6.2. 使用MapServer作为WFS客户端¶
WFS可以作为图层添加到MapServer中。通过这种方式，它被用作WFS客户端。
由于WFS需要通过网络传输数据，因此最好使用较少的数据量，此处的选择是使用点要素数据。
6.2.1. MapFile的写入方式¶
1MAP
2 IMAGETYPE "PNG"
3 EXTENT -180 -90 180 90
4 SIZE 600 300
5 SHAPEPATH "/gdata"
6 IMAGECOLOR 100 100 100
7 WEB
8 IMAGEPATH "/owg/ms_tmp/"
9 IMAGEURL "/ms_tmp/"
10 METADATA
11 "wfs_title" "world country"
12 "wfs_onlineresource" "http://webgis.cn/cgi-bin/mapserv?map=/owg/mft6.map"
13 "wfs_srs" "EPSG:4326"
14 "wfs_abstract" "This text describes your wfs service"
15 "wfs_enable_request" "*"
16 "wms_enable_request" "*"
17 "ows_keywordlist" "world"
18 "gml_include_items" "all"
19 END
20 END
21 PROJECTION
22 "init=epsg:4326"
23 END
24 SYMBOL
25 NAME "circle"
26 TYPE ELLIPSE
27 FILLED TRUE
28 POINTS
29 10 10
30 END
31 END
32 LAYER
33 NAME "wcity_wfs"
34 TYPE POINT
35 OFFSITE 0 0 0
36 STATUS ON
37 CONNECTIONTYPE WFS
38 CONNECTION "http://webgis.cn/cgi-bin/mapserv?map=/owg/mft2.map&"
39 METADATA
40 "wfs_version" "1.0.0"
41 "wfs_srs" "EPSG:4326"
42 "wfs_typename" "world-city"
43 "wfs_request_method" "GET"
44 "wfs_connectiontimeout" "60"
45 END
46 PROJECTION
47 "init=epsg:4326"
48 END
49 CLASS
50 NAME "cities"
51 SYMBOL "circle"
52 SIZE 6
53 COLOR 255 255 0
54 END
55 END
56 LAYER
57 NAME "wcountry"
58 DATA "wcountry.shp"
59 STATUS OFF
60 TYPE POLYGON
61 CLASS
62 NAME "The Upper Great Lakes States"
63 STYLE
64 COLOR 232 232 232
65 OUTLINECOLOR 32 32 32
66 END
67 END
68 END
69END
6.2.2. 范例效果¶
其效果是：
请注意，上图是传统的MapServer生成的地图。由前面的WFS点层定义，因此它主要被多边形遮挡。