java框架--springmvc+springdata+jpa+restful+ajax 完成 CRUD

時間  2019-11-18
標籤 java 框架 springmvc+springdata+jpa+restful+ajax springmvc springdata jpa restful ajax 完成 crud 欄目 Java 简体版
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com.atguigu.sssp.entityjavascript

package com.atguigu.sssp.entity;

import javax.persistence.Cacheable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Cacheable
@Table(name="SSSP_DEPARTMENTS")
@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;
    }

}
Department 
package com.atguigu.sssp.entity;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.springframework.format.annotation.DateTimeFormat;

@Table(name="SSSP_EMPLOYEES")
@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)
    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    @Temporal(TemporalType.TIMESTAMP)
    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    @JoinColumn(name="DEPARTMENT_ID")
    @ManyToOne(fetch=FetchType.LAZY)
    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }
}
Employee

com.atguigu.sssp.handlehtml

package com.atguigu.sssp.handler;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
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.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.atguigu.sssp.entity.Employee;
import com.atguigu.sssp.service.DepartmentService;
import com.atguigu.sssp.service.EmployeeService;

@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);
        return "redirect:/emps";
    }
    
    @ModelAttribute
    public void getEmployee(@RequestParam(value="id",required=false) Integer id,
            Map<String, Object> map){
        if(id != null){
            Employee employee = employeeService.get(id);
            employee.setDepartment(null);
            map.put("employee", employee);
        }
    }
    
    @RequestMapping(value="/emp/{id}",method=RequestMethod.PUT)
    public String update(Employee employee){
        employeeService.save(employee);
        return "redirect:/emps";
    }
    // 編輯功能以前先查詢功能
    @RequestMapping(value="/emp/{id}", method=RequestMethod.GET)
    public String input(@PathVariable("id") Integer id, Map<String, Object> map){
        Employee employee = employeeService.get(id);
        map.put("employee", employee);
        map.put("departments", departmentService.getAll());
        return "emp/input";
    }
    
    @RequestMapping(value="/emp",method=RequestMethod.POST)
    public String save(Employee employee){
        employeeService.save(employee);
        return "redirect:/emps";
    }
    //ajax判斷修改時候是不是同一用戶名
    @ResponseBody
    @RequestMapping(value="/ajaxValidateLastName",method=RequestMethod.POST)
    public String validateLastName(@RequestParam(value="lastName",required=true) String lastName){
        Employee employee = employeeService.getByLastName(lastName);
        if(employee == null){
            return "0";
        }else{
            return "1";
        }
    }
    //添加功能
    @RequestMapping(value="/emp",method=RequestMethod.GET)
    public String input(Map<String,Object> map){
        map.put("departments", departmentService.getAll());
        map.put("employee", new Employee());
        return "emp/input";
    }
    //查詢全部
    @RequestMapping("/emps")
    public String list(@RequestParam(value="pageNo", required=false, defaultValue="1") String pageNoStr, 
            Map<String, Object> map){
        int pageNo = 1;
        
        try {
            pageNo = Integer.parseInt(pageNoStr);
            if(pageNo < 1){
                pageNo = 1;
            }
        } catch (Exception e) {}
        
        Page<Employee> page = employeeService.getPage(pageNo, 5);
        map.put("page", page);
        
        return "emp/list";
    }
    
}
EmployeeHandler

com.atguigu.sssp.repositoryjava

package com.atguigu.sssp.repository;

import java.util.List;

import javax.persistence.QueryHint;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.jpa.repository.QueryHints;

import com.atguigu.sssp.entity.Department;

public interface DepartmentRepository extends JpaRepository<Department, Integer>{

    @QueryHints({@QueryHint(name=org.hibernate.ejb.QueryHints.HINT_CACHEABLE,value="true")})
    @Query("FROM Department d")
    List<Department> getAll();
    
}
DepartmentRepository 
package com.atguigu.sssp.repository;

import org.springframework.data.jpa.repository.JpaRepository;

import com.atguigu.sssp.entity.Employee;

public interface EmployeeRepository extends JpaRepository<Employee, Integer> {

    Employee getByLastName(String lastName);
    
}
EmployeeRepository

com.atguigu.sssp.servicemysql

package com.atguigu.sssp.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.atguigu.sssp.entity.Department;
import com.atguigu.sssp.repository.DepartmentRepository;

@Service
public class DepartmentService {

    @Autowired
    private DepartmentRepository departmentRepository;
    
    @Transactional(readOnly=true)
    public List<Department> getAll(){
        return departmentRepository.getAll();
    }
}
DepartmentService 
package com.atguigu.sssp.service;

import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.atguigu.sssp.entity.Employee;
import com.atguigu.sssp.repository.EmployeeRepository;

@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository employeeRepository;
    
    @Transactional
    public void delete(Integer id){
        employeeRepository.delete(id);
    }
    
