DAO类
package com.dao;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bin.Student;
import com.repository.StudentRepository;
@Service
public class StudentDAO {
@Autowired
StudentRepository studentRepository;
/*to save an employee*/
public Student save(Student std) {
return studentRepository.save(std);
}
/* search all employees*/
public List<Student> findAll(){
return studentRepository.findAll();
}
/*get an employee by id*/
public Student findOne(Integer id){
return studentRepository.getOne(id);
}
/*delete an employee*/
public void delete(Student std) {
studentRepository.delete(std);
}
}
控制器
package com.controller;
import java.util.ArrayList;
import java.util.List;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import com.bin.Student;
import com.dao.StudentDAO;
@Controller
public class StudentController {
@Autowired
private StudentDAO studentDao;
@RequestMapping(value="/enroll",method=RequestMethod.GET)
public String newRegistration(ModelMap model) {
Student student = new Student();
model.addAttribute("student",student);
return "enroll";
}
@RequestMapping(value="/save",method=RequestMethod.POST)
public String saveRegistration(@Valid Student student,BindingResult result,ModelMap model,RedirectAttributes redirectAttributes) {
if(result.hasErrors()) {
return "enroll";
}
studentDao.save(student);
return "redirect:/viewstudents";
}
@RequestMapping(value="/viewstudents")
public ModelAndView getAll() {
List<Student> list=studentDao.findAll();
return new ModelAndView("viewstudents","list",list);
}
@RequestMapping(value="/editstudent/{id}")
public String edit (@PathVariable int id,ModelMap model) {
Student student=studentDao.findOne(id);
model.addAttribute("student",student);
return "editstudent";
}
@RequestMapping(value="/editsave",method=RequestMethod.POST)
public ModelAndView editsave(@ModelAttribute("student") Student p) {
Student student=studentDao.findOne(p.getId());
student.setFirstName(p.getFirstName());
student.setLastName(p.getLastName());
student.setCountry(p.getCountry());
student.setEmail(p.getEmail());
student.setSection(p.getSection());
student.setSex(p.getSex());
studentDao.save(student);
return new ModelAndView("redirect:/viewstudents");
}
@RequestMapping(value="/deletestudent/{id}",method=RequestMethod.GET)
public ModelAndView delete(@PathVariable int id) {
Student student=studentDao.findOne(id);
studentDao.delete(student);
return new ModelAndView("redirect:/viewstudents");
}
@ModelAttribute("sections")
public List<String> intializeSections(){
List<String> sections = new ArrayList<String>();
sections.add("Graduate");
sections.add("Post Graduate");
sections.add("Reasearch");
return sections;
}
/*
* Method used to populate the country list in view. Note that here you can
* call external systems to provide real data.
*/
@ModelAttribute("countries")
public List<String> initializeCountries() {
List<String> countries = new ArrayList<String>();
countries.add("INDIA");
countries.add("USA");
countries.add("CANADA");
countries.add("FRANCE");
countries.add("GERMANY");
countries.add("ITALY");
countries.add("OTHER");
return countries;
}
}
应用程序类
package com.application;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
@SpringBootApplication
@EnableJpaAuditing
public class StudentApplication {
public static void main(String[] args) {
SpringApplication.run(StudentApplication.class, args);
}
}
application.prprties
spring.mvc.view.prefix : /WEB-INF/views/
spring.mvc.view.suffix: .jsp
## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url = jdbc:mysql://localhost:3306/studentdb?allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username = root
spring.datasource.password = root
## Hibernate Properties
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update
存储库
package com.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.bin.Student;
public interface StudentRepository extends JpaRepository<Student, Integer> {
}
这是我的应用程序后端。我已经做了很多尝试来解决这个问题。请尝试帮助。我需要解决此错误才能部署项目。这将是真正的帮助
body {
background-color: lightblue;
}
h1 {
color: navy;
margin-left: 20px;
}
table {
width:100%;
}
table, th, td {
border-collapse: collapse;
}
th, td {
padding: 5px;
text-align: left;
}
