Swagger結合mustache模板生成後臺接口代碼、以及前後臺建模代碼
之前項目中使用的的thrift來建模,維護前後臺模型以及rest接口,前臺使用的是angular2;
但是使用thrift只能生成建模,後臺的rest接口的Controller文件還是需要手動去寫,一旦接口改動就會涉及到很多方面。
由此準備使用Swagger和mustache模板來做一個maven插件直接生成前臺ts文件和後臺java文件以及rest接口文件。只需要維護swagger的yaml文件。
yaml文件:
swagger: "2.0"
info:
description: "This is a sample server Petstore server."
version: "1.0.0"
title: "Swagger Petstore"
termsOfService: "http://swagger.io/terms/"
contact:
email: "[email protected]"
license:
name: "Apache 2.0"
url: "http://www.apache.org/licenses/LICENSE-2.0.html"
host: "petstore.swagger.io"
basePath: "/v2"
#tags Controller類名
tags:
- name: "UserRestApi"
schemes:
- "https"
- "http"
# paths rest接口相關信息
paths:
/user/{username}:
#get 請求方式 post put...
get:
tags:
- "UserRestApi"
summary: "Get user by user name"
description: ""
#operationId:接口方法名
operationId: "getUserByName"
produces:
- "application/xml"
- "application/json"
parameters:
- name: "username"
#in:path路徑傳參(占位符傳參) body消息體傳參 query問號傳參 ...
in: "path"
description: "The name that needs to be fetched. Use user1 for testing. "
required: true
type: "string"
responses:
200:
description: "successful operation"
# schema $ref 自定義模型(非基礎數據類型)
schema:
$ref: "#/definitions/User"
400:
description: "Invalid username supplied"
404:
description: "User not found"
#definitions 前後臺模型相關信息
definitions:
User:
type: object
properties:
id:
type: integer
#int64 Long int32 Integer
format: int64
petId:
type: integer
format: int64
quantity:
type: integer
format: int32
shipDate:
type: string
format: date-time
status:
type: string
description: Order Status
enum:
- placed
- approved
- delivered
complete:
type: boolean
生成的Controller文件:
package ni.jun.yang.api; import javax.servlet.http.HttpServletRequest; 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.RestController;import ni.jun.yang.api.bean.User; @RestController public class UserRestApi { //接口註入,邏輯均在實現類中實現 UserRestApiHandle handle; @RequestMapping(value = "/user/{userName}",method = RequestMethod.GET) public User getUserByName(HttpServletRequest request, @PathVariable String userName) {//TODO return handle.getUserByName(request, username); } }
同時還生成對應User類,UserRestApiHandle 接口,對於"/user/{username}"接口的邏輯實現只需要在UserRestApiHandle接口的實現類中去具體實現即可。
Controller類,UserRestApiHandle 接口,java模型,前臺ts模型均是根據yaml文件自動生成。如此以來rest接口維護就只需要關註yaml文件,以及UserRestApiHandle 實現類裏面的邏輯就可以了。
1.maven依賴:
<dependencies> <dependency> <groupId>io.swagger</groupId> <artifactId>swagger-codegen</artifactId> <version>2.1.5</version> </dependency> <dependency> <groupId>com.github.spullara.mustache.java</groupId> <artifactId>compiler</artifactId> <version>0.9.2</version> </dependency>
2.mustache模板語法一搜一大把:https://www.cnblogs.com/DF-fzh/p/5979093.html
模板解析的時候主要是兩種,一種根據map的key獲取對應的value,一種是根據對象的屬性名獲取相應的值
3.獲取yaml文件內容(讀文件)轉化成Swagger對象
String info = FileUtils.readFile(filePath); //將yaml文件轉化為Swagger對象 Swagger swagger = new SwaggerParser().parse(info);
4.