    @Transactional(readOnly=true)
    public Employee get(Integer id){
        return employeeRepository.findOne(id);
    }
    
    @Transactional
    public void save(Employee employee){
        if(employee.getId() == null){
            employee.setCreateTime(new Date());
        }
        employeeRepository.saveAndFlush(employee);
    }
    
    @Transactional(readOnly=true)
    public Employee getByLastName(String lastName){
        return employeeRepository.getByLastName(lastName);
    }
    
    @Transactional(readOnly=true)
    public Page<Employee> getPage(int pageNo, int pageSize){
        PageRequest pageable = new PageRequest(pageNo - 1, pageSize);
        return employeeRepository.findAll(pageable);
    }
}
EmployeeService

src 配置文件jquery

<?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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 配置自動掃描的包 -->
    <context:component-scan base-package="com.atguigu.sssp">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
    </context:component-scan>
    
    <!-- 配置數據源 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <bean id="dataSource"
        class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.user}"></property>    
        <property name="password" value="${jdbc.password}"></property>    
        <property name="driverClass" value="${jdbc.driverClass}"></property>    
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>    
        
        <!-- 配置其餘屬性 -->
    </bean>
    
    <!-- 配置 JPA 的 EntityManagerFactory -->
    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
        </property>    
        <property name="packagesToScan" value="com.atguigu.sssp"></property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
                
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
                <prop key="hibernate.cache.use_query_cache">true</prop>
            </props>
        </property>
        <property name="sharedCacheMode" value="ENABLE_SELECTIVE"></property>
    </bean>
    
    <!-- 配置事務 -->
    <bean id="transactionManager"
        class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"></property>    
    </bean>
    
    <!-- 配置支持基於註解的事務 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
    <!-- 配置 SpringData -->
    <jpa:repositories base-package="com.atguigu.sssp"
        entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>
    
</beans>
applicationContext.xml 
jdbc.user=root
jdbc.password=123456
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///spring
db.properties 
<ehcache>

    <!-- Sets the path to the directory where cache .data files are created.

         If the path is a Java System Property it is replaced by
         its value in the running VM.

         The following properties are translated:
         user.home - User's home directory
         user.dir - User's current working directory
         java.io.tmpdir - Default temp file path -->
    <diskStore path="java.io.tmpdir"/>


    <!--Default Cache configuration. These will applied to caches programmatically created through
        the CacheManager.

        The following attributes are required for defaultCache:

        maxInMemory       - Sets the maximum number of objects that will be created in memory
        eternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the element
                            is never expired.
        timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used
                            if the element is not eternal. Idle time is now - last accessed time
        timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used
                            if the element is not eternal. TTL is now - creation time
        overflowToDisk    - Sets whether elements can overflow to disk when the in-memory cache
                            has reached the maxInMemory limit.

        -->
    <defaultCache
        maxElementsInMemory="10000"
        eternal="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        overflowToDisk="true"
        />

    <!--Predefined caches.  Add your cache configuration settings here.
        If you do not have a configuration for your cache a WARNING will be issued when the
        CacheManager starts

        The following attributes are required for defaultCache:

        name              - Sets the name of the cache. This is used to identify the cache. It must be unique.
        maxInMemory       - Sets the maximum number of objects that will be created in memory
        eternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the element
                            is never expired.
        timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used
                            if the element is not eternal. Idle time is now - last accessed time
        timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used
                            if the element is not eternal. TTL is now - creation time
        overflowToDisk    - Sets whether elements can overflow to disk when the in-memory cache
                            has reached the maxInMemory limit.

        -->

    <!-- Sample cache named sampleCache1
        This cache contains a maximum in memory of 10000 elements, and will expire
        an element if it is idle for more than 5 minutes and lives for more than
        10 minutes.

        If there are more than 10000 elements it will overflow to the
        disk cache, which in this configuration will go to wherever java.io.tmp is
        defined on your system. On a standard Linux system this will be /tmp"
        -->
    <cache name="sampleCache1"
        maxElementsInMemory="10000"
        eternal="false"
        timeToIdleSeconds="300"
        timeToLiveSeconds="600"
        overflowToDisk="true"
        />

    <!-- Sample cache named sampleCache2
        This cache contains 1000 elements. Elements will always be held in memory.
        They are not expired. -->
    <cache name="sampleCache2"
        maxElementsInMemory="1000"
        eternal="true"
        timeToIdleSeconds="0"
        timeToLiveSeconds="0"
        overflowToDisk="false"
        /> -->

    <!-- Place configuration for your caches following -->

</ehcache>
ehcache.xml 
log4j.rootLogger=debug,CONSOLE,file
#log4j.rootLogger=ERROR,ROLLING_FILE

log4j.logger.org.slsale=debug
log4j.logger.org.apache.ibatis=debug
log4j.logger.org.mybatis.spring=debug
log4j.logger.java.sql.Connection=debug
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug
log4j.logger.java.sql.ResultSet=debug

######################################################################################
# Console Appender  \u65e5\u5fd7\u5728\u63a7\u5236\u8f93\u51fa\u914d\u7f6e
######################################################################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=debug
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern= - (%r ms) - [%p] %d %c - %m%n

######################################################################################
# Rolling File  \u6587\u4ef6\u5927\u5c0f\u5230\u8fbe\u6307\u5b9a\u5c3a\u5bf8\u7684\u65f6\u5019\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6
######################################################################################
#log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppender
#log4j.appender.ROLLING_FILE.Threshold=INFO
#log4j.appender.ROLLING_FILE.File=${baojia.root}/logs/log.log
#log4j.appender.ROLLING_FILE.Append=true
#log4j.appender.ROLLING_FILE.MaxFileSize=5000KB
#log4j.appender.ROLLING_FILE.MaxBackupIndex=100
#log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout
#log4j.appender.ROLLING_FILE.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n

######################################################################################
# DailyRolling File  \u6bcf\u5929\u4ea7\u751f\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u683c\u5f0f:log2009-09-11
######################################################################################
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=yyyy-MM-dd
log4j.appender.file.File=${sssp_new.root}/logs/log.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=debug
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern= - (%r ms) - %d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n

#DWR \u65e5\u5fd7
#log4j.logger.org.directwebremoting = ERROR

#\u663e\u793aHibernate\u5360\u4f4d\u7b26\u7ed1\u5b9a\u503c\u53ca\u8fd4\u56de\u503c
#log4j.logger.org.hibernate.type=DEBUG,CONSOLE 

#log4j.logger.org.springframework.transaction=DEBUG
#log4j.logger.org.hibernate=DEBUG
#log4j.logger.org.acegisecurity=DEBUG
#log4j.logger.org.apache.myfaces=TRACE
#log4j.logger.org.quartz=DEBUG

#log4j.logger.com.opensymphony=INFO  
#log4j.logger.org.apache.struts2=DEBUG  
log4j.logger.com.opensymphony.xwork2=debug
log4j.xml 
<?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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 配置自動掃描的包 -->
    <context:component-scan base-package="com.atguigu.sssp" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
    </context:component-scan>
    
    <!-- 配置視圖解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 映射加載靜態文件 -->
    <mvc:default-servlet-handler/>
    <!-- 註解加載驅動 -->
    <mvc:annotation-driven></mvc:annotation-driven>

</beans>
springDispatcherServlet-servlet.xml

WebContent web

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

    <!-- 配置啓動 IOC 容器的 Listener -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!-- 配置字符編碼過濾器 -->
    <!-- 字符編碼過濾器必須配置在全部過濾器的最前面! -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 配置能夠把 POST 請求轉爲 PUT、DELETE 請求的 Filter -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 配置 OpenEntityManagerInViewFilter. 能夠解決懶加載異常的問題 -->
    <filter>
        <filter-name>OpenEntityManagerInViewFilter</filter-name>
        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
    </filter>
    
    <filter-mapping>
        <filter-name>OpenEntityManagerInViewFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 配置 SpringMVC 的 DispatcherServlet -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springDispatcherServlet-servlet.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

       <!-- log4j配置 -->
       <context-param>
               <param-name>log4jConfigLocation</param-name>
             <param-value>classpath:log4j.properties</param-value>
       </context-param>
       <context-param>
          <param-name>webAppRootKey</param-name>
          <param-value>sssp_new.root</param-value>
       </context-param> 
       <!-- spring加載log4j的監聽 -->
        <listener>
           <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
       </listener>
</web-app>
web.xml 
<%@ 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 和以前的 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>
input.jsp 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
    
<!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(){
        $(".delete").click(function(){
            var label = $(this).next(":hidden").val();
            var flag = confirm("肯定要刪除" + label + "的信息嗎?");
            if(flag){
                var url = $(this).attr("href");
                
                $("#_form").attr("action", url);
                $("#_method").val("DELETE");
                $("#_form").submit();
            }
            
            return false;
        });
    })
</script>
</head>
<body>

    <form action="" method="POST" id="_form">
        <input type="hidden" id="_method" name="_method"/>
    </form>
    
    <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>Department</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="${emp.createTime }" pattern="yyyy-MM-dd hh:mm:ss"/>
                    </td>
                    <td>${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 ${page.number + 1 } 頁
                    <a href="?pageNo=${page.number + 1 - 1 }">上一頁</a>
                    <a href="?pageNo=${page.number + 1 + 1 }">下一頁</a>
                </td>
            </tr>
            
        </table>
    </c:if>
    
</body>
</html>
list.jsp 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
</head>
<body>
    <a href="emps">List All Employees</a>
    <br><br>
    <a href="emp">Add New Employee</a>
    
</body>
</html>
index.jsp

 

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