SpringMVC自定义类型转化器
1、ConversionService是Spring类型转换体系的核心接口。可以利用ConversionServiceFactoryBean在Spring的IOC容器中定义一个ConversionService。
2、我们自定义一个表单数据格式，直接转换成VO对象。输入的格式：GG-gwolf_2010@126.com-0-105。在表单输入框定义一个表单。
<%@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="testConversionServiceConverter" metho="post">
<!-- lastname-email-gender-department.id 例如：GG-gwolf_2010@126.com-0-105 -->
employee:<input type="text" name="employee"/>
<input type="submit" value="Submit"/>
</form>
</body>
3、在SpringMVC控制层实现保存方法：
package com.gwolf.springmvc.handlers;
import java.util.Map;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
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 com.gwolf.springmvc.dao.DepartmentDao;
import com.gwolf.springmvc.dao.EmployeeDao;
import com.gwolf.springmvc.domain.Employee;
@Controller
public class EmployeeHandler {
@Autowired
private EmployeeDao employeeDao;
@Autowired
private DepartmentDao departmentDao;
@RequestMapping("/testConversionServiceConverter")
public String testConverter(@RequestParam("employee") Employee employee) {
System.out.println("save:" + employee);
employeeDao.save(employee);
return "emps";
}
}
4、现在表单的employee字符串是不能转化成VO对象的。我们需要实现一个转化器。
package com.gwolf.springmvc.domain;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;
@Component
public class EmployeeConverter implements Converter<String, Employee>{
@Override
public Employee convert(String source) {
if(source!=null) {
String[] vals = source.split("-");
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);
return employee;
}
}
return null;
}
}
5、在SpringMVC配置文件中注册上面声明转化器：
<?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-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
<!-- 配置自动扫描的包 -->
<context:component-scan base-package="com.gwolf.springmvc">
</context:component-scan>
<!-- 配置视图解析器，如何把handler方法返回值解析为实际的物理视图 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
<property name="order" value="100"></property>
</bean>
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/springmvc/helloworld"></mvc:mapping>
<bean class="com.gwolf.springmvc.interceptors.SecondInterceptor"></bean>
</mvc:interceptor>
<bean class="com.gwolf.springmvc.interceptors.FirstInterceptor"></bean>
</mvc:interceptors>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="i18n"></property>
</bean>
<mvc:view-controller path="/success" view-name="success"/>
<mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>
<mvc:default-servlet-handler/>
<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
<ref bean="employeeConverter"/>
</set>
</property>
</bean>
</beans>
6、启动程序，提交表单，查看程序是否转化成功。控制层已经正确的打印了vo对象的值。
