Spring MVC HTTP状态400-

Question

I am trying to create a program where I am getting the error 我正在尝试创建一个出现错误的程序

Edit.jsp 编辑.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<body>
<c:if test="${session_username != null }">Hello ${session_username}!</c:if>
    <font face="verdana" size="2">
        ${welcomeMessage} <BR><BR>
        <form:form action="${pageContext.request.contextPath}/editemployee" method="POST" modelAttribute="editForm">
            <form:errors path="studenterrors" />
            <table>
                <tr>
                    <td colspan="2" align="center">Spring MVC Form Demo - Edit</td>
                </tr>
                <tr>
                    <td>User Name</td>
                    <td><form:input path="username" /></td>
                </tr>
                <tr>
                    <td>First Name</td>
                    <td><form:input path="firstname" /></td>
                </tr>
                <tr>
                    <td>Last Name</td>
                    <td><form:input path="lastname" /></td>
                </tr>
                <tr>
                    <td>Mobile No.</td>
                    <td><form:input path="mobileno" /></td>
                </tr>
                <tr>
                    <td>Password</td>
                    <td><form:password path="password" /></td>
                </tr>
                <tr>
                    <td>Email</td>
                    <td><form:input path="email" /></td>
                </tr>
                <tr>
                    <td>BirthDate (mm/dd/yyyy)</td>
                    <td><form:input path="birthdate" /></td>
                </tr>
                <tr>
                    <td>Profession</td>
                    <td><form:select path="profession" items="${professionList}" /></td>
                </tr>
                <tr>
                    <td colspan="2" align="center"><input type="submit" value="Submit" /></td>
                </tr>                                   
            </table>                                        
        </form:form>
    </font> 
</body>
</html>

LoginSuccess.java LoginSuccess.java

package java4s;


import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
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 java4s.EmployeeService;

@Controller
public class LoginSuccessController {

    @Autowired
    EmployeeService emp_service;

    @RequestMapping(value = "/editemployee", method=RequestMethod.POST)
    public ModelAndView EditSaveMyInfo(ModelMap model, @ModelAttribute("editForm") Employee employee) {

        model.addAttribute("message", "Information Updated");
        return new ModelAndView("EditSuccess",model);
    }

}

Whenever I click on submit button, I get HTTP Status 400 - error. 每当我单击“提交”按钮时，都会收到HTTP Status 400 -错误。 But when I remove @ModelAttribute("editForm") Employee employee from the function EditSaveMyInfo , the error doesnt appears? 但是，当我从功能EditSaveMyInfo删除@ModelAttribute("editForm") Employee employee ，错误不会出现吗？

How can I solve the error? 我该如何解决错误？

EDIT 编辑

Employee.java Employee.java

package java4s;

import java.util.Date;

public class Employee {

    private String userid;
    private String firstname;
    private String lastname;    
    private String mobileno;
    private String username;
    private String password;
    private String email;
    private Date birthDate;
    private String profession;
    private String studenterrors;

    public String getUserid()
    {
        return userid;
    }
    public void setUserid(String userid)
    {
        this.userid = userid;
    }

    public String getUsername()
    {
        return username;
    }
    public void setUsername(String username)
    {
        this.username = username;
    }
    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 getMobileno()
    {
        return mobileno;
    }
    public void setMobileno(String mobileno)
    {
        this.mobileno = mobileno;
    }

    public String getPassword()
    {
        return password;
    }
    public void setPassword(String password)
    {
        this.password = password;
    }
        public String getEmail()
    {
        return email;
    }
    public void setEmail(String email)
    {
        this.email = email;
    }
        public Date getBirthdate()
    {
        return birthDate;
    }
    public void setBirthdate(Date birthDate)
    {
        this.birthDate = birthDate;
    }
        public String getProfession()
    {
        return profession;
    }
    public void setProfession(String profession)
    {
        this.profession = profession;
    }
        public String getstudenterrors()
    {
        return studenterrors;
    }
    public void setstudenterrors(String studenterrors)
    {
        this.studenterrors = studenterrors;
    }
}

Answer 1

use @RequestBody @Valid Employee employee instead of @ModelAttribute("editForm") Employee employee 使用@RequestBody @Valid Employee employee而不是@ModelAttribute("editForm") Employee employee

and you controller become 而你的控制者成为

@RequestMapping(value = "/editemployee", method=RequestMethod.POST)
    public ModelAndView EditSaveMyInfo(ModelMap model, @RequestBody @Valid Employee employee,BindingResult result) {
    if (result.hasErrors()) {
        throw new BadRequestException();
    }   model.addAttribute("message", "Information Updated");
        return new ModelAndView("EditSuccess",model);
    }

binding result object is used for catch bad request exception. 绑定结果对象用于捕获不良请求异常。 this is the spring standard 这是春天的标准

Answer 2

Your problem is that the binding between the form and the model(Employee) was failed. 您的问题是表单和模型（雇员）之间的绑定失败。

Change your controller ( Just read it very carefully, you will get a picture about how binding actually works ) to : 将您的控制器更改为：（ 只需仔细阅读，您将获得有关绑定实际工作方式的图片 ）：

package java4s;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
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 java4s.EmployeeService;

@Controller
public class LoginSuccessController {

    @Autowired
    EmployeeService emp_service;

   //Give you a form (edit.jsp) as response after binding happens
   @RequestMapping(value = "/employeeform", method=RequestMethod.POST)
    public ModelAndView doBinding() {
       ModelAndView mv = new ModelAndView("edit", "employee", new Employee()); 
            return mv;

    }


  // Now the form comes here after it gets submitted.
 // And you can start populating the fields
    @RequestMapping(value = "/saveemployee", method=RequestMethod.POST)
    public ModelAndView EditSaveMyInfo(ModelMap model, @ModelAttribute("employee") Employee employee) {

        model.addAttribute("message", "Information Updated");
        return new ModelAndView("EditSuccess",model);
    }

}

And change your edit.jsp to : 并将您的edit.jsp更改为：

(Note that model attribute is changed to modelAttribute="employee" , because I mapped it with new ModelAndView("edit", "employee", new Employee()); in doBinding(...) controller) （请注意， 模型属性已更改为 modelAttribute="employee" ，因为我在doBinding(...)控制器中使用new ModelAndView("edit", "employee", new Employee());映射了它）
I changed action=.. path to /saveemployee 我将action=..路径更改为/ saveemployee

Add <context:annotation-config /> there in your spring-servlet.xml also xmlns:context="http://www.springframework.org/schema/context" in <beans.. to enable it. 在您的spring-servlet.xml中添加<context:annotation-config /> ，在<beans..也添加xmlns:context="http://www.springframework.org/schema/context"以启用它。

  <%@page contentType="text/html" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <html> <body> <c:if test="${session_username != null }">Hello ${session_username}!</c:if> <font face="verdana" size="2"> ${welcomeMessage} <BR><BR> <form:form action="${pageContext.request.contextPath}/saveemployee" method="POST" modelAttribute="employee"> <form:errors path="studenterrors" /> <table> <tr> <td colspan="2" align="center">Spring MVC Form Demo - Edit</td> </tr> <tr> <td>User Name</td> <td><form:input path="username" /></td> </tr> <tr> <td>First Name</td> <td><form:input path="firstname" /></td> </tr> <tr> <td>Last Name</td> <td><form:input path="lastname" /></td> </tr> <tr> <td>Mobile No.</td> <td><form:input path="mobileno" /></td> </tr> <tr> <td>Password</td> <td><form:password path="password" /></td> </tr> <tr> <td>Email</td> <td><form:input path="email" /></td> </tr> <tr> <td>BirthDate (mm/dd/yyyy)</td> <td><form:input path="birthdate" /></td> </tr> <tr> <td>Profession</td> <td><form:select path="profession" items="${professionList}" /></td> </tr> <tr> <td colspan="2" align="center"><input type="submit" value="Submit" /></td> </tr> </table> </form:form> </font> </body> </html>

Now request the form with --> ...../employeeform 现在使用-> ..... / employeeform申请表格
After the form gets submitted it goes to --> EditSaveMyInfo() ( action = "/saveemployee" ) 提交表单后，转到-> EditSaveMyInfo() （ action =“ / saveemployee” ）

Note : I don't expect my answer to directly solve your problem (because the errors could come from somewhere else in your codes), but I just want you to get the binding process in spring mvc . 注意： 我不希望我的答案能直接解决您的问题（因为错误可能来自代码中的其他地方），但是我只希望您在spring mvc中获得绑定过程 。

Answer 3

HTTP STATUS 400 means some thing wrong with the parameters passing from front end to back end. HTTP STATUS 400表示从前端到后端传递的参数有些错误。 @ModelAttribute tells get value from session, I suppose to use @RequestParam should be used at your situation which is getting parameters from http request. @ModelAttribute告诉从会话中获取值，我想在您从HTTP请求中获取参数的情况下使用@RequestParam 。

@RequestMapping(value = "/editemployee", method=RequestMethod.POST)
public ModelAndView EditSaveMyInfo(ModelMap model, @RequestParam("employee") Employee employee) {
    model.addAttribute("message", "Information Updated");
    return new ModelAndView("EditSuccess",model);
} 

<form:form action="${pageContext.request.contextPath}/editemployee" method="POST">

Spring MVC HTTP状态400-

问题描述

3 个解决方案

解决方案1
1 2016-01-22 07:04:52

解决方案2
1 2016-01-22 15:14:15

解决方案3
0 2016-01-22 07:06:16

Spring MVC HTTP状态400-

问题描述

3 个解决方案

解决方案1 1 2016-01-22 07:04:52

解决方案2 1 2016-01-22 15:14:15

解决方案3 0 2016-01-22 07:06:16

解决方案1
1 2016-01-22 07:04:52

解决方案2
1 2016-01-22 15:14:15

解决方案3
0 2016-01-22 07:06:16