SSSP — 實列展示

• 實體類

@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) //設置表創建時字段時間類型
    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }
   @Temporal(TemporalType.TIMESTAMP)

    @JoinColumn(name="DEPARTMENT_ID")  //外鍵
    @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層

public interface EmployeeRepository extends JpaRepository<Employee, Integer>{
     Employee getByLastName(String lastName);
}

public interface DepartmentRepository extends JpaRepository<Department, Integer>{
    /**
     *定義開啓二級緩存的方法
     * @return
     */
    @QueryHints({@QueryHint(name=org.hibernate.ejb.QueryHints.HINT_CACHEABLE,value="true")})
    @Query("FROM Department d")
    List<Department> 

• service層

@Service
public class EmployeeService {

    @Autowired
     private EmployeeRepository employeeRepository;
    /**
     * 刪除
     * @param id
     */
    public void delete(Integer id){
        employeeRepository.delete(id);
    }

    /**
     * 查詢單獨一條數據 此方法有Spring Data 提供
     * @param id
     * @return
     */
    public Employee get(Integer id){
        return employeeRepository.findOne(id);
    }
    /**
     * 測試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的值爲："+employee.getId());
        // 設置創建時間 createTime 屬性
        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);
        // 該接口無條件查詢需要傳入一個Pageable類型參數  PageRequest 爲該接口的實現類
        return employeeRepository.findAll(pageable);

    }
} 

@Service
public class DepartmentService {
    @Autowired
    private DepartmentRepository departmentRepository;

    @Transactional(readOnly=true)
    public  List<Department> getAll(){
        return departmentRepository.getAll();
    }
}

• handler層

@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("等待跳轉：++++++++++++++");
        return "index";

    }
    /**
     * 解決在參數回顯時 時間爲空的問題
     * @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);
                /*
             * 在修改時: 若修改了部門的信息 則會產生錯誤 
             * 
             * 在執行update之前 系統會將得到的參數賦值給 map中的employee 此時該對象的生命週期還未結束 所以操作的爲同一個對象
             * 
             * 解決方法：在賦值之前將map中的employee制空 則在此時賦值不會發生錯誤
             * 
             */
            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";
    }

    /**
     * 點擊更新後 回顯
     * 
     * @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("我被調用了-----------------------------");
        Employee employee = employeeService.get(id);
        // 此處的employee 要與跳轉的界面中 modelAttribute 的值相同 此處採用springMVC 自帶標籤
        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";
    }

    /**
     * 跳轉到添加頁面
     * 
     * @param map
     * @return
     */
    @RequestMapping(value = "/emp", method = RequestMethod.GET)
    public String input(Map<String, Object> map) {
        // 顯示界面的下拉菜單
        map.put("departments", departmentService.getAll());
        map.put("employee", new Employee());
        return "emp/input";
    }

    /**
     * 第一次請求時該值爲空 設置爲String 類型：避免傳入的參數爲String而導致程序死掉
     * 
     * @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 {

            // 如果出錯就用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 測試

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 中使用二級緩存的方法
      */
     @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());
     }
}

• 視圖展示
  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"%>
<%
    //獲取絕對路徑路徑 
    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>首頁</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 等於我後面的hidden的值
          var flag = confirm("確定刪除"+label+"的信息嗎？");
         if(flag){
             var url = $(this).attr("href"); //獲取當前點擊路徑
             $("#_form").attr("action",url);
             $("#_method").val("DELETE");
             $("#_form").submit();
         }
         /*  
           沒寫這句導致 在執行完刪除後 頁面跳轉到回顯界面
         */
         return false; 
      });

  })


</script>
</head>
<base href="<%=basePath%>" />
<body>

    <!--刪除時所用的表單  -->
  <form action="" method="post" id="_form">
     <input id="_method" name="_method" type="hidden">
  </form>

    <!--
            如果當前頁記錄數爲空 則顯示無記錄數
      -->
    <c:if test="${page == null || page.numberOfElements == 0 }">
         沒有任何記錄
   </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>部門</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 默認在獲取關聯屬性時  會一併查出來, 此時將發送N條查詢語句 (不可取)
                       此時需要添加懶加載方法是來獲取，但如果在關聯關係上 添加懶加載 則會報懶加載異常。
                       原因：事務的邊緣在service方法結束的時候 當servcie方法執行完畢 事務接受 則session關閉,則他關
                       聯的對象就是一個代理對象,而頁面上需要使用該代理對象的屬性 則發生異常
                       解決方法：

                       在web.xml下配置 OpenEntityManagerInViewFilter 可以解決懶加載異常

                    -->
                    <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${page.totalElements }條記錄 
                     共${page.totalPages  } 頁 
                    當前${page.number+1 }頁 
                    <a href="emps?pageNo=${page.number+1-1 }">上一頁</a> <a href="emps?pageNo=${page.number+1+1 }">下一頁</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, 則不發送 Ajax 請求, 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("網絡或程序出錯. ");
                }
            });
        });
    })
</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"%>

    <%
    //獲取絕對路徑路徑 
    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>首頁</title>
</head>
<base href="<%=basePath %>"/>
<body>

  <a href="emps">List ALL</a>

  <a href="emp">Add New Employee</a>
</body>
</html>