package ni.jun.yang; import io.swagger.codegen.ClientOptInput; import io.swagger.codegen.ClientOpts; import io.swagger.models.Swagger; import io.swagger.parser.SwaggerParser; import ni.jun.yang.ApiCodegen; import ni.jun.yang.JavaServiceCodegen; import ni.jun.yang.Util.FileUtils; import java.io.*; public class SwaggerTest { public void Test(String filePath) throws IOException { String info = FileUtils.readFile(filePath); //將yaml文件轉化為Swagger對象 Swagger swagger = new SwaggerParser().parse(info); //JavaServiceCodegen繼承JavaClientCodegen(存放類的信息,類型對應["integer", "Integer"]表等等),用於擴展一些自定義功能 JavaServiceCodegen serviceCodegen = new JavaServiceCodegen(); ClientOptInput input = new ClientOptInput().opts(new ClientOpts()).swagger(swagger); input.setConfig(serviceCodegen); ApiCodegen apiCodegen = new ApiCodegen(); apiCodegen.opts(input).generate(); } }
import io.swagger.codegen.*; import io.swagger.codegen.languages.JavaClientCodegen; public class JavaServiceCodegen extends JavaClientCodegen { public JavaServiceCodegen() { apiPackage = "ni.jun.yang.api"; modelPackage = "ni.jun.yang.api.bean"; modelTemplateFiles.put("bean.mustache", ".java"); apiTemplateFiles.put("servicerest.mustache", ".java"); } }
5.組裝yaml信息解析模板文件,生成各類文件
package ni.jun.yang; import com.samskivert.mustache.Mustache; import com.samskivert.mustache.Template; import io.swagger.codegen.DefaultGenerator; import io.swagger.models.Path; import io.swagger.models.parameters.Parameter; import io.swagger.models.parameters.PathParameter; import io.swagger.models.properties.Property; import io.swagger.models.properties.RefProperty; import ni.jun.yang.Util.FileUtils; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class ApiCodegen extends DefaultGenerator { public List<File> generate() { List <Map<String,Object>> infoList = new ArrayList<>(); List <Map<String,String>> importList = new ArrayList<>(); Map<String,Path> pathMap = swagger.getPaths(); Info info = new Info(); info.apiPackage = config.apiPackage(); info.modelPackage = config.modelPackage(); info.basePath = swagger.getBasePath(); info.className = swagger.getTags().get(0).getName(); for (Map.Entry<String,Path> entry : pathMap.entrySet()) { Map<String,Object> infoMap = new HashMap<>(); infoMap.put("urlName", entry.getKey()); Path path = entry.getValue(); changeType(path,infoMap,importList); infoMap.put("path",path); infoList.add(infoMap); } info.infoList = infoList; info.importList = importList; String outputFilePath = "src/main/java/ni/jun/yang/api/" + info.className + ".java"; String templateFilePath = "src/main/resources/servicerest.mustache"; String templateFileInfo = ""; try { //獲取模板信息 templateFileInfo = FileUtils.readFile(templateFilePath); //生成模板 Template template = Mustache.compiler().compile(templateFileInfo); //解析模板 String result = template.execute(info); //生成Controller文件 FileUtils.writeFile(result, outputFilePath); } catch (IOException e) { e.printStackTrace(); } return null; } private void changeType(Path path, Map<String,Object> infoMap, List <Map<String,String>> importList) { List<Parameter> parameterList; Map<String, String> typeMap = config.typeMapping(); if (path.getGet() != null) { infoMap.put("hasGet", true); parameterList = path.getGet().getParameters(); for (Parameter parameter : parameterList) { PathParameter pathParameter = (PathParameter)parameter; pathParameter.setType(typeMap.get(pathParameter.getType())); } Property property = path.getGet().getResponses().get("200").getSchema(); if (property != null) { RefProperty refProperty = (RefProperty)property; infoMap.put("responseType", refProperty.getSimpleRef()); Map<String,String> map = new HashMap<>(); map.put("import",config.modelPackage() + "." + refProperty.getSimpleRef()); importList.add(map); } } //TODO 其他幾種請求 put,post,delete... } class Info { public String apiPackage; public String modelPackage; public String basePath; public String className; public List <Map<String,String>> importList; public List <Map<String,Object>> infoList; } }
6.mustcahe模板文件:
package {{apiPackage}};
import javax.servlet.http.HttpServletRequest;
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.RestController;
{{#importList}}
import {{{import}}};
{{/importList}}
@RestController
public class {{className}}
{
//接口註入,邏輯均在實現類中實現
{{className}}Handle handle;
{{#infoList}}
{{#hasGet}}
@RequestMapping(value = "{{urlName}}",method = RequestMethod.GET)
public {{responseType}} {{path.get.operationId}}(HttpServletRequest request{{#path.get.parameters}}, @PathVariable {{type}} {{name}}{{/path.get.parameters}}) {
//TODO
return handle.{{path.get.operationId}}(request{{#path.get.parameters}}, {{name}}{{/path.get.parameters}});
}
{{/hasGet}}
{{/infoList}}
}
7.總結:使用Swagger結合mustache模板生成後臺接口代碼、以及前後臺建模代碼大致流程就這樣,這裏只貼出了生成Controller的相關代碼,生成前後臺模型也是根據自己的需求來重新組裝yaml解析之後的definitions信息即可。
重點是要知道模板解析的時候兩種獲取值的方式:通過類屬性獲取和根據key獲取value,就可以根據自己需求來組裝傳入模板解析時候對象。
最終要使用這些代碼最好的還是做成maven插件(https://www.cnblogs.com/wangxinblog/p/8654400.html),編譯即可生成相關的jar包。
8.swaager yaml文件中自帶的標簽可能不能滿足我們的需求,我們需要擴展一些標簽,擴展標簽要以x-開頭,這些信息會放入到swagger對象的vendorExtensions屬性下。如 x-abc: aaa
Swagger結合mustache模板生成後臺接口代碼、以及前後臺建模代碼