在Spring boot Java的表单中使用另一个包中的模型

Question

在我的builds.html页面中，我有以下表格：

<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在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模型在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;
    }
 }

所以我得到了以下错误：

[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?

既然Build在另一个包中，我如何在表单中使用build模型

Answer 1

在GET方法中添加属性时，应该使用build而不是builds，因为在这里使用buildth:object="${build}"，所以Spring找不到它

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

这个文件可能会有所帮助