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我需要一个带有spring hibernate和mysql的项目，主页工作正常（它甚至从mysql中获取数据并显示它）但是当我点击添加/编辑或删除按钮时，我收到一个404错误，描述是发送的请求由客户端在语法上不正确。 我的学生Controller.java

package com.joseph.controller;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.joseph.model.Student;
import com.joseph.service.StudentService;

@Controller
public class StudentController {
@Autowired
private StudentService studentService;

@RequestMapping("/index")
public String setupForm(Map<String, Object> map){
    Student student = new Student();
    map.put("student", student);
    map.put("studentList", studentService.getAllStudent());
    return "student";
}

@RequestMapping(value="/student.do", method=RequestMethod.POST)
public String doActions(@ModelAttribute Student student, BindingResult result,   @RequestParam String action, Map<String, Object> map){
//      System.out.println("inside doAction");
    Student studentResult = new Student();
//  System.out.println("after student object");
    switch(action.toLowerCase()){//only in Java7 you can put String in switch
    case "add":
        studentService.add(student);
        studentResult = student;
        System.out.println("Inside case action value is - add");
        break;
    case "edit":
        studentService.edit(student);
        studentResult = student;
        System.out.println("Inside case action value is - edit");
        break;
    case "delete":
        studentService.delete(student.getStudentId());
        studentResult = new Student();
        System.out.println("Inside case action value is - delete");
        break;
    case "search":
        Student searchedStudent = studentService.getStudent(student.getStudentId());
        studentResult = searchedStudent!=null ? searchedStudent : new Student();
        System.out.println("Inside case action value is - search");
        break;
    }
    System.out.println("after switch");
    map.put("student", studentResult);
    map.put("studentList", studentService.getAllStudent());
    return "student";
}}

我的 web.xml 文件是

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web- app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
    <display-name>CRUDWebAppMavenized</display-name>

<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:log4j.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>spring1</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>spring1</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
  <welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>

我的 spring servlet.xml 文件

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee"   xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:p="http://www.springframework.org/schema/p"  xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/aop   http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/context   http://www.springframework.org/schema/context/spring-context.xsd
     http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
     http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
      http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
     http://www.springframework.org/schema/util   http://www.springframework.org/schema/util/spring-util.xsd">



<context:annotation-config />
<context:component-scan base-package="com.joseph" />    


<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
    p:location="/WEB-INF/jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
    </property>
</bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>
<tx:annotation-driven />
<bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

我的 spring1-servlet.xml 文件是

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
    http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">



<context:annotation-config />
<context:component-scan base-package="com.joseph" />    


<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
    p:location="/WEB-INF/jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
    </property>
</bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>
<tx:annotation-driven />
<bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

我的 student.jsp 是

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
 <%@ include file="/WEB-INF/jsp/includes.jsp"%>
 <!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=ISO-8859-1">
  <title>Student Management</title>
   </head>
   <body>
          <h1>Students Data</h1>
 <form:form action="student.do" method="POST" commandName="student">

<table>
    <tr>
        <td>Student ID</td>
        <td><form:input path="studentId" /></td>
    </tr>
    <tr>
        <td>First name</td>
        <td><form:input path="firstname" /></td>
    </tr>
    <tr>
        <td>Last name</td>
        <td><form:input path="lastname" /></td>
    </tr>
    <tr>
        <td>Year Level</td>
        <td><form:input path="yearLevel" /></td>
    </tr>
    <tr>
        <td colspan="2">
            <input type="submit" name="action1" value="Add" />
            <input type="submit" name="action2" value="Edit" />
            <input type="submit" name="action3" value="Delete" />
            <input type="submit" name="action4" value="Search" />
        </td>
    </tr>
</table>
         </form:form>
        <br>
           <table border="1">
       <th>ID</th>
        <th>First name</th>
        <th>Last name</th>
         <th>Year level</th>
            <c:forEach items="${studentList}" var="student">
                    <tr>
                    <td>${student.studentId}</td>
                    <td>${student.firstname}</td>
                 <td>${student.lastname}</td>
               <td>${student.yearLevel}</td>
     </tr>
        </c:forEach >
 </table>
  </body>
 </html>

对这家伙有什么帮助吗？！我的意思是它能够很好地连接到数据库我不知道为什么按钮不起作用

4

1 回答 1

0

我看到以下两个问题：

首要问题：

在您的控制器中，您使用

@RequestMapping(value="/student.do", method=RequestMethod.POST)

但在你的表格中你使用

<form:form action="student.do" method="POST" commandName="student">

你的表格不应该也使用/student.do吗？我怀疑这是因为您指出在尝试添加/更新时收到 404（找不到页面）错误。

第二期：

您使用四个提交按钮，每个按钮都有自己的名称

<input type="submit" name="action1" value="Add" />
<input type="submit" name="action2" value="Edit" />
<input type="submit" name="action3" value="Delete" />
<input type="submit" name="action4" value="Search" />

但是，您的控制器方法的 @RequestParam 假定您将在一个参数中获得值。

public String doActions(@ModelAttribute Student student,
      BindingResult result, 
      @RequestParam String action, //***THIS IS WRONG****
      Map<String, Object> map){

首先，您应该更改它的名称：

      @RequestParam("action") String action,

然后，添加一个隐藏字段<input type="hidden" name="action" />（到四个操作按钮。

关注的第三个可能原因：

尝试摆脱第二个调度程序 servlet，并尽可能只使用一个。因此，请使用默认的一个句柄*.do，因为有些人在使用两个调度程序 servlet 时遇到了问题。我确信它可以工作，但很难使用 SO 远程查明错误。

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

并且，有你所有的@RequestMapping用途.do，例如：index.do和student.do

这个答案是基于我可以从问题中得出的结论。

于 2013-07-13T17:47:25.873 回答