的启动、停止、重启等 # 查看状态 systemctl status redis-server.service # 启动 systemctl start redis-server.s

目录1、通过url下载2、通过 a 标签 download 属性结合 blob 构造函数下载3、通过 js-file-download 插件4、使用fetch下载1、通过url下载即后端提供文件的地址，直接使用浏览器去下载通过window.location.href = 文件路径下载window.location.href = `${location.origin}/operation/ruleImport/template`通过 window.open(ur.

import Cookie from 'js-cookie'界面： <a-button slot="extra" type="primary" @click="exportFile" ><a-icon type="download" />导出</a-button>js方法 exportFile() { fetch('http://.

【现象】导入sql时，报如下错误Error occured at:2022-03-31 15:58:54Line no.:151Error Code: 1153 - Got a packet bigger than 'max_allowed_packet' bytes【解决方法】执行SET GLOBAL max_allowed_packet=150000000;150000000表示是150M左右大小...

微信开发者工具中，git使用，这里就不阐述了，重点说一下创建本地分支并提交到远程git服务器中。1.创建本地分支注意了，新分支名称，下方的输入框是灰色的，是可以输入的，输入新的分支名称，点确认2.提交到远程git服务器还是不会操作的，欢迎留言。...

java 获取包下的所有类,完整Java代码如下：package com.example.demo.util;import java.io.File;import java.io.FileFilter;import java.io.IOException;import java.net.JarURLConnection;import java.net.URL;import java.net.URLDecoder;import java.util.Enumeration;impor

【现象】failed; nested exception is org.springframework.data.mongodb.UncategorizedMongoDbException: Command failed with error 13 (Unauthorized): 'command insert requires authentication' on server localhost:27017. The full response is {"ok": 0.0, "errmsg": "

【现象】Build file 'D:\work\app\build.gradle' line: 2Error resolving plugin [id: 'com.android.application']> Plugin 'com.android.application' is already on the script classpath. Plugins on the script classpath cannot be applied in the plugins {} block.

【现象】Error:Maven Resources Compiler: Maven project configuration required for module 'xxx' isn't available. Compilation of Maven projects is supported only if external build is started from an IDE.【解决方法】

阿里云的通用文字识别-高精版识别接口地址：通用文字识别 - 文字识别（OCR） - 阿里云直接上代码核心代码package com.aliyun.sample;import com.aliyun.tea.*;import com.aliyun.ocr_api20210707.*;import com.aliyun.ocr_api20210707.models.*;import com.aliyun.teaopenapi.*;import com.aliyun.teaopenap