Spring Hibernate與Maven和mysql集成

Question

我需要有一個帶有Spring hibernate和mysql的項目，主頁工作正常（它甚至可以從mysql中獲取數據並顯示它），但是當我單擊“添加/編輯”或“刪除”按鈕時，出現描述為404錯誤的請求已發送客戶在句法上是不正確的。 我的學生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>

我的春天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>

對這個家伙有幫助嗎？ 我的意思是它能夠完美地連接到數據庫，我不知道為什么按鈕不起作用

Answer 1

我看到以下兩個問題：

首要問題：

在您的控制器中，您使用

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

但以您的形式使用

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

您的表格不應該也使用/student.do嗎？ 我懷疑這的唯一原因是因為您已表明嘗試添加/更新時出現404（找不到頁面）錯誤。

第二期：

您使用四個提交按鈕，每個按鈕都有自己的名稱

<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，控制器方法的@RequestParam假定您將在一個參數中獲取該值。

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

首先，您應該更改它的名稱：

      @RequestParam("action") String action, 

然后，第二個添加一個隱藏字段（ <input type="hidden" name="action" /> ）以將action的值傳送到服務器，並確保將其值更新為“ Add”，“ Edit”，“ Delete”通過將點擊處理程序附加到四個操作按鈕來使用Java腳本來進行“或”搜索。

引起關注的第三個原因：

嘗試擺脫第二個調度程序servlet，並盡可能使用一個。 因此，請使用默認的*.do句柄，因為某些人在使用兩個分派器servlet時會遇到問題 。 我確信它可以工作，但是使用SO遠程確定錯誤很困難。

<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>

並且，所有@RequestMapping使用.do ，例如： index.do和student.do

該答案基於我從問題中得出的結論。