我知道这个主题有很多线程，我已经尝试了其中的大多数，但仍然无法解决我的问题。我正在使用SpringMVC and MongoDB我想要实现的是，我将在数据库中存储一些数据，然后将其从数据库检索回选择选项。这是我的代码。
Jsp页面..
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="f"%>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<!DOCTYPE html>
<html lang="en">
<title>Master Referral</title>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width= device-width, initial-scale=1">
<link type="text/css" rel="stylesheet" href='<spring:url value="/resources/css/bootstrap.min.css" />' >
<link type="text/css" rel="stylesheet" href='<spring:url value="/resources/css/stylesvitalbeat.css" />' >
</head>
<body>
<div class="container-fluid">
<div class="row">
<form action="http://localhost:8080/LoginMavenSpringMVC/admin/create" method="post">
<div class="col-md-2 col-sm-3">
<label class="control-label">Create Category:</label></div>
<div class="col-md-2 col-sm-4">
<input type="text" class="form-control input-sm field_color" name="categoryName" placeholder="Name of the Category">
</div>
<div class="col-md-1 col-sm-3">
<input type="submit" class="btn btn-primary btn-sm height_margin" name="create" value="Create">
</div>
</form>
<div>
<form class="form-horizontal" action="http://localhost:8080/LoginMavenSpringMVC/admin/saveReferral" method="post">
<div class="row margin_div">
<div class="col-sm-3 col-md-2">
<label class="control-label">Select Category</label>
</div>
<div class="col-sm-5 col-md-4">
<f:select path="categoryOptions">
<f:options items="${list}"/>
</f:select>
</div>
</div>
</div>
控制器类
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
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.java.Dao.services.RegisterDao;
import com.java.Dao.services.RegisterDaoImplementaion;
@Controller
@RequestMapping("/admin")
public class ReferralController {
@Autowired
RegisterDao registerDao;
@RequestMapping(value="/create", method=RequestMethod.POST)
public ModelAndView create(@ModelAttribute("create") Category create){
ModelAndView model =new ModelAndView("referralPage");
System.out.println("Referral Controller.");
System.out.println( create.getCategoryName());
if((StringUtils.hasText(create.getId()))) {
registerDao.UpdateCategory(create);
} else {
registerDao.addCategory(create);
}
List<Category> list= registerDao.categoryList();
model.addObject("list", list);
return model;
}
@RequestMapping(value="/saveReferral", method=RequestMethod.POST)
public ModelAndView save(@ModelAttribute("saveReferral") Referrals referral){
ModelAndView model=new ModelAndView("referralPage");
return model;
}
}
道服务
dao class...
package com.java.Dao.services;
import java.util.List;
import com.java.Package.Login.Category;
public interface RegisterDao {
public void addCategory(Category createCategory);
public void UpdateCategory(Category createCategory);
public List<Category> categoryList();
}
道实现
import java.util.List;
import java.util.UUID;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.stereotype.Repository;
import com.java.Package.Login.Category;
import com.mongodb.DBCollection;
@Repository
public class RegisterDaoImplementaion implements RegisterDao {
@Autowired
private MongoTemplate mongoTemplate;
public static final String Collection_Category="CategoryList";
public void addCategory(Category createCategory) {
// TODO Auto-generated method stub
createCategory.setId(UUID.randomUUID().toString());
System.out.println("Object in Repos::"+createCategory);
mongoTemplate.insert(createCategory, Collection_Category);
}
public void UpdateCategory(Category createCategory) {
// TODO Auto-generated method stub
mongoTemplate.insert(createCategory, Collection_Category);
}
@Override
public List<Category> categoryList() {
return mongoTemplate.findAll(Category.class, Collection_Category);
}
}
类映射类别选项
public class Referrals {
private String categoryOptions;
public String getCategoryOptions() {
return categoryOptions;
}
public void setCategoryOptions(String categoryOptions) {
this.categoryOptions = categoryOptions;
}
}
我收到这个错误日志
Servlet.service() for servlet [spring-dispatcher] in context with path [/LoginMavenSpringMVC] threw exception [An exception occurred processing JSP page /WEB-INF/views/referralPage.jsp at line 366
363: </div>
364: <div class="col-sm-5 col-md-4">
365:
366: <f:select path="categoryOptions">
367: <f:options items="${list}"/>
368: </f:select>
369: <!-- <select class="form-control input-sm" name="categoryOptions" >
Stacktrace:] with root cause
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'categoryOptions' available as request attribute
我哪里出错了？我尝试过不同问题的解决方案，但无法解决。
