springmvc自定义类型转换器实例如下:
一. 创建实体类
package pojo;
public class GoodsModel {
private String goodsname;
private double goodsprice;
private int goodsnumber;
public String getGoodsname() {
return goodsname;
}
public void setGoodsname(String goodsname) {
this.goodsname = goodsname;
}
public double getGoodsprice() {
return goodsprice;
}
public void setGoodsprice(double goodsprice) {
this.goodsprice = goodsprice;
}
public int getGoodsnumber() {
return goodsnumber;
}
public void setGoodsnumber(int goodsnumber) {
this.goodsnumber = goodsnumber;
}
}二. 创建控制器类
package controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import pojo.GoodsModel;
@Controller
@RequestMapping("/my")
public class ConverterController {
@RequestMapping("/converter")
public String myConverter(@RequestParam("goods") GoodsModel gm,Model model) {
model.addAttribute("goods",gm);
return "showGoods";
}
}三. 创建自定义的转换器类
自定义类型转换器类需要实现 Converter 接口,重写 convert(S) 接口方法。
convert(S) 方法的功能是将源数据类型 S 转换成目标数据类型 T
package converter;
import org.springframework.core.convert.converter.Converter;
import pojo.GoodsModel;
public class GoodsConverter implements Converter<String, GoodsModel> {
public GoodsModel convert(String source) {
// 创建一个Goods实例
GoodsModel goods = new GoodsModel();
// 以“,”分隔
String stringvalues[] = source.split(",");
System.out.println(source);
if (stringvalues != null && stringvalues.length == 3) {
// 为Goods实例赋值
goods.setGoodsname(stringvalues[0]);
goods.setGoodsprice(Double.parseDouble(stringvalues[1]));
goods.setGoodsnumber(Integer.parseInt(stringvalues[2]));
return goods;
} else {
throw new IllegalArgumentException(String.format(
"类型转换失败, 需要格式'orange, 10.58,200 ',但格式是[% s ] ", source));
}
}
}四. 注册类型转换器
WEB-INF 目录下创建配置文件 springmvc-servlet.xml,并在配置文件中注册自定义类型转换器,配置文件代码如下
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" 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.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 使用扫描机制扫描控制器类,控制器类都在controller包及其子包下 --> <context:component-scan base-package="controller" /> <!-- annotation-driven用于简化开发的配置,注解DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter --> <!-- 使用resources过滤掉不需要dispatcherservlet的资源(即静态资源,例如css、js、html、images)。 在使用resources时必须使用annotation-driven,否则resources元素会阻止任意控制器被调用 --> <!-- 允许css目录下的所有文件可见 --> <mvc:resources location="/css/" mapping="/css/**" /> <!-- 允许html目录下的所有文件可见 --> <mvc:resources location="/html/" mapping="/html/**" /> <!-- 允许css目录下的所有文件可见 --> <mvc:resources location="/images/" mapping="/images/**" /> <!--注册类型转换器GoodsConverter--> <bean id="goodsConverter" class="converter.GoodsConverter"></bean> <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <set> <ref bean="goodsConverter"/> </set> </property> </bean> <mvc:annotation-driven conversion-service="conversionService" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
五. 创建相关视图
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/my/converter" method= "post">
请输入产品信息(格式为apple, 10.58,200):
<input type="text" name="goods" /><br>
<input type="submit" value="提交" />
</form>
</body>
</html>应用的 /WEB-INF/view 目录下创建信息显示页面 showGoods.jsp
您创建的商品信息如下:
<!-- 使用EL表达式取出model中的goods信息 -->
商品名称为:${goods.goodsname }
商品价格为:${goods.goodsprice }
商品名称为:${goods.goodsnumber }七. 页面访问如下:

显示结果如下:
商品名称为:grape 商品价格为:12.8 商品名称为:300
