springMvc 数据绑定,类型转换,数据校验解析

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数据绑定

注解InitBinder实现数据绑定

在SpringMVC中，bean中定义了Date，double等类型，如果没有做任何处理的话，日期以及double都无法绑定。

解决的办法就是使用spring mvc提供的@InitBinder标签

在我的项目中是在BaseController中增加方法initBinder，并使用注解@InitBinder标注，那么spring mvc在绑定表单之前，都会先注册这些编辑器，当然你如果不嫌麻烦，你也可以单独的写在你的每一个controller中。剩下的控制器都继承该类。spring自己提供了大量的实现类，诸如CustomDateEditor ，CustomBooleanEditor，CustomNumberEditor等许多，基本上够用。

自定义写法:

BaseController

package com.zefun.web.controller;import java.text.SimpleDateFormat;import java.util.Date;import org.springframework.beans.propertyeditors.CustomDateEditor;import org.springframework.stereotype.Controller;import org.springframework.web.bind.WebDataBinder;import org.springframework.web.bind.annotation.InitBinder;import com.zefun.web.editor.DoubleEditor;import com.zefun.web.editor.FloatEditor;import com.zefun.web.editor.IntegerEditor;import com.zefun.web.editor.LongEditor;@Controllerpublic class BaseController {        @InitBinder      protected void initBinder(WebDataBinder binder) {          binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"), true));          binder.registerCustomEditor(int.class, new IntegerEditor());          binder.registerCustomEditor(long.class, new LongEditor());          binder.registerCustomEditor(double.class, new DoubleEditor());          binder.registerCustomEditor(float.class, new FloatEditor());          //下面是spring自定义提供的        //binder.registerCustomEditor(int.class, new CustomNumberEditor(int.class, true));        //binder.registerCustomEditor(long.class, new CustomNumberEditor(long.class, true));     }     }

IntegerEditor

package com.zefun.web.editor;import org.springframework.beans.propertyeditors.PropertiesEditor;public class IntegerEditor extends PropertiesEditor {      @Override      public void setAsText(String text) throws IllegalArgumentException {          if (text == null || text.equals("")) {              text = "0";          }          setValue(Integer.parseInt(text));      }        @Override      public String getAsText() {          return getValue().toString();      }  }

更多配置,请下载本实例源码

StoreController

package com.zefun.web.controller;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.servlet.ModelAndView;import com.zefun.common.consts.Url;import com.zefun.web.dto.BaseDto;import com.zefun.web.entity.StoreInfo;@Controllerpublic class StoreInfoController extends BaseController{            @RequestMapping(value = Url.StoreInfo.actionSave, method = RequestMethod.POST)    @ResponseBody    public BaseDto actionSave(StoreInfo storeInfo){        System.out.println(storeInfo.toString());        System.out.println(storeInfo.getDate());        return new BaseDto(0, "fail");    }}

jsp

<%@ page language="java" contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path + "/";%><!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><script type="text/javascript" src="<%=basePath %>js/ajax.js"></script><script type="text/javascript" src="<%=basePath %>js/jquery-1.9.1.min.js"></script><body><div><input type="text" name="date"><input type="text" name="id"><input type="button" value="数据绑定" onclick="initBuild()"></div>function initBuild(){var date = jQuery("input[name='date']").val();var id = jQuery("input[name='id']").val();jQuery.ajax({url: baseUrl+"store/action/save",        data: "date="+date+"&id="+id,        type:"POST",        success: function(data) {           console.log(data.msg);        }});}</script></body></html>

结果

StoreInfo [date=Wed Dec 12 00:00:00 CST 1990, id=4]Wed Dec 12 00:00:00 CST 1990

配置converter实现数据绑定

集成converter接口进行重写转换器

package com.zefun.web.converter;import org.springframework.core.convert.converter.Converter;import org.springframework.stereotype.Component;import com.zefun.web.entity.Employee;/** * 1.自定义类型转换器,比如在表单中请求epms的时候 ,提交的数据格式是//GG-gg@atguigu.com-0-105 *      就会返回一个Employee类型的bean,而在请求的方法参数中这样写(@RequestParam(value="表单name") Employee employee) *      在强制转换的时候就会使用该转换器 * 2.配置转换器 在xml中有详细讲解 */@Component(value="employeeConverter")public class EmployeeConverter implements Converter<String, Employee> {    public Employee convert(String source) {        if (source != null) {            String[] vals = source.split("-");            // GG-gg@atguigu.com-0-105            if (vals != null && vals.length == 4) {                String lastName = vals[0];                String email = vals[1];                Integer gender = Integer.parseInt(vals[2]);                Employee employee = new Employee(null, lastName, email, gender);                System.out.println(source + "--convert--" + employee);                return employee;            }        }        return null;    }}

将此转换器在mvc配置文件中注册

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><property name= "webBindingInitializer" ref= "webBindingInitializer"/></bean><bean id= "conversionService" class= "org.springframework.format.support.FormattingConversionServiceFactoryBean">    <property name= "converters">       <list>        <bean class= "com.zefun.web.converter.EmployeeConverter"/>        </list>    </property></bean><bean id= "webBindingInitializer" class= "org.springframework.web.bind.support.ConfigurableWebBindingInitializer"><property name= "conversionService" ref= "conversionService"/></bean>

如果使用的是默认的<mvc:annotation-driven/>来注册的adapter,那么久不需要上面的配置,直接在其中配置converterService属性即可

<mvc:annotation-driven conversion-service="conversionService"/><bean id= "conversionService" class= "com.zefun.web.converter.EmployeeConverter"></bean>

如果在上述注册了FormattingConversionServiceFactoryBean或者是ConversionServiceFactoryBean,就可以在entity中的属性中使用注解来进行数据绑定了

    @DateTimeFormat(pattern="yyyy-MM-dd")    private Date birth;        @NumberFormat(pattern="#,###,###.#")    private Float salary;

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springMvc 数据绑定,类型转换,数据校验 解析

数据绑定

注解InitBinder实现数据绑定

配置converter实现数据绑定

springMvc 数据绑定,类型转换,数据校验解析