Question

我使用Spring工具套件创建了一个spring mvc maven应用程序，如下所述版本：3.6.4.RELEASE

这是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.mytcg</groupId>
  <artifactId>firstapp</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>firstapp 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-webmvc</artifactId>
        <version>3.2.0.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
        <scope>provided</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>firstapp</finalName>
  </build>
</project>

这是web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<servlet>
<servlet-name>firstappservlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/config/servlet-config.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>firstappservlet</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>


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

这是servlet-config.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:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
    <mvc:annotation-driven/>
    <context:component-scan base-package="com.mytcg.controller"/>


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

<!-- 
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"> </bean>
 -->
</beans>

这是HelloController.java

package com.mytcg.controller;

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


@Controller
public class HelloController {

    @RequestMapping(value ="/greeting" )
    public String sayHell (Model model){

        model.addAttribute("greeting", "Hellooo world");

        return "hello";
    }

}

这是hello.jsp

<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Insert title here</title>
</head>
<body>
<h1>${greeting}</h1>
</body>
</html>

运行后，它会显示＆＃34; Hello World！＆＃34;

但是当我为greeting.html提供以下网址时

http://localhost:8083/firstapp/greeting.html

它给出了以下错误404

Apr 04, 2016 9:40:17 AM org.springframework.web.servlet.DispatcherServlet noHandlerFound
WARNING: No mapping found for HTTP request with URI [/firstapp/greeting.html] in DispatcherServlet with name 'firstappservlet'

Answer 1

您的问题出在您的控制器中。

在你的控制器中@RequestMapping听/问候，但你从http://localhost:8083/firstapp/greeting.html

你的borwser发出一个http请求

你应该用这种方式改变你的控制器：

@Controller
public class HelloController {

    @RequestMapping(value ="/greeting.html" )
    public String sayHell (Model model){

      ...
    }

}

但是我的个人建议是，你不应该将你绑定到特定的实现，你应该使用@RequestMapping方法，因为你以这种方式配置了dispatcherServlet：

<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
 <load-on-startup>1</load-on-startup>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

并为您的网址使用以下模式：http://localhost:8083/firstapp/greeting

我希望这可以帮到你

Answer 2

更改您的public class MyServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse response) throws Exception { String pathToFile = "myimage.jpg"; File file = new File(pathToFile); response.setHeader("Content-Type", "image/jpeg"); response.setHeader("Content-Length", String.valueOf(file.length())); response.setHeader("Content-Disposition", "inline; filename=\"" + file.getName() + "\""); Files.copy(file.toPath(), response.getOutputStream()); response.flushBuffer(); } }，如下所示

web.xml

将<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <load-on-startup>2</load-on-startup> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>之类的xml文件名更改为servlet-config.xml并配置dispatcher-servlet.xml

您的DefaultAnnotationHandlerMapping是

dispatcher-servlet.xml

Spring mvc与maven给noHandlerFound错误

2 个答案: