Spring Boot跨类访问实例变量及Postman请求体示例

Hey there! Let's work through your two requirements one by one, and first fix a small syntax issue in your Material class definition to avoid compilation errors.

First: Fix the Map Declaration in Material Class #

I noticed a typo in your Map definition: Map<warehouseCode, Quantity> warehouse; won't work because warehouseCode isn't a valid Java type. Since the warehouseCode from your Warehouse class is a String, update the line to:

private Map<String, Quantity> warehouse;

This correctly maps each warehouse code (String value) to its corresponding Quantity.

1. Accessing WarehouseCode from Material's Map #

With the Map properly defined, you can access warehouse codes (they're the keys of the Map) in your service or controller logic. Here's a practical example of how to iterate through all warehouse codes and their associated stock quantities:

Example in MaterialService #

public void processMaterialWarehouseData(Material material) {
    // Fetch all warehouse codes from the Map's key set
    Set<String> warehouseCodes = material.getWarehouse().keySet();
    
    for (String code : warehouseCodes) {
        Quantity stockQuantity = material.getWarehouse().get(code);
        // Perform your desired operations with the warehouse code and quantity
        System.out.printf("Warehouse Code: %s | Available Stock: %d%n", code, stockQuantity.getQuantity());
    }
}

If you need to target a specific warehouse code directly, use material.getWarehouse().get("WH001") (replace "WH001" with your target code).

2. Postman POST Request Body Example #

Below is a complete JSON request body you can use in Postman for your /material endpoint. It aligns with your Material class structure and includes the warehouse Map with multiple warehouse entries:

{
  "materialId": "MAT-0001",
  "materialGroup": "Electronics",
  "materialCode": "LAPTOP-PRO",
  "materialType": "Consumer Goods",
  "materialDimension": "35x25x2cm",
  "materialDescription": "15-inch Pro Laptop with 16GB RAM",
  "status": "ACTIVE",
  "materials": [], // Leave empty if no child materials, or remove the field entirely
  "warehouse": {
    "WH-NY-001": {
      "quantity": 120
    },
    "WH-LA-002": {
      "quantity": 85
    },
    "WH-TX-003": {
      "quantity": 50
    }
  }
}

Quick Notes for the Request Body: #

• creationDate and updateDate: These fields are initialized with LocalDate.now() in your class, so you don't need to include them in the request—your backend will auto-set their values.
• materials List: If you don't need to include child Material instances, you can either leave it as an empty array or omit the field from the JSON entirely.
• Warehouse Entries: Add/remove key-value pairs in the warehouse object as needed, where each key is your warehouse code (string) and the value is a Quantity object with the quantity field.

内容的提问来源于stack exchange，提问作者briancoder