Jpa 报错 ：HTTP Status 400

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：