javafilter过滤器在项目开发中的应用

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1、过滤器在项目开发中的应用javaee过滤器在项目怒开发中通常有三种应用：应用一：统一项目的字符编码：我们新建一个名为Encode.java的文件，内容是:packagefilter;importjava.io•IOException;importjavax.servlet•Filter;importjavax•servlet•FilterChain;importjavax.servlet•FilterConfig;importjavax.servlet•ServletException;importjavax.servlet•ServletR

2、equest;importjavax•servlet•ServletResponse;publicclassEncodeimplementsFilter{publicvoiddestroy(){//TODOAuto-germ吕tedmethodstubpublicