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Java 如何在SpringMVC中解析HTTP 404状态？

java mysql hibernate spring-mvc

Java 如何在SpringMVC中解析HTTP 404状态？,java,mysql,hibernate,spring-mvc,Java,Mysql,Hibernate,Spring Mvc,在试图理解我做错了什么之后，我几乎一整天都在放弃。 好像我在stackoverflow上找到的所有东西我都试过了，但我无法让它全部工作。 我在eclipse中设置并准备了一个简单的SpringMVC+Maven+Hibernate教程，剩下的就是实际运行它并看到结果：（无论我尝试什么链接，我都会收到HTTP404错误 以下是我的设置： web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5"

在试图理解我做错了什么之后，我几乎一整天都在放弃。 好像我在stackoverflow上找到的所有东西我都试过了，但我无法让它全部工作。 我在eclipse中设置并准备了一个简单的SpringMVC+Maven+Hibernate教程，剩下的就是实际运行它并看到结果：（无论我尝试什么链接，我都会收到HTTP404错误

以下是我的设置：

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

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

</web-app>

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans"
  xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
  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.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"> 

    <!-- Enable @Controller annotation support -->
    <mvc:annotation-driven />

    <!-- Map simple view name such as "test" into /WEB-INF/test.jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- Scan classpath for annotations (eg: @Service, @Repository etc) -->
    <context:component-scan base-package="com.tutorial.pizzashop"/>

    <!-- JDBC Data Source. It is assumed you have MySQL running on localhost port 3306 with 
       username root and blank password. Change below if it's not the case -->
    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/pizzashop"/> 
        <property name="username" value="root"/>
        <property name="password" value="discover"/>
        <property name="validationQuery" value="SELECT 1"/>
    </bean>

    <!-- Hibernate Session Factory -->
    <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        <property name="packagesToScan">
        <array>
            <value>com.tutorial.pizzashop</value>
        </array>
        </property>
        <property name="hibernateProperties">
        <value>
            hibernate.dialect=org.hibernate.dialect.MySQLDialect
        </value>
        </property>
    </bean>

    <!-- Hibernate Transaction Manager -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory"/>
    </bean>

    <!-- Activates annotation based transaction management -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pizzashop</title>
</head>
<body>
    <h1>List of all Pizzas</h1>
    <ul>
        <c:forEach var="p" items="${pizzas}">
            <li>${p.id} - ${p.name} : ${p.price}</li>
        </c:forEach>
    </ul>
</body>
</html>

package com.tutorial.pizzashop;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/")
public class PizzaController {
    @Autowired
    private PizzaDAO pizzaDAO;

    /**
     * This handler method is invoked when http://localhost:8080/pizzashop is
     * requested. The method returns view name "index" which will be resolved
     * into /WEB-INF/index.jsp. See src/main/webapp/WEB-INF/servlet-context.xml
     */
    @RequestMapping(method = RequestMethod.GET)
    public String list(Model model) {
        List<Pizza> pizzas = pizzaDAO.findAll();
        model.addAttribute("pizzas", pizzas);
        return "index";
    }
}

package com.tutorial.pizzashop;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@SuppressWarnings({ "unchecked", "rawtypes" })
public class PizzaDAO {
    @Autowired
    private SessionFactory sessionFactory;

    /**
     * @Transactional annotation below will trigger Spring Hibernate transaction
     *                manager to automatically create a hibernate session. See
     *                src/main/webapp/WEB-INF/servlet-context.xml
     */
    @Transactional
    public List<Pizza> findAll() {
        Session session = sessionFactory.getCurrentSession();
        List pizzas = session.createQuery("from Pizza").list();
        return pizzas;
    }
}

package com.tutorial.pizzashop;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "PIZZAS")
public class Pizza {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    private double price;

//getters and setters...
}

index.jsp

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

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

</web-app>

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans"
  xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
  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.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"> 

    <!-- Enable @Controller annotation support -->
    <mvc:annotation-driven />

    <!-- Map simple view name such as "test" into /WEB-INF/test.jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- Scan classpath for annotations (eg: @Service, @Repository etc) -->
    <context:component-scan base-package="com.tutorial.pizzashop"/>

    <!-- JDBC Data Source. It is assumed you have MySQL running on localhost port 3306 with 
       username root and blank password. Change below if it's not the case -->
    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/pizzashop"/> 
        <property name="username" value="root"/>
        <property name="password" value="discover"/>
        <property name="validationQuery" value="SELECT 1"/>
    </bean>

    <!-- Hibernate Session Factory -->
    <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        <property name="packagesToScan">
        <array>
            <value>com.tutorial.pizzashop</value>
        </array>
        </property>
        <property name="hibernateProperties">
        <value>
            hibernate.dialect=org.hibernate.dialect.MySQLDialect
        </value>
        </property>
    </bean>

    <!-- Hibernate Transaction Manager -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory"/>
    </bean>

    <!-- Activates annotation based transaction management -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pizzashop</title>
</head>
<body>
    <h1>List of all Pizzas</h1>
    <ul>
        <c:forEach var="p" items="${pizzas}">
            <li>${p.id} - ${p.name} : ${p.price}</li>
        </c:forEach>
    </ul>
</body>
</html>

package com.tutorial.pizzashop;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/")
public class PizzaController {
    @Autowired
    private PizzaDAO pizzaDAO;

    /**
     * This handler method is invoked when http://localhost:8080/pizzashop is
     * requested. The method returns view name "index" which will be resolved
     * into /WEB-INF/index.jsp. See src/main/webapp/WEB-INF/servlet-context.xml
     */
    @RequestMapping(method = RequestMethod.GET)
    public String list(Model model) {
        List<Pizza> pizzas = pizzaDAO.findAll();
        model.addAttribute("pizzas", pizzas);
        return "index";
    }
}

package com.tutorial.pizzashop;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@SuppressWarnings({ "unchecked", "rawtypes" })
public class PizzaDAO {
    @Autowired
    private SessionFactory sessionFactory;

    /**
     * @Transactional annotation below will trigger Spring Hibernate transaction
     *                manager to automatically create a hibernate session. See
     *                src/main/webapp/WEB-INF/servlet-context.xml
     */
    @Transactional
    public List<Pizza> findAll() {
        Session session = sessionFactory.getCurrentSession();
        List pizzas = session.createQuery("from Pizza").list();
        return pizzas;
    }
}

package com.tutorial.pizzashop;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "PIZZAS")
public class Pizza {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    private double price;

//getters and setters...
}

PizzaDAO.java

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

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

</web-app>

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans"
  xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
  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.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"> 

    <!-- Enable @Controller annotation support -->
    <mvc:annotation-driven />

    <!-- Map simple view name such as "test" into /WEB-INF/test.jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- Scan classpath for annotations (eg: @Service, @Repository etc) -->
    <context:component-scan base-package="com.tutorial.pizzashop"/>

    <!-- JDBC Data Source. It is assumed you have MySQL running on localhost port 3306 with 
       username root and blank password. Change below if it's not the case -->
    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/pizzashop"/> 
        <property name="username" value="root"/>
        <property name="password" value="discover"/>
        <property name="validationQuery" value="SELECT 1"/>
    </bean>

    <!-- Hibernate Session Factory -->
    <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        <property name="packagesToScan">
        <array>
            <value>com.tutorial.pizzashop</value>
        </array>
        </property>
        <property name="hibernateProperties">
        <value>
            hibernate.dialect=org.hibernate.dialect.MySQLDialect
        </value>
        </property>
    </bean>

    <!-- Hibernate Transaction Manager -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory"/>
    </bean>

    <!-- Activates annotation based transaction management -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pizzashop</title>
</head>
<body>
    <h1>List of all Pizzas</h1>
    <ul>
        <c:forEach var="p" items="${pizzas}">
            <li>${p.id} - ${p.name} : ${p.price}</li>
        </c:forEach>
    </ul>
</body>
</html>

package com.tutorial.pizzashop;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/")
public class PizzaController {
    @Autowired
    private PizzaDAO pizzaDAO;

    /**
     * This handler method is invoked when http://localhost:8080/pizzashop is
     * requested. The method returns view name "index" which will be resolved
     * into /WEB-INF/index.jsp. See src/main/webapp/WEB-INF/servlet-context.xml
     */
    @RequestMapping(method = RequestMethod.GET)
    public String list(Model model) {
        List<Pizza> pizzas = pizzaDAO.findAll();
        model.addAttribute("pizzas", pizzas);
        return "index";
    }
}

package com.tutorial.pizzashop;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@SuppressWarnings({ "unchecked", "rawtypes" })
public class PizzaDAO {
    @Autowired
    private SessionFactory sessionFactory;

    /**
     * @Transactional annotation below will trigger Spring Hibernate transaction
     *                manager to automatically create a hibernate session. See
     *                src/main/webapp/WEB-INF/servlet-context.xml
     */
    @Transactional
    public List<Pizza> findAll() {
        Session session = sessionFactory.getCurrentSession();
        List pizzas = session.createQuery("from Pizza").list();
        return pizzas;
    }
}

package com.tutorial.pizzashop;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "PIZZAS")
public class Pizza {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    private double price;

//getters and setters...
}
我遵循的教程是：

您的应用程序似乎没有部署在根上下文（/）上

请尝试以下URL：

http://localhost:8080/Pizzashop/

您在web.xml中引用的/是应用程序部署到的上下文的根。

我已经在github中创建了带有tomcat插件的spring mvc项目，请尝试以下操作

我找到了原因，因为我似乎在
scr/main/java
目录中没有任何.java文件。相反，出于某种原因，我在
src/test/java
目录中有了.javas。真是个愚蠢的错误。 在我将.java文件移动到
src/main/java
、编译并打包.war之后，我将.war移动到Tomcat
webapps
目录，重新启动服务器并能够运行它：）

或不起作用：（大写字母P？尝试单击tomcat manager应用程序中的第二个链接。在名为“appServlet”的DispatcherServlet中找不到Pizzashop或Pizzashop的映射。在tomcat manager内部单击也不起作用。最后用破折号怎么办？：您的配置似乎没有任何问题，因此我确信它是正确的处理部署应用程序的上下文。您是否在Tomcat中检查了webapps目录？这是您的问题。您是如何构建应用程序的？您应该有一个.war文件，可以将其放置在webapps目录中。该文件包含您的所有资源和代码。如果您使用的是maven，请尝试运行MVN clean install并检查ta文件的目标目录。丑陋的url名称是由于war包名称不是
Pizzashop.war
，而是
Pizzashop-0.0.1-snapshop.war
。这可以在pom.xml中更正