得到错误 404 源服务器没有找到目标资源的当前表示或不愿意透露存在的表示答案

【问题标题】：getting error 404 The origin server did not find a current representation for the target resource or is not willing to disclose that one exists得到错误 404 源服务器没有找到目标资源的当前表示或不愿意透露存在的表示
【发布时间】：2020-06-11 12:39:23
【问题描述】：

我只是在处理无法正常工作的数据流。代码如下：

index.jsp

<html>
  <body>
    <h2>Hello World!</h2>    
    <form action="add">
      <input type = "text" name  = "t1"><br>
      <input type = "text" name  = "t2"><br>
      <input type = "submit">    
    </form>
  </body>
</html>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
  <servlet-name>shivam</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
  </servlet>

  <servlet-mapping>
  <servlet-name>shivam</servlet-name>
  <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

pom.xml

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.springmvc</groupId>
  <artifactId>First_Spring_MVC_project</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>First_Spring_MVC_project Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.2.6.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.6.RELEASE</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.20</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

  </dependencies>
  <build>
    <finalName>First_Spring_MVC_project</finalName>
  </build>
</project>

虽然我创建了一个编写代码的 java 类。 AddController.java

package com.springmvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class AddController
{
    @RequestMapping("add")
    public void add()
    {
        System.out.println("i am here");
    }

}

和 shivam-servlet.xml 文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:ctx="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd ">


    <ctx:annotation-config></ctx:annotation-config>
    <ctx:component-scan base-package="com.springmvc"></ctx:component-scan>
</beans>

错误：

HTTP 状态 404 – 未找到类型状态报告描述来源服务器没有找到目标资源的当前表示或者不愿意透露它的存在。

Apache Tomcat/9.0.34

【问题讨论】：

标签： java spring spring-mvc

【解决方案1】：

删除你的

<ctx:annotation-config></ctx:annotation-config>
    <ctx:component-scan base-package="com.springmvc"></ctx:component-scan>

添加

<!-- Add support for component scanning -->
    <context:component-scan base-package="com.springmvc" />

    <!-- Add support for conversion, formatting and validation support -->
    <mvc:annotation-driven/>

    <!-- Define Spring MVC view resolver -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/view/" />
        <property name="suffix" value=".jsp" />
    </bean>

.. 之后确保在您的 WEB-INF 文件夹中，创建视图文件夹，并在该文件夹中放置您的 jsp 页面（ index.jsp ）

之后从

更改您的控制器

@Controller
public class AddController
{
    @RequestMapping("add")
    public void add()
    {
        System.out.println("i am here");
    }

}

到

 @Controller
@RequestMapping("/")
    public class AddController
    {
        @RequestMapping("/")
        public String add()
        {
            System.out.println("i am here");
    return "index";
        }

    }

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>spring-mvc-crud-demo</display-name>

  <absolute-ordering />

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>

  <servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/shivam-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

你的 shivam-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- Add support for component scanning -->
    <context:component-scan base-package="com.springmvc" />

    <!-- Add support for conversion, formatting and validation support -->
    <mvc:annotation-driven/>

    <!-- Define Spring MVC view resolver -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/view/" />
        <property name="suffix" value=".jsp" />
    </bean>


</beans>

确保您的 web.xml、shivam-servlet.xml 和视图文件夹位于 WEB-INF 中

【讨论】：