SpringMVC学习笔记（2）

Springmvc.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/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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <!-- 配置自动扫描的包 --> <context:component-scan base-package="com.atguigu.springmvc"></context:component-scan> <!-- 配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- default-servlet-handler 将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler, 它会对进入 DispatcherServlet 的请求进行筛查, 如果发现是没有经过映射的请求, 就将该请求交由 WEB 应用服务器默认的 Servlet 处理. 如果不是静态资源的请求，才由 DispatcherServlet 继续处理 一般 WEB 应用服务器默认的 Servlet 的名称都是 default. 若所使用的 WEB 服务器的默认 Servlet 名称不是 default，则需要通过 default-servlet-name 属性显式指定 --> <mvc:default-servlet-handler/> <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven> <!-- 配置 ConversionService --> <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> <property name="converters"> <set> <ref bean="employeeConverter"/> </set> </property> </bean> <!-- 配置国际化资源文件 --> <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename" value="i18n"></property> </bean> <!-- 配置 SessionLocalResolver --> <bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"></bean> <mvc:interceptors> <!-- 配置自定义的拦截器 --> <bean class="com.atguigu.springmvc.interceptors.FirstInterceptor"></bean> <!-- 配置拦截器(不)作用的路径 --> <mvc:interceptor> <mvc:mapping path="/emps"/> <bean class="com.atguigu.springmvc.interceptors.SecondInterceptor"></bean> </mvc:interceptor> <!-- 配置 LocaleChanceInterceptor --> <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"></bean> </mvc:interceptors> <!-- <mvc:view-controller path="/i18n" view-name="i18n"/> --> <mvc:view-controller path="/i18n2" view-name="i18n2"/> <!-- 配置 MultipartResolver --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"></property> <property name="maxUploadSize" value="1024000"></property> </bean> <!-- 配置使用 SimpleMappingExceptionResolver 来映射异常 --> <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionAttribute" value="ex"></property> <property name="exceptionMappings"> <props> <prop key="java.lang.ArrayIndexOutOfBoundsException">error</prop> </props> </property> </bean> </beans>

EmployeeConverter.java(自定义转换器）

package com.atguigu.springmvc.converters; import org.springframework.core.convert.converter.Converter; import org.springframework.stereotype.Component; import com.atguigu.springmvc.crud.entities.Department; import com.atguigu.springmvc.crud.entities.Employee; @Component public class EmployeeConverter implements Converter<String, Employee> { @Override public Employee convert(String source) { if(source != null){ String [] vals = source.split("-"); //GG-gg@atguigu.com-0-105 if(vals != null && vals.length == 4){ String lastName = vals[0]; String email = vals[1]; Integer gender = Integer.parseInt(vals[2]); Department department = new Department(); department.setId(Integer.parseInt(vals[3])); Employee employee = new Employee(null, lastName, email, gender, department); System.out.println(source + "--convert--" + employee); return employee; } } return null; } }

SpringMVC拦截器

package com.atguigu.springmvc.interceptors; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class FirstInterceptor implements HandlerInterceptor{ /** * 该方法在目标方法之前被调用. * 若返回值为 true, 则继续调用后续的拦截器和目标方法. * 若返回值为 false, 则不会再调用后续的拦截器和目标方法. * * 可以考虑做权限. 日志, 事务等. */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("[FirstInterceptor] preHandle"); return true; } /** * 调用目标方法之后, 但渲染视图之前. * 可以对请求域中的属性或视图做出修改. */ @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("[FirstInterceptor] postHandle"); } /** * 渲染视图之后被调用. 释放资源 */ @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("[FirstInterceptor] afterCompletion"); } }

JSR303（数据校验）

package com.atguigu.springmvc.crud.entities; import java.util.Date; import javax.validation.constraints.Past; import org.hibernate.validator.constraints.Email; import org.hibernate.validator.constraints.NotEmpty; import org.springframework.format.annotation.DateTimeFormat; import org.springframework.format.annotation.NumberFormat; public class Employee { private Integer id; @NotEmpty private String lastName; @Email private String email; //1 male, 0 female private Integer gender; private Department department; @Past @DateTimeFormat(pattern="yyyy-MM-dd") private Date birth; @NumberFormat(pattern="#,###,###.#") private Float salary; 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; } public Integer getGender() { return gender; } public void setGender(Integer gender) { this.gender = gender; } public Department getDepartment() { return department; } public void setDepartment(Department department) { this.department = department; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } public Float getSalary() { return salary; } public void setSalary(Float salary) { this.salary = salary; } @Override public String toString() { return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", department=" + department + ", birth=" + birth + ", salary=" + salary + "]"; } public Employee(Integer id, String lastName, String email, Integer gender, Department department) { super(); this.id = id; this.lastName = lastName; this.email = email; this.gender = gender; this.department = department; } public Employee() { // TODO Auto-generated constructor stub } }

input.jsp

<%@page import="java.util.HashMap"%> <%@page import="java.util.Map"%> <%@ 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> </head> <body> <form action="testConversionServiceConverer" method="POST"> <!-- lastname-email-gender-department.id 例如: GG-gg@atguigu.com-0-105 --> Employee: <input type="text" name="employee"/> <input type="submit" value="Submit"/> </form> <br><br> <!-- 1. WHY 使用 form 标签呢 ? 可以更快速的开发出表单页面, 而且可以更方便的进行表单值的回显 2. 注意: 可以通过 modelAttribute 属性指定绑定的模型属性, 若没有指定该属性，则默认从 request 域对象中读取 command 的表单 bean 如果该属性值也不存在，则会发生错误。 --> <br><br> <form:form action="${pageContext.request.contextPath }/emp" method="POST" modelAttribute="employee"> <form:errors path="*"></form:errors> <br> <c:if test="${employee.id == null }"> <!-- path 属性对应 html 表单标签的 name 属性值 --> LastName: <form:input path="lastName"/> <form:errors path="lastName"></form:errors> </c:if> <c:if test="${employee.id != null }"> <form:hidden path="id"/> <input type="hidden" name="_method" value="PUT"/> <%-- 对于 _method 不能使用 form:hidden 标签, 因为 modelAttribute 对应的 bean 中没有 _method 这个属性 --%> <%-- <form:hidden path="_method" value="PUT"/> --%> </c:if> <br> Email: <form:input path="email"/> <form:errors path="email"></form:errors> <br> <% Map<String, String> genders = new HashMap(); genders.put("1", "Male"); genders.put("0", "Female"); request.setAttribute("genders", genders); %> Gender: <br> <form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/> <br> Department: <form:select path="department.id" items="${departments }" itemLabel="departmentName" itemValue="id"></form:select> <br> <!-- 1. 数据类型转换 2. 数据类型格式化 3. 数据校验. 1). 如何校验 ? 注解 ? ①. 使用 JSR 303 验证标准 ②. 加入 hibernate validator 验证框架的 jar 包 ③. 在 SpringMVC 配置文件中添加 <mvc:annotation-driven /> ④. 需要在 bean 的属性上添加对应的注解 ⑤. 在目标方法 bean 类型的前面添加 @Valid 注解 2). 验证出错转向到哪一个页面 ? 注意: 需校验的 Bean 对象和其绑定结果对象或错误对象时成对出现的，它们之间不允许声明其他的入参 3). 错误消息 ? 如何显示, 如何把错误消息进行国际化 --> Birth: <form:input path="birth"/> <form:errors path="birth"></form:errors> <br> Salary: <form:input path="salary"/> <br> <input type="submit" value="Submit"/> </form:form> </body> </html>

数据错误显示

package com.atguigu.springmvc.test; import org.springframework.http.HttpStatus; import org.springframework.web.bind.annotation.ResponseStatus; @ResponseStatus(value=HttpStatus.FORBIDDEN, reason="用户名和密码不匹配!") public class UserNameNotMatchPasswordException extends RuntimeException{ /** * */ private static final long serialVersionUID = 1L; }

文件上传

<form action="testFileUpload" method="POST" enctype="multipart/form-data"> File: <input type="file" name="file"/> Desc: <input type="text" name="desc"/> <input type="submit" value="Submit"/> </form> @RequestMapping("/testFileUpload") public String testFileUpload(@RequestParam("desc") String desc, @RequestParam("file") MultipartFile file) throws IOException{ System.out.println("desc: " + desc); System.out.println("OriginalFilename: " + file.getOriginalFilename()); System.out.println("InputStream: " + file.getInputStream()); return "success"; }