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Problem of Query Chinese words in MySQL using Java (Servlet java)

 
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In my servlet, if I build in this sql inside ,
SELECT * FROM table WHERE location='Chinese word here'
It outputs nothing!
if i change the 'Chinese word here' to English,it have result!
But if I query in mysql, i can
If the 'Chinese word here' is get in a form, (ie 'Chinese word here' is got by req.getParameter but not built in), it can display result, why???
 
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