Maven + Spring + SpringMVC + Spring JPA <2>
上一篇全是整的配置，这篇整点代码测试一下，创建下图中红框框住的文件，其中HelloWorldController.java和helloWorld.jsp是测试SpringMVC的，其他则是测试SpringJpa的。
HelloWorldController.java
package org.mice.test;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorldController {
@RequestMapping("/helloWorld")
public String helloWorld(Model model) {
model.addAttribute("message", "Hello World!");
return "helloWorld";
}
}
Student.java
package org.mice.test;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "STUDENT")
public class Student {
@Id
@GeneratedValue
private Integer id;
// 账号
private String account;
// 姓名
private String name;
// 性别
private String sex;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
StudentRepository.java
package org.mice.test;
import org.springframework.data.repository.CrudRepository;
public interface StudentRepository extends CrudRepository<Student, Integer>{
}
StudentService.java
package org.mice.test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service("studentService")
public class StudentService {
@Autowired
private StudentRepository studentRepository;//注入UserRepository
@Transactional
public void saveStudent(Student student) {
studentRepository.save(student);
}
@Transactional(readOnly=true)
public Student findStudentById(Integer id) {
return studentRepository.findOne(id);
}
@Transactional
public void updateStudent(Student student) {
studentRepository.save(student);
}
@Transactional
public void deleteStudentById(Integer id) {
studentRepository.delete(id);
}
}
Test.java
package org.mice.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
StudentService studentService = (StudentService)Test.getBean("studentService");
Student student = new Student();
student.setName("chenph");
student.setAccount("yueritian");
student.setSex("1");
studentService.saveStudent(student);
}
// 加载配置文件
private static ApplicationContext _ctx = new ClassPathXmlApplicationContext(
"config/applicationContext.xml");
/**
* 获取bean对象
*
* @param name
* bean名称
* @return
*/
public static final Object getBean(String name) {
return getContext().getBean(name);
}
public static ApplicationContext getContext() {
return _ctx;
}
}
helloWorld.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'helloWorld.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page. ${message} <br>
</body>
</html>
测试mvc：http://localhost:port/projectname/helloWorld.do
测试jpa：直接Run Test，查看数据库记录，运行这个的过程中会报“java.lang.NoSuchMethodError: javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Lja”，网上资料说的很清楚是javaee包与hibernate-jpa的包冲突了，jpa这个jar里是包括上边提到的这个方法的，所以，对缺少这个方法的jar包做删除处理就可以了。
明后天有空就开始来看看mvc和jpa是如何用到实际需求中，比如json啦，多对多，一对多关系啦。