4.5.1.1Reader 和 Writer类

本文介绍了文本流和二进制流的基本概念及主要区别。文本流主要用于处理字符数据,系统会在读写时自动转换换行符;而二进制流则直接处理原始数据,不对数据进行解释或转换。

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  1. ReaderWriter 类是所有字符流类的抽象基类,用于简化对字符串的输入程序编程,即用于读写文本数据

  2. 二进制文件和文本文件的区别

可以分为两种类型:文本流和二进制流。文本流是解释性的,最长可达255 个字符,其中回车/ 换行将被转换为换行符“/n” ,(如果以" 文本" 方式打开一个文件,那么在读字符的时候,系统会把所有的"/r/n" 序列转成"/n" ,在写入时把"/n" 转成"/r/n"            archim ‘s opinion    )。二进制流是非解释性的,一次处理一个字符,并且不转换字符。    

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ibs/jaxb-impl-2.2.3-1.jar"],"parent":{"URLs":["file:/bigdata/server/datax/lib/commons-configuration-1.10.jar","file:/bigdata/server/datax/lib/hamcrest-core-1.3.jar","file:/bigdata/server/datax/lib/httpclient-4.5.13.jar","file:/bigdata/server/datax/lib/groovy-all-2.1.9.jar","file:/bigdata/server/datax/lib/commons-logging-1.1.1.jar","file:/bigdata/server/datax/lib/commons-lang3-3.3.2.jar","file:/bigdata/server/datax/lib/datax-transformer-0.0.1-SNAPSHOT.jar","file:/bigdata/server/datax/lib/logback-core-1.0.13.jar","file:/bigdata/server/datax/lib/janino-2.5.16.jar","file:/bigdata/server/datax/lib/commons-math3-3.1.1.jar","file:/bigdata/server/datax/lib/fluent-hc-4.5.jar","file:/bigdata/server/datax/lib/fastjson2-2.0.23.jar","file:/bigdata/server/datax/lib/datax-core-0.0.1-SNAPSHOT.jar","file:/bigdata/server/datax/lib/slf4j-api-1.7.10.jar","file:/bigdata/server/datax/lib/commons-cli-1.2.jar","file:/bigdata/server/datax/lib/datax-common-0.0.1-SNAPSHOT.jar","file:/bigdata/server/datax/lib/logback-classic-1.0.13.jar","file:/bigdata/server/datax/lib/commons-codec-1.11.jar","file:/bigdata/server/datax/lib/commons-io-2.4.jar","file:/bigdata/server/datax/lib/httpcore-4.4.13.jar","file:/bigdata/server/datax/lib/commons-lang-2.6.jar","file:/bigdata/server/datax/lib/commons-collections-3.2.1.jar","file:/bigdata/server/datax/lib/commons-beanutils-1.9.2.jar","file:/bigdata/server/datax/"],"parent":{"URLs":["file:/root/software/jdk_1.8/jre/lib/ext/cldrdata.jar","file:/root/software/jdk_1.8/jre/lib/ext/jfxrt.jar","file:/root/software/jdk_1.8/jre/lib/ext/jaccess.jar","file:/root/software/jdk_1.8/jre/lib/ext/dnsns.jar","file:/root/software/jdk_1.8/jre/lib/ext/nashorn.jar","file:/root/software/jdk_1.8/jre/lib/ext/sunpkcs11.jar","file:/root/software/jdk_1.8/jre/lib/ext/sunjce_provider.jar","file:/root/software/jdk_1.8/jre/lib/ext/zipfs.jar","file:/root/software/jdk_1.8/jre/lib/ext/sunec.jar","file:/root/software/jdk_1.8/jre/lib/ext/localedata.jar"]}}},"finalParameters":[]} 2025-11-07 17:39:33.225 [job-0] INFO HdfsReader$Job - init() ok and end... 2025-11-07 17:39:33.549 [job-0] ERROR RetryUtil - Exception when calling callable, 异常Msg:Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES) com.alibaba.datax.common.exception.DataXException: Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES) at com.alibaba.datax.common.exception.DataXException.asDataXException(DataXException.java:30) ~[datax-common-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.RdbmsException.asConnException(RdbmsException.java:21) ~[plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil.connect(DBUtil.java:397) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil.connect(DBUtil.java:387) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil.access$000(DBUtil.java:22) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil$3.call(DBUtil.java:322) ~[plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil$3.call(DBUtil.java:319) ~[plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.common.util.RetryUtil$Retry.call(RetryUtil.java:164) ~[datax-common-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.common.util.RetryUtil$Retry.doRetry(RetryUtil.java:111) ~[datax-common-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.common.util.RetryUtil.executeWithRetry(RetryUtil.java:30) [datax-common-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil.getConnection(DBUtil.java:319) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.DBUtil.getConnection(DBUtil.java:303) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.util.JdbcConnectionFactory.getConnecttion(JdbcConnectionFactory.java:27) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.writer.util.OriginalConfPretreatmentUtil.dealColumnConf(OriginalConfPretreatmentUtil.java:106) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.writer.util.OriginalConfPretreatmentUtil.dealColumnConf(OriginalConfPretreatmentUtil.java:147) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.writer.util.OriginalConfPretreatmentUtil.doPretreatment(OriginalConfPretreatmentUtil.java:36) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Job.init(CommonRdbmsWriter.java:42) [plugin-rdbms-util-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.plugin.writer.mysqlwriter.MysqlWriter$Job.init(MysqlWriter.java:31) [mysqlwriter-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.job.JobContainer.initJobWriter(JobContainer.java:704) [datax-core-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.job.JobContainer.init(JobContainer.java:304) [datax-core-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.job.JobContainer.start(JobContainer.java:113) [datax-core-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.Engine.start(Engine.java:86) [datax-core-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.Engine.entry(Engine.java:168) [datax-core-0.0.1-SNAPSHOT.jar:na] at com.alibaba.datax.core.Engine.main(Engine.java:201) [datax-core-0.0.1-SNAPSHOT.jar:na] 2025-11-07 17:39:34.550 [job-0] ERROR RetryUtil - Exception when calling callable, 即将尝试执行第1次重试.本次重试计划等待[1000]ms,实际等待[1000]ms, 异常Msg:[Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES)] 2025-11-07 17:39:36.565 [job-0] ERROR RetryUtil - Exception when calling callable, 即将尝试执行第2次重试.本次重试计划等待[2000]ms,实际等待[2000]ms, 异常Msg:[Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES)] 2025-11-07 17:39:40.581 [job-0] ERROR RetryUtil - Exception when calling callable, 即将尝试执行第3次重试.本次重试计划等待[4000]ms,实际等待[4000]ms, 异常Msg:[Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES)] 2025-11-07 17:39:48.595 [job-0] ERROR RetryUtil - Exception when calling callable, 即将尝试执行第4次重试.本次重试计划等待[8000]ms,实际等待[8001]ms, 异常Msg:[Code:[MYSQLErrCode-01], Description:[数据库用户名或者密码错误,请检查填写的账号密码或者联系DBA确认账号密码是否正确]. - 该数据库用户名为:root 具体错误信息为:java.sql.SQLException: Access denied for user 'root'@'Hadoop02' (using password: YES)]
11-08
智慧医药系统(smart-medicine)是一款采用SpringBoot架构构建的Java Web应用程序。其界面设计简洁而富有现代感,核心特色在于融合了当前前沿的生成式人工智能技术——具体接入了阿里云的通义千问大型语言模型,以此实现智能医疗咨询功能,从而增强系统的技术先进性与实用价值。该系统主要定位为医学知识查询与辅助学习平台,整体功能结构清晰、易于掌握,既适合编程初学者进行技术学习,也可作为院校课程设计或毕业项目的参考实现。 中医舌诊作为传统医学的重要诊断手段,依据舌象的颜色、形状及苔质等特征来辨析生理状况与病理变化。近年来,随着计算科学的进步,人工智能技术逐步渗透到这一传统领域,形成了跨学科的研究与应用方向。所述的中医舌诊系统正是这一方向的实践产物,它运用AI算法对舌象进行自动化分析。系统以SpringBoot为基础框架,该框架依托Java语言,致力于简化Spring应用程序的初始化与开发流程,其突出优势在于能高效构建独立、可投入生产的应用,尤其契合微服务架构与云原生环境,大幅降低了开发者在配置方面的负担。 系统中整合的通义千问大语言模型属于生成式人工智能范畴,通过海量数据训练获得模拟人语言的能力,可在限定领域内生成连贯文本,为用户提供近似专业医生的交互式咨询。该技术的引入有助于提升诊断过程的自动化水平与结果一致性。 在设计与体验层面,本系统强调逻辑明晰与操作简便,旨在降低用户的学习门槛,尤其适合中医知识的入门教学。整体交互模式接近百科全书式查询,功能模块精炼聚焦,因而非常适用于教育场景,例如学术项目展示或毕业设计答辩。通过直观的实践界面,使用者能够更深入地理解中医舌诊的理论与方法。 此外,系统界面遵循简约大气的设计原则,兼顾视觉美感与交互流畅性,以提升用户的专注度与使用意愿。结合AI的数据处理能力,系统可实现对舌象特征的快速提取与实时分析,这不仅为传统诊断方法增添了客观量化维度,也拓展了中医知识传播的途径。借助网络平台,该系统能够突破地域限制,使更多用户便捷地获取专业化的中医健康参考,从而推动传统医学在现代社会的应用与普及。 资源来源于网络分享,仅用于学习交流使用,请勿用于商业,如有侵权请联系我删除!
【掺铒光纤放大器(EDFA)模型】掺铒光纤放大器(EDFA)分析模型的模拟研究(Matlab代码实现)内容概要:本文介绍了掺铒光纤放大器(EDFA)分析模型的模拟研究,并提供了基于Matlab的代码实现方案。通过对EDFA的工作原理、增益特性、噪声系数等关键性能指标进行数学建模与仿真分析,帮助研究人员深入理解其在光通信系统中的作用机制。文档还列举了多个相关科研方向的技术支持内容,涵盖智能优化算法、路径规划、无人机应用、通信与信号处理、电力系统管理等多个领域,展示了Matlab在科学研究与工程仿真中的广泛应用能力。此外,文中附带网盘链接,便于获取完整的代码资源与开发工具包。; 适合人群:具备一定光学通信或电子信息背景,熟悉Matlab编程,从事科研或工程仿真的研究生、高校教师及技术研发人员。; 使用场景及目标:①用于光通信系统中EDFA性能的理论分析与仿真验证;②支持科研人员快速构建测试EDFA模型,提升研究效率;③为教学实验、毕业设计及学术论文复现提供可靠的技术参考与代码基础。; 阅读建议:建议读者结合光通信基础知识,按照文档结构逐步运行并调试Matlab代码,重点关注模型参数设置与仿真结果分析,同时可利用提供的网盘资源拓展学习其他相关课题,深化对系统级仿真的理解。
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