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
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@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);
}
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服务A service
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//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;
}
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服务B 提供的B-Fegin
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@FeignClient(value = "frame-service",path = "/excelApi/v1")
public interface ExcelFreign extends ExcelApi {
}
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服务B api层 B-api
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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);
}
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服务B 实现api接口的action
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@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");
}
}
}
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服务B 调用服务A action层
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/**
*
* @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);
}
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2.服务B将查询出来的参数直接传递给服务A
服务A:
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/**
* 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");
}
}
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服务B：
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/**
*
* @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);
}
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设置浏览器头
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/**
* 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;
}
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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服务器之家网站的支持！
原文链接：https://blog.csdn.net/u010920327/article/details/80042276