请教这个vaadin10demo的持久化问题,源码里的假数据采用静态的方式,被业务类调用,然后我想使用springdatajpa+herbernate的方式对数据进行持久化,发现很难初始化时注入数据,因为交给spring管理的对象依赖注入时,不能是静态的,这该怎么处理?
你是指在app启动时存入一些初始数据吗？
** Zhang ZhiKe:**
你是指在app启动时存入一些初始数据吗？
你好,是的,Demo里本来是假数据,我改成存储在mysql中,那么app启动时渲染界面肯定需要从数据库查询传入数据,v10初始化界面都是空参构造,我怎么传入数据呢
应该是在WEB容器启动后，你的应用被浏览器打开之前就要完成存储初始数据吧。
注册一个VaadinServiceInitListenner，实现serviceInit，在那里就可以存储你的初始数据了。
你反正用的是Spring Data JPA，那就用可以用JpaRepository存数据，还不用写SQL，连Session都不用取。
要是你用的是Spring Boot，你就写一个InitialBean,在bean里完成初始数据的持久化。
** Zhang ZhiKe:**
应该是在WEB容器启动后，你的应用被浏览器打开之前就要完成存储初始数据吧。
注册一个VaadinServiceInitListenner，实现serviceInit，在那里就可以存储你的初始数据了。
你反正用的是Spring Data JPA，那就用可以用JpaRepository存数据，还不用写SQL，连Session都不用取。要是你用的是Spring Boot，你就写一个InitialBean,在bean里完成初始数据的持久化。
应该是照老兄指导的这思路来传入数据,我试了一下,还是没传成功,是不是注册的方式不对,我就在原来的基础上implement VaadinServiceInitListenner,
然后重写了init方法,还缺哪一步,希望指导一下
@Route(value = "categories", layout = MainLayout.class)
@PageTitle("Categories List")
public class CategoriesList extends VerticalLayout implements VaadinServiceInitListener {
@Autowired
private CategoryService categoryService;
@Autowired
private ReviewService reviewService;
private final TextField searchField = new TextField("", "Search categories");
private final H2 header = new H2("Categories");
private final Grid<Category> grid = new Grid<>();
private CategoryEditorDialog form;
public CategoriesList() {
}
@Override
public void serviceInit(ServiceInitEvent event) {
form = new CategoryEditorDialog(
this::saveCategory, this::deleteCategory, this.categoryService, reviewService);
initView();
addSearchBar();
addContent();
updateView(categoryService);
}
Bill Li:
** Zhang ZhiKe:**
应该是在WEB容器启动后，你的应用被浏览器打开之前就要完成存储初始数据吧。
注册一个VaadinServiceInitListenner，实现serviceInit，在那里就可以存储你的初始数据了。
你反正用的是Spring Data JPA，那就用可以用JpaRepository存数据，还不用写SQL，连Session都不用取。要是你用的是Spring Boot，你就写一个InitialBean,在bean里完成初始数据的持久化。
应该是照老兄指导的这思路来传入数据,我试了一下,还是没传成功,是不是注册的方式不对,我就在原来的基础上implement VaadinServiceInitListenner,
然后重写了init方法,还缺哪一步,希望指导一下@Route(value = "categories", layout = MainLayout.class) @PageTitle("Categories List") public class CategoriesList extends VerticalLayout implements VaadinServiceInitListener { @Autowired private CategoryService categoryService; @Autowired private ReviewService reviewService; private final TextField searchField = new TextField("", "Search categories"); private final H2 header = new H2("Categories"); private final Grid<Category> grid = new Grid<>(); private CategoryEditorDialog form; public CategoriesList() { } @Override public void serviceInit(ServiceInitEvent event) { form = new CategoryEditorDialog( this::saveCategory, this::deleteCategory, this.categoryService, reviewService); initView(); addSearchBar(); addContent(); updateView(categoryService); }
这个是导航类,是不是需要在这边发布事件
@HtmlImport("frontend://styles/shared-styles.html")
@Viewport("width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes")
//@Component("mainLayout")
public class MainLayout extends Div
implements RouterLayout, PageConfigurator {
public MainLayout() {
H2 title = new H2("Beverage Buddy");
title.addClassName("main-layout__title");
RouterLink reviews = new RouterLink(null, ReviewsList.class);
reviews.add(new Icon(VaadinIcon.LIST), new Text("Reviews"));
reviews.addClassName("main-layout__nav-item");
// Only show as active for the exact URL, but not for sub paths
reviews.setHighlightCondition(HighlightConditions.sameLocation());
RouterLink categories = new RouterLink(null, CategoriesList.class);
categories.add(new Icon(VaadinIcon.ARCHIVES), new Text("Categories"));
categories.addClassName("main-layout__nav-item");
Div navigation = new Div(reviews, categories);
navigation.addClassName("main-layout__nav");
Div header = new Div(title, navigation);
header.addClassName("main-layout__header");
add(header);
addClassName("main-layout");
}
@Override
public void configurePage(InitialPageSettings settings) {
settings.addMetaTag("apple-mobile-web-app-capable", "yes");
settings.addMetaTag("apple-mobile-web-app-status-bar-style", "black");
}
}
还不是VaadinServiceInitService，是这个：
https://vaadin.com/docs/v13/flow/advanced/tutorial-flow-runtime-configuration.html
@WebServlet(
urlPatterns = "/*",
initParams = {
@WebInitParam(name = "frontend.url.es6", value = "http://mydomain.com/es6/"),
@WebInitParam(name = "frontend.url.es5", value = "http://mydomain.com/es5/") }
)
@VaadinServletConfiguration(productionMode = false)
public class MyInitServlet extends VaadinServlet {
@Override
protected void servletInitialized() throws ServletException {
super.servletInitialized();
System.out.println("Do Some Thing");
}
}
Do Some Thing你就开始存数据了。。。
@WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
@VaadinServletConfiguration(ui = MainUI.class, productionMode = false)
public static class MyUIServlet extends VaadinServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
}
一般vaadin的MainUI都要extends VaadinServlet ，这个Demo里的mainlayout怎么没继承，也能打开界面啊
** Zhang ZhiKe:**
还不是VaadinServiceInitService，是这个：
https://vaadin.com/docs/v13/flow/advanced/tutorial-flow-runtime-configuration.html@WebServlet( urlPatterns = "/*", initParams = { @WebInitParam(name = "frontend.url.es6", value = "http://mydomain.com/es6/"), @WebInitParam(name = "frontend.url.es5", value = "http://mydomain.com/es5/") } ) @VaadinServletConfiguration(productionMode = false) public class MyInitServlet extends VaadinServlet { @Override protected void servletInitialized() throws ServletException { super.servletInitialized(); System.out.println("Do Some Thing"); } }Do Some Thing你就开始存数据了。。。
老兄,我发现了更简单的方法,在视图入口类直接带参注入,就能在app一启动的时候传入数据了,下面是代码
@HtmlImport("frontend://styles/shared-styles.html")
@Viewport("width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes")
public class MainLayout extends Div
implements RouterLayout, PageConfigurator {
public MainLayout(@Autowired CategoryService categoryService, @Autowired ReviewService reviewService) {
H2 title = new H2("Beverage Buddy");
title.addClassName("main-layout__title");
RouterLink reviews = new RouterLink(null, ReviewsList.class);
reviews.add(new Icon(VaadinIcon.LIST), new Text("Reviews"));
reviews.addClassName("main-layout__nav-item");
// Only show as active for the exact URL, but not for sub paths
reviews.setHighlightCondition(HighlightConditions.sameLocation());
RouterLink categories = new RouterLink(null, CategoriesList.class);
categories.add(new Icon(VaadinIcon.ARCHIVES), new Text("Categories"));
categories.addClassName("main-layout__nav-item");
Div navigation = new Div(reviews, categories);
navigation.addClassName("main-layout__nav");
Div header = new Div(title, navigation);
header.addClassName("main-layout__header");
add(header);
addClassName("main-layout");
}
@Route(value = "categories", layout = MainLayout.class)
@PageTitle("Categories List")
@UIScope
public class CategoriesList extends VerticalLayout {
private CategoryService categoryService;
private ReviewService reviewService;
private final TextField searchField = new TextField("", "Search categories");
private final H2 header = new H2("Categories");
