使用微服务的时候往往服务之间调用比较麻烦，spring cloud提供了Feign接口调用，RestTemplate调用的方式

这里我探讨下RestTemplate调用的方式：

服务A:接收三个对象参数 这三个参数的是通过数据库查询出来的

服务B:要调用服务A 服务B提供了查询三个参数的方法，后面要使用三个参数

对于服务A,处理的方式有两中

1. 服务B提供一个Feign接口将查询三个参数的方法公开，服务A直接引用Feign来查询参数，服务B只需要将三个查询关键字传递过去即可

服务A action

@PostMapping("/import/{busiCode}/{filePath}") public Map<String,String> importExcel(@PathVariable("filePath") String filePath,@PathVariable("busiCode") String busiCode,@RequestBody Map<String, String> params, HttpServletRequest request,HttpServletResponse response) { response.setCharacterEncoding("UTF-8"); UserInfo user = UserUtil.getUser(); return excelService.importExcel(filePath,busiCode,params,user); }

服务A service

//引入Feign接口 private ExcelFreign excelFreign; public Map<String,String> importExcel(String filePath, String busiCode,Map<String, String> params,UserInfo user ) { Map<String,String> result=new HashMap<String,String>(); excelFreign = SpringTool.getApplicationContext().getBean(ExcelFreign.class); CmdImportConfigDto configDto = excelFreign.getCmdImportConfigByBusiCode(busiCode); CmdImportDto importDto=new CmdImportDto(); importDto.setImportConfigId(configDto.getId()); importDto.setExcelPath(filePath); importDto.setParam(new GsonBuilder().create().toJson(params)); importDto.setLog(""); Long impId=null; try { impId= Long.valueOf(excelFreign.saveCmdImportDto(importDto)); } catch (Exception e1) { e1.printStackTrace(); result.put("error", "保存出现异常"); result.put("message", e1.getMessage()); return result; } try{ excelFreign.updateImportStatus(impId, ImportConstant.ImportStatus.SUBMIT, "提交成功"); }catch(Exception e){ e.printStackTrace(); } ValidateTask validateTask=new ValidateTask(); validateTask.init(impId,filePath, busiCode, params,user); String message; try { message = validateTask.call(); } catch (Exception e) { e.printStackTrace(); result.put("error", "验证出现异常"); result.put("message", e.getMessage()); return result; } if(message!=null){ result.put("error", "验证不通过"); result.put("message", message); return result; } PersistTask persistTask=new PersistTask(); persistTask.init(impId,filePath, busiCode, params,user); result.putAll(ImportQueue.submit(persistTask)); return result; }

服务B 提供的B-Fegin

@FeignClient(value = "frame-service",path = "/excelApi/v1") public interface ExcelFreign extends ExcelApi { }

服务B api层 B-api

public interface ExcelApi { /** * 更新状态 * @param impId * @param importType * @param result */ @PostMapping("/updateImportStatus/{impId}/{importType}/{result}") void updateImportStatus(@PathVariable("impId") Long impId, @PathVariable("importType") String importType, @PathVariable("result") String result) throws Exception; /** * 获取导入配置项 * @param busiCode * @return */ @GetMapping("/getImportConfig/{busicode}") CmdImportConfigDto getCmdImportConfigByBusiCode(@PathVariable("busicode") String busiCode); /** * 保存信息 * @param importDto * @return */ @PostMapping("/saveImport") String saveCmdImportDto(@RequestBody CmdImportDto importDto); }

服务B 实现api接口的action

@RestController @RequestMapping("/excelApi/v1") public class ExcelFeignAction implements ExcelApi { @Autowired private CmdExportService exportService; /** * 获取导入配置项 * @param busiCode * @return */ @GetMapping("/getImportConfig/{busicode}") public CmdImportConfigDto getCmdImportConfigByBusiCode(@PathVariable("busicode") String busiCode){ return cmdImportConfigService.getCmdImportConfigByBusiCode(busiCode); } /** * 更新状态 * @param impId * @param importStatus * @param result */ @PostMapping("/updateImportStatus/{impId}/{importType}/{result}") public void updateImportStatus(@PathVariable("impId") Long impId, @PathVariable("importType") String importStatus, @PathVariable("result") String result) throws Exception{ cmdImportService.updateImportStatus(impId,importStatus,new Date() , result); } /** * 保存信息 * @param importDto * @return */ @PostMapping("/saveImport") public String saveCmdImportDto(@RequestBody CmdImportDto importDto){ try{ cmdImportService.saveCmdImportDto(importDto); return importDto.getId(); }catch (Exception e){ e.printStackTrace(); throw new BusinessRuntimeException("系统出现异常"); } } }

服务B 调用服务A action层

/** * * @param busicode 导出的业务编码 能确定某个模块做导出操作 * @param values 请求参数 * * 通过restTemplate 传递复杂参数 * @return * 返回 文件流 让浏览器弹出下载 */ @PostMapping(value = "/export/v3/{busicode}") @ResponseBody public ResponseEntity<byte[]> expDownLoadV3(@PathVariable("busicode") String busicode , @RequestBody Map<String,Object> values, HttpServletRequest request)throws Exception { if(StringUtils.isBlank(busicode)){ throw new BusinessRuntimeException("参数错误,请检查参数是否正确,busicode ?"); } // 获取执行过程 Map map = restTemplate.postForObject("http://" + serviceId + "/excelApi/v1/文件名"/"+busicode,values,Map.class); String path = (String)map.get("filepath"); byte[] excel = FastDFSClient.downloadToBytes(path); CmdExportConfigDto cmdExportConfig = exportService.getCmdExportConfigByBusiCode(busicode); //获取文件名 String fileName = cmdExportConfig.getReportName(); // 获取文件后缀名 String extFileName = path.substring(path.lastIndexOf('.')+1); HttpHeaders headers = new HttpHeaders(); // 获取用户浏览器的种类 对不同的浏览器进行编码处理 final String userAgent = request.getHeader("USER-AGENT"); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); headers.setContentDispositionFormData("attachment", FrameUrlConstants.transFromFileName(userAgent,fileName) + "." + extFileName); return new ResponseEntity<byte[]>(excel,headers,HttpStatus.OK); }

2.服务B将查询出来的参数直接传递给服务A

服务A:

/** * 接收参数传递 * 分别接收下面三种key value的键值对 * cmdExportConfig:CmdExportConfigDto * exportFieldList:List<CmdExportFieldConfigDto> * params:Map * @param params * @param request * @param response * @return */ @PostMapping("/export/v2") public ResponseEntity exportExcel(@RequestBody Map<String,Object> params,HttpServletRequest request,HttpServletResponse response) { response.setCharacterEncoding("UTF-8"); try { // 将文件的路径获取到 ObjectMapper mapper = new ObjectMapper(); LinkedHashMap requestParMap = (LinkedHashMap)params.get("cmdExportConfig"); CmdExportConfigDto cmdExportConfigDto = null; List<CmdExportFieldConfigDto> exportFieldList = null; if(requestParMap.size()>0){ cmdExportConfigDto = mapper.convertValue(requestParMap,CmdExportConfigDto.class); } ArrayList arrayList = (ArrayList)params.get("exportFieldList"); if(arrayList.size()>0){ exportFieldList = mapper.convertValue(arrayList, new TypeReference<CmdExportFieldConfigDto>() {}); } Map values = (Map)params.get("params"); String filePath = excelService.exportExcel(cmdExportConfigDto,exportFieldList,params,request.getServletContext().getRealPath("/")); Map<String,String> map = new HashMap<String, String>(); map.put("filepath", filePath); return new ResponseEntity(map,HttpStatus.OK); }catch (IOException e){ throw new RuntimeException("输出文件出错"); } }

服务B：

/** * * @param busicode 导出的业务编码 能确定某个模块做导出操作 * @param values 请求参数 * * 通过restTemplate 传递复杂参数 * @return * 返回 文件流 让浏览器弹出下载 目前需要解决 将字节流响应到浏览器的控制台了 后面均采用url下载的方式 */ @PostMapping(value = "/export/v3/{busicode}",produces = MediaType.TEXT_PLAIN_VALUE) @ResponseBody public ResponseEntity<byte[]> expDownLoadV3(@PathVariable("busicode") String busicode , @RequestBody Map<String,Object> values, HttpServletRequest request)throws Exception { String busiCode = values.get("busiCode").toString(); if(StringUtils.isBlank(busiCode)){ throw new BusinessRuntimeException("参数错误,请检查参数是否正确,busiCode ?"); } // 获取执行过程 Map map = excuteRestTemplate(busiCode,values); String path = (String)map.get("filepath"); byte[] excel = FastDFSClient.downloadToBytes(path); CmdExportConfigDto cmdExportConfig = exportService.getCmdExportConfigByBusiCode(busiCode); //获取文件名 String fileName = cmdExportConfig.getReportName(); // 获取文件后缀名 String extFileName = path.substring(path.lastIndexOf('.')+1); HttpHeaders headers = new HttpHeaders();erAgent = request.getHeader("USER-AGENT"); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); headers.setContentDispositionFormData("attachment", FrameUrlConstants.transFromFileName(userAgent,fileName) + "." + extFileName); return new ResponseEntity<byte[]>(excel,headers,HttpStatus.OK); } /** * 执行请求调用 * @param busiCode * @param variables * @return */ private Map excuteRestTemplate(String busiCode,Map variables){ String serviceId=""; //查询导出配置 CmdExportConfigDto cmdExportConfig = exportService.getCmdExportConfigByBusiCode(busiCode); serviceId = cmdExportConfig.getSystemType(); if(cmdExportConfig==null){ throw new BusinessRuntimeException("没有导出配置无法导出"); } //根据导出配置id获取导出字段信息 List<CmdExportFieldConfigDto> exportFieldList = exportService.getAllCmdExportFieldConfigDtoByConfigId(cmdExportConfig.getId()); if(StringUtils.isBlank(serviceId)){ throw new BusinessRuntimeException("未配置导出的服务"); } Map<String, Object> uriVariables = new HashMap<>(); uriVariables.put("cmdExportConfig",cmdExportConfig); uriVariables.put("exportFieldList",exportFieldList); uriVariables.put("params",variables); return restTemplate.postForObject("http://" + serviceId + "/excelService/export/v2",new HttpEntity(uriVariables),Map.class); }

设置浏览器头

/** * 根据不同的浏览器类型设置下载文件的URL编码 * @param userAgent * @param fileName * @return * @throws Exception */ public static String transFromFileName(String userAgent,String fileName) throws Exception{ String finalFileName = ""; if(StringUtils.contains(userAgent, "MSIE")){//IE浏览器 finalFileName = URLEncoder.encode(fileName,"UTF-8"); }else if(StringUtils.contains(userAgent, "Mozilla")){//google,火狐浏览器 finalFileName = new String(fileName.getBytes("GBK"), "ISO8859-1"); }else{ finalFileName = URLEncoder.encode(fileName,"UTF-8");//其他浏览器 } return finalFileName; }

总结

以上所述是小编给大家介绍的Spring cloud restTemplate 传递复杂参数的方式(多个对象)，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！