Java replace issues with apostrophe single quote and backslash together

Question

I seem to be having issues  I have a query string that has values that can contain single quotes  This will break the query string  So I was trying to do a replace to change   to      Here is a sample code    This is  it  replace               The output for this is still    This is  it     It thinks I am just doing an escape character for the quote   So I tried these two pieces of code    This is  it  replace                     for the backslash  and a   char  This is  it  replace                     for the backslash  and    for the   char   Both of the above STILL results in the same output    This is  it    I can only seem to get this to actually spit out a slash with    This is  it  replace                  Which results in    This is    it    Any suggestions  I just want to replace a   with      It doesn t seem like it should be that difficult

User · Answer

I have used a trick to handle the apostrophe special character  When replacing   for    you need to place four backslashes before the apostrophe   str replaceAll

User · Answer

Example    String teste      Bauru      teste   teste replaceAll              JOptionPane showMessageDialog null teste

User · Answer

First of all  if you are trying to encode apostophes for querystrings  they need to be URLEncoded  not escaped with a leading backslash  For that use URLEncoder encode String  String   BTW  the second argument should always be  UTF-8    Secondly  if you want to replace all instances of apostophe with backslash apostrophe  you must escape the backslash in your string expression with a leading backslash  Like this    This is  it  replace                Edit   I see now that you are probably trying to dynamically build a SQL statement  Do not do it this way  Your code will be susceptible to SQL injection attacks  Instead use a PreparedStatement

User · Answer

Use  This is  it  replace

User · Answer

I have used   str replace             to replace the single quote in my string  Its working fine for me

User · Answer

If you want to use it in JavaScript then you can use  str replace  SP     SP      But in Java  str replaceAll  SP     SP      will work perfectly   SP  special character  Otherwise you can use Apache s EscapeUtil  It will solve your problem

User · Answer

Remember that stringToEdit replaceAll String  String  returns the result string  It doesn t modify stringToEdit because Strings are immutable in Java  To get any change to stick  you should use  stringToEdit   stringToEdit replaceAll

[java] Java replace issues with ' (apostrophe/single quote) and \ (backslash) together

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