Question

我选择学习java和spring MVC web框架来创建Spring Boot应用程序。

目标是创建一个简单的html表单并将java对象传递给表单。

注意：我使用的模板引擎是Thymeleaf

在我的情况下，这是String Toolkit Suite中引发的异常。

org.springframework.beans.NotReadablePropertyException: Invalid property 'names' of bean class [testingmvc.FormFields]: Bean property 'names' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

我发现问题NotReadablePropertyException: Invalid property 'moduleName' of bean class引发了类似的问题，但这是java.lang.String在链接中引发的异常。

html代码位于

＆＃13;

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">

<head lang="en">
  <title>Search</title>
</head>

<body>
  <h4 class="indigo-text center">Please enter a search term</h4>
  <form action="/post_search" th:object="${fields}" method="POST">
    <div class="row center">
      <div class="input-field col s6 offset-s3">
        <i class="mdi-action-search prefix"></i>
        <input id="names" th:field="*{names}" name="names" type="text" class="validate" placeholder="please enter your name" />
        <input id="address" name="address" type="text" class="validate" th:field="*{address}" placeholder="please enter your address" />
        <label for="search">Search</label>
        <button type="submit">submit</button>
      </div>
    </div>
  </form>
</body>

</html>

＆＃13;

我的Java控制器代码Java低于

package testingmvc;

import java.util.*;

import javax.servlet.http.HttpServletRequest;

import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
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.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

@Controller
public class TestController {
    @RequestMapping("/welcome")
    public ModelAndView firstPage() {
        return new ModelAndView("welcome");
    }
    @RequestMapping("/thyme")
    public ModelAndView thyme(@RequestParam( value = "product" , required=false) String qString,Model model) {
        System.out.println(qString);
        model.addAttribute("name", "John Public");  
        return new ModelAndView("sample");
    }
    @RequestMapping(value="/form_test",method = RequestMethod.GET)
    public String form(@ModelAttribute("fields") FormFields fields,BindingResult res, Model model)
    {
        model.addAttribute("fields", fields);
        return "form";
    }
    @RequestMapping(value = "/post_search", method = RequestMethod.POST)
    public String formTest(@ModelAttribute("fields") FormFields fields,BindingResult res,HttpServletRequest request,RedirectAttributes redirect, Model model){
        //System.out.println("This is request parameters: "+request.getParameterNames());
        Enumeration<String> t=request.getParameterNames();
        while(t.hasMoreElements())
        {
            System.out.println("This is request parameters: "+t.nextElement());
        }
        model.addAttribute("fields", fields);
        return "welcome";
    }

}
class FormFields{
    private String names;
    private String address;
    public void setName(String name) {
        this.names=name;

    }
    public void setAddress(String address) {
        this.address=address;

    }   
    public String getName(String name) {
        return this.names;

    }   
    public String getAddress(String address) {
        return this.address;

    }       
}

获取Spring Boot运行的Java代码

package testingmvc;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class BootGradleApplication {

    public static void main(String[] args) {
        SpringApplication.run(BootGradleApplication.class, args);
    }
}

问题

我想通过一个有效的例子来理解。如何在没有异常的情况下成功地将Java对象注入到html表单中？

Answer 1

您遇到了问题getNames(String name)。当Thymeleaf期望为零时，它需要一个参数 - 它只是找不到合适的吸气剂。

签名应更改为getNames()。

如果您查看the javadocs，可以看到：

尝试获取不可读的属性值时抛出异常，因为没有getter方法。

Answer 2

FormFields课程中的getter不正确。只是一个小错字，你在方法名称中缺少''。

吸气者不应该接受任何争论。

以下是有效版本：

class FormFields{
    private String names;
    private String address;

    public void setNames(String names) {
        this.names=names;

    }
    public void setAddress(String address) {
        this.address=address;

    }   
    public String getNames() {
        return this.names;

    }   
    public String getAddress() {
        return this.address;

    }       
}

NotReadablePropertyException：无效的属性＆＃39;名称＆＃39;豆类

2 个答案: