Spring boot 接收数组

谁践踏了优雅 2022-04-18 00:59 213阅读 0赞

### 记录后台接收数组 ###

如果所有参数（包括数组）全部用一个实体类来接收，则不需要考虑前端数组的`传参格式`，他都能解析并封装到实体类里面。  
这里的`传参格式`指：  
后台用一个数组a来接收：

Integer[] a;

前端传值是下面两种的其中一种，都是可以的：  
`a=1&a=2&a=3` 或者 `a[0]=1&a[1]=2&a[3]=3`

--------------------

但是，如果直接在controller用数组对象接收的数组。而不是使用实体类来接收数组。那么 需要考虑以下两种情况。

#### 1.前端使用ajax传的数组，并且格式是这样的： ####

http://192.168.0.143:8091/tourist/goods/a_goods?specValues[]=1&specValues[]=3&specImgs[]=1&specNames[]=1&specNames[]=3

那么，你需要@RequestParam(value = “specValues\[\]”)。

Controller: (`参数前面加上注解 @RequestParam(value = "specValues[]") String[] specValues"`)

/** * 添加商品 */
        @ApiOperation(value = "新增商品", notes = "卖家新增商品")
        @ApiImplicitParams({ 
                @ApiImplicitParam(name = "userId", value = "卖家用户ID", required = false, dataType = "int", paramType = "query"),
                @ApiImplicitParam(name = "access_token", value = "access_token", required = false, dataType = "String", paramType = "query")
        })
        @RequestMapping(value = "a_goods", method = RequestMethod.POST)
        public HttpEntity addGoods(FlkGoods goods, Integer userId, @RequestParam(value = "specValues[]") String[] specValues, @RequestParam(value = "specImgs[]") String[] specImgs, @RequestParam(value = "specNames[]") String[] specNames, HttpServletRequest request){ 
            if (specNames == null || specImgs == null || specValues == null) { 
                logger.info("商品规格相关数据未传入");
                throw new BusiException(ErrorKey.INVALID_REQUEST, "请完善商品规格！");
            }
            Map<String, Object> returnMap = goodsService.addGoods(goods, userId, specValues, specImgs, specNames);
            return new ResponseEntity<>(returnMap, HttpStatus.OK);
        }

前端传的参数是这样的：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIyNjM4Mzk5_size_16_color_FFFFFF_t_70]

#### 2.前端使用ajax传的数组，表单序列化，并且格式是这样的： ####

Controller: (参数前面去掉@RequestParam注解)

/** * 添加商品 */
        @ApiOperation(value = "新增商品", notes = "卖家新增商品")
        @ApiImplicitParams({ 
                @ApiImplicitParam(name = "userId", value = "卖家用户ID", required = false, dataType = "int", paramType = "query"),
                @ApiImplicitParam(name = "access_token", value = "access_token", required = false, dataType = "String", paramType = "query")
        })
        @RequestMapping(value = "a_goods", method = RequestMethod.POST)
        public HttpEntity addGoods(FlkGoods goods, Integer userId, String[] specValues, String[] specImgs, String[] specNames, HttpServletRequest request){ 
            if (specNames == null || specImgs == null || specValues == null) { 
                logger.info("商品规格相关数据未传入");
                throw new BusiException(ErrorKey.INVALID_REQUEST, "请完善商品规格！");
            }
            Map<String, Object> returnMap = goodsService.addGoods(goods, userId, specValues, specImgs, specNames);
            return new ResponseEntity<>(returnMap, HttpStatus.OK);
        }

http://localhost:8091/tourist/goods/a_goods?goodsName=asfasdf&specValues=11ml%2C12ml%2C13ml&specValues=%E5%A4%A7%2C%E5%B0%8F&specImgs=2.jpg&specNames=%E9%A2%9C%E8%89%B2&specNames=%E5%B0%BA%E7%A0%81

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIyNjM4Mzk5_size_16_color_FFFFFF_t_70 1]

最后测试发现，使用方式1，通过swagger发送的参数，可以接收到。但是前端用post方式传过来，还是接收不到。查资料查了半天，仍然不知道原因，有知道的朋友，烦请告知我一下。。。万分感激！

--------------------

### 结论 ###

最后，我都用的实体类接收数据。

spring boot 接收参数，如果参数多，且包含了数组，建议直接用一个实体类接收。  
RequestGoodsH5.java:

@Data
    public class RequestGoodsH5 extends FlkGoods{ 
    
        private Integer userId;
    
        @ApiModelProperty(value = "规格值名称组合")
        private String[] specValues;
    
        @ApiModelProperty(value = "规格图片组合")
        private String[] specImgs;
    
        @ApiModelProperty(value = "规格名称组合")
        private String[] specNames;
        
        /** * 其他更多参数 */
    }

controller:

/** * 添加商品 */
        @ApiOperation(value = "新增商品", notes = "卖家新增商品")
        @ApiImplicitParams({ 
                @ApiImplicitParam(name = "userId", value = "卖家用户ID", required = false, dataType = "int", paramType = "query"),
                @ApiImplicitParam(name = "access_token", value = "access_token", required = false, dataType = "String", paramType = "query")
        })
        @RequestMapping(value = "a_goods", method = RequestMethod.POST)
        public HttpEntity addGoods(RequestGoodsH5 goods){ 
            if (goods.getSpecValues() == null || goods.getSpecImgs() == null || goods.getSpecNames() == null) { 
                logger.info("商品规格相关数据未传入");
                throw new BusiException(ErrorKey.INVALID_REQUEST, "请完善商品规格！");
            }
            FlkGoods goodsReal = new FlkGoods();
            BeanUtil.copyPropertiesIgnoreNullValue(goods, goodsReal);
            Map<String, Object> returnMap = goodsService.addGoods(goodsReal, goods.getUserId(), goods.getSpecValues(), goods.getSpecImgs(), goods.getSpecNames());
            return new ResponseEntity<>(returnMap, HttpStatus.OK);
        }

通过一个实体类来接收，前端数组传这两种形式（`a=1&a=2&a=3` 或者 `a[0]=1&a[1]=2&a[3]=3`），spring boot 都可以把前端传过来的值封装到对应的参数里面。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIyNjM4Mzk5_size_16_color_FFFFFF_t_70 1]: /images/20220418/3f222d146f71497082d831b3592ab3ad.png