Spring MVC 接口参数处理、入参、校检 -记录

目的： 各情况类型的接口入参接收处理

• 入参规范很重要，特别是参数一多

PATH 类型参数：

• 数据详情
• http://localhost:8083/one/1

    @GetMapping("/one/{id}")
    public String one(@PathVariable String id){
        return "id:"+id;
    }

• 数据详情
• http://localhost:8083/param/oneDel/1,2,3,4,5

	@DeleteMapping("/oneDel/{id}")
    public String oneDel(@PathVariable String[] id){ //or  List<String> id
        return "id:"+ Arrays.toString(id);
    }

QUERY 类型参数：

• 数据详情
• http://localhost:8083/param/tow?id=1

	@GetMapping("/tow")
    public String tow(String id){
        return "id:"+id;
    }

QUERY 类型参数：

• 数据详情
• http://localhost:8083/param/three?name=小树&age=18&sex=1

	@GetMapping("/three")
    public String three(@RequestParam Map<String,Object> param){
        return "param:"+param;
    }

	@GetMapping("/four")
    public String four(User user){
        return "user:"+user;
    }

BODY 类型参数：

• 数据详情
• http://localhost:8083/param/five

{
    "name":"小树",
    "age":18,
    "sex":1
}

	@PostMapping("/five")
    public String five(@RequestBody User user){
        return user.toString();
    }

参数校检 （不同类型异常，返回提示）：

import org.springframework.context.support.DefaultMessageSourceResolvable;
import org.springframework.validation.BindException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.util.stream.Collectors;

/**
 * @author 小树
 */
@ControllerAdvice
public class WebExceptionHandler {


    /**
     * 处理请求参数格式错误 @RequestBody上validate失败后抛出的异常是MethodArgumentNotValidException异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseBody
    public Result MethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e) {
        String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
        //下边ResultCodeEnum.PARAMS_BS_ERROR.getCode()就是你自己自定义的返回code码
        return new Result().setCode(500).setMsg(message).setData(null);
    }

    /**
     * 处理Get请求中 使用@Valid 验证路径中请求实体校验失败后抛出的异常
     */
    @ExceptionHandler(BindException.class)
    @ResponseBody
    public Result BindExceptionHandler(BindException e) {
        String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
        return new Result().setCode(500).setMsg(message).setData(null);
    }

    /**
     * 处理请求参数格式错误 @RequestParam上validate失败后抛出的异常是ConstraintViolationException
     */
    @ExceptionHandler(ConstraintViolationException.class)
    @ResponseBody
    public Result ConstraintViolationExceptionHandler(ConstraintViolationException e) {
        String message = e.getConstraintViolations().stream().map(ConstraintViolation::getMessage).collect(Collectors.joining());
        return new Result().setCode(500).setMsg(message).setData(null);
    }

}

普通路径参数：

	@GetMapping("/getInfo")
    public Object get(@Valid @NotNull(message = "id不能为空") Integer id){
        return id;
    }

所有情况都校检：

	@PostMapping("/toDo")
    public Object toDo(@Validated User user){
        return user;
    }

@Data
public class User {

    @NotEmpty(message = "用户名不能为空")
    private String name;
    private Integer age;
    private Integer sex;

}

添加、编辑时校检

/**
 * 新增分组,新增时检查
 */
public interface ValidGroupInsert {

}
/**
 * 编辑时检查
 */
public interface ValidGroupEdit {

}

@Data
public class User {

    @NotEmpty(message = "用户名不能为空")
    private String name;

    @NotNull(message = "年龄不能为空",groups = {ValidGroupInsert.class, ValidGroupEdit.class})
    private Integer age;
    private Integer sex;

}

	@PostMapping("/add")
    public Object add(@Validated({ValidGroupInsert.class, ValidGroupEdit.class})
    	 @RequestBody User user){
        return user;
    }