SpringMVC(16):整合mybatis遇到的问题及解决小结

本文主要记录springmvc整合mybatis整合过程中遇到的各种问题和解决方法

遇到的问题

在web.xml中标签报红

参考:
web.xml listener-class is not allowed here
解决:改用2.5的版本
答案节选:
Servlet3.0是J2EE6.0规范的一部分,跟随J2EE6.0一起发布,并且Tomcat7.0已经完全支持Servlet3.0 ; 平时,我们一般使用tomcat6.0,是不能够使用servelt3.0的,tomcat6.0还不能支持那些规范; 至于说,为毛线不能使用lintener-class,是因为在web-app_3_0.xsd结构定义文件中,根本就不提倡这些配置,因为Servlet3.0已经支持注解形式;
当时解决了报红的问题。但后来我其他部分调试好了后,改回3.0也没报错。

BeanCreationException

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in file [D:\intellij\workspace\learnssm-firstssm\target\learnssm-firstssm-1.0-SNAPSHOT\WEB-INF\classes\spring\applicationContext-dao.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:478)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    ....省略
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
      ....省略

是少依赖的问题,输入mvn dependency:tree打依赖树:

D:\intellij\workspace\learnssm-firstssm>mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building learnssm-firstssm 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ learnssm-firstssm ---
[INFO] com.iot.learnssm:learnssm-firstssm:war:1.0-SNAPSHOT
[INFO] +- org.springframework:spring-core:jar:4.2.4.RELEASE:compile
[INFO] |  \- commons-logging:commons-logging:jar:1.2:compile
[INFO] +- org.springframework:spring-webmvc:jar:4.2.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:4.2.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-context:jar:4.2.4.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-aop:jar:4.2.4.RELEASE:compile
[INFO] |  |     \- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  +- org.springframework:spring-expression:jar:4.2.4.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:4.2.4.RELEASE:compile
[INFO] +- org.springframework:spring-jdbc:jar:4.2.4.RELEASE:compile
[INFO] |  \- org.springframework:spring-tx:jar:4.2.4.RELEASE:compile
[INFO] +- mysql:mysql-connector-java:jar:5.1.38:compile
[INFO] +- org.mybatis:mybatis:jar:3.3.1:compile
[INFO] +- org.mybatis:mybatis-spring:jar:1.2.4:compile
[INFO] +- log4j:log4j:jar:1.2.17:compile
[INFO] +- org.slf4j:slf4j-api:jar:1.7.18:compile
[INFO] +- commons-dbcp:commons-dbcp:jar:1.4:compile
[INFO] |  \- commons-pool:commons-pool:jar:1.5.4:compile
[INFO] +- javax.servlet:jstl:jar:1.2:compile
[INFO] \- taglibs:standard:jar:1.1.2:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.956 s
[INFO] Finished at: 2016-03-03T20:06:00+08:00
[INFO] Final Memory: 11M/126M
[INFO] ------------------------------------------------------------------------

少了spring-aspects,spring-core等依赖,加上


    org.springframework
    spring-core
    ${spring.version}



    org.springframework
    spring-orm
    ${spring.version}



    org.springframework
    spring-aspects
    ${spring.version}


 
    org.springframework
    spring-test
    ${spring.version}

spring版本统一设置


    
    4.2.4.RELEASE

mybatis绑定错误

错误:org.apache.ibatis.binding.BindingException: Invalid bound statement

使用了下面的方法检查,都没有解决。排除了包名不同等低级错误。

  • mybatis绑定错误

又找到了oschina一个人的帖子,有个回答感觉靠谱

  • java spring4+mybatis整合报错BindingException Invalid bound statement
    是的,是没有在pom.xml配置build包含 xml,导致target目录下没有userMapper.xml -by 唐小明生
    我一看自己的target目录,发现还真是少mapper.xml文件

我想到了两种解决方案:

  • 方案一:自定义一个插件,绑定某个生命周期,比如compile,然后插件目标的功能是将源码包下的xml文件copy到相应的输出目录。(现有插件是否有已有这个功能,通过简单的配置就能完成?我还不清楚)
  • 方案二:在maven工程的src/main/resource目录下建和mapper接口类相应的包,将每个mapper.xml存在这里
    这里我插件玩的不熟,所以没办法,只能手动在resources目录下建包,把每个mapper.xml手动粘贴进去

解决后如图:

请求参数乱码问题

在web.xml添加post乱码filter



    CharacterEncodingFilter
    org.springframework.web.filter.CharacterEncodingFilter
    
        encoding
        utf-8
    


    CharacterEncodingFilter
    /*

以上可以解决post请求乱码问题。解决后调试如图
对于get请求中文参数出现乱码解决方法有两个:
修改tomcat配置文件添加编码与工程编码一致,如下:

另外一种方法对参数进行重新编码:
String userName = new String(request.getParamter("userName").getBytes("ISO8859-1"),"utf-8")
ISO8859-1是tomcat默认编码,需要将tomcat编码后的内容按utf-8编码

请求参数类型转换问题

编写对应的转换类才行,具体参考前面参数绑定的博文《 springmvc学习笔记(11)-springmvc注解开发之简单参数绑定》

maven平台编码问题

[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!

参考:

  • CSDN博客
  • Maven官网在FAQ

解决:

在pom.xml文件的设置编码即可

  
    UTF-8  
  

json格式数据问题

1.请求是json格式

debug窗里报下面的错误:
org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported
浏览器报下面的错误:
HTTP Status 415 -anddescription The server refused this request because the request entity is in a format not supported by the requested resource for the requested method.

2.请求是key/value格式

debug窗里报下面的错误:
java.lang.IllegalArgumentException: No converter found for return value of type: class com.iot.learnssm.firstssm.po.ItemsCustom
参考stackoverflow的这个链接:
How to return JSON data from spring Controller using @ResponseBody
多加一个依赖jackson-databind(之前只加了jackson-mapper-asl的依赖, 间接依赖jackson-core-asl,但还不够。


    com.fasterxml.jackson.core
    jackson-databind
    2.7.2

还没弄懂但不影响运行的问题

加载spring容器报红

  • web.xml节选
 

    contextConfigLocation
    WEB-INF/classes/spring/applicationContext-*.xml
    
 

/classes/spring/applicationContext-*.xml这部分字会报红,但运行起来没问题。我使用下面的那句 classpath:spring/applicationContext-*.xml不报红.原因不清楚。
加载spring容器报红

这里两种方式都能跑通,但是引用的路径不同:一个是引用的的输出的target目录的classes下的,一个是引用输出的target/learnssm-firstssm-1.0-SNAPSHOT目录(相当于部署的WEBROOT或者叫做webapp),所以我觉得还是用WEB-INF下面那个更好
容器加载文件的选用

参数绑定配置问题

在自定义参数绑定时,spring.xml的配置如下:


    
        
        
            
                
                
           
        
    

其中标签会报红,但不影响运行。去掉标签,也可以运行成功。原因我还不知道,以后阅读源码会研究下这个问题。

maven依赖分析问题

输入mvn dependency:analyze进行依赖分析

[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ learnssm-firstssm ---
[WARNING] Used undeclared dependencies found:
[WARNING]    org.springframework:spring-context:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-web:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-beans:jar:4.2.4.RELEASE:compile
[WARNING] Unused declared dependencies found:
[WARNING]    org.springframework:spring-orm:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-aspects:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-test:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-jdbc:jar:4.2.4.RELEASE:compile
[WARNING]    mysql:mysql-connector-java:jar:5.1.38:compile
[WARNING]    org.mybatis:mybatis-spring:jar:1.2.4:compile
[WARNING]    log4j:log4j:jar:1.2.17:compile
[WARNING]    org.slf4j:slf4j-api:jar:1.7.18:compile
[WARNING]    commons-dbcp:commons-dbcp:jar:1.4:compile
[WARNING]    javax.servlet:jstl:jar:1.2:compile
[WARNING]    taglibs:standard:jar:1.1.2:compile
[WARNING]    org.hibernate:hibernate-validator:jar:5.2.4.Final:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.294 s
[INFO] Finished at: 2016-03-06T16:35:23+08:00
[INFO] Final Memory: 16M/164M
[INFO] ------------------------------------------------------------------------
  • 可以看到里面有:
  • Used undeclared dependencies found:
  • Unused declared dependencies found:
    当时为了解决缺包的问题,看到相关的spring-xxx包就加进去了,具体相互之间的依赖关系也没搞清楚,等我以后阅读spring源码再慢慢改好了。反正多引比少引好点,起码不会报错,顶多工程冗余点。
    至于说使用了未声明的包就不知道为啥了,比如
[WARNING]    org.springframework:spring-context:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-web:jar:4.2.4.RELEASE:compile
[WARNING]    org.springframework:spring-beans:jar:4.2.4.RELEASE:compile

都被org.springframework:spring-webmvc:jar:4.2.4.RELEASE:compile依赖,这点可以从依赖树看到

[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ learnssm-firstssm ---
[INFO] com.iot.learnssm:learnssm-firstssm:war:1.0-SNAPSHOT
[INFO] +- org.springframework:spring-webmvc:jar:4.2.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:4.2.4.RELEASE:compile
[INFO] |  +- org.springframework:spring-context:jar:4.2.4.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-aop:jar:4.2.4.RELEASE:compile
[INFO] |  |     \- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  +- org.springframework:spring-expression:jar:4.2.4.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:4.2.4.RELEASE:compile

总之,上面未解决的问题,我会留意,如果有大神指导原因,请不吝赐教。

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