- 实体类
@Cacheable
@Table(name="SSSP_DEPARTMENT")
@Entity
public class Department {
private Integer id;
private String departmentName;
@GeneratedValue
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
@Override
public String toString() {
return "Department [id=" + id + ", departmentName=" + departmentName + "]";
}
}
@Table(name="SSSP_EMPLOYEE")
@Entity
public class Employee {
private Integer id;
private String lastName;
private String email;
@DateTimeFormat(pattern="yyyy-MM-dd")
private Date birth;
private Date createTime;
private Department department;
@GeneratedValue
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Temporal(TemporalType.DATE) //设置表创建时字段时间类型
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
@Temporal(TemporalType.TIMESTAMP)
@JoinColumn(name="DEPARTMENT_ID") //外键
@ManyToOne(fetch=FetchType.LAZY)
public Department getDepartment() {
return department;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public void setDepartment(Department department) {
this.department = department;
}
@Override
public String toString() {
return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", birth=" + birth
+ ", creatTime=" + createTime + ", department=" + department + "]";
}
}
- DAO层
public interface EmployeeRepository extends JpaRepository<Employee, Integer>{
Employee getByLastName(String lastName);
}
public interface DepartmentRepository extends JpaRepository<Department, Integer>{
/**
*定义开启二级缓存的方法
* @return
*/
@QueryHints({@QueryHint(name=org.hibernate.ejb.QueryHints.HINT_CACHEABLE,value="true")})
@Query("FROM Department d")
List<Department>
- service层
@Service
public class EmployeeService {
@Autowired
private EmployeeRepository employeeRepository;
/**
* 删除
* @param id
*/
public void delete(Integer id){
employeeRepository.delete(id);
}
/**
* 查询单独一条数据 此方法有Spring Data 提供
* @param id
* @return
*/
public Employee get(Integer id){
return employeeRepository.findOne(id);
}
/**
* 测试name的可用性
* @param lastName
* @return
*/
@Transactional(readOnly=true)
public Employee getLastName(String lastName){
return employeeRepository.getByLastName(lastName);
}
@Transactional
public void save(Employee employee){
System.out.println("ID的值为:"+employee.getId());
// 设置创建时间 createTime 属性
if(employee.getId() == null){
employee.setCreateTime(new Date());
}
employeeRepository.saveAndFlush(employee);
}
@Transactional(readOnly=true)
public Page<Employee> getPage(int pageNo,int pageSize){
PageRequest pageable = new PageRequest(pageNo - 1, pageSize);
// 该接口无条件查询需要传入一个Pageable类型参数 PageRequest 为该接口的实现类
return employeeRepository.findAll(pageable);
}
}
@Service
public class DepartmentService {
@Autowired
private DepartmentRepository departmentRepository;
@Transactional(readOnly=true)
public List<Department> getAll(){
return departmentRepository.getAll();
}
}
- handler层
@Controller
public class EmployeeHandler {
@Autowired
private EmployeeService employeeService;
@Autowired
private DepartmentService departmentService;
@RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
public String delete(@PathVariable("id") Integer id){
employeeService.delete(id);
System.out.println("等待跳转:++++++++++++++");
return "index";
}
/**
* 解决在参数回显时 时间为空的问题
* @param id
* @param map
*/
@ModelAttribute
public void getEmployee(@RequestParam(value="id",required=false) Integer id,
Map<String, Object> map){
if(id != null){
Employee employee = employeeService.get(id);
/*
* 在修改时: 若修改了部门的信息 则会产生错误
*
* 在执行update之前 系统会将得到的参数赋值给 map中的employee 此时该对象的生命周期还未结束 所以操作的为同一个对象
*
* 解决方法:在赋值之前将map中的employee制空 则在此时赋值不会发生错误
*
*/
employee.setDepartment(null);
map.put("employee", employee);
}
}
/**
* 更新
*
* @param employee
* @return
*/
@RequestMapping(value = "/emp/{id}", method = RequestMethod.PUT)
public String update(Employee employee) {
employeeService.save(employee);
return "redirect:/emps";
}
/**
* 点击更新后 回显
*
* @param id
* @param map
* @return
*/
@RequestMapping(value = "/emp/{id}", method = RequestMethod.GET)
public String input(@PathVariable("id") Integer id, Map<String, Object> map) {
System.out.println("我被调用了-----------------------------");
Employee employee = employeeService.get(id);
// 此处的employee 要与跳转的界面中 modelAttribute 的值相同 此处采用springMVC 自带标签
map.put("employee", employee);
System.out.println("employee的ID:"+employee.getId());
map.put("departments", departmentService.getAll());
return "/emp/input";
}
/**
* 添加
*
* @param employee
* @return
*/
@RequestMapping(value = "/emp", method = RequestMethod.POST)
public String save(Employee employee) {
employeeService.save(employee);
return "redirect:/emps";
}
/**
* 跳转到添加页面
*
* @param map
* @return
*/
@RequestMapping(value = "/emp", method = RequestMethod.GET)
public String input(Map<String, Object> map) {
// 显示界面的下拉菜单
map.put("departments", departmentService.getAll());
map.put("employee", new Employee());
return "emp/input";
}
/**
* 第一次请求时该值为空 设置为String 类型:避免传入的参数为String而导致程序死掉
*
* @param pageNoStr
* @return
*/
@RequestMapping(value = "emps", method = RequestMethod.GET)
public String list(@RequestParam(value = "pageNo", required = false, defaultValue = "1") String pageNoStr,
Map<String, Object> map) {
int pageNo = 1;
try {
// 如果出错就用1
if (pageNo < 1) {
pageNo = 1;
}
pageNo = Integer.parseInt(pageNoStr);
} catch (Exception e) {
}
Page<Employee> page = employeeService.getPage(pageNo, 5);
map.put("page", page);
return "emp/list";
}
}
TEST 测试
public class SSSPTest {
private ApplicationContext ctx= null;
private DepartmentRepository dapartmentRepository;
private EntityManagerFactory entityManagerFactory;
{
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
dapartmentRepository = ctx.getBean(DepartmentRepository.class);
entityManagerFactory = ctx.getBean(EntityManagerFactory.class);
}
/**
* jpa 中使用二级缓存的方法
*/
@Test
public void testJpaCashe(){
String jpql="FROM Department d";
EntityManager entityManager = entityManagerFactory.createEntityManager();
Query query = entityManager.createQuery(jpql);
List<Department> department = query.setHint(QueryHints.HINT_CACHEABLE, true).getResultList();
entityManager.close();
entityManager = entityManagerFactory.createEntityManager();
query = entityManager.createQuery(jpql);
department = query.setHint(QueryHints.HINT_CACHEABLE, true).getResultList();
entityManager.close();
}
@Test
public void testDemo(){
List<Department> departments = dapartmentRepository.getAll();
departments = dapartmentRepository.getAll();
}
@Test
public void testDataSourse() throws SQLException{
DataSource data = ctx.getBean(DataSource.class);
System.out.println(data.getConnection());
}
}
- 视图展示
list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
//获取绝对路径路径
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!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>首页</title>
<script type="text/javascript" src="${pageContext.request.contextPath }/scripts/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$(function(){
$(".delete").click(function(){
var label = $(this).next(":hidden").val(); //label 等于我后面的hidden的值
var flag = confirm("确定删除"+label+"的信息吗?");
if(flag){
var url = $(this).attr("href"); //获取当前点击路径
$("#_form").attr("action",url);
$("#_method").val("DELETE");
$("#_form").submit();
}
/*
没写这句导致 在执行完删除后 页面跳转到回显界面
*/
return false;
});
})
</script>
</head>
<base href="<%=basePath%>" />
<body>
<!--删除时所用的表单 -->
<form action="" method="post" id="_form">
<input id="_method" name="_method" type="hidden">
</form>
<!--
如果当前页记录数为空 则显示无记录数
-->
<c:if test="${page == null || page.numberOfElements == 0 }">
没有任何记录
</c:if>
<c:if test="${page != null || page.numberOfElements > 0 }">
<table border="1" cellpadding="10" cellspacing="0">
<tr>
<th>ID</th>
<th>lastName</th>
<th>Email</th>
<th>Birth</th>
<th>CreateTime</th>
<th>部门</th>
<th>Edit</th>
<th>Delete</th>
</tr>
<c:forEach items="${page.content}" var="emp">
<tr>
<td>${emp.id }</td>
<td>${emp.lastName }</td>
<td>${emp.email }</td>
<td>
<fmt:formatDate value="${emp.birth }" pattern="yyyy-MM-dd" />
</td>
<td>
<fmt:formatDate value="${emp.createTime }" pattern="yyyy-MM-dd hh:mm:ss"/>
</td>
<!--
JPA 默认在获取关联属性时 会一并查出来, 此时将发送N条查询语句 (不可取)
此时需要添加懒加载方法是来获取,但如果在关联关系上 添加懒加载 则会报懒加载异常。
原因:事务的边缘在service方法结束的时候 当servcie方法执行完毕 事务接受 则session关闭,则他关
联的对象就是一个代理对象,而页面上需要使用该代理对象的属性 则发生异常
解决方法:
在web.xml下配置 OpenEntityManagerInViewFilter 可以解决懒加载异常
-->
<td>${emp.department.departmentName }</td>
<td><a href="${pageContext.request.contextPath }/emp/${emp.id}">Edit</a></td>
<td><a href="${pageContext.request.contextPath }/emp/${emp.id}" class="delete">Delete</a>
<input type="hidden" value="${emp.lastName }">
</td>
</tr>
</c:forEach>
<tr>
<td colspan="8">共${page.totalElements }条记录
共${page.totalPages } 页
当前${page.number+1 }页
<a href="emps?pageNo=${page.number+1-1 }">上一页</a> <a href="emps?pageNo=${page.number+1+1 }">下一页</a>
</td>
</tr>
</table>
</c:if>
</body>
</html>
input.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath }/scripts/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$(function(){
$("#lastName").change(function(){
var val = $(this).val();
val = $.trim(val);
$(this).val(val);
//若修改的 lastName 和之前的 lastName 一致, 则不发送 Ajax 请求, 直接 alert:lastName 可用!
var _oldLastName = $("#_oldLastName").val();
_oldLastName = $.trim(_oldLastName);
if(_oldLastName != null && _oldLastName != "" && _oldLastName == val){
alert("lastName 可用!");
return;
}
var url = "${pageContext.request.contextPath }/ajaxValidateLastName";
var args = {"lastName":val,"date":new Date()};
$.post(url, args, function(data){
if(data == "0"){
alert("lastName 可用!");
}else if(data == "1"){
alert("lastName 不可用!");
}else{
alert("网络或程序出错. ");
}
});
});
})
</script>
</head>
<body>
<c:set value="${pageContext.request.contextPath }/emp" var="url"></c:set>
<c:if test="${employee.id != null }">
<c:set value="${pageContext.request.contextPath }/emp/${employee.id}" var="url"></c:set>
</c:if>
<form:form action="${url }" method="POST" modelAttribute="employee">
<c:if test="${employee.id != null }">
<input type="hidden" id="_oldLastName" value="${employee.lastName }"/>
<form:hidden path="id"/>
<input type="hidden" name="_method" value="PUT"/>
</c:if>
LastName: <form:input path="lastName" id="lastName"/>
<br>
Email: <form:input path="email"/>
<br>
Birth: <form:input path="birth"/>
<br>
Department:
<form:select path="department.id" items="${departments }"
itemLabel="departmentName" itemValue="id"></form:select>
<br>
<input type="submit" value="Submit"/>
</form:form>
</body>
</html>
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
//获取绝对路径路径
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!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>首页</title>
</head>
<base href="<%=basePath %>"/>
<body>
<a href="emps">List ALL</a>
<a href="emp">Add New Employee</a>
</body>
</html>