在用springMVC <form:form>表单时，喜欢报的错误如下所示：
错误的Controller层的代码如下：
1 @RequestMapping(value = "test.do",method = RequestMethod.POST) 2 public String test(Student stu,Model model){ 3 stu = new Student(); 4 stu.setAge(16); 5 stu.setName("zyh"); 6 stu.setId(39); 7 // model.addAttribute("stu",stu); 8 return "springform";
其中BindingResult---对应于@ModelAttribute("什么什么")---->对应本例而言你应该修改为：@ModelAttribute("stu")这个stu是<form:form modelAttribute=''stu''>中的stu.
r plain target object for bean name 'stu' available as request attribute对应于：model.addAttribute("stu",实体对象);
破解错误的只要两者有一个就可以了，两者都有也是可以的。
正确的Controller的代码形式一如下加上model.addAttribute("stu",实体对象)：
1 @RequestMapping(value = "test.do",method = RequestMethod.POST) 2 public String test(Student stu,Model model){ 3 stu = new Student(); 4 stu.setAge(16); 5 stu.setName("zyh"); 6 stu.setId(39); 7 model.addAttribute("stu",stu); 8 return "springform"; 9 }
正确的Controller的代码形式二如下加上@ModelAttribute("stu")
1 @RequestMapping( value = "test.do",method = RequestMethod.POST) 2 public String test(@ModelAttribute("stu") Student stu,Model model){ 3 stu = new Student(); 4 stu.setAge(16); 5 stu.setName("zyh"); 6 stu.setId(39); 7 return "springform"; 8 }
正确的Controller的代码形式三如下：即加上model.addAttribute("stu"),也加上@ModelAttribute("stu")
代码如下：
1 @RequestMapping( value = "test.do",method = RequestMethod.POST) 2 public String test(@ModelAttribute("stu") Student stu,Model model){ 3 stu = new Student(); 4 stu.setAge(16); 5 stu.setName("zyh"); 6 stu.setId(39); 7 model.addAttribute("stu",stu); 8 return "springform"; 9 }
其中跳到springform.jsp的代码如下：
1 <%-- 2 Created by IntelliJ IDEA. 3 User: qinlinsen 4 Date: 2017-07-18 5 Time: 17:12 6 To change this template use File | Settings | File Templates. 7 --%> 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 9 <%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %> 10 <%--使EL表达式生效的语句--%> 11 <%@ page isELIgnored="false" %> 12 <html> 13 <head> 14 <title>spring form</title> 15 </head> 16 <body> 17 <form:form action="/webtest/query.do" method="post" modelAttribute="stu"> 18 <table> 19 <tr> 20 <td> 21 Name 22 </td> 23 <td> 24 <form:input path="name"/> 25 </td> 26 </tr> 27 <tr> 28 <td> 29 age 30 </td> 31 <td> 32 <form:input path="age"/> 33 </td> 34 </tr> 35 <tr> 36 <td> 37 id 38 </td> 39 <td> 40 <form:input path="id"/> 41 </td> 42 </tr> 43 <tr> 44 <td colspan="2"> 45 <input type="submit" value="submit"> 46 </td> 47 </tr> 48 49 </table> 50 </form:form> 51 hello spring form. 52 </body> 53 </html>
Student类的代码如下：
1 package com.supwisdom.domain; 2 3 /** 4 * Created by qinlinsen on 2017-07-18. 5 */ 6 public class Student { 7 private String name;//学生姓名 8 private Integer age;//学生年龄 9 private Integer id;//学生省份证号 10 11 public String getName() { 12 return name; 13 } 14 15 public void setName(String name) { 16 this.name = name; 17 } 18 19 public Integer getAge() { 20 return age; 21 } 22 23 public void setAge(Integer age) { 24 this.age = age; 25 } 26 27 public Integer getId() { 28 return id; 29 } 30 31 public void setId(Integer id) { 32 this.id = id; 33 } 34 }