【标题】：又是乱码问题-Filter 配置也很重要
【关键字】：-Filter
【来源】：http://www.blogjava.net/rory/archive/2006/12/27/character_encoding_problem_filtermapping_position.html

又是乱码问题-Filter 配置也很重要

? 上周更新了一下myblog,添加了一个Filter，做统计访问用。可是后来发现出现乱码问题了。找了很久都没有找到问题。debug的时候看到 CharacterEncodingFilter确实是执行了。不过就是没有效果。执行之前是ISO-8859-1编码的，执行之后还是， CharacterEncodingFilter就没有起到作用。后来终于找到问题的原因了。原来是Filter配置先后顺序的原因。
?????? 刚开始的配置是这样的:

???? < filter-mapping >
???????? < filter-name > requestCounterFilter </ filter-name >
???????? < url-pattern > *.jhtml </ url-pattern >
???? </ filter-mapping >
??
???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > /dwr/* </ url-pattern >
???? </ filter-mapping >
????
???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > *.jhtml </ url-pattern >
???? </ filter-mapping >
????
???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > *.jsp </ url-pattern >
???? </ filter-mapping >

? 先经过那个统计的filter然后再经过编码的filter。这样的话编码的filter就不起作用了。只要吧编码的filter放到最前面就没有问题了。改成这样就好。

???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > /dwr/* </ url-pattern >
???? </ filter-mapping >
????
???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > *.jhtml </ url-pattern >
???? </ filter-mapping >
????
???? < filter-mapping >
???????? < filter-name > encodingFilter </ filter-name >
???????? < url-pattern > *.jsp </ url-pattern >
???? </ filter-mapping >
????
???? < filter-mapping >
???????? < filter-name > requestCounterFilter </ filter-name >
???????? < url-pattern > *.jhtml </ url-pattern >
???? </ filter-mapping >

以后大家一定要注意啊。顺序问题也是很重要的。
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