Redkale RESTful 插件介绍

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Redkale REST插件介绍

        org.redkalex.rest 是基于HTTP服务的REST插件,提供了很简单的REST服务接口方便开发。REST根据加载的Service组件自动生成对应的HttpServlet。其接口比Spring Boot之类的REST服务框架要简化得多,不需要进行注解配置也可以按REST服务加载。

快速上手

        为了让REST生效,必须配置 application.xml 中 HTTP 的 <server> 节点的nodeInterceptor属性值为 org.redkalex.rest.RestNodeInterceptor 。
        同时必须在<server> 节点 里增加 <rest> 子节点。配置介绍如下:

<application port="5001">           <resources>          <!-- ... -->    </resources>     <!--            nodeInterceptor: 值必须要是 org.redkalex.rest.RestNodeInterceptor,且只能配置在protocol="HTTP"的server节点上,REST服务才会生效。    -->    <server protocol="HTTP" port="6060" nodeInterceptor="org.redkalex.rest.RestNodeInterceptor">         <!--            REST的核心配置项           base:     REST服务的BaseServlet,必须是 org.redkalex.rest.RestHttpServlet 的子类,该属性值没有默认值,必须指定。           autoload:默认值"true"  默认值. 加载当前server所能使用的Servce对象;               mustsign:默认值"false" 是否只加载标记为RestController的Service类,默认加载所有可用Service           includes:当autoload="true", 拉取类名与includes中的正则表达式匹配的类, 多个正则表达式用分号;隔开           excludes:当autoload="true", 排除类名与excludes中的正则表达式匹配的类, 多个正则表达式用分号;隔开        -->        <rest base="org.redkalex.test.rest.SimpleRestServlet" mustsign="false" autoload="true" includes="" excludes="">            <!--                value:  Service类名,列出的表示必须被加载的Service对象, 且对象的Resource资源名称只能是""。            -->            <service value="com.xxx.XXXXService"/>        </rest>        <!-- 其他配置... -->    </server></application>                

        通常配置都需要编写一个 org.redkalex.rest.RestHttpServlet 子类,主要用于获取当前用户信息和鉴权,且必须指定具体的User对象类。开发者的实现类可以参考redkale-demo 中的BaseServlet类,以下是一个简单的范例: 

public class SimpleRestServlet extends RestHttpServlet<UserInfo> {    @Resource    private UserService userService;    //获取当前用户信息    @Override    protected UserInfo currentUser(HttpRequest req) throws IOException {        String sessionid = req.getSessionid(false);        if (sessionid == null || sessionid.isEmpty()) return null;        return userService.current(sessionid);    }    //普通鉴权    @Override    public boolean authenticate(int module, int actionid, HttpRequest request, HttpResponse response) throws IOException {        UserInfo info = currentUser(request);        if (info == null) {            response.addHeader("retcode", RetCodes.RET_USER_UNLOGIN);            response.addHeader("retmessage", "Not Login");            response.setStatus(203);            response.finish("{'success':false, 'message':'Not Login'}");            return false;        } else if (!info.checkAuth(module, actionid)) { // 根据module、actionid进行鉴权            response.addHeader("retcode", RetCodes.RET_USER_AUTH_ILLEGAL);            response.addHeader("retmessage", "No Authority");            response.setStatus(203);            response.finish("{'success':false, 'message':'No Authority'}");            return false;        }        return true;    }}                

        编写完 org.redkalex.rest.RestHttpServlet 子类后就需要对Service进行设置,设置需要三大注解:@RestController、@RestMapping、@RestParam。 

@RestController : 

/** * 只能依附在Service类上,value默认为Service的类名去掉Service字样的字符串 (如HelloService,的默认路径为 hello)。 */@Target({TYPE})public @interface RestController {    boolean ignore() default false; //是否屏蔽该类的转换    String value() default ""; //模块名, 只能是模板名,不能含特殊字符    boolean repair() default true; //同@WebServlet的repair属性    int module() default 0; //模块ID值,鉴权时用到}                


@RestMapping : 

/** * 只能依附在Service实现类的public方法上 * value默认为"/" + Service的类名去掉Service及后面字样的小写字符串 (如HelloService,的默认路径为/hello)。 */@Target({METHOD})public @interface RestMapping {    boolean ignore() default false; //是否屏蔽该方法的转换    //请求的方法名, 不能含特殊字符    //默认为方法名的小写(若方法名以createXXX、updateXXX、deleteXXX、queryXXX、findXXX且XXXService为Service的类名将只截取XXX之前)    String name() default "";    boolean authignore() default true; //是否跳过鉴权,默认跳过     int actionid() default 0; //操作ID值,鉴权时用到    String contentType() default "";  //设置Response的ContentType 默认值为 text/plain; charset=utf-8    String jsvar() default ""; //以application/javascript输出对象是指明js的对象名,该值存在时则忽略contentType()的值}                


@RestParam : 

/** * 只能依附在Service类的方法的参数上, http请求的参数名 */@Target({PARAMETER})public @interface RestParam {    String value(); //参数名}                

        REST的设置方式有两大种: 一种是采用默认REST注解,一种是显式的设置。 
第一种方式需要开发者对Service中的方法命名需要遵循一定规则, 如下范例,模块为Hello,Service类命名为HelloService,增删改查的方法采用createHello、deleteHello、updateHello、queryHello或其他xxxHello命名。REST插件加载任何没有标记@RestController、@RestMapping、@RestParam 的Service将按照一定规则生成默认值:
        1、@RestController.value() 默认值为Service类名的小写化并去掉service及后面字样, 视为模块名 
        2、@RestMapping.name() 默认值为Service的方法名小写化并去掉模块名字样 
        2、@RestParam.value() 如果方法名以find、delete开头且方法的参数只有一个且参数类型是基本数据类型或String,则默认值为"#";若使用Java 8中带上 -parameters 编译项的新特性,默认值为参数名, 若没使用新特性则采用bean、bean2、bean3...的命名规则。

/** * 类说明: * Flipper : Source组件中的翻页对象, 只要Service方法中的参数类与该类相同,则不需要设定 @RestParam * UserInfo :当前用户类, 只要Service方法中的参数类与该类相同,则不需要设定 @RestParam * HelloEntity: Hello模块的实体类 * HelloBean: Hellow模块实现FilterBean的过滤Bean类 * */@RestController(value = "hello", module = 0, repair = true, ignore = false)public class HelloService implements Service {    @Resource    private DataSource source;    //增加记录    @RestMapping(name = "create", authignore = true)    public RetResult<HelloEntity> createHello(UserInfo info, @RestParam("bean") HelloEntity entity) { //通过 /hello/create?bean={...} 增加对象        entity.setCreator(info == null ? 0 : info.getUserid()); //设置当前用户ID        entity.setCreatetime(System.currentTimeMillis());        source.insert(entity);        return new RetResult<>(entity);    }    //删除记录    @RestMapping(name = "delete", authignore = true)    public void deleteHello(@RestParam("#") int id) { //通过 /hello/delete/1234 删除对象        source.delete(HelloEntity.class, id);    }    //修改记录    @RestMapping(name = "update", authignore = true)    public void updateHello(@RestParam("bean") HelloEntity entity) { //通过 /hello/update?bean={...} 修改对象        entity.setUpdatetime(System.currentTimeMillis());        source.update(entity);    }    //查询列表    @RestMapping(name = "query", authignore = true)    public Sheet<HelloEntity> queryHello(@RestParam("bean") HelloBean bean, Flipper flipper) { //通过 /hello/query/start:0/size:20?bean={...} 查询列表        return source.querySheet(HelloEntity.class, flipper, bean);    }    //查询单个    @RestMapping(name = "find", authignore = true)    public HelloEntity findHello(@RestParam("#") int id) {  //通过 /hello/find/1234 查询对象        return source.find(HelloEntity.class, id);    }}                

        根据默认命名规则可以看出,以上范例生成的RestServlet与去掉所有@RestController、@RestMapping、@RestParam后的Service生成的是完全相同的。 REST插件根据Service会动态生成HttpServlet,以上范例生成的HttpServlet如下:

@WebServlet(value = {"/hello/*"}, repair = true)public class _DynHelloRestServlet extends SimpleRestServlet {    @Resource    private HelloService _service;    @AuthIgnore    @WebAction(url = "/hello/create")    public void create(HttpRequest req, HttpResponse resp) throws IOException {        HelloEntity bean = req.getJsonParameter(HelloEntity.class, "bean");        UserInfo user = currentUser(req);        RetResult<HelloEntity> result = _service.createHello(user, bean);        sendRetResult(resp, result);    }    @AuthIgnore    @WebAction(url = "/hello/delete/")    public void delete(HttpRequest req, HttpResponse resp) throws IOException {        int id = Integer.parseInt(req.getRequstURILastPath());        _service.deleteHello(id);        sendRetResult(resp, RetResult.SUCCESS);    }    @AuthIgnore    @WebAction(url = "/hello/update")    public void update(HttpRequest req, HttpResponse resp) throws IOException {        HelloEntity bean = req.getJsonParameter(HelloEntity.class, "bean");        _service.updateHello(bean);        sendRetResult(resp, RetResult.SUCCESS);    }    @AuthIgnore    @WebAction(url = "/hello/query")    public void query(HttpRequest req, HttpResponse resp) throws IOException {        HelloBean bean = req.getJsonParameter(HelloBean.class, "bean");        Flipper flipper = findFlipper(req);        Sheet<HelloEntity> result = _service.queryHello(bean, flipper);        resp.finishJson(result);    }    @AuthIgnore    @WebAction(url = "/hello/find/")    public void find(HttpRequest req, HttpResponse resp) throws IOException {        int id = Integer.parseInt(req.getRequstURILastPath());        HelloEntity bean = _service.findHello(id);        resp.finishJson(bean);    }}                

        REST的第二种设置方式是显式的设置, 看如下范例:

/** * 类说明: * Flipper : Source组件中的翻页对象 * UserInfo :当前用户类 * HelloEntity: Hello模块的实体类 * HelloBean: Hellow模块实现FilterBean的过滤Bean类 * */public class HelloService implements Service {    @Resource    private DataSource source;    //增加记录    public RetResult<HelloEntity> createHello(UserInfo info, HelloEntity entity) {        entity.setCreator(info == null ? 0 : info.getUserid()); //设置当前用户ID        entity.setCreatetime(System.currentTimeMillis());        source.insert(entity);        return new RetResult<>(entity);    }    //删除记录    public void deleteHello(int id) { //通过 /hello/delete/1234 删除对象        source.delete(HelloEntity.class, id);    }    //修改记录    public void updateHello(HelloEntity entity) { //通过 /hello/update?bean={...} 修改对象        entity.setUpdatetime(System.currentTimeMillis());        source.update(entity);    }    //修改记录    @RestMapping(name = "partupdate")  //不能使用updatepart,因为存在update,是updatepart的开头部分,不符合BasedHttpServlet的WebAction规则    public void updateHello(HelloEntity entity, @RestParam("cols") String[] columns) { //通过 /hello/update?bean={...} 修改对象        entity.setUpdatetime(System.currentTimeMillis());        source.updateColumns(entity, columns);    }        //查询Sheet列表    public Sheet<HelloEntity> queryHello(HelloBean bean, Flipper flipper) { //通过 /hello/query/start:0/size:20?bean={...} 查询Sheet列表        return source.querySheet(HelloEntity.class, flipper, bean);    }    //查询List列表    @RestMapping(name = "list")    public List<HelloEntity> queryHello(HelloBean bean) { //通过 /hello/list?bean={...} 查询List列表        return source.queryList(HelloEntity.class, bean);    }    //查询单个    @RestMapping(name = "find")    @RestMapping(name = "jsfind", jsvar = "varhello")    public HelloEntity findHello(@RestParam("#") int id) {  //通过 /hello/find/1234 查询对象        return source.find(HelloEntity.class, id);    }}                

        转换为RestHttpServlet如下:

@WebServlet(value = {"/hello/*"}, repair = true)public class _DynHelloRestServlet extends SimpleRestServlet {    @Resource    private HelloService _service;    @AuthIgnore    @WebAction(url = "/hello/create")    public void create(HttpRequest req, HttpResponse resp) throws IOException {        HelloEntity bean = req.getJsonParameter(HelloEntity.class, "bean");        UserInfo user = currentUser(req);        RetResult<HelloEntity> result = _service.createHello(user, bean);        sendRetResult(resp, result);    }    @AuthIgnore    @WebAction(url = "/hello/delete/")    public void delete(HttpRequest req, HttpResponse resp) throws IOException {        int id = Integer.parseInt(req.getRequstURILastPath());        _service.deleteHello(id);        sendRetResult(resp, RetResult.SUCCESS);    }    @AuthIgnore    @WebAction(url = "/hello/update")    public void update(HttpRequest req, HttpResponse resp) throws IOException {        HelloEntity bean = req.getJsonParameter(HelloEntity.class, "bean");        _service.updateHello(bean);        sendRetResult(resp, RetResult.SUCCESS);    }    @AuthIgnore    @WebAction(url = "/hello/partupdate")    public void partupdate(HttpRequest req, HttpResponse resp) throws IOException {        HelloEntity bean = req.getJsonParameter(HelloEntity.class, "bean");        String[] cols = req.getJsonParameter(String[].class, "cols");        _service.updateHello(bean, cols);        sendRetResult(resp, RetResult.SUCCESS);    }    @AuthIgnore    @WebAction(url = "/hello/query")    public void query(HttpRequest req, HttpResponse resp) throws IOException {        HelloBean bean = req.getJsonParameter(HelloBean.class, "bean");        Flipper flipper = findFlipper(req);        Sheet<HelloEntity> result = _service.queryHello(bean, flipper);        resp.finishJson(result);    }    @AuthIgnore    @WebAction(url = "/hello/list")    public void list(HttpRequest req, HttpResponse resp) throws IOException {        HelloBean bean = req.getJsonParameter(HelloBean.class, "bean");        List<HelloEntity> result = _service.queryHello(bean);        resp.finishJson(result);    }    @AuthIgnore    @WebAction(url = "/hello/find/")    public void find(HttpRequest req, HttpResponse resp) throws IOException {        int id = Integer.parseInt(req.getRequstURILastPath());        HelloEntity bean = _service.findHello(id);        resp.finishJson(bean);    }    @AuthIgnore    @WebAction(url = "/hello/jsfind/")    public void jsfind(HttpRequest req, HttpResponse resp) throws IOException {        int id = Integer.parseInt(req.getRequstURILastPath());        HelloEntity bean = _service.findHello(id);        sendJsResult(resp, "varhello", bean);    }}                

        REST插件让开发者省去了编写HttpServlet过程,让开发更加敏捷。

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