private final Grid<Category> grid = new Grid<>();
private CategoryEditorDialog form;
public CategoriesList(@Autowired CategoryService categoryService,@Autowired ReviewService reviewService) {
this.categoryService = categoryService;
this.reviewService = reviewService;
form = new CategoryEditorDialog("category",
this::saveCategory, this::deleteCategory,this.categoryService);
initView();
addSearchBar();
addContent();
updateView(categoryService);
}
private void initView() {
addClassName("categories-list");
setDefaultHorizontalComponentAlignment(Alignment.STRETCH);
}
Bill Li:
** Zhang ZhiKe:**
还不是VaadinServiceInitService，是这个：
https://vaadin.com/docs/v13/flow/advanced/tutorial-flow-runtime-configuration.html@WebServlet( urlPatterns = "/*", initParams = { @WebInitParam(name = "frontend.url.es6", value = "http://mydomain.com/es6/"), @WebInitParam(name = "frontend.url.es5", value = "http://mydomain.com/es5/") } ) @VaadinServletConfiguration(productionMode = false) public class MyInitServlet extends VaadinServlet { @Override protected void servletInitialized() throws ServletException { super.servletInitialized(); System.out.println("Do Some Thing"); } }Do Some Thing你就开始存数据了。。。
老兄,我发现了更简单的方法,在视图入口类直接带参注入,就能在app一启动的时候传入数据了,下面是代码
@HtmlImport("frontend://styles/shared-styles.html") @Viewport("width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes") public class MainLayout extends Div implements RouterLayout, PageConfigurator { public MainLayout(@Autowired CategoryService categoryService, @Autowired ReviewService reviewService) { H2 title = new H2("Beverage Buddy"); title.addClassName("main-layout__title"); RouterLink reviews = new RouterLink(null, ReviewsList.class); reviews.add(new Icon(VaadinIcon.LIST), new Text("Reviews")); reviews.addClassName("main-layout__nav-item"); // Only show as active for the exact URL, but not for sub paths reviews.setHighlightCondition(HighlightConditions.sameLocation()); RouterLink categories = new RouterLink(null, CategoriesList.class); categories.add(new Icon(VaadinIcon.ARCHIVES), new Text("Categories")); categories.addClassName("main-layout__nav-item"); Div navigation = new Div(reviews, categories); navigation.addClassName("main-layout__nav"); Div header = new Div(title, navigation); header.addClassName("main-layout__header"); add(header); addClassName("main-layout"); } @Route(value = "categories", layout = MainLayout.class) @PageTitle("Categories List") @UIScope public class CategoriesList extends VerticalLayout { private CategoryService categoryService; private ReviewService reviewService; private final TextField searchField = new TextField("", "Search categories"); private final H2 header = new H2("Categories"); private final Grid<Category> grid = new Grid<>(); private CategoryEditorDialog form; public CategoriesList(@Autowired CategoryService categoryService,@Autowired ReviewService reviewService) { this.categoryService = categoryService; this.reviewService = reviewService; form = new CategoryEditorDialog("category", this::saveCategory, this::deleteCategory,this.categoryService); initView(); addSearchBar(); addContent(); updateView(categoryService); } private void initView() { addClassName("categories-list"); setDefaultHorizontalComponentAlignment(Alignment.STRETCH); }
666
不过初始化数据的存放，我个人比较喜欢在容器启动时在相关的地方进行
注册一个VaadinServiceInitListenner，实现serviceInit，在那里就可以存储你的初始数据了。 你反正用的是Spring Data JPA，那就用可以用JpaRepository存数据，还不用写SQL，连Session都不用取。
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