LuaXML的安装及使用
本文介绍一下openresty中LuaXML的安装及使用
1. LuaXML
我们可以到LuaXML官网下载对应的lua模块
# mkdir luaxml-inst && cd luaxml-inst # git clone https://github.com/LuaDist/luaxml.git
1.1 编译LuaXML
首先修改编译脚本Makefile:
# 2009-03-16 by gf
# generic compiler and linker settings:
CC = gcc
INCDIR = -I/usr/local/openresty/luajit/include/luajit-2.1
LIB =
LIBDIR = -L. -L/usr/local/openresty/luajit/lib
CFLAGS = -Os -Wall -c #-g
# generic platform specific rules:
ARCH = $(shell uname -s)
ifeq ($(ARCH),Linux)
CFLAGS += -fPIC
LFLAGS = -fPIC -shared
LIBS = $(LIBDIR) $(LIB) -lluajit-5.1 -ldl
EXESUFFIX =
SHLIBSUFFIX = .so
else
ifeq ($(ARCH),Darwin) # MacOSX
LFLAGS = -bundle
LIBS = $(LIBDIR) -L/usr/local/lib $(LIB) -lluajit-5.1
EXESUFFIX = .app
SHLIBSUFFIX = .so
else # windows, MinGW
LFLAGS = -shared
LIBS = $(LIBDIR) $(LIB) -llua51 -mconsole -s
EXESUFFIX = .exe
SHLIBSUFFIX = .dll
endif
endif
# project specific targets:
all: LuaXML_lib$(SHLIBSUFFIX)
# project specific link rules:
LuaXML_lib$(SHLIBSUFFIX): LuaXML_lib.o
$(CC) -o $@ $(LFLAGS) $^ $(LIBS)
# project specific dependencies:
LuaXML_lib.o: LuaXML_lib.c
# generic rules and targets:
.c.o:
$(CC) $(CFLAGS) $(INCDIR) -c $<
clean:
rm -f *.o *~ LuaXML_lib.so LuaXML_lib.dll所修改的地方主要有如下：
INCDIR = -I/usr/local/openresty/luajit/include/luajit-2.1 LIBDIR = -L. -L/usr/local/openresty/luajit/lib LIBS = $(LIBDIR) $(LIB) -lluajit-5.1 -ldl LIBS = $(LIBDIR) -L/usr/local/lib $(LIB) -lluajit-5.1 LIBS = $(LIBDIR) $(LIB) -llua51 -mconsole -s
执行如下命令进行编译：
# make clean && make
接着将编译出来的LuaXML_lib.so与LuaXML.lua拷贝到openresty的lualib目录：
# cp LuaXML_lib.so /usr/local/openresty/lualib/ # cp LuaXML.lua /usr/local/openresty/lualib/
1.2 测试验证
1） 测试示例1
require("LuaXML")
xml = require("xml")
local function parse_xml_1()
local xmldata = [[
<?xml version="1.0" encoding="UTF-8"?>
<AccessControlPolicy xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<Owner>
<ID>test_user</ID>
<DisplayName>app_test_user</DisplayName>
</Owner>
<AccessControlList>
<Grant>
<Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Group">
<URI>http://acs.amazonaws.com/groups/global/AllUsers</URI>
</Grantee>
<Permission>READ</Permission>
</Grant>
<Grant>
<Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CanonicalUser">
<ID>test_user</ID>
<DisplayName>app_test_user</DisplayName>
</Grantee>
<Permission>FULL_CONTROL</Permission>
</Grant>
</AccessControlList>
</AccessControlPolicy>
]]
local xres = xml.eval(xmldata)
if not xres then
ngx.status = ngx.HTTP_INTERNAL_SERVER_ERROR
ngx.say("parse xml failure:", errmsg)
ngx.exit(ngx.HTTP_OK)
return
end
ngx.say("parse xml success")
local xowner = xres:find("Owner")
local xacl = xres:find("AccessControlList")
if xowner then
local xusrid = xowner:find("ID")
local xdisplayname = xowner:find("DisplayName")
if xusrid and xdisplayname then
ngx.say("user_id: ", xusrid[1], " displayname:", xdisplayname[1])
end
end
if xacl then
local xgrant0 = xacl[1]
local xgrant1 = xacl[2]
if xgrant0 and xgrant1 then
ngx.say("uri: ", xgrant0[1][1][1], " permission:", xgrant0[2][1])
ngx.say("uri: ", xgrant1[1][1][1], " permission:", xgrant1[2][1])
end
end
ngx.exit(ngx.HTTP_OK)
return
end 
注： 如果在开头不加如下
xml = require("xml")
而直接使用xml的话，则第二次请求会报错
attempt to index global 'xml'(a nil value)
2) 测试示例2
require("LuaXML")
xml = require("xml")
local function parse_xml_1()
local xmldata = [[
<?xml version="1.0" encoding="GB2312"?>
<computer>
<id value="1" name="thinkpad">
<size>17</size>
<height>250</height>
<factory name="xxxx"/>
</id>
<id value="2" name="thinkpad">
<size>12</size>
<height>150</height>
</id>
<id value="3" name="thinkpad">
<size>14</size>
<height>200</height>
</id>
</computer>
]]
local xfile = xml.load(filePath)
--xfile[0]对应的就是"computer"
print(xfile[1][0], xfile[1]["value"], xfile[1]["name"]) -- id 1 thinkpad
print(xfile[1][1][0], xfile[1][1][1]) -- size 17
print(xfile[1][2][0], xfile[1][2][1]) -- height 250
end
参看:
