@FeignClient 调用远程服务

最新推荐文章于 2025-07-04 14:41:44 发布

原创最新推荐文章于 2025-07-04 14:41:44 发布 · 3.5k 阅读

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本文详细介绍了如何使用RESTful API进行参数传递，包括路径变量、请求体中的Map参数以及通过restTemplate调用服务的方法。同时，探讨了上传文件并部署Activiti流程的实现，以及如何加载和返回图片资源。

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一、传参数

1、restful传

service调用

@RequestMapping("/act/delDeployById/{deployId}")
public void delDeployById(@PathVariable("deployId") String deployId);

服务controller

@RequestMapping("/act/delDeployById/{deployId}")
public void delDeployById(@PathVariable("deployId") String deployId){

2、通过参数实体传送,通过把所有参数放到Map里边

service调用

@RequestMapping("/act/queryProDefList")
public List<Map<String, Object>> queryProDefList(@RequestBody Map<String,Object>paramMap);

服务controller

@RequestMapping("/act/queryProDefList")
public List<Map<String, Object>> queryProDefList(@RequestBody Map<String,Object>paramMap){

Integer startIndex = (Integer) paramMap.get("startIndex");
Integer pageSize = (Integer) paramMap.get("pageSize");

}

3、通过restTemplate调用服务

上传文件（意思就是上传以后然后部署activiti流程）

@ResponseBody
   @RequestMapping("/upload")
   public Object upload(HttpServletRequest req){
       start();
       try {
           MultipartHttpServletRequest request = (MultipartHttpServletRequest)req;
           MultipartFile file = request.getFile("procDefFile");
           System.out.println(file.getName());
           System.out.println(file.getOriginalFilename());
           String filename = file.getOriginalFilename();
           String uuid = UUID.randomUUID().toString();
           File createTempFile = File.createTempFile(uuid, filename.substring(filename.lastIndexOf(".") ));
           file.transferTo(createTempFile);

           FileSystemResource resource = new FileSystemResource(createTempFile);
           MultiValueMap<String, Object> param = new LinkedMultiValueMap<String, Object>();
           param.add("pdfile", resource);
           String postForObject = restTemplate.postForObject("http://atcrowdfunding-activiti-service/act/deploy", param,String.class);
           System.out.println("result"+postForObject);
           createTempFile.delete();
           success(true);
       } catch (Exception e) {
           e.printStackTrace();
           success(false);
       }

       return end();
   }

@RequestMapping("/act/deploy")
   public String deploy(@RequestParam("pdfile") MultipartFile file){
       start();
       try {
           repositoryService.createDeployment()
           .addInputStream(file.getOriginalFilename(), file.getInputStream())
           .deploy();
           return "成功";
       } catch (Exception e) {
           e.printStackTrace();
           return "失败";
       }

   }

四、加载图片（把图片下载下来）

@ResponseBody
   @RequestMapping("/load")
   public void load(String pdid,HttpServletResponse resp) throws Exception{
       //通过响应头返回图形信息
       HttpHeaders httpHeader = new HttpHeaders();
       httpHeader.setContentType(MediaType.IMAGE_PNG);
       String url="http://atcrowdfunding-activiti-service/act/loadImgById/"+pdid;

       ResponseEntity<byte[]> reponse=restTemplate.exchange(url,HttpMethod.POST,
               new HttpEntity<byte[]>(httpHeader), byte[].class);
       byte[] result = reponse.getBody();

       InputStream in = new ByteArrayInputStream(result);

       OutputStream out = resp.getOutputStream();

       int i = -1;
       while((i=in.read())!=-1){
           out.write(i);
       }
   }

@RequestMapping("/act/loadImgById/{pdid}")
   public byte[] loadImgById(@PathVariable("pdid") String pdid) throws Exception{
       ProcessDefinitionQuery query = repositoryService.createProcessDefinitionQuery();
       ProcessDefinition singleResult = query.processDefinitionId(pdid).singleResult();
       InputStream in = repositoryService.getResourceAsStream(singleResult.getDeploymentId(), singleResult.getDiagramResourceName());

       ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
       byte[] buf = new byte[100];
       int rc = 0;
       while((rc=in.read(buf,0,100))>0){
           swapStream.write(buf,0,rc);
       }
       byte[] byteArray = swapStream.toByteArray();
       return byteArray;

   }