Spring boot POST/GET请求的参数校验

Spring boot POST/GET请求的参数校验

SpringBoot提供的获取参数注解包括：@PathVariable，@RequestParam，@RequestBody
三者的区别：

1.

@PathVariable是spring3.0的一个新功能：接收请求路径中占位符的值

2.

@RequestParam

@RequestMapping(value = "/test", method = RequestMethod.GET)
    public Msg recommend(@RequestParam String uid,
                         @RequestParam String devId,
                         @RequestParam Integer channel,
                         @RequestParam(value="size",required = false, defaultValue = "5") Integer size,
                         @RequestParam(value="miniPrice",required = false, defaultValue = "0.0") Float miniPrice,
                         @RequestParam(value="highPrice",required = false, defaultValue = "0.0") Float highPrice,
                         @RequestParam(value="miniDiscount",required = false, defaultValue = "0.0") Float miniDiscount,
                         @RequestParam(value="highDiscount",required = false, defaultValue = "1.0") Float highDiscount,
                         @RequestParam(value="logId",required = false, defaultValue = "12345") String logId) {

其中，required = false表示该字段允许不传值，defaultValue表示不传值时的默认值

3.

@RequestBody
对于这种参数获取，可以使用@Valid注解进行参数校验
controller:

@RequestMapping(value = "/test", method = RequestMethod.POST)
    public Msg saveEmp(@RequestBody @Valid Goods goods, BindingResult result) {
        if (result.hasErrors()) {
//            校验失败，在模态框中显示校验失败的错误信息

            Map<String, Object> map = new HashMap<>();
            List<FieldError> errors = result.getFieldErrors();
            for (FieldError fieldError : errors) {
                System.out.println("错误的字段名：" + fieldError.getField());
                System.out.println("错误信息：" + fieldError.getDefaultMessage());
                map.put(fieldError.getField(), fieldError.getDefaultMessage());
            }
//            把错误信息返回给浏览器
            return Msg.fail().add("errorField", map);
        } else {
//            校验成功
//            employeeService.saveEmp(employee);
            return Msg.success();
        }

Msg类：

public class Msg {

    //    状态码，100成功，200失败
    private int code;
    //    提示信息
    private String msg;
    //    用户要返回给浏览器的数据
    private Map<String, Object> extend = new HashMap<String, Object>();

    public static Msg success(){
        Msg res = new Msg();
        res.setCode(200);
        res.setMsg("处理成功!");
        return res;
    }

    public static Msg fail(){
        Msg res = new Msg();
        res.setCode(201);
        res.setMsg("处理失败!");
        return res;
    }

    public Msg add(String key, Object value){
        this.getExtend().put(key, value);//链式调用设计模式
        return this;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Map<String, Object> getExtend() {
        return extend;
    }

    public void setExtend(Map<String, Object> extend) {
        this.extend = extend;
    }
}

pojo:

controller可以直接copy，实体类根据自己业务做修改，这里只是一个简单案例，还有其它用法如下：