spring自带RestTemplate发起http请求

package com.macro.mall.demo.controller;

import com.macro.mall.common.api.CommonResult;
import com.macro.mall.model.PmsBrand;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.linkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;

import java.util.HashMap;
import java.util.Map;


@Api(tags = "RestTemplateDemoController", description = "RestTemplate示例")
@Controller
@RequestMapping("/template")
public class RestTemplateDemoController {
    @Autowired
    private RestTemplate restTemplate;
    @Value("${host.mall.admin}")
    private String HOST_MALL_ADMIN;

    @ApiOperation("getForEntity url")
    @RequestMapping(value = "/get/{id}", method = RequestMethod.GET)
    @ResponseBody
    public Object getForEntity(@PathVariable Long id) {
        String url = HOST_MALL_ADMIN + "/brand/{id}";
        ResponseEntity responseEntity = restTemplate.getForEntity(url, CommonResult.class, id);
        return responseEntity.getBody();
    }

    @ApiOperation("getForEntity params")
    @RequestMapping(value = "/get2/{id}", method = RequestMethod.GET)
    @ResponseBody
    public Object getForEntity2(@PathVariable Long id) {
        String url = HOST_MALL_ADMIN + "/brand/{id}";
        Map params = new HashMap<>();
        params.put("id", String.valueOf(id));
        ResponseEntity responseEntity = restTemplate.getForEntity(url, CommonResult.class, params);
        return responseEntity.getBody();
    }

    @ApiOperation("getForEntity Uri")
    @RequestMapping(value = "/get3/{id}", method = RequestMethod.GET)
    @ResponseBody
    public Object getForEntity3(@PathVariable Long id) {
        String url = HOST_MALL_ADMIN + "/brand/{id}";
        UriComponents uriComponents = UriComponentsBuilder.fromUriString(url).build().expand(id).encode();
        ResponseEntity responseEntity = restTemplate.getForEntity(uriComponents.toUri(), CommonResult.class);
        return responseEntity.getBody();
    }

    @ApiOperation("getForObject url")
    @RequestMapping(value = "/get4/{id}", method = RequestMethod.GET)
    @ResponseBody
    public Object getForObject(@PathVariable Long id) {
        String url = HOST_MALL_ADMIN + "/brand/{id}";
        CommonResult commonResult = restTemplate.getForObject(url, CommonResult.class, id);
        return commonResult;
    }

    @ApiOperation("postForEntity jsonBody")
    @RequestMapping(value = "/post", method = RequestMethod.POST)
    @ResponseBody
    public Object postForEntity(@RequestBody PmsBrand brand) {
        String url = HOST_MALL_ADMIN + "/brand/create";
        ResponseEntity responseEntity = restTemplate.postForEntity(url, brand, CommonResult.class);
        return responseEntity.getBody();
    }

    @ApiOperation("postForEntity jsonBody")
    @RequestMapping(value = "/post2", method = RequestMethod.POST)
    @ResponseBody
    public Object postForObject(@RequestBody PmsBrand brand) {
        String url = HOST_MALL_ADMIN + "/brand/create";
        CommonResult commonResult = restTemplate.postForObject(url, brand, CommonResult.class);
        return commonResult;
    }

    @ApiOperation("postForEntity form")
    @RequestMapping(value = "/post3", method = RequestMethod.POST)
    @ResponseBody
    public Object postForEntity3(@RequestParam String name) {
        String url = HOST_MALL_ADMIN + "/productAttribute/category/create";
        //设置头信息
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        //构造表单参数
        MultiValueMap params= new linkedMultiValueMap<>();
        params.add("name", name);
        HttpEntity> requestEntity = new HttpEntity<>(params, headers);
        ResponseEntity responseEntity = restTemplate.postForEntity(url, requestEntity, CommonResult.class);
        return responseEntity.getBody();
    }
}

需要一个配置类

package com.macro.mall.demo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;


@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

这个类主要是发起一个http请求，请求下面这个类

package com.macro.mall.demo.controller;

import com.macro.mall.common.api.CommonPage;
import com.macro.mall.common.api.CommonResult;
import com.macro.mall.demo.dto.PmsBrandDto;
import com.macro.mall.demo.service.DemoService;
import com.macro.mall.model.PmsBrand;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import java.util.List;


@Api(tags = "DemoController", description = "品牌管理示例接口")
@Controller
public class DemoController {
    @Autowired
    private DemoService demoService;

    private static final Logger LOGGER = LoggerFactory.getLogger(DemoController.class);

    @ApiOperation(value = "获取全部品牌列表")
    @RequestMapping(value = "/brand/listAll", method = RequestMethod.GET)
    @ResponseBody
    public CommonResult> getBrandList() {
        return CommonResult.success(demoService.listAllBrand());
    }

    @ApiOperation(value = "添加品牌")
    @RequestMapping(value = "/brand/create", method = RequestMethod.POST)
    @ResponseBody
    public CommonResult createBrand(@Validated @RequestBody PmsBrandDto pmsBrand) {
        CommonResult commonResult;
        int count = demoService.createBrand(pmsBrand);
        if (count == 1) {
            commonResult = CommonResult.success(pmsBrand);
            LOGGER.debug("createBrand success:{}", pmsBrand);
        } else {
            commonResult = CommonResult.failed("操作失败");
            LOGGER.debug("createBrand failed:{}", pmsBrand);
        }
        return commonResult;
    }

    @ApiOperation(value = "更新品牌")
    @RequestMapping(value = "/brand/update/{id}", method = RequestMethod.POST)
    @ResponseBody
    public CommonResult updateBrand(@PathVariable("id") Long id, @Validated @RequestBody PmsBrandDto pmsBrandDto) {
        CommonResult commonResult;
        int count = demoService.updateBrand(id, pmsBrandDto);
        if (count == 1) {
            commonResult = CommonResult.success(pmsBrandDto);
            LOGGER.debug("updateBrand success:{}", pmsBrandDto);
        } else {
            commonResult = CommonResult.failed("操作失败");
            LOGGER.debug("updateBrand failed:{}", pmsBrandDto);
        }
        return commonResult;
    }

    @ApiOperation(value = "删除品牌")
    @RequestMapping(value = "/brand/delete/{id}", method = RequestMethod.GET)
    @ResponseBody
    public CommonResult deleteBrand(@PathVariable("id") Long id) {
        int count = demoService.deleteBrand(id);
        if (count == 1) {
            LOGGER.debug("deleteBrand success :id={}", id);
            return CommonResult.success(null);
        } else {
            LOGGER.debug("deleteBrand failed :id={}", id);
            return CommonResult.failed("操作失败");
        }
    }

    @ApiOperation(value = "分页获取品牌列表")
    @RequestMapping(value = "/brand/list", method = RequestMethod.GET)
    @ResponseBody
    public CommonResult> listBrand(@RequestParam(value = "pageNum", defaultValue = "1") Integer pageNum,
                                                        @RequestParam(value = "pageSize", defaultValue = "3") Integer pageSize) {
        List brandList = demoService.listBrand(pageNum, pageSize);
        return CommonResult.success(CommonPage.restPage(brandList));
    }

    @ApiOperation(value = "根据编号查询品牌信息")
    @RequestMapping(value = "/brand/{id}", method = RequestMethod.GET)
    @ResponseBody
    public CommonResult brand(@PathVariable("id") Long id) {
        return CommonResult.success(demoService.getBrand(id));
    }
}

这个类才是真正实现的类