SpringMVC-RestfulCRUD

冷不防 2022-10-05 04:45 86阅读 0赞

### 文章目录 ###

*   *  回顾helloword基本配置
     *  员工列表展示
     *  添加
     *  修改
     *  删除

## 回顾helloword基本配置 ##

web.xml

<servlet>
    		<servlet-name>SpringMVC_crud</servlet-name>
    		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    		
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    
    	
    	<servlet-mapping>
    		<servlet-name>SpringMVC_crud</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
      
      	
      	<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>
     		 		
      		<init-param>
      			<param-name>forceEncoding</param-name>
      			<param-value>true</param-value>
      		</init-param>
      	</filter>
      	<filter-mapping>
      		<filter-name>CharacterEncodingFilter</filter-name>
      		<url-pattern>/*</url-pattern>
      	</filter-mapping>
      	
      	
      	<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>

xxxx-sevlet.xml

<context:component-scan base-package="com.jh"></context:component-scan>
    
        
    	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">	
    		<property name="prefix" value="/WEB-INF/pages/"></property>
    		<property name="suffix" value=".jsp"></property>		
    	</bean>

@Controller
    public class helloController {
        
    	
    
    	@RequestMapping("/hello")
    	public String hello(){
        
    		return "success";
    	}
    }

## 员工列表展示 ##

访问index.jsp---->直接发送/emps---->控制器查询所有员工---->放在请求域中---->转发到list页面展示

@Controller
    public class EmployeeController {
        
    
    	@Autowired
    	EmployeeDao employeeDao;
    	
    	/*
    	 * 查询所有员工
    	 */
    	@RequestMapping("/emps")
    	public String getEmps(Model model){
        
    		Collection<Employee> all = employeeDao.getAll();
    		model.addAttribute("emps", all);
    		return "list";
    	}

index.jsp

<jsp:forward page="/emps"></jsp:forward>

list.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    
    
    <title>员工列表</title>
    </head>
    <body>
    <h1>员工列表页面</h1>
    <table border="1" cellpadding="5px" cellspacing="0">
    	<tr>
    		<td>ID</td>
    		<th>lastName</th>
    		<th>email</th>
    		<th>gender</th>
    		<th>departmentName</th>
    		<th>edit</th>
    		<th>delete</th>
    	</tr>
    	<c:forEach items="${emps }" var="emp">
    		<tr>
    			<td>${
        emp.id }</td>
    			<td>${
        emp.lastName }</td>
    			<td>${
        emp.email }</td>
    			<td>${
        emp.gender==0?"女":"男" }</td>
    			<td>${
        emp.department.departmentName }</td>
    			<td>edit</td>
    			<td>delete</td>
    		</tr>
    	</c:forEach>
    </table>
    </body>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70]

## 添加 ##

1、list.jsp点击“员工添加”---->2、查询出所有的部门信息要展示在页面\---->3、来到add.jsp---->4、输入员工数据---->5、点击保存---->6、处理器收到员工保存请求（保存员工）---->7、保存完成后来到list.jsp

/*
    	 * 去员工添加页面，去之前查出所有部门信息进行展示
    	 */
    	@RequestMapping("/toaddpage")
    	public String toAddPage(Model model){
        
    		//1.查出所有部门
    		Collection<Department> departments = departmentDao.getDepartments();
    		//2.放在请求域中
    		model.addAttribute("depts", departments);
    		model.addAttribute("employee", new Employee());
    		//3.去添加页面
    		return "add";
    	}

list.jsp

add.jsp

<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
    
    <h1>员工添加</h1>
    
    
     <form:form action="" modelAttribute="employee">
     	lastName:<form:input path="lastName"/><br>
     	email:<form:input path="email"/><br>
     	gender:<br>
     		男：<form:radiobutton path="gender" value="1"/><br>
     		女：<form:radiobutton path="gender" value="0"/><br>
     	dept:
     	
     		<form:select path="department.id" items="${depts }" itemLabel="departmentName" itemValue="id"></form:select><br>
     		<input type="submit" value="保存">
     </form:form>

联系  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70 1]  
5、点击保存

/*
    	 * 保存员工
    	 */
    @RequestMapping(value="/emp",method=RequestMethod.POST)
    	public String addEmp(Employee employee){
        
    		System.out.println("要添加的员工；"+employee);
    		employeeDao.save(employee);
    		return "redirect:/emps";
    	}

add.jsp

<%
     	pageContext.setAttribute("ctp", request.getContextPath());
     %>
     <form:form action="${ctp }/emp" modelAttribute="employee" method="POST">

联系：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70 2]  
运行结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70 3]

## 修改 ##

/*
    	 * 修改
    	 */
    	@RequestMapping(value="/emp/{id}",method=RequestMethod.PUT)
    	public String updateEmp(@ModelAttribute("employee")Employee employee){
        
    		System.out.println("要修改的员工"+employee);
    		//更新保存二合一
    		employeeDao.save(employee);
    		return "redirect:/emps";
    	}
    	
    	/*
    	 * 提前查询员工
    	 */
    	@ModelAttribute
    	public void myModelAttribute(@RequestParam(value="id",required=false)Integer id,Model model){
        
    		if(id!=null){
        
    			Employee employee = employeeDao.get(id);
    			model.addAttribute("employee", employee);
    		}
    	}

list.jsp  
为edit加链接

<%
     	pageContext.setAttribute("ctp", request.getContextPath());
     %>
     
    <td>
    				<a href="${ctp }/emp/${emp.id }">edit</a>
    			</td>
    			<td>delete</td>
    		</tr>
    	</c:forEach>
    </table>
    <a href="${ctp }/toaddpage">添加员工</a>

edit.jsp

<%
     	pageContext.setAttribute("ctp", request.getContextPath());
     %>
    <h1>员工修改页面</h1>
    <form:form action="${ctp }/emp/${employee.id }" modelAttribute="employee" method="post">
    	<input type="hidden" name="_method" value="put">
    	<input type="hidden" name="id" value="${employee.id }">
    	email:<form:input path="email"/>
    	gender:   
    		男：<form:radiobutton path="gender" value="1"/>   
    		女：<form:radiobutton path="gender" value="0"/><br>
    	dept:
    		<form:select path="department.id" items="${depts }"
    		itemLabel="departmentName" itemValue="id"></form:select>
    		<br>
    	<input type="submit" value="修改">
    </form:form>

## 删除 ##

/*
    	 * 删除
    	 */
    @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
    public String deleteEmp(@PathVariable("id")Integer id){
        
    	employeeDao.delete(id);
    	return "redirect:/emps"; 
    }

list.jsp

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70 1]: /images/20221005/cfa77bbaee1e4f56bbc9699ca15e8aa4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70 2]: /images/20221005/8bca3beca8494b73890eb32a71fe6cf5.png
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SpringMVC-RestfulCRUD

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