映射中数组列表中的java设置值

Question

我正在从elasticsearch获取记录，并试图以列表的形式返回。但是我从sourceAsMap添加到列表时出错

请在下面找到我的代码

SearchHit[] searchHits = searchResponse.getHits().getHits();
    List<Product> productList=new ArrayList<Product>();
    for (SearchHit hit : searchHits) {
        // get each hit as a Map

        Map<String, Object> sourceAsMap = hit.getSourceAsMap();
        product=new Product();
        product.setName(sourceAsMap.get("name").toString());
        productList.add(product.setName(sourceAsMap.get("name").toString()));  // throwing error in this line

    }

    return productList;
}   

请找到我的POJO课程：

@JsonInclude(JsonInclude.Include.NON_EMPTY)
public class Product {

    private String id;
    private String name;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

Answer 1

我相信你得到了The method add(void) is undefined for the type Product。你的Product#setName方法返回类型是void，所以你实际上是在尝试将void添加到Product的List。你应该做productList.add(product)而不是productList.add(product.setName(sourceAsMap.get("name").toString()));

您的代码应该如下所示：

    Map<String, Object> sourceAsMap = hit.getSourceAsMap();
    product=new Product();
    product.setName(sourceAsMap.get("name").toString());
    productList.add(product);