使用initbinder做验证的情况一般会在此controller中提交的数据需要有一些是业务性质的,也即比较复杂的验证情况下才会使用。大部份简单的表单验证,使用annotation验证即可以解决。
annotation验证使用方法可参见:http://www.zzvips.com/article/155119.html
这里需要注意的一点:initbinder和annotation两种验证只能二选一,如果使用了initbinder,就不能使用annotation验证。
前面的web.xml和spring.xml的配置就不再重复,可参见上面链接中的配置。一模一样。
直接上代码:
1、user5 model实体类
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package com.my.controller.bean; import java.util.date; public class user5 { private long id; private string name; private string password; private date createtime; private int age; public long getid() { return id; } public void setid( long id) { this .id = id; } public string getname() { return name; } public void setname(string name) { this .name = name; } public string getpassword() { return password; } public void setpassword(string password) { this .password = password; } public date getcreatetime() { return createtime; } public void setcreatetime(date createtime) { this .createtime = createtime; } public int getage() { return age; } public void setage( int age) { this .age = age; } } |
2、新增一个validator:
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package com.my.controller.validator; import org.springframework.stereotype.component; import org.springframework.validation.errors; import org.springframework.validation.validationutils; import org.springframework.validation.validator; import com.my.controller.bean.user5; @component public class testvalidator implements validator { @override public boolean supports( class <?> paramclass) { return user5. class .equals(paramclass); } @override public void validate(object obj, errors errors) { user5 user = (user5) obj; validationutils.rejectifemptyorwhitespace(errors, "name" , "valid.name" , null , "" ); if (user.getage() < 18 ) { errors.rejectvalue( "age" , "valid.agemin" , new object[]{ "age" , 18 }, "年龄不能小于{1}岁" ); } } } |
这里需要加入@component,注入di
3、controller
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package com.my.controller; import java.util.linkedhashmap; import java.util.list; import java.util.map; import javax.validation.valid; import org.springframework.beans.factory.annotation.autowired; import org.springframework.beans.factory.annotation.qualifier; import org.springframework.stereotype.controller; import org.springframework.validation.bindingresult; import org.springframework.validation.fielderror; import org.springframework.validation.validator; 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.requestmapping; import org.springframework.web.bind.annotation.requestmethod; import org.springframework.web.servlet.modelandview; import com.my.controller.bean.user5; @controller @requestmapping (value= "binder" ) public class testinitbindercontroller { @autowired @qualifier (value= "testvalidator" ) private validator validator; @initbinder private void initbinder(webdatabinder binder) { binder.setvalidator(validator); } @requestmapping (method=requestmethod.get) public string index() { return "/testinitbinder/index" ; } @requestmapping (value= "add" , method=requestmethod.post) public modelandview add( @modelattribute @valid user5 user, bindingresult result) { modelandview view = new modelandview( "testinitbinder/index" ); view.addobject( "user" , user); if (result.haserrors()) { list<fielderror> errs = result.getfielderrors(); map<string, string> maperrors = new linkedhashmap<string, string>(); for (fielderror err : errs) { system.out.println( "objectname:" + err.getobjectname() + "\tfieldname:" + err.getfield() + "\tfieldvalue:" + err.getrejectedvalue() + "\tmessage:" + err.getdefaultmessage()); maperrors.put(err.getfield(), err.getdefaultmessage()); view.addobject( "errors" , maperrors); } return view; } return view; } } |
把validator注入到controller中。
事实上,使用initbinder,在add controller中的err.getdefaultmessage()方法是取不到对应正确的message的。可以看最后的输入打印结果。
4、view
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<%@ page language= "java" contenttype= "text/html; charset=utf-8" pageencoding= "utf-8" %> <%@ taglib uri= "http://java.sun.com/jsp/jstl/core" prefix= "c" %> <%@ taglib uri= "http://java.sun.com/jsp/jstl/fmt" prefix= "fmt" %> <%@ taglib uri= "http://java.sun.com/jsp/jstl/functions" prefix= "fn" %> <%@ taglib prefix= "st" uri= "http://www.springframework.org/tags" %> <%@ taglib prefix= "form" uri= "http://www.springframework.org/tags/form" %> <!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>init binder</title> </head> <body> <form:form action= "/testspringmvc1/binder/add" method= "post" modelattribute= "user5" > user name:<input type= "text" id= "name" name= "name" value= "${user.name}" /><br/> password:<input type= "text" id= "password" name= "password" value= "${user.password}" /><br/> age:<input type= "text" id= "age" name= "age" value= "${user.age}" /><br/> <input type= "submit" value= "add" /> <hr/> error:<br/> <form:errors path= "*" ></form:errors> </form:form> </body> </html> |
注意,这里只能使用<form:errors />来取得错误信息,且,这个<form:errors/>一定要在<form:form/>当中。
5、结果测试
点击add button:
打印输出:
可以看到,这里取不到错误的正确信息
事实上,在一个非常复杂表单页面,里头所提交的数据验证有一定的业务逻辑性时,initbinder应该都不多用,因为很多时候我们可以使用一个map,把errors插入进去,在页面读取即可。比如:
map<string, string> errors;
errors.add("name", "user name can not be empty!");
:
:
页面中只需要使用:
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<span style= "color:red;" >${errors.name}<span> |
即可。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://www.cnblogs.com/HD/p/4123686.html