spring - 如何传递数据春季MVC

Question

我想和你分享我的问题。

我在 jsp 页面上构建并在我的页面上使用其中一些<form:select>用于<form:select>在我请求页面时从 DB 中提取和呈现数据，search.jsp并且用户必须选择一个：

<form action="result" method="get" >

    <table>

    <tr>
    <th>Date fro DB:</th>
    <td><form:select  path="listOfDates">
    <form:option value="NONE"> --SELECT--</form:option>
    <form:options items="${listOfDates}"></form:options>
    </form:select>
    </td>
    </tr>

    <tr>
    <th>Name of company from DB:</th>
    <td><form:select  path="listOfInstitutionsNames">
    <form:option value="NONE"> --SELECT--</form:option>
    <form:options items="${listOfInstitutionsNames}"></form:options>
    </form:select>
    </td>
    </tr>

    <tr>
    <th>Type of company from DB:</th>
    <td>
    <form:select  path="listOfInstitutionsTypes">
    <form:option value="NONE"> --SELECT--</form:option>
    <form:options items="${listOfInstitutionsTypes}"></form:options>
    </form:select>
    </td>
    </tr>

    <tr>
    <td><input type="submit" value="Извлечь"/></td>
    </tr>

    </table>

    </form>

我需要将用户选择的请求参数传递给我的控制器，这是控制器的代码：

@Controller
public class HomeController{


    @Autowired
    private ControllerSupportClass controllerSupportClass; 


        @RequestMapping(value="/search", method=RequestMethod.GET)
        public String search(Model model) {

            List<Date> listOfDates = controllerSupportClass.findAllDatesForm();
            List<String> listOfInstitutionsNames = controllerSupportClass.findAllInstitutionsForm();
            List<String> listOfInstitutionsTypes = controllerSupportClass.findAllTypesForm();
            model.addAttribute("listOfInstitutionsTypes", listOfInstitutionsTypes);
            model.addAttribute("listOfInstitutionsNames", listOfInstitutionsNames);
            model.addAttribute("listOfDates", listOfDates);

            return "search";

        }


        @RequestMapping(value ="/result", method=RequestMethod.GET)
        public String SecondActionPage(@RequestParam String particularDate, 
                                       @RequestParam String nameOfInstitution, 
                                       @RequestParam String typeName,
                                       Model model) throws Exception {


                if(particularDate !="" && nameOfInstitution.trim() !="" && typeName.trim()=="") {                   
                    controllerSupportClass.findWithDateAndName(nameOfInstitution, particularDate, model);                   
                } else if(particularDate.trim() !="" && nameOfInstitution.trim() =="" && typeName.trim() !="") {                    
                    controllerSupportClass.findWithAddedDateAndType(typeName, particularDate, model);                   
                } else if(particularDate.trim() !="" && nameOfInstitution.trim() =="" && typeName.trim() ==""){         
                    controllerSupportClass.findWithAddedDate(particularDate, model);    
                } else if(particularDate.trim() !="" && nameOfInstitution.trim() !="" && typeName.trim() !="") {
                    throw new Exception("Search by choose all parameters is not exceptable");   
                } else {    
                    throw new Exception("You didn't put any search parameters");    
                }           
            return "search";
        }


}

如您所见，我的SecondActionPage()方法使用@RequestParam注释从 url 获取参数并在验证它们并将它们传递给另一个方法以提取与请求参数对应的数据......但问题是我无法传递它们。它只是向我展示这样http://localhost:8080/controller/result?和之后？什么都没有过去。serach.jsp我怎样才能从谢谢中传递我所有选择的参数。

Answer 1

我相信你应该<form:select>在里面使用<form:form>.

它应该如下所示：

搜索.jsp：

<form:form modelAttribute="myform" action="result" method="get" >
  <form:select  path="nameOfInstitution">
    <form:option value="NONE"> --SELECT--</form:option>
    <form:options items="${listOfInstitutionsNames}"></form:options>
  </form:select>
  ...
</form:form>

HomeController.java：

@RequestMapping(value = "/search", method = RequestMethod.GET)
public String search(Model model) {
  ...
  model.addAttribute("myform", new MyForm());
  return "search";
}

@RequestMapping(value = "/result", method = RequestMethod.GET)
public String SecondActionPage(@RequestParam String nameOfInstitution,
    Model model,
    @ModelAttribute("myform") MyForm myform)
    throws Exception {
  ...
}

MyForm.java：

public class MyForm {
  private String nameOfInstitution;

  public String getNameOfInstitution() {
    return nameOfInstitution;
  }

  public void setNameOfInstitution(String nameOfInstitution) {
    this.nameOfInstitution = nameOfInstitution;
  }
}

希望这可以帮助。