使用mybatis-generator自动生成代码的时候生成的实体类多生成了一个UserWithBLOBS.java的文件，但我的user表没有text类型字段

service能否合起来写，各种相似功能合在一起

在进行mybatis的逆向工程时，我给他连接数据库的url是让他连到task3数据库，然而他却对test数据库中和task3数据库同名的USER表进行了逆向工程

只是知道注入的几种方式，但是不能够理解每种注入方式的实现以及原理，网上查了看的还是很绕，主要是实例太少，求解答

我发现导入lombok包后，可以少写很多代码，但是有的又需要安装插件才能工作，那如果在一个多人合作的项目里，我可否使用lombok。如果能用是否只能用一部分，比如要安装插件才能用的功能就不能用，用maven自动下载的包里的功能就能用。

没有一个好的思路进行服务器的异常的捕捉. 一直捕捉不到.

public interface StudentDao { //增 long add(Student student) throws SQLException; //删 boolean delete(long id) throws SQLException; //改 boolean update(Student student) throws SQLException; //查 //根据名字查询 List<Student> showOneN(String name) throws SQLException; //根据学号查询 Student showOneI(String id_num) throws SQLException; //查询全部 List<Student> showAll() throws SQLException; } <insert id="add" useGeneratedKeys="true" parameterType="com.task1.Student" keyProperty="id"> insert into student_info(create_at,update_at,name,qq,curricular,school_time,college,id_num,report_link,goal,refree)values(#{create_at},#{update_at},#{name},#{qq},#{curricular},#{school_time},#{college},#{id_num},#{report_link},#{goal},#{refree}) </insert> <delete id="delete" parameterType="long"> DELETE FROM student_info WHERE id=#{id} </delete> <update id="update" parameterType="com.task1.Student"> update student_info set id=#{id},create_at=#{create_at},update_at=#{update_at},name=#{name},qq=#{qq},curricular=#{curricular},school_time=#{school_time},college=#{college},report_link=#{report_link},goal=#{goal},refree=#{refree} where id_num=#{id_num} </update> <select id="showAll" resultType="com.task1.Student"> SELECT *from student_info </select> <select id="showOneN" resultType="com.task1.Student"> select * from student_info WHERE NAME =#{name} </select> <select id="showOneI" resultType="com.task1.Student"> SELECT *from student_info WHERE id_num=#{id_num} </select> mybatis的接口方法里的参数类型、返回值类型与mybatis的映射文件里sql语句的parameterType、resultType一定要匹配吗？它们指定的是一个东西的类型吗？为什么要重复去指定参数类型？

log乱码示例： 31-May-2020 16:17:34.353 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.鏈嶅姟鍣ㄧ増鏈�: Apache Tomcat/9.0.35 31-May-2020 16:17:34.355 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鏈嶅姟鍣ㄦ瀯寤�: May 5 2020 20:36:20 UTC 31-May-2020 16:17:34.355 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鏈嶅姟鍣ㄧ増鏈彿(: 9.0.35.0 31-May-2020 16:17:34.355 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鎿嶄綔绯荤粺鍚嶇О: Windows 10 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log OS.鐗堟湰: 10.0 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鏋舵瀯: amd64 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 鐜鍙橀噺: C:\Program Files\Java\jdk1.8.0_231\jre 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Java铏氭嫙鏈虹増鏈�: 1.8.0_231-b11 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM.渚涘簲鍟�: Oracle Corporation 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: C:\Users\owlwinter\.IntelliJIdea2019.3\system\tomcat\Unnamed_Image-Studio_2 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: D:\apache-tomcat-9.0.35 31-May-2020 16:17:34.356 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djava.util.logging.config.file=C:\Users\owlwinter\.IntelliJIdea2019.3\system\tomcat\Unnamed_Image-Studio_2\conf\logging.properties 31-May-2020 16:17:34.357 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager 31-May-2020 16:17:34.357 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcom.sun.management.jmxremote= 31-May-2020 16:17:34.357 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcom.sun.management.jmxremote.port=1099 31-May-2020 16:17:34.357 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcom.sun.management.jmxremote.ssl=false 31-May-2020 16:17:34.357 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcom.sun.management.jmxremote.password.file=C:\Users\owlwinter\.IntelliJIdea2019.3\system\tomcat\Unnamed_Image-Studio_2\jmxremote.password 31-May-2020 16:17:34.358 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcom.sun.management.jmxremote.access.file=C:\Users\owlwinter\.IntelliJIdea2019.3\system\tomcat\Unnamed_Image-Studio_2\jmxremote.access 31-May-2020 16:17:34.358 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djava.rmi.server.hostname=127.0.0.1 31-May-2020 16:17:34.358 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djdk.tls.ephemeralDHKeySize=2048 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djava.protocol.handler.pkgs=org.apache.catalina.webresources 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dignore.endorsed.dirs= 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcatalina.base=C:\Users\owlwinter\.IntelliJIdea2019.3\system\tomcat\Unnamed_Image-Studio_2 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Dcatalina.home=D:\apache-tomcat-9.0.35 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log 鍛戒护琛屽弬鏁帮細-Djava.io.tmpdir=D:\apache-tomcat-9.0.35\temp 31-May-2020 16:17:34.359 淇℃伅 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent 鍦╦ava.library.path:[C:\Program Files\Java\jdk1.8.0_231\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;D:\ProgramData\Anaconda3;D:\ProgramData\Anaconda3\Library\mingw-w64\bin;D:\ProgramData\Anaconda3\Library\usr\bin;D:\ProgramData\Anaconda3\Library\bin;D:\ProgramData\Anaconda3\Scripts;D:\Program Files (x86)\NetSarang\Xftp 6\;D:\Program Files (x86)\NetSarang\Xshell 6\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;D:\Program Files (x86)\Calibre2\;C:\Program Files\Java\jdk1.8.0_231\bin;D:\apache-maven\bin;D:\mysql\bin;D:\Program Files\Git\cmd;D:\Program Files\VisualSVN Server\bin;D:\Program Files\TortoiseSVN\bin;C:\Users\owlwinter\AppData\Local\Microsoft\WindowsApps;D:\Wind\WWT\bin\;C:\Users\owlwinter\AppData\Local\GitHubDesktop\bin;%USERPROFILE%\AppData\Local\Microsoft\WindowsApps;;.]涓婃壘涓嶅埌鍩轰簬APR鐨凙pache Tomcat鏈満搴擄紝璇ュ簱鍏佽鍦ㄧ敓浜х幆澧冧腑鑾峰緱鏈�浣虫�ц兘 31-May-2020 16:17:34.669 淇℃伅 [main] org.apache.coyote.AbstractProtocol.init 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tomcat log乱码截图

我现在的想法是签到单独建一个数据表，记录用户id、签到时间戳或者签到的年月日。 但是这样的话数据表会变得很庞大。 有没有更好的方案。

json传数据报500错误