docs：LDP框架filter修改说明文档。

开发文档/LDP框架filter添加前端标识说明.md

+# LDP 框架filter添加前端标识说明
+
+表：ldp_uaa_app_client添加字段front_app_id
+
+添加脚本：V1.1.7__alter_ldp_uaa_app_client.sql
+
+
+依赖包：
+    <dependency>
+        <groupId>com.sinra.ldp</groupId>
+        <artifactId>base-api</artifactId>
+        <version>${ldp.version}</version>
+    </dependency>
+ 
+```java
+    /**
+         *  service-uaa 添加接口 ，类：AppClientRest.java  根据frontAppId 获取信息
+         *
+         * @param frontAppId
+         * @return
+         */
+        @GetMapping("/getByFrontAppId")
+        public List<LdpUaaAppClient> getByFrontAppId(String frontAppId) {
+            List<LdpUaaAppClient> ldpUaaAppClient = appClientService.getByFrontAppId(StringUtils.EMPTY,frontAppId);
+            return ldpUaaAppClient;
+        }
+
+    // Sql 脚本：
+    <query id="select_app_client_list_by_frontappid" author="machao" remark="通过frontappid获取UAA客户端信息"  >
+    
+            <sql>
+                <![CDATA[
+                SELECT
+                    c.app_id,
+                    c.front_app_id,
+                    c.auth_realm
+                FROM
+                    ldp_uaa_app_client c
+                    JOIN ldp_uaa_auth_realm r ON c.auth_realm = r.id
+                WHERE
+                    c.status=1
+                AND c.del_flag=0
+                AND	c.front_app_id = :frontAppId #
+                ]]>
+		</sql>
+	</query>
+
+```
+  
+     
+```java
+    /**
+     *  使用地方 LoginForwordFilter.java    line 191 ~ 205
+     * @param tokenStr token字符
+     * @return
+     */
+	RouteApp getRouteApp(String frontappId) {
+            RouteApp routeApp = ldpUaaProperties.getRouteApps().
+                    stream().filter(appinfo -> (appinfo.getId() != null && frontappId.indexOf(appinfo.getId()) >= 0)).findFirst().get();
+            if (null == routeApp) {
+                ResponseEntity<Map> responseEntity = restTemplate.getForEntity("http://mcs-service/uaa/backend/client/getByFrontAppId?frontAppId=" + frontappId, Map.class);
+                System.out.println(responseEntity.getBody());
+                if (responseEntity.getStatusCode() == HttpStatus.OK
+                        && CommonConstants.SUCCESS.equals(responseEntity.getBody().get("code"))) {
+                    if (null != responseEntity.getBody().get("data")) {
+                        List list = (ArrayList) responseEntity.getBody().get("data");
+                        LinkedHashMap<String, String> map = (LinkedHashMap) list.get(0);
+                        routeApp.setId(map.get("frontAppId"));
+                        routeApp.setRealmcode(map.get("authRealm"));
+                        routeApp.setClientid(map.get("appId"));
+                    }
+                }
+            }
+            return routeApp;
+        }
+```
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