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Invalid content was found starting with element 'init- param'
在配置Spring前端控制器时,如果按照如下方式配置那么<init-param>标签就会有错误提示Invalid content was found starting with element 'init- param' .
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>WEB-INF/dispatcher-servlet.xml</param-value>
</init-param>
</servlet>
解决方案:
将<load-on-startup>1</load-on-startup> 放在<init-param>标签的后面即可.即
<servlet>
...
<init-param>
...
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
Could not open ServletContext resource
错误信息:Could not open ServletContext resource [/WEB-INF/dispatcher-servlet.xml]
在web.xml中,加载springmvc的配置文件时,如果不指定contextConfigLocation路径,那么默认加载的是/WEB-INF/servlet名称-serlvet.xml（例如dispatcher-servlet.xml , springmvc-servlet.xml）
FileNotFoundException
错误信息: java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist
如果通过maven管理web项目,并且把配置文件放在了resources目录下,那么此时配置applicationContext.xml路径时,需要使用如下方式:
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
<!--<param-value>classpath*:applicationContext.xml</param-value>-->
</context-param>
web.servlet.PageNotFound.noHandlerFound
错误信息:web.servlet.PageNotFound.noHandlerFound No mapping found for HTTP request with URI [/helloworld] in DispatcherServlet with name 'dispatcher'
Stackoverflow问题链接直达 里列举了诸多的可能性原因.我这里当时的原因是:
- Spring扫描包配置问题,导致未扫描到指定的Controller
- 编译文件输出路径问题
form表单提交时类型转换异常
错误信息:Unable to convert string [${createtime}] to class [java.util.Date] for attribute [value]: [Property Editor not registered with the PropertyEditorManager]
需要自定义参数绑定,完成日期类型的转换
1.定义日期转换器
public class CustomDateConverter implements Converter<String,Date> {
public Date convert(String source) {
//实现 将日期串转成日期类型(格式是yyyy-MM-dd HH:mm:ss)
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
//转成直接返回
return simpleDateFormat.parse(source);
} catch (ParseException e) {
e.printStackTrace();
}
//如果参数绑定失败返回null
return null;
}
}
2.dispatcher-servlet.xml中配置转换器
<mvc:annotation-driven conversion-service="conversionService" validator="validator"/>
<!-- 自定义参数绑定-->
<bean id="conversionService"
class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<!-- 转换器 -->
<property name="converters">
<set>
<!-- 日期类型转换 -->
<bean class="controller.converter.CustomDateConverter"/>
</set>
</property>
</bean>
完成!
javax.servlet.http.httpservlet 不存在
将tomcat中lib包里的servlet-api.jar(例如D:\Dev\Tomcat9\lib\servlet-api.jar) 复制到项目中 , 并添加依赖 , 重新build即可.
MultipartException:form表单文件上传失败
错误信息: MultipartException: The current request is not a multipart request
解决方案:
需要在form表单上添加enctype="multipart/form-data属性
<form id="test" action="${pageContext.request.contextPath }/test.action" method="post" enctype="multipart/form-data">
js文件加载失败:XXX.js 404 (Not Found)
在dispatcher-servlet.xml中添加静态资源解析
<!-- 静态资源解析 包括 ：js、css、img、..-->
<mvc:resources location="/js/" mapping="/js/**"/>
标签onclick属性调用js function()方法无效
错误信息:Uncaught ReferenceError: [
function] is not defined at HTMLInputElement.onclick
解决方法:
先添加jquery依赖,再定义另外的script标签,并在其中声明function
<%--引入js的包--%>
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.4.min.js"></script>
<script>
your function...
</script>
HttpMediaTypeNotSupportedException
错误信息:HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported
原因:jackson依赖没有添加完整
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0.pr4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.0.pr4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.0.pr4</version>
</dependency>
配置完整就好了.
