Jpa 报错 ：HTTP Status 400 - Required String parameter 'xx' is not present

一、问题描述

使用Springboot JPA 做分页查询，报错Required String parameter 'xx' is not present，后端未接受到请求

二、解决方案：

使用的请求方法是GetMapping，这时候传不了参数，需要改为PostMapping才会有效

错误源码：

注意注解：@GetMapping

 package com.easylab.rentshop.controller;

 import com.easylab.rentshop.base.BaseResource;
 import com.easylab.rentshop.service.DepartmentService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
 import org.springframework.web.bind.annotation.*;

 import java.util.Map;

 /******************************
  * @author : liuyang
  * <p>ProjectName:rent-shop  </p>
  * @ClassName :  DepartmentController
  * @date : 2018/6/13 0013
  * @time : 15:31
  * @createTime 2018-06-13 15:31
  * @version : 2.0
  * @description :
  *
  *
  *
  *******************************/

 @RestController
 @RequestMapping("department")
 public class DepartmentController {

     @Autowired
     private DepartmentService departmentService;

     /**
      * @param pageStr
      * @param pageSizeStr
      * @return Page
      * <p>
      * <p>
      * required和defaultValue设置当请求没有参数的时候，默认设置参数值为1
      * 采用String类型接受，防止传入abc这种情况导致程序死掉
      */
     @GetMapping("/departmentPage")
     public Object departmentPage(@RequestParam(value = "pageStr", required = false, defaultValue = "1") String pageStr,
                                  @RequestParam(value = "pageSizeStr") String pageSizeStr) {

         int pageNo = 1;

         try {
             pageNo = Integer.valueOf(pageStr);

             if (pageNo < 1) {
                 pageNo = 1;
             }
         } catch (Exception e) {
         }

         int pageSize = 0;

         try {
             pageSize = Integer.valueOf(pageSizeStr);

             if (pageSize < 1) {
                 pageSize = 5;
             }
         } catch (Exception e) {
         }

         Page page = departmentService.getPage(pageNo, pageSize);

         return new BaseResource(page);
     }

 }

修改后：

 package com.easylab.rentshop.controller;

 import com.easylab.rentshop.base.BaseResource;
 import com.easylab.rentshop.service.DepartmentService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
 import org.springframework.web.bind.annotation.*;

 import java.util.Map;

 /******************************
  * @author : liuyang
  * <p>ProjectName:rent-shop  </p>
  * @ClassName :  DepartmentController
  * @date : 2018/6/13 0013
  * @time : 15:31
  * @createTime 2018-06-13 15:31
  * @version : 2.0
  * @description :
  *
  *
  *
  *******************************/

 @RestController
 @RequestMapping("department")
 public class DepartmentController {

     @Autowired
     private DepartmentService departmentService;

     /**
      * @param pageStr
      * @param pageSizeStr
      * @return Page
      * <p>
      * <p>
      * required和defaultValue设置当请求没有参数的时候，默认设置参数值为1
      * 采用String类型接受，防止传入abc这种情况导致程序死掉
      */
     @PostMapping("/departmentPage")
     public Object departmentPage(@RequestParam(value = "pageStr", required = false, defaultValue = "1") String pageStr,
                                  @RequestParam(value = "pageSizeStr") String pageSizeStr) {

         int pageNo = 1;

         try {
             pageNo = Integer.valueOf(pageStr);

             if (pageNo < 1) {
                 pageNo = 1;
             }
         } catch (Exception e) {
         }

         int pageSize = 0;

         try {
             pageSize = Integer.valueOf(pageSizeStr);

             if (pageSize < 1) {
                 pageSize = 5;
             }
         } catch (Exception e) {
         }

         Page page = departmentService.getPage(pageNo, pageSize);

         return new BaseResource(page);
     }

 }

使用PostMan进行接口测试：