小编Pet*_*r T的帖子

我尝试测试 Hibernate 的一对多关系。我定义 Post 和 PostComment 实体如下： Post.java

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name = "post")
public class Post {

    @Id
    @Column(name="post_id")
    @GeneratedValue(strategy= GenerationType.IDENTITY)
    private Long postId;

    @Column(name="title")
    private String title;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "post",
            orphanRemoval = true)
    private List<PostComment> comments = new ArrayList<>();

    public Post() {};

    public Post(String title) {
        this.title = title;
    }
   // Add getter and setter
}

发表评论.java

    import javax.persistence.*;

@Entity
@Table(name = "post_comment")
public class PostComment {
    @Id
    @Column(name="comment_id")
    @GeneratedValue(strategy= GenerationType.IDENTITY) …

每当我运行由angularjs 1.4.3实现的应用程序时。

BannerService.js

app.service('BannerService',function ($http) {

    this.save = function saveBanner(banner) {
        return $http({
              method: 'POST',
                url: 'http://localhost:8081/api/banners'
            });
    }

});

BannerController.js

app.controller('BannerAddCtrl', ['$scope','$log','BannerService',
    function ($scope,$log, BannerService) {
        $scope.save = function() {
            BannerService.saveBanner(myBanner)
                .success(function (result) {
                    $log.debug('RESULT', result);
                }, function (reason) {
                    $log.debug('REASON', reason);
                });
        }

}]）;

还有index.html

 <div class="modal-footer">
    <button type="button" class="btn btn-primary btn-block" ng-click="save()">Save Banner</button>

  </div>

它引发如下异常：

TypeError: BannerService.saveBanner is not a function
at ChildScope.$scope.save (bannerControllers.js:64)
at fn (eval at compile (angular.js:13145), <anonymous>:4:203)
at callback (angular.js:23298)
at ChildScope.$eval (angular.js:15846) …

我用以下代码解析datetime:

String parseDate(String tranDateTime, String originalDateFormat, String toDateFormat) throws ParseException {
    SimpleDateFormat originalMonthYear = new SimpleDateFormat(originalDateFormat);
    Date date = originalMonthYear.parse(tranDateTime);

    SimpleDateFormat formatter = new SimpleDateFormat(toDateFormat);
    return formatter.format(date);
}

并尝试解析日期时间值,如下所示:

parseDate("2017-08-16T00:00:00Z", 
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXX", "yyyy-MM-dd HH:mm:ss");

抛出异常:

java.text.ParseException:无法解析的日期:"2017-08-16T00:00:00Z"

但是,当我更改日期值时"2017-08-16T02:54:15.537Z",功能正常.我不知道为什么.