Spring MVC：将表单输入映射到包含 HashMap 的复杂支持对象

Question

我有一个场景，其中来自 jsp 表单的输入字段列表将映射到支持对象 Resolution 中的 HashMap 字段。

    @Controller
    @RequestMapping("/rms") 
    class ResolutionManagementController{

        private static final String ISSUE_FORM_PATH="/view/resolutionForm";
        private static final String SHOW_RESOLUTION_PATH="/view/showResolution";

        @Autowired
        IIssueManagementService issueService;

        @Autowired
        ResolutionManagementService resolutionService;

        @RequestMapping(value="/resolution/form",method=RequestMethod.GET)
        String resolutionForm(Model model){
                List<Issue> issues = issueService.listIssue();
                model.addAttribute("issues",issues);
                model.addAttribute("resolution", new Resolution());
                return ISSUE_FORM_PATH;     
        }

        @RequestMapping(value="/resolution",method=RequestMethod.POST)
        String resolve(Resolution resolution,Model model){
            List<SupportExecutive> executives = resolutionService.addResolution(resolution);
            model.addAttribute("executives",executives);
            return SHOW_RESOLUTION_PATH;
        }   

    }

支持表单对象

class Resolution{
        private String resolutionId;
        private String categoryId;
        private Map<Issue,SupportExecutive> allotments;

        //getters and setters

    } 

resolutionForm.jsp

<form:form action="/rms/resolution" commandName="resolution">

        <c:forEach var="issue" items="${issues}">
            <tr>
                <td>
                    ${issue.issueTitle}
                </td>
                <td>
<!-- What should i do so that issueTitle is converted
to Issue Object and stored as map key in allotments Map in resolution 
object and the value entered by the user is converted to SupportExecutive 
object and stored as corresponding value object of the allotments map-->
                    <input type="text" name="${issue.issueTitle}>"
                </td>
            </tr>
        </c:forEach>


    </form:form>

我试图查看属性编辑器，但我无法理解如何使用属性编辑器获取键和值并存储在地图中。或者他们可能不适合这里。

实现这一目标的最干净的方法是什么？如果能提供涉及步骤的详细说明就好了。

Answer 1

这里概述了为您的域类连接属性编辑器的一种方法：

package your.controller.package;

import org.springframework.web.bind.annotation.InitBinder;
import java.beans.PropertyEditorSupport;
...
public class YourController {
    ...
    @InitBinder
    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) {
        binder.registerCustomEditor(Resolution.class, new ResolutionFormEditor());
    }

    private static class ResolutionFormEditor extends PropertyEditorSupport {
        // convert a Resolution object to a string type
        @Override public String getAsText() {
            Resolution r = (Resolution) this.getValue();
            return r != null ? r.resolutionId() : "";
        }  

        // convert string representation to Resolution object
        @Override public void setAsText(String text) {
            Resolution r = resolutionService.findById(text);
            this.setValue(r);
        }
    }
    ...
} 

Spring property editor documentation 有很好的描述。

编辑：

抱歉，我忘记了您问题的地图部分。看一下this forum post的例子代码。