idea maven SSM springmvc报错 org.springframework.web.servlet.DispatcherServlet 先500在404,已解决!!!
引文:
在idea,maven项目搭建的SSM框架,遇到的问题是在Controller文件@RequestMapping加好注解,但是开了tomcat运行,一直进入不了Controller,报错500在404
介绍:
最近在学基于maven项目搭建的SSM框架,遇到的问题还挺多,其中搞得最难受的就是这个
org.springframework.web.servlet.DispatcherServlet报错500,在刷新就是报错404,网上也找个很多解决办法,包也都下好了,但是依然不行,最后突然想到好像WEB-INF下的lib没更新包,之前web项目会显示lib文件夹,但是这个maven项目建好web文件,lib就不显示了,然后我试了一下更新lib,就好了,我猜很多人也可能会遇到,也是给自己走过的坑记上一笔。
流程:
一、先保证有pom.xml有导入spring-web的包,以下是我的配置
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hxh</groupId>
<artifactId>SmartStockMavenSSM</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>6</source>
<target>6</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<!-- java ee jar包 -->
<javaee.version>7.0</javaee.version>
<!-- jstl jar包 -->
<jstl.version>1.2</jstl.version>
<!-- mysql-connector包 -->
<mysql.version>8.0.15</mysql.version>
<!-- commons-dbcp -->
<dbcp.version>1.4</dbcp.version>
<!-- mybatis-spring整合包 -->
<mybatis-spring.version>1.3.0</mybatis-spring.version>
<!-- spring版本号 -->
<spring.version>5.1.5.RELEASE</spring.version>
<!-- mybatis版本号 -->
<mybatis.version>3.4.6</mybatis.version>
<!-- jackson版本号 -->
<jackson.verson>2.9.8</jackson.verson>
<!-- junit -->
<junit-version>4.12</junit-version>
<!-- cglib -->
<cglib-version>3.2.2</cglib-version>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.7.25</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<!-- 导入java ee jar 包 -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>${javaee.version}</version>
</dependency>
<!-- JSTL标签类 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<!-- 导入Mysql数据库链接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- dbcp数据库连接池包 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>${dbcp.version}</version>
</dependency>
<!--mybatis-spring整合包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis-spring.version}</version>
</dependency>
<!-- mybatis-核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--spring-核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- jackson包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.verson}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.verson}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.verson}</version>
</dependency>
<!-- fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.58</version>
</dependency>
<!-- 测试包 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit-version}</version>
<scope>test</scope>
</dependency>
<!-- cglib包 -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>${cglib-version}</version>
</dependency>
<!--日志记录的jar包 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>${slf4j.version}</version>
<scope>test</scope>
</dependency>
<!-- aspectjweaver包 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.2</version>
</dependency>
<!-- aspectjrt 包-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.9.2</version>
</dependency>
</dependencies>
</project>
二、web.xml配置,一定要配置对<select-class>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 注册一个前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 这里名字有讲究 如果不去修改spring配置文件默认位置
那么springmvc它会去web-inf下找springmvc-servlet.xml文件
-->
<init-param>
<!-- 上下文配置的位置的指定 -->
<param-name>contextConfigLocation</param-name>
<!-- 下面的 会自动去类路径文件找springmvc.cml -->
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- servlet映射配置 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- 这里同一写斜杠 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
三、还有好多其他的配置,我这不是教学教程,就跳过,直接解决我说的lib更新jar包的图文教程
简洁流程:点击左上角File -> Project Structrue -> Artifacts -> Available Elements右击项目名 -> Put into Output Root -> 检查左边的lib文件是否没有红色报错
下边图文教学
1. 点击左上角FIle
2. 点击Project Structrue
3. 点击Artifacts
4. 在右边有个Available Elements。右击项目名
5. 右击项目名,选择 Put into Output Root选项 会自动导入更新到左边WEB-INF下的lib文件
6. 完成,检查左边lib文件内是否还有红色的文件,如果还有就点击整个lib,在点击上边的减号”-“,然后在重新来一次,就可以了
最后
这是第二次写CSDN,写的依然乱七八糟,希望该表达的意思大家可以理解,如果有什么问题可以在评论中写出来,可以互相交流一下,最后我推荐一个学习SSM框架的视频,很好的教学,谢谢大家的浏览啦!