【SpringMVC】数据处理-数据绑定流程分析

        SpringMVC主框架将ServletRequest对象及目标方法的入参实例传递给webDataBinderFactory实例，以创建

DataBinder实例对象DataBinder调用装配在SpringMVC上下文中的ConversionService组件进行数据类型转换，数据

格式化工作，将Servlet中的请求信息填充到入参对象中调用Validator组件对已经绑定了请求消息的入参对象进行数据

合法性校验，并最终生成数据绑定结果BindingData对象SpringMVC抽取Bin定Result中的入参对象和校验错误对象，

将他们赋给处理方法的相应入参

input.jsp： <formaction="testConversionServiceConverter"method="post">               Employee:<inputtype="text"name="employee"> form> 控制器： @Controller publicclass SpringMVCTest {     @Autowired     private EmployeeDaoemployeeDao;     @RequestMapping("/testConversionServiceConverter")     publicString testConverter(@RequestParam("employee") Employeeemployee){        System.out.println("save:"+employee);        employeeDao.save(employee);        return"redirect:/emps";     } } 上面控制器中，testConverter（）接受的是字符串，如何转为实体对象呢？ 下面在springmvc.xml中引入转换器： <mvc:annotation-drivenconversion-service="conversionService">mvc:annotation-driven>             <beanid="conversionService"class="org.springframework.context.support.ConversionServiceFactoryBean">        <propertyname="converters">            <set>               <ref bean="employeeConverter"/>            set>        property>     bean>   转换器：加上@Component后，类被标注为bean，相当于"employeeConverter" class=""> @Component publicclass EmployeeConverter implements Converter {     @Override     public Employee convert(Stringsource) {        if (source !=null) {            String[] vals=source.split("-");            //GG-[email protected]-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);               returnemployee;            }        }        returnnull;     } }