SpringMVC中CRUD实例-白红宇

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SpringMVC中CRUD实例

阅读量：6375 次

发布时间：2019-06-23

本文共 20037 字，大约阅读时间需要 66 分钟。

一：新建项目（下面的几乎属于公共的方法，不需要改动）

1.结构

　　

　　

2.添加lib

3.配置web.xml

1 
      2 
     
       3   
      
       SpringMvcCRUD
       4   
       5     
      
        6         
       
        DispatchServlet
        7         
       
        org.springframework.web.servlet.DispatcherServlet
        8         
       
         9             
        
         contextConfigLocation
        10             
        
         classpath:springmcv.xml
        11         
        12         
       
        1
       13     
      14     
      15     
      
       16         
       
        DispatchServlet
       17         
       
        /
       18     
      19     20     
      21     
      
       22         
       
        HiddenHttpMethodFilter
       23         
       
        org.springframework.web.filter.HiddenHttpMethodFilter
       24     
      25     
      
       26         
       
        HiddenHttpMethodFilter
       27         
       
        /*
       28     
      29

4.配置springmvc.xml

5.实体类Department

1 package com.spring.it.enties; 2  3 public class Department { 4  5     private Integer id; 6     private String departmentName; 7  8     public Department() { 9         10     }11     12     public Department(int i, String string) {13         this.id = i;14         this.departmentName = string;15     }16 17     public Integer getId() {18         return id;19     }20 21     public void setId(Integer id) {22         this.id = id;23     }24 25     public String getDepartmentName() {26         return departmentName;27     }28 29     public void setDepartmentName(String departmentName) {30         this.departmentName = departmentName;31     }32 33     @Override34     public String toString() {35         return "Department [id=" + id + ", departmentName=" + departmentName36                 + "]";37     }38     39 }

6.实体类Employee

1 package com.spring.it.enties; 2  3 import java.util.Date; 4 import org.springframework.format.annotation.DateTimeFormat; 5 import org.springframework.format.annotation.NumberFormat; 6  7 public class Employee { 8  9     private Integer id;10     private String lastName;11     private String email;12     //1 male, 0 female13     private Integer gender;14     private Department department;15     16     public Employee(Integer id, String lastName, String email, Integer gender,17             Department department) {18         super();19         this.id = id;20         this.lastName = lastName;21         this.email = email;22         this.gender = gender;23         this.department = department;24     }25 26     public Employee() {27         28     }29     public Integer getId() {30         return id;31     }32 33     public void setId(Integer id) {34         this.id = id;35     }36 37     public String getLastName() {38         return lastName;39     }40 41     public void setLastName(String lastName) {42         this.lastName = lastName;43     }44 45     public String getEmail() {46         return email;47     }48 49     public void setEmail(String email) {50         this.email = email;51     }52 53     public Integer getGender() {54         return gender;55     }56 57     public void setGender(Integer gender) {58         this.gender = gender;59     }60 61     public Department getDepartment() {62         return department;63     }64 65     public void setDepartment(Department department) {66         this.department = department;67     }68     69     @Override70     public String toString() {71         return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender72                 + ", department=" + department + "]";73     }74 75     76 }

7.Dao---DepartmentDao

1 package com.spring.it.dao; 2  3 import java.util.Collection; 4 import java.util.HashMap; 5 import java.util.Map; 6  7 import org.springframework.stereotype.Repository; 8 import com.spring.it.enties.Department; 9 10 @Repository11 public class DepartmentDao {12 13     private static Map
     
       departments = null;14     15     static{16         departments = new HashMap
      
       ();17         18         departments.put(101, new Department(101, "D-AA"));19         departments.put(102, new Department(102, "D-BB"));20         departments.put(103, new Department(103, "D-CC"));21         departments.put(104, new Department(104, "D-DD"));22         departments.put(105, new Department(105, "D-EE"));23     }24     25     public Collection
       
         getDepartments(){26         return departments.values();27     }28     29     public Department getDepartment(Integer id){30         return departments.get(id);31     }32     33 }

8.EmployeeDao

1 package com.spring.it.dao; 2  3 import com.spring.it.enties.Department; 4 import java.util.Collection; 5 import java.util.HashMap; 6 import java.util.Map; 7  8 import org.springframework.beans.factory.annotation.Autowired; 9 import org.springframework.stereotype.Repository;10 import com.spring.it.enties.Employee;11 @Repository12 public class EmployeeDao {13 14     private static Map
     
       employees = null;15     16     @Autowired17     private DepartmentDao departmentDao;18     19     static{20         employees = new HashMap
      
       ();21 22         employees.put(1001, new Employee(1001, "E-AA", "aa@163.com", 1, new Department(101, "D-AA")));23         employees.put(1002, new Employee(1002, "E-BB", "bb@163.com", 1, new Department(102, "D-BB")));24         employees.put(1003, new Employee(1003, "E-CC", "cc@163.com", 0, new Department(103, "D-CC")));25         employees.put(1004, new Employee(1004, "E-DD", "dd@163.com", 0, new Department(104, "D-DD")));26         employees.put(1005, new Employee(1005, "E-EE", "ee@163.com", 1, new Department(105, "D-EE")));27     }28     29     private static Integer initId = 1006;30     31     public void save(Employee employee){32         if(employee.getId() == null){33             employee.setId(initId++);34         }35         36         employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));37         employees.put(employee.getId(), employee);38     }39     40     public Collection
       
         getAll(){41         return employees.values();42     }43     44     public Employee get(Integer id){45         return employees.get(id);46     }47     48     public void delete(Integer id){49         employees.remove(id);50     }51 }

二：展示所有的员工---查看操作

1.Controller--EmployeeHander

1 package com.spring.it.handlers; 2  3 import java.util.Map; 4  5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.RequestMapping; 8  9 import com.spring.it.dao.EmployeeDao;10 11 @Controller12 public class EmployeeHander {13     @Autowired(required=true)14     private EmployeeDao employeeDao;15     16     @RequestMapping("/emps")17     public String list(Map
     
       map) {18         System.out.println("====");19         map.put("employee", employeeDao.getAll());20         return "list";21     }22 }

2.首页index.jsp

1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" 2     pageEncoding="ISO-8859-1"%> 3  4  5  6 
      7 Insert title here 8  9 10     
11     list emps12 13

3.list.jsp

1 <%@ page language="java" contentType="text/html; charset=utf-8" 2     pageEncoding="utf-8"%> 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 4  5  6  7 
      8 Insert title here 9 10 11     This Is All Employee12     
     
      13         没有任何的员工信息14     
     15     
     
      16         
      
       27                 
      
      
       17             
18                 
19                 
20                 
21                 
22                 
23                 
24                 
25             
26             
         28                     
29                     
30                     
31                     
32                     
33                     
34                     
35                 
36             37         
                                             ID          LastName          Email          Gender          Department          Edit          Delete         
                 ${emp.id}          ${emp.lastName}          ${emp.email}          ${emp.gender==0?'Female':'Male'}          ${emp.department.departmentName}          Edit          Delete         
       
      
38     
     39 40

4.效果

　　

三：添加操作

1.controller

　　主要是增加了input与save操作。

1 package com.spring.it.handlers; 2  3 import java.util.Map; 4  5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.bind.annotation.RequestMethod; 9 10 import com.spring.it.dao.DepartmentDao;11 import com.spring.it.dao.EmployeeDao;12 import com.spring.it.enties.Department;13 import com.spring.it.enties.Employee;14 15 @Controller16 public class EmployeeHander {17     @Autowired(required=true)18     private EmployeeDao employeeDao;19     20     @Autowired(required=true)21     private DepartmentDao departmentDao;22     23     /**24      * 保存，是submit提交过来的请求，属于Post请求25      */26     @RequestMapping(value="/emp",method=RequestMethod.POST)27     public String save(Employee employee) {28         employeeDao.save(employee);29         return "redirect:/emps";30     }31     32     /**33      * 跳转到input页面，用于添加员工,是Get请求34      */35     @RequestMapping(value="/emp",method=RequestMethod.GET)36     public String input(Map
     
       map) {37         map.put("department", departmentDao.getDepartments());38         //因为form表单的原因，默认一定要回显，第一次尽进来需要传入一个值39         map.put("employee", new Employee());40         return "input";41     }42     43     /**44      * 展示所有的员工45      */46     @RequestMapping("/emps")47     public String list(Map
      
        map) {48         System.out.println("====");49         map.put("employee", employeeDao.getAll());50         return "list";51     }52 }

2.input.jsp

1 <%@ page language="java" contentType="text/html; charset=utf-8" 2     pageEncoding="utf-8"%> 3 <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> 4 <%@ page import="java.util.Map"%> 5 <%@ page import="java.util.HashMap"%> 6  7  8  9 
     10 Insert title here11 12 13     
     14     
     15     
     
      16         LastName:
      
      
17         Email:
      
      
18         <%19             Map
      
        genders=new HashMap();20             genders.put("1", "Male");21             genders.put("0", "Female");22             request.setAttribute("genders", genders);23         %>24         Gender:
       
       
25         Department:
       
       
27         
       28     
      
     29 30

3.效果

　　

　　

4.PS---form表单

　　使用的是spring form表单，在input中需要引入标签。

　　

　　

四：删除操作

1.修改list.jsp

　　因为这个时候的list.jsp的delete按钮的连接还是空的，需要补充进去。

　　这个get不能直接转换成delete操作，所以需要借助js。

1 <%@ page language="java" contentType="text/html; charset=utf-8" 2     pageEncoding="utf-8"%> 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 4  5  6  7 
      8 Insert title here 9 10 19 20 21     
     
      22         
      23     
     
24 25     This Is All Employee26     
     
      27         没有任何的员工信息28     
     29     
     
      30         
      
       41                 
      
      
       31             
32                 
33                 
34                 
35                 
36                 
37                 
38                 
39             
40             
         42                     
43                     
44                     
45                     
46                     
47                     
48                     
49                 
50             51         
                                             ID          LastName          Email          Gender          Department          Edit          Delete         
                 ${emp.id}          ${emp.lastName}          ${emp.email}          ${emp.gender==0?'Female':'Male'}          ${emp.department.departmentName}          Edit          Delete         
       
      
52     
     53     
54     Add New Employee55 56

2.controller

1 package com.spring.it.handlers; 2  3 import java.util.Map; 4  5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.PathVariable; 8 import org.springframework.web.bind.annotation.RequestMapping; 9 import org.springframework.web.bind.annotation.RequestMethod;10 import org.springframework.web.bind.annotation.ResponseBody;11 12 import com.spring.it.dao.DepartmentDao;13 import com.spring.it.dao.EmployeeDao;14 import com.spring.it.enties.Department;15 import com.spring.it.enties.Employee;16 17 @Controller18 public class EmployeeHander {19     @Autowired(required=true)20     private EmployeeDao employeeDao;21     22     @Autowired(required=true)23     private DepartmentDao departmentDao;24     25     /**26      * 删除操作27      */28     @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)29     @ResponseBody30     public String delete(@PathVariable("id") Integer id) {31         employeeDao.delete(id);32         return "redirect:/emps";33     }34     35     /**36      * 保存，是submit提交过来的请求，属于Post请求37      */38     @RequestMapping(value="/emp",method=RequestMethod.POST)39     public String save(Employee employee) {40         employeeDao.save(employee);41         return "redirect:/emps";42     }43     44     /**45      * 跳转到input页面，用于添加员工,是Get请求46      */47     @RequestMapping(value="/emp",method=RequestMethod.GET)48     public String input(Map
     
       map) {49         map.put("department", departmentDao.getDepartments());50         //因为form表单的原因，默认一定要回显，第一次尽进来需要传入一个值51         map.put("employee", new Employee());52         return "input";53     }54     55     /**56      * 展示所有的员工57      */58     @RequestMapping("/emps")59     public String list(Map
      
        map) {60         System.out.println("====");61         map.put("employee", employeeDao.getAll());62         return "list";63     }64 }

　

3.处理静态资源

　　因为springmvc拦截所有的请求，所以静态资源也被拦截，但是静态资源没有被映射。

　　但是静态资源是不需要映射的。

　　解决方式是在springmvc的配置文件中配置default-servlet-handler，但是以前的功能又出现了问题，这个时候需要添加上annotation-driven

4.效果

　　

五：修改

1.修改list

　　Edit的连接需要修改。

1 <%@ page language="java" contentType="text/html; charset=utf-8" 2     pageEncoding="utf-8"%> 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 4  5  6  7 
      8 Insert title here 9 10 19 20 21     
     
      22         
      23     
     
24 25     This Is All Employee26     
     
      27         没有任何的员工信息28     
     29     
     
      30         
      
       41                 
      
      
       31             
32                 
33                 
34                 
35                 
36                 
37                 
38                 
39             
40             
         42                     
43                     
44                     
45                     
46                     
47                     
48                     
49                 
50             51         
                                             ID          LastName          Email          Gender          Department          Edit          Delete         
                 ${emp.id}          ${emp.lastName}          ${emp.email}          ${emp.gender==0?'Female':'Male'}          ${emp.department.departmentName}          Edit          Delete         
       
      
52     
     53     
54     Add New Employee55 56

2.java

　　主要有三个部分：

　　弹出到修改的页面函数

　　更新的函数

　　保证lastname不改变的函数。

1 package com.spring.it.handlers; 2  3 import java.util.Map; 4  5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.ModelAttribute; 8 import org.springframework.web.bind.annotation.PathVariable; 9 import org.springframework.web.bind.annotation.RequestMapping;10 import org.springframework.web.bind.annotation.RequestMethod;11 import org.springframework.web.bind.annotation.RequestParam;12 import org.springframework.web.bind.annotation.ResponseBody;13 import org.springframework.web.servlet.view.RedirectView;14 15 import com.spring.it.dao.DepartmentDao;16 import com.spring.it.dao.EmployeeDao;17 import com.spring.it.enties.Department;18 import com.spring.it.enties.Employee;19 20 @Controller21 public class EmployeeHander {22     @Autowired(required=true)23     private EmployeeDao employeeDao;24     25     @Autowired(required=true)26     private DepartmentDao departmentDao;27 28     /**29      * 使得lastName不被修改，使用ModelAttribute30      */31     @ModelAttribute32     public void getEmployee(@RequestParam(value="id",required=false) Integer id,Map
     
       map) {33         if(id!=null) {34             map.put("employee", employeeDao.get(id));35         }36     }37     38     /**39      * 编辑，主要是提交40      */41     @RequestMapping(value="/emp",method=RequestMethod.PUT)42     public String update(Employee employee) {43         employeeDao.save(employee);44         return "redirect:/emps";45     }46         47     /**48      * 编辑，主要是跳转到要编辑的页面49      */50     @RequestMapping(value="/emp/{id}",method=RequestMethod.GET)51     public String input(@PathVariable("id") Integer id,Map
      
        map) {52         map.put("department", departmentDao.getDepartments());53         //回显54         map.put("employee", employeeDao.get(id));55         return "input";56     }57     58     /**59      * 删除操作60      */61     @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)62     @ResponseBody63     public String delete(@PathVariable("id") Integer id) {64         employeeDao.delete(id);65         return "redirect:/emps";66     }67     68     /**69      * 保存，是submit提交过来的请求，属于Post请求70      */71     @RequestMapping(value="/emp",method=RequestMethod.POST)72     public String save(Employee employee) {73         employeeDao.save(employee);74         return "redirect:/emps";75     }76     77     /**78      * 跳转到input页面，用于添加员工,是Get请求79      */80     @RequestMapping(value="/emp",method=RequestMethod.GET)81     public String input(Map
       
         map) {82         map.put("department", departmentDao.getDepartments());83         //因为form表单的原因，默认一定要回显，第一次尽进来需要传入一个值84         map.put("employee", new Employee());85         return "input";86     }87     88     /**89      * 展示所有的员工90      */91     @RequestMapping("/emps")92     public String list(Map
        
          map) {93         System.out.println("====");94         map.put("employee", employeeDao.getAll());95         return "list";96     }97 }

3.input页面

　　根据id是否存在，决定lastname是否显示。

　　id决定是否进行走PUT。

1 <%@ page language="java" contentType="text/html; charset=utf-8" 2     pageEncoding="utf-8"%> 3 <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> 4 <%@ page import="java.util.Map"%> 5 <%@ page import="java.util.HashMap"%> 6 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 7  8  9 10 
     11 Insert title here12 13 14     
     15     
     16     
     
      17         
      18         
      
       19             LastName:
       
       
20         
      21         
      
       22             
       23             
       24             
       25         
      26         27         Email:
      
      
28         <%29             Map
      
        genders=new HashMap();30             genders.put("1", "Male");31             genders.put("0", "Female");32             request.setAttribute("genders", genders);33         %>34         Gender:
       
       
35         Department:
       
       
37         
       38     
      
     39 40

4.效果

　　

　　

二：

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强烈建议你试试无所不能的CHAT-GPT，快点击我

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