示例：使用详细参数发布服务

有时，您可能希望在初次发布服务时对服务属性进行精细控制。可以通过使用 JavaScript 对象表示法 (JSON) 在文本文件中列出服务参数来实现此操作。然后，调用 ArcGIS REST API 中的 createService 方法并传入从文件读取的 JSON。

对于地图服务，必须在 JSON 中指定地图服务定义 (MSD) 文件。此文件以 ArcGIS Server 能够理解和绘制的格式合成您的 ArcMap 文档 (MXD) 的信息。在继续创建服务之前，必须使用 arcpy.mapping 模块分析地图并创建 MSD。本部分要求计算机具有 ArcGIS Desktop 许可。其他服务类型不要求使用 arcpy.mapping 或创建 MSD。

以下为可能的 JSON 文件示例。有关如何为不同服务类型创建 JSON 文件的详细示例，请参阅 ArcGIS REST API 参考。

{  "serviceName": "Beirut",  "type": "MapServer",  "description": "Service showing Beirut parcels and streets.",  "capabilities": "Map,Query,Data",  "clusterName": "default",  "minInstancesPerNode": 1,  "maxInstancesPerNode": 3,  "instancesPerContainer": 1,  "maxWaitTime": 60,  "maxStartupTime": 300,  "maxIdleTime": 1800,  "maxUsageTime": 600,  "loadBalancing": "ROUND_ROBIN",  "isolationLevel": "HIGH",  "configuredState": "STARTED",  "recycleInterval": 24,  "recycleStartTime": "00:00",  "keepAliveInterval": 1800,  "private": false,  "isDefault": false,  "properties": {    "maxBufferCount": "100",    "maxImageHeight": "2048",    "maxRecordCount": "1000",    "filePath": "c:\\data\\Beirut\\Beirut_Parcels.msd",    "maxImageWidth": "2048",    "enableDynamicLayers": "false",    "cacheOnDemand": "false",    "dynamicDataWorkspaces": "",    "useLocalCacheDir": "true",    "outputDir": "c:\\arcgisserver\\directories\\arcgisoutput",    "virtualOutputDir": "/rest/directories/arcgisoutput",    "supportedImageReturnTypes": "URL",    "isCached": "false",    "ignoreCache": "false",    "clientCachingAllowed": "true",    "cacheDir": ""  },  "extensions": [],  "datasets": []}

以下代码显示了发布服务时如何在 Python 脚本中引用此 JSON 文件的内容。

# Demonstrates how to publish a service from a JSON definition file
# An MSD file is required, which is made from the MXD in this script

# For Http calls
import httplib, urllib, json, arcpy, os

# For system tools
import sys

# For reading passwords without echoing
import getpass


# Defines the entry point into the script

def main(argv=None):
    # Print some info
    print
    print "This tool is a sample script that publishes a service using an MXD and JSON definiton."
    print
    
    # Ask for admin/publisher user name and password
    username = raw_input("Enter user name: ")
    password = getpass.getpass("Enter password: ")

    # Ask for other necessary information
    serverName = raw_input("Enter Server name: ")
    serverPort = 6080
    mxdPath = raw_input("Enter the path to the MXD: ")
    msdPath = raw_input("Enter the desired path for the MSD: ")
    jsonPath = raw_input("Enter the path to the JSON file: ")

    # Analyze MXD and create MSD file
    if not os.path.isfile(mxdPath):
        return

    if mxdPath.endswith('.mxd'):
        mapErrors = analyzeMap(mxdPath)
        if len(mapErrors) > 0:
            print "Fix map errors before converting to mxd"
            return
        mxd = arcpy.mapping.MapDocument(mxdPath)
        convertMap(mxd, msdPath);
        del mxd  
    else:
        print "Invalid file type submitted"
        return

    # Get a token
    token = getToken(username, password, serverName, serverPort)
    if token == "":
        print "Could not generate a token with the username and password provided."
        return

    # Read the JSON file for the service
    serviceJSON = open(jsonPath).read()
    
    # Construct URL to create a service
    # If publishing to a folder, invoke createService on the folder URL
    createServiceURL = "/arcgis/admin/services/createService"
    
    # This request needs the token, the JSON defining the service properties,
    #  and the response format 
    params = urllib.urlencode({'token': token, 'service':serviceJSON, 'f': 'json'})
    
    headers = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}
    
    # Connect to URL and post parameters    
    httpConn = httplib.HTTPConnection(serverName, serverPort)
    httpConn.request("POST", createServiceURL, params, headers)
    
    # Read response
    response = httpConn.getresponse()
    if (response.status != 200):
        httpConn.close()
        print "Error while creating the service."
        return
    else:
        data = response.read()
        httpConn.close()
        
        # Check that data returned is not an error object
        if not assertJsonSuccess(data):          
            print "Error returned by operation. " + data
        else:
            print "Operation completed successfully!"
        
        return

# A function to analyze a map document
def analyzeMap(mapPath):
    mxd = arcpy.mapping.MapDocument(mapPath)
    analysis = arcpy.mapping.AnalyzeForMSD(mxd)

    vars = analysis['errors']
    for ((message, code), layerlist) in vars.iteritems():
      print "Errors: "
      print message, " (CODE %i)" % code
      print "       applies to the following layers:",
      for layer in layerlist:
          print layer.name,
      print
        
    del mxd
    return analysis['errors']

# A function to convert a map document to a map service definition (MSD)
def convertMap(mxd, msd):
    arcpy.mapping.ConvertToMSD(mxd, msd, "USE_ACTIVE_VIEW", "NORMAL", "NORMAL")
    del mxd, msd

# A function to generate a token given username, password and the adminURL.
def getToken(username, password, serverName, serverPort):
    # Token URL is typically http://server[:port]/arcgis/admin/generateToken
    tokenURL = "/arcgis/admin/generateToken"
    
    # URL-encode the token parameters
    params = urllib.urlencode({'username': username, 'password': password, 'client': 'requestip', 'f': 'json'})
    
    headers = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}
    
    # Connect to URL and post parameters
    httpConn = httplib.HTTPConnection(serverName, serverPort)
    httpConn.request("POST", tokenURL, params, headers)
    
    # Read response
    response = httpConn.getresponse()
    if (response.status != 200):
        httpConn.close()
        print "Error while fetching tokens from admin URL. Please check the URL and try again."
        return
    else:
        data = response.read()
        httpConn.close()
        
        # Check that data returned is not an error object
        if not assertJsonSuccess(data):            
            return
        
        # Extract the token from it
        token = json.loads(data)        
        return token['token']            
        

# A function that checks that the input JSON object 
#  is not an error object.
    
def assertJsonSuccess(data):
    obj = json.loads(data)
    if 'status' in obj and obj['status'] == "error":
        print "Error: JSON object returns an error. " + str(obj)
        return False
    else:
        return True
    
        
# Script start
if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))