springmvc除了自带的部分类型转换之外，还可以自定义类型转换器，按照以下步骤：
1、写一个类实现Converter接口
package com.hy.springmvc.entities;
import org.springframework.core.convert.converter.Converter;
import com.google.gson.Gson;
public class DepartmentConvertor implements Converter<String, Department> {
@Override
public Department convert(String source) {
System.out.println("com.hy.springmvc.entities.DepartmentConvertor: "
+ source);
Department department = new Gson().fromJson(source, Department.class);
return department;
}
}
2、引入ConversionServiceFactoryBean,将自己写的类注入到bean
<bean id="conversionService"
class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<list>
<bean class="com.hy.springmvc.entities.DepartmentConvertor"></bean>
</list>
</property>
</bean>
3、在<mvc:annotation-driven>里面标注属性conversion-service
<mvc:annotation-driven conversion-service="conversionService"> </mvc:annotation-driven>
这样在类型转化的过程中就会自动调用这个转换器
