java - 在 Spring boot 中的表单中使用另一个包中的模型 - Java

Question

在我的 builds.html 页面中，我有以下形式:

<div id="deployment">
   <form action="#" th:action="@{/builds}" th:object="${build}" method="post">
      <textarea rows="20" cols="150" th:field="*{configuration}">
      </textarea>
      <br></br>
     <button class="btn btn-primary btn-cons" type="submit">Deploy</button>
   </form>
</div>

我的BuildsControler.java位于deployments包中:

import builds.Build;

@Controller
@ComponentScan("builds")
public class BuildsController {

// @Autowired
// private BuildsRepository buildsRepository;
private final static Logger logger = Logger.getLogger(BuildsController.class);

/*
 * Add the builds url page
 */
@GetMapping("/builds")
public String index(Model model) {
    model.addAttribute("builds", new Build());
    return "builds";
}

/**
 * 
 * @param object
 * @return
 */
@PostMapping("/builds")
public Build deploy(@ModelAttribute Build build) {
    logger.info(String.format("--------- Deploying build: %s --------", build));
    return build;
}

}

当Build模型位于builds包中时:

@Document(collection = "builds")
public class Build {

    @Id
    @JsonSerialize(using = ToStringSerializer.class)
    private String id;
    private String date;

    @NotNull
    private String configuration;

    public Build() {
    }

    public Build(String configuration) {
        this.id = new ObjectId().toHexString();
        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        this.date = dateFormat.format(new Date());
        this.configuration = configuration;
    }
 }

所以我收到以下错误:

[THYMELEAF][http-nio-8080-exec-1] Exception processing template "builds": Exception evaluating SpringEL expression: "builds.build" (builds:514)
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "builds.build" (builds:514)] with root cause
org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 7): Property or field 'build' cannot be found on object of type 'builds.Build' - maybe not public?

由于 Build 在另一个包中，因此如何在表单中使用 build 模型？

Answer 1

您应该使用build不是builds ，在 GET 方法中添加属性时，因为您使用 build在这里th:object="${build}" ，所以 Spring 找不到它。

model.addAttribute("build", new Build());

此文档 example可能有帮助。