<!--    解决问题：

 1.数据类型转换

 2.数据格式

 3.数据校验

 -->

BirthDay :<form:input path="birthDay"/>

Employee类中增加日期类型属性：

//关于类型转换

private Date birthDay ;

ConversionService converters = 

java.lang.Boolean->java.lang.String: o[email protected]f874ca

java.lang.Character -> java.lang.Number : [email protected]

java.lang.Character -> java.lang.String : [email protected]

java.lang.Enum -> java.lang.String : [email protected]

java.lang.Number -> java.lang.Character : [email protected]

java.lang.Number -> java.lang.Number : [email protected]

java.lang.Number -> java.lang.String : [email protected]

java.lang.String -> java.lang.Boolean : [email protected]

java.lang.String -> java.lang.Character : [email protected]

java.lang.String -> java.lang.Enum : [email protected]

java.lang.String -> java.lang.Number : StringToNumberConverterFactory@18d2c12

java.lang.String -> java.util.Locale : [email protected]

java.lang.String -> java.util.Properties : [email protected]

java.lang.String -> java.util.UUID : [email protected]

java.util.Locale -> java.lang.String : [email protected]

java.util.Properties -> java.lang.String : [email protected]

java.util.UUID -> java.lang.String : [email protected]  ……

package org.springframework.core.convert.support;

import org.springframework.core.convert.converter.Converter;

import org.springframework.core.convert.converter.ConverterFactory;

import org.springframework.util.NumberUtils;

final class StringToNumberConverterFactory implements ConverterFactory<String, Number> {

@Override

public <T extends Number> Converter<String, T> getConverter(Class<T> targetType) {

return new StringToNumber<T>(targetType);

}

private static final class StringToNumber<T extends Number> implements Converter<String, T> {

private final Class<T> targetType;

public StringToNumber(Class<T> targetType) {

this.targetType = targetType;

}

@Override

public T convert(String source) {

if (source.length() == 0) {

return null;

}

return NumberUtils.parseNumber(source, this.targetType);

}

}

}

<form action="empAdd" method="POST">

         <!-- 解决问题：

                 1.数据类型转换

                 2.数据格式

                 3.数据校验                 

                 自定义类型转换器：

                         将字符串转换为Employee对象,完成添加功能         

BirthDay :<input type="text" name="birthDay"/><br><br>        

-->

<!-- 字符串格式：lastName-email-gender-department.id

    例如：[email protected]        

 -->

Employee : <input type="text" name="employee"/>                                

                  <input type="submit" value="Submit"><br><br>

</form>

package com.atguigu.springmvc.crud.handlers;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import com.atguigu.springmvc.crud.dao.EmployeeDao;

import com.atguigu.springmvc.crud.entities.Employee;

@Controller

public class TypeConversionHandler {

@Autowired

private EmployeeDao employeeDao ;

// String -> Employee 需要类型转换器帮忙

@RequestMapping("/empAdd")

public String empAdd(@RequestParam(value="employee") Employee employee){

System.out.println("TypeConversionHandler - " + employee);

employeeDao.save(employee);

return "redirect:/empList";

}

}

package com.atguigu.springmvc.converter;

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;

/**

 * 将字符串转换为Employee对象类型

 */

@Component

public class StringToEmployeeConverter implements Converter<String, Employee> {

@Override

public Employee convert(String source) {

if(source!=null){

String[] strs = source.split("-");

if(strs!=null && strs.length == 4){

String lastName = strs[0];

String email = strs[1];

Integer gender = Integer.parseInt(strs[2]);

Integer deptId = Integer.parseInt(strs[3]);

Department dept = new Department();

dept.setId(deptId);

Employee employee = new Employee(null,lastName,email,gender,dept);

System.out.println(source+"--converter--"+employee);

return employee ;

}

}

return null;

}

}

<bean id="conversionService"  

class="org.springframework.context.support.ConversionServiceFactoryBean">

<property name="converters">

<set>

<!-- 引用类型转换器 -->

<ref bean="stringToEmployeeConverter"/>

</set>                        

</property>

</bean>

<mvc:view-controller path="/success" view-name="success"/>

<mvc: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。

四月 30, 2016 3:52:21 下午 org.springframework.web.servlet.PageNotFound noHandlerFound

警告: No mapping found for HTTP request with URI [/SpringMVC_03_RESTFul_CRUD/scripts/jquery-1.9.1.min.js] in DispatcherServlet with name 'springDispatcherServlet'

/**

由 @InitBinder 标识的方法，可以对 WebDataBinder 对象进行初始化。

WebDataBinder 是 DataBinder 的子类，用于完成由表单字段到 JavaBean 属性的绑定

@InitBinder方法不能有返回值，它必须声明为void。

@InitBinder方法的参数通常是 WebDataBinder

 */

@InitBinder

public void initBinder(WebDataBinder dataBinder){

dataBinder.setDisallowedFields("lastName");

}

<!-- 声明类型转换器服务 -->

<!-- <bean id="conversionService"

 class="org.springframework.context.support.ConversionServiceFactoryBean"> -->

<bean id="conversionService"

 class="org.springframework.format.support.FormattingConversionServiceFactoryBean">

<property name="converters">

<set>

<!-- 引用类型转换器 -->

<ref bean="stringToEmployeeConverter"/>

</set>                        

</property>

</bean>

 <!-- 解决问题：

                 1.数据类型转换

                 2.数据格式

                 3.数据校验                 

                 自定义类型转换器：

                         将字符串转换为Employee对象,完成添加功能

 -->

BirthDay :<input type="text" name="birthDay"/><br><br>

//关于类型转换

private Date birthDay ;

@DateTimeFormat(pattern="yyyy-MM-dd")

private Date birthDay ;

<mvc:annotation-driven conversion-service="conversionService"/>

<mvc:annotation-driven />

Salary : <form:input path="salary"/>

@NumberFormat(pattern="#,###,###.#")

private double salary ;

public class Employee {

private Integer id;

@NotEmpty

private String lastName;

@Email

private String email;

//1 male, 0 female

private Integer gender;

private Department department;

//关于类型转换

@Past //被标注的日期必须是一个过去的日期

@DateTimeFormat(pattern="yyyy-MM-dd")

private Date birthDay ;

@NumberFormat(pattern="#,###,###.#")

private double salary ;

}

//添加员工

/** 增加@Valid注解，验证失败会报错。

 * 严重: Servlet.service() for servlet springDispatcherServlet threw exception

java.lang.NoSuchMethodError: javax.el.ExpressionFactory.newInstance()Ljavax/el/ExpressionFactory;

 */

@RequestMapping(value="/empAdd",method=RequestMethod.POST)

public String empAdd(@Valid Employee employee,BindingResult bindingResult){

System.out.println("empAdd - employee="+employee);

if(bindingResult.getErrorCount() > 0 ){

System.out.println("类型转换出错误了");

List<FieldError> fieldErrors = bindingResult.getFieldErrors();

for(FieldError fieldError : fieldErrors){

System.out.println(fieldError.getField() + " - " + fieldError.getDefaultMessage());

}

}

employeeDao.save(employee);

return "redirect:/empList";

}

@RequestMapping(value="/empAdd",method=RequestMethod.POST)

public String empAdd(@Valid Employee employee,BindingResult bindingResult){

System.out.println("empAdd - employee="+employee);

if(bindingResult.getErrorCount() > 0 ){

System.out.println("类型转换出错误了");

List<FieldError> fieldErrors = bindingResult.getFieldErrors();

for(FieldError fieldError : fieldErrors){

System.out.println(fieldError.getField() + " - " + fieldError.getDefaultMessage());

}

map.put("deptList",departmentDao.getDepartments());

return "add"; //   /WEB-INF/views/add.jsp

}

employeeDao.save(employee);

return "redirect:/empList";

}

//添加员工

@RequestMapping(value="/empAdd",method=RequestMethod.POST)

public String empAdd(Employee employee,BindingResult bindingResult){

System.out.println("empAdd - employee="+employee);

if(bindingResult.getErrorCount() > 0 ){

System.out.println("类型转换处错误了");

List<FieldError> fieldErrors = bindingResult.getFieldErrors();

for(FieldError fieldError : fieldErrors){

System.out.println(fieldError.getField() + " - " + fieldError.getDefaultMessage());

}

}

employeeDao.save(employee);

return "redirect:/empList";

}

类型转换出错误了

birthDay - Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'birthDay'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type @org.springframework.format.annotation.DateTimeFormat java.util.Date for value 's'; nested exception is java.lang.IllegalArgumentException: Unable to parse 's'

salary - Failed to convert property value of type 'java.lang.String' to required type 'double' for property 'salary'; nested exception is java.lang.NumberFormatException: For input string: "ss"

<!-- 显示所有的错误消息 -->

<form:errors path="*"/>

<form:errors path="lastName"/>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8" import="java.util.*"%>

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<!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>

<!--

1.为什么使用SpringMVC的form标签

① 快速开发

② 表单回显

2.可以通过modelAttribute指定绑定的模型属性，

若没有指定该属性，则默认从request域中查找command的表单的bean

如果该属性也不存在，那么，则会发生错误。

 -->

 <form:form action="empAdd" method="POST" modelAttribute="employee">

         <!-- 显示所有的错误消息 --><form:errors path="*"/><br><br>

         LastName : <form:input path="lastName" /> <form:errors path="lastName"/> <br><br>

         Email : <form:input path="email" /><form:errors path="email"/><br><br>

         <%

                 Map<String,String> map = new HashMap<String,String>();

                 map.put("1", "Male");

                 map.put("0","Female");

                 request.setAttribute("genders", map);

         %>

         Gender : <form:radiobuttons path="gender" items="${genders}" delimiter="<br>"/>

         DeptName :

                 <form:select path="department.id"

                                                 items="${deptList }"

                                                 itemLabel="departmentName"

                                                 itemValue="id"></form:select><br><br>

         <!-- 解决问题：

                 1.数据类型转换

                 2.数据格式

                 3.数据校验

                         1)-如何校验

                                 验证格式，需要个注解就可以了

                                 ①使用JSR 303验证标准

                                 ②加入hibernate validator验证框架

                                 ③在SpringMVC配置文件中增加<mvc:annotation-driven/>

                                 ④需要在bean的属性上增加对应验证的注解

                                 ⑤在目标方法bean类型的前面增加@Valid注解

                         2)-验证出错后，跳转到哪个页面

                         3)错误消息，如何显示，如何国际化                 

                 自定义类型转换器：

                         将字符串转换为Employee对象,完成添加功能 

         -->

BirthDay :<%-- <input type="text" name="birthDay"/> --%>        

<form:input path="birthDay"/><form:errors path="birthDay"/><br><br>

Salary : <form:input path="salary"/><br><br>

            <input type="submit" value="Submit"><br><br>

 </form:form> 

</body>

</html>

NotEmpty.employee.lastName=\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A

Email.employee.email=\u7535\u5B50\u90AE\u4EF6\u5730\u5740\u4E0D\u5408\u6CD5

Past.employee.birthDay=\u65E5\u671F\u5FC5\u987B\u662F\u4E00\u4E2A\u8FC7\u53BB\u7684\u65F6\u95F4

typeMismatch.employee.birthDay=\u4E0D\u662F\u4E00\u4E2A\u65E5\u671F\u6709\u6548\u683C\u5F0F

<!-- 声明国际化资源文件 -->

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">

<property name="basename" value="i18n"></property>

</bean>

@ResponseBody  //SpringMVC对JSON的支持

@RequestMapping("/testJSON")

public Collection<Employee> testJSON(){

return employeeDao.getAll();

}

<%@ 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>

<script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script>

<script type="text/javascript">

$(function(){ 

$("#testJSON").click(function(){

var url = this.href ;

var args = {};

$.post(url,args,function(data){

for(var i=0; i<data.length; i++){

var id = data[i].id;

var lastName = data[i].lastName ;

alert(id+" - " + lastName);

}

});

return false ;

});                

});

</script>

</head>

<body>

<a href="empList">To Employee List</a>

<br><br>

<a id="testJSON" href="testJSON">testJSON</a>

</body>

</html>

package org.springframework.http;

import java.io.IOException;

import java.io.InputStream;

public interface HttpInputMessage extends HttpMessage {

InputStream getBody() throws IOException;

}

package org.springframework.http;

import java.io.IOException;

import java.io.OutputStream;

public interface HttpOutputMessage extends HttpMessage {

OutputStream getBody() throws IOException;

}

<form action="testHttpMessageConverter" method="post" enctype="multipart/form-data">

文件: <input type="file" name="file"/><br><br>

描述: <input type="text" name="desc"/><br><br>

<input type="submit" value="提交"/>

</form>

@ResponseBody  //@ResponseBody:是将内容或对象作为Http响应正文返回

@RequestMapping("/testHttpMessageConverter")

//@RequestBody:是将Http请求正文插入方法中，修饰目标方法的入参

public String testHttpMessageConverter(@RequestBody String body){

System.out.println("body="+body);

return "Hello," + new Date();  //不再查找跳转的页面

}

/files/abc.txt    准备一个下载的文件

<a href="testResponseEntity">abc.txt</a>

@RequestMapping("testResponseEntity")

public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException{

ServletContext servletContext = session.getServletContext();

InputStream resourceAsStream = servletContext.getResourceAsStream("/files/abc.txt");

byte[] body = new byte[resourceAsStream.available()] ;

resourceAsStream.read(body);

MultiValueMap<String, String> headers = new HttpHeaders();

headers.add("Content-Disposition", "attachment;filename=abc.txt");

HttpStatus statusCode = HttpStatus.OK;

ResponseEntity<byte[]> responseEntity = new ResponseEntity<byte[]>(body, headers, statusCode);

return responseEntity ;

}