RESTful接口开发

package com.aaaaaa.manager.controller;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import com.aaaaaa.manager.pojo.Item;

import com.aaaaaa.manager.service.ItemService;

@Controller

@RequestMapping("item/interface")

public class ItemInterfaceController {

    // http://127.0.0.1/query/1?rows=2

    // @RequestParam:获取请求参数的数据（包括表单提交的数据），就是获取rows=2 的2

    // @PathVariable:获取请求url路径上的数据，就是1

    @Autowired

    private ItemService itemService;

    // 根据id查询 GET

    // http://manager.aaaaaa.com/rest/item/interface/{id}

    /**

     * 根据id查询

     *

     * @param id

     * @return

     */

    @RequestMapping(value = "{id}", method = RequestMethod.GET)

    @ResponseBody

    public ResponseEntity<Item> queryItemById(@PathVariable Long id) {

        try {

            Item item = this.itemService.queryById(id);

            // 查询成功，返回200

            // return ResponseEntity.status(HttpStatus.OK).body(item);

            // return ResponseEntity.ok().body(item);

            return ResponseEntity.ok(item);

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        // 如果服务器出错，返回500

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);

    }

    // 新增 POST

    // http://manager.aaaaaa.com/rest/item/interface

    /**

     * 新增

     *

     * @param item

     * @return

     */

    @RequestMapping(method = RequestMethod.POST)

    // @ResponseBody:不加这个注解就会走视图解析器，返回页面，加这个注解就走转换器，返回数据

    // 加上@ResponseBody注解和返回ResponseEntity效果是一样的，都会走转换器，返回数据，所以使用任意一个即可，两个都用也没问题

    public ResponseEntity<Void> saveItem(Item item) {

        try {

            this.itemService.save(item);

            // 新增成功，返回201

            return ResponseEntity.status(HttpStatus.CREATED).build();

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        // 如果服务器出错，返回500

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);

    }

    // 更新 PUT

    // http://manager.aaaaaa.com/rest/item/interface

    /**

     * 更新

     *

     * @param item

     * @return

     */

    @RequestMapping(method = RequestMethod.PUT)

    public ResponseEntity<Void> updateItem(Item item) {

        try {

            this.itemService.updateByIdSelective(item);

            // 修改成功，返回204

            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        // 如果服务器出错，返回500

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);

    }

    // 根据id删除 DELETE

    // http://manager.aaaaaa.com/rest/item/interface/{id}

    /**

     * 根据id删除

     *

     * @param id

     * @return

     */

    @RequestMapping(value = "{id}", method = RequestMethod.DELETE)

    public ResponseEntity<Void> deleteItemById(@PathVariable Long id) {

        try {

            this.itemService.deleteById(id);

            // 删除成功，返回204

            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        // 如果服务器出错，返回500

        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);

    }

}