table#t01 tr:nth-child(even) {
background-color: #eee;
}
table#t01 tr:nth-child(odd) {
background-color:#fff;
}
table#t01 th {
background-color: blue;
color: white;
text-align: center;
}
table#t02 td {
vertical-align: inherit;
text-align: center;
}
table#t02 tr:nth-child(even) {
background-color: #eee;
}
table#t02 tr:nth-child(odd) {
background-color:#fff;
}
table#t02 th {
background-color: lightblue;
text-align: center;
}
h1 {
text-align: center;
display: block;
font-size: 2em;
margin-top: 0.67em;
margin-bottom: 0.67em;
margin-left: 0;
margin-right: 0;
font-weight: bold;
color:blue;
}
h2 {
text-align: left;
display: block;
font-size: 1em;
margin-top: 0.67em;
margin-bottom: 0.67em;
margin-left: 0;
margin-right: 0;
font-weight: bold;
color:#008040;
}
a {
font-weight: bold;
color:blue;
}
body {
background-color: lightblue;
}
h1 {
color: navy;
margin-left: 20px;
}
table {
width:100%;
}
table, th, td {
border-collapse: collapse;
}
th, td {
padding: 5px;
text-align: left;
}
table#t01 tr:nth-child(even) {
background-color: #eee;
}
table#t01 tr:nth-child(odd) {
background-color:#fff;
}
table#t01 th {
background-color: blue;
color: white;
text-align: center;
}
table#t02 td {
vertical-align: inherit;
text-align: center;
}
table#t02 tr:nth-child(even) {
background-color: #eee;
}
table#t02 tr:nth-child(odd) {
background-color:#fff;
}
table#t02 th {
background-color: lightblue;
text-align: center;
}
h1 {
text-align: center;
display: block;
font-size: 2em;
margin-top: 0.67em;
margin-bottom: 0.67em;
margin-left: 0;
margin-right: 0;
font-weight: bold;
color:blue;
}
h2 {
text-align: left;
display: block;
font-size: 1em;
margin-top: 0.67em;
margin-bottom: 0.67em;
margin-left: 0;
margin-right: 0;
font-weight: bold;
color:#008040;
}
a {
font-weight: bold;
color:blue;
}<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page isELIgnored="false" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Student Enrollment Form</title>
<link href="css/bootstrap.css" rel="stylesheet">
<link href="css/custom.css" rel="stylesheet">
<link href="css/main.css" rel="stylesheet">
</head>
<body>
<div class="form-container">
<h1>Student Enrollment Form</h1>
<form:form method="POST" modelAttribute="student" commandName="student" class="form-horizontal" action="save">
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="firstName">First Name</label>
<div class="col-md-7">
<form:input type="text" path="firstName" id="firstName" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="firstName" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="lastName">Last Name</label>
<div class="col-md-7">
<form:input type="text" path="lastName" id="lastName" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="lastName" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="email">Email</label>
<div class="col-md-7">
<form:input type="text" path="email" id="email" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="email" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="country">Country</label>
<div class="col-md-7">
<form:select path="country" id="country" class="form-control input-sm">
<form:option value="">Select Country</form:option>
<form:options items="${countries}" />
</form:select>
<div class="has-error">
<form:errors path="country" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="sex">Sex</label>
<div class="col-md-7" class="form-control input-sm">
<form:radiobutton path="sex" value="M" />Male
<form:radiobutton path="sex" value="F" />Female
<div class="has-error">
<form:errors path="sex" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="section">Section</label>
<div class="col-md-7" class="form-control input-sm">
<form:radiobuttons path="section" items="${sections}" />
<div class="has-error">
<form:errors path="section" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-actions floatRight">
<input type="submit" value="Register" class="btn btn-primary btn-sm">
</div>
</div>
</form:form>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page isELIgnored="false" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link href="/css/bootstrap.css" rel="stylesheet">
<link href="/css/custom.css" rel="stylesheet">
<link href="/css/main.css" rel="stylesheet">
</head>
<body>
<div class="form-container">
<h1>Edit Student Details</h1>
<form:form method="POST" modelAttribute="student" commandName="student" class="form-horizontal" action="/editsave">
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="id"></label>
<div class="col-md-7">
<form:hidden path="id" class="form-control input-sm"/>
<div class="has-error">
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="firstName">First Name</label>
<div class="col-md-7">
<form:input type="text" path="firstName" id="firstName" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="firstName" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="lastName">Last Name</label>
<div class="col-md-7">
<form:input type="text" path="lastName" id="lastName" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="lastName" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="sex">Sex</label>
<div class="col-md-7" class="form-control input-sm">
<form:radiobutton path="sex" value="M" />Male
<form:radiobutton path="sex" value="F" />Female
<div class="has-error">
<form:errors path="sex" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="email">Email</label>
<div class="col-md-7">
<form:input type="text" path="email" id="email" class="form-control input-sm"/>
<div class="has-error">
<form:errors path="email" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="section">Section</label>
<div class="col-md-7" class="form-control input-sm">
<form:radiobuttons path="section" items="${sections}" />
<div class="has-error">
<form:errors path="section" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-3 control-lable" for="country">Country</label>
<div class="col-md-7">
<form:select path="country" id="country" class="form-control input-sm">
<form:option value="">Select Country</form:option>
<form:options items="${countries}" />
</form:select>
<div class="has-error">
<form:errors path="country" class="help-inline"/>
</div>
</div>
</div>
</div>
<div class="row">
<div class="form-actions floatRight">
<input type="submit" value="Edit" class="btn btn-primary btn-sm">
</div>
</div>
</form:form>
</div>
</body>
</html>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link href="/css/bootstrap.css" rel="stylesheet">
<link href="/css/custom.css" rel="stylesheet">
<link href="/css/main.css" rel="stylesheet">
</head>
<body>
<h1 align="center">Students List</h1>
<table id="t02" cellpadding="2">
<tr>
<th>
<a href="/enroll"><h2>Home Page:Enroll New Student</h2></a>
</th>
<th>
<a align ="right" href="/delete"><h2>Delete All Students</h2></a>
</th>
</tr>
</table>
<table >
</table>
<form:form class="form-horizontal" >
<table id="t01" border="2" width="70%" cellpadding="2">
<tr><th>Id</th><th>First Name</th><th>Last Name</th>
<th>Sex</th><th>Date Modified</th>
<th>Email</th><th>Section</th><th>Country</th>
<th>Edit</th><th>Delete</th></tr>
<c:forEach var="student" items="${list}">
<tr>
<td>${student.id}</td>
<td>${student.firstName}</td>
<td>${student.lastName}</td>
<td>${student.sex}</td>
<td>${student.createdAt}</td>
<td>${student.email}</td>
<td>${student.section}</td>
<td>${student.country}</td>
<td><a href="/editstudent/${student.id}">Edit</a></td>
<td><a href="/deletestudent/${student.id}">Delete</a></td>
</tr>
</c:forEach>
</table>
<br/>
</form:form>
</body>
</html>
这是我的整个项目。当我尝试在Web上部署它时，它显示404找不到，在控制台中它显示
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-03-14 19:16:13.739 ERROR 4368 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'studentController': Unsatisfied dependency expressed through field 'studentDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.dao.StudentDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
答案 0 :(得分：1)
尝试在@Repository接口上添加StudentRepository注释，在@EnableJpaRepositories("com.repository")类上添加StudentApplication，在@ComponentScan("com")类上也添加StudentApplication。
由于StudentRepository类和其他类位于不同的程序包中，因此Spring无法自动连接StudentDAO和StudentApplication。
答案 1 :(得分：0)
SpringBoot将自动扫描软件包中的存储库，这些软件包是@SpringBootApplication带注释的类所在的软件包的子软件包。
因此，在您的情况下，因为它位于com.application中，所以应该将存储库放在该位置之下。也许com.application.repository。否则，您需要弄乱其他注释，以按照其他人的建议在其他软件包中启用组件扫描。