Question

我在弹簧控制器中有这样的方法

@RequestMapping(value = "/updateArticle", method = RequestMethod.POST)
@ResponseBody
public void updateArticle(Long id,  String name, String description) {
  ...
}

我想要id，并且名字是必需的。换句话说，如果它们是空值，则必须抛出异常。

我该怎么做？这个或类似的东西有没有注释？

由于

Answer 1

是的，有。 @RequestParam(required=true)请参阅docs。

默认情况下，必需标志为true，因此您需要做的只是：

@RequestMapping(value = "/updateArticle", method = RequestMethod.POST)
@ResponseBody
public void updateArticle(@RequestParam Long id, @RequestParam String name, @RequestParam String description) {
  ...
}

Answer 2

我假设您正在将表单传递给此控制器。因此，将所有表单字段转换为Form对象，然后您可以对它们使用Java验证。因此，例如，您在表单中包含id，name和description字段：

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class ArticleForm {

    @NotNull
    private Long id;

    @Size(min = 2, max = 20)
    private String name;

    @Size(min =2, max =20)
    private String description;

    // getters and setters
}

然后，在你的控制器中：

 @RequestMapping(value = "/updateArticle", method = RequestMethod.POST)
 @ResponseBody
 public void updateArticle(@Valid ArticleForm articleForm) {
      // do something with the article form object using getters and this retrieves
      // values sent in the HTTP Form
 }

Answer 3

您必须在控制器中添加带有所需true注释的RequestParam

@RequestMapping(value = "/updateArticle", method = RequestMethod.POST)
@ResponseBody
public void updateArticle(@RequestParam(value="id",required=true) long id,@RequestParam(value="name",required=true)  String name, @RequestParam(value="description",required=true) String description) {
  ...
}

当您从浏览器点击此控制器URL时，如果其中一个参数是任务，那么您将在浏览器上获得incorrect syntax error

Answer 4

@RequestMapping (value = "/gethomeworkinfo.json", method = {RequestMethod.GET, RequestMethod.POST}, produces = "application/json")
public @ResponseBody
HomeworkReport getHomeworkReportInfo(@RequestParam (value = "schoolid", required = false) String schoolId, @RequestParam (value = "homeworkid") String homeworkId,
        @RequestParam (value = "startdate", required = false, defaultValue = "2014-06-01") @DateTimeFormat (pattern = "yyyy-MM-dd") Date startdate,
        @RequestParam (value = "enddate", required = false, defaultValue = "2014-12-30") @DateTimeFormat (pattern = "yyyy-MM-dd") Date enddate,
        @RequestParam (value = "userid", required = false) String userId, HttpServletRequest request) {

    // some actions

}

我目前使用这种方法。它会对你有所帮助。

如何根据需要标记Spring MVC参数

4 个答案: