Question

当我将它放在Spring的<form:errors>标记内时，

<form:form>标记没有显示错误消息。

如果<form:errors>标记超出<form:form>标记，则会显示错误消息。我打印了绑定结果的错误，它显示如下错误：

[Field error in object 'student1' on field 'lastname': rejected value []; codes [Size.student1.lastname,Size.lastname,Size.java.lang.String,Size]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [student1.lastname,lastname]; arguments []; default message [lastname],16,6]; default message [Size.student1.**lastname**]]

注意：如果我将<form:errors>置于<form:form>标记内，则无效。

这是JSP代码：

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <title>Contact Manager</title>
    <style>
        .errStyle{
        color:red;}
    </style>

</head>
<body>
<h2>${headerName}</h2>
<!-- This line shows the error messages of input binding exception. -->
<!--<form:errors path="student1.*" cssClass="errStyle"/> this line shows the error messages-->
<form:form method="post" action="/SampleTutorials/student/addBean.html">

      <label>Last Names</label>
        <input type="text" name="lastname"/>
    <table>
    <tr>
        <td><label>First Name</label></td>
        <td><input type="text" name="firstname"/></td> 
    </tr>
    <tr>
        <td><label>Last Names</label></td>
        <td><input type="text" name="lastname"/>
         <form:errors path="student1.lastname"> </form:errors>
        </td>
    </tr><!--**** Here it doesnt shows the error message -->
    <tr>
        <td><label>DOB</label></td>
        <td><input type="text" name="dob"/></td>
    </tr>
    <tr>
        <td><label>Email</label></td>
        <td><input type="text" name="email"/></td>
    </tr>
    <tr>
        <td><label>Telephone</label></td>
        <td><input type="text" name="telephone"/></td>
    </tr>
    <tr>
        <td><label>Skillset</label></td>
        <td>
            <select multiple name="skillSet">
              <option value="J2EE">J2EE</option>
              <option value="J2SE">J2SE</option>
              <option value="Spring">Spring</option>
              <option value="Hibernate">Hibernate</option>
            </select>
        </td>
    </tr>
    <tr>
        <td><label>Flat Number : </label></td>
        <td><input type="text" name="address.flatNumber"/></td>
    </tr>
    <tr>
        <td><label>Building Name : </label></td>
        <td><input type="text" name="address.buildingName"/></td>
    </tr>
    <tr>
        <td><label>City : </label></td>
        <td><input type="text" name="address.city"/></td>
    </tr>

    <tr>
        <td colspan="2">
            <input type="submit" value="Add Contact"/>
        </td>
    </tr>
</table>  

</form:form>
</body>
</html>

控制器方法：

@RequestMapping(value="/addBean.html", method = RequestMethod.POST)
public ModelAndView addContactFromBean(@ModelAttribute("student1") @Valid ContactBean student1, BindingResult result){

    System.out.println("Inside addContactFromBean");

    if(result.hasErrors()){ // this binding result checks for error
        ModelAndView model = new ModelAndView("addStudent");
        System.out.println("Some error occured in input.");
        System.out.println(result.getAllErrors());
        return model;
    }

    ModelAndView model = new ModelAndView("viewStudent");

    System.out.println("Student Bean : "+student1.toString());
    model.addObject("student1", student1);

    System.out.println("View Name :->> "+model.getViewName());
    return model;
}

Spring Bean：

package com.springTut;

import java.util.List;

import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;

public class ContactBean {
**@NotEmpty
private String firstname;**
**@Size( min=6, max=16, message="Size.student1.lastname")**
**private String lastname;**
private String email;
private String dob;
private Long telephone;
private List<String> skillSet;
private AddressBean address;

@Override
public String toString() {
    return "ContactBean [firstname=" + firstname + ", lastname=" + lastname + ", email=" + email + ", telephone="
            + telephone + ", skillSet=" + skillSet + ", address=" + address + "--.]";
}
public String getDob() {
    return dob;
}
public void setDob(String dob) {
    this.dob = dob;
}
public List<String> getSkillSet() {
    return skillSet;
}
public void setSkillSet(List<String> skillSet) {
    this.skillSet = skillSet;
}
public String getFirstname() {
    return firstname;
}

public void setFirstname(String firstname) {
    this.firstname = firstname;
}
public String getLastname() {
    return lastname;
}
public void setLastname(String lastname) {
    this.lastname = lastname;
}
public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public Long getTelephone() {
    return telephone;
}
public void setTelephone(Long telephone) {
    this.telephone = telephone;
}
public AddressBean getAddress() {
    return address;
}
public void setAddress(AddressBean address) {
    this.address = address;
}
}

Answer 1

尝试正确使用弹簧形式作为模型属性对象和我的意思的内部属性。

以您的形式

<form:form method="post" action="/SampleTutorials/student/addBean.html" attribute="student">

...
<td><form:input type="text" path="lastname"/>
     <form:errors path="lastname"> </form:errors>
</td>
...

如果在这种情况下也失败了，请告诉我

Answer 2

绑定和验证错误已在模型中注册。标签从模型中检索这些错误以用于显示目的。如果标记嵌套在form：form标记内，则有效错误键或路径是form：form标签中的modelAttribute属性与您指定的路径的组合。在您的情况下，modelAttribute不是显式的。更改您的表单如下

<form:form method="post" action="/SampleTutorials/student/addBean.html" modelAttribute="student1">

      <label>Last Names</label>
        <input type="text" name="lastname"/>
    <table>
    <tr>
        <td><label>First Name</label></td>
        <td><input type="text" name="firstname"/></td> 
    </tr>
    <tr>
        <td><label>Last Names</label></td>
        <td><input type="text" name="lastname"/>
         <form:errors path="lastname"> </form:errors>
        </td>
    </tr>
    <tr>
        <td><label>DOB</label></td>
        <td><input type="text" name="dob"/></td>
    </tr>
    <tr>
        <td><label>Email</label></td>
        <td><input type="text" name="email"/></td>
    </tr>
    <tr>
        <td><label>Telephone</label></td>
        <td><input type="text" name="telephone"/></td>
    </tr>
    <tr>
        <td><label>Skillset</label></td>
        <td>
            <select multiple name="skillSet">
              <option value="J2EE">J2EE</option>
              <option value="J2SE">J2SE</option>
              <option value="Spring">Spring</option>
              <option value="Hibernate">Hibernate</option>
            </select>
        </td>
    </tr>
    <tr>
        <td><label>Flat Number : </label></td>
        <td><input type="text" name="address.flatNumber"/></td>
    </tr>
    <tr>
        <td><label>Building Name : </label></td>
        <td><input type="text" name="address.buildingName"/></td>
    </tr>
    <tr>
        <td><label>City : </label></td>
        <td><input type="text" name="address.city"/></td>
    </tr>

    <tr>
        <td colspan="2">
            <input type="submit" value="Add Contact"/>
        </td>
    </tr>
</table>  

</form:form>

为什么<form：errors>标签没有显示Spring的<form：form>标签内的错误消息？

2 个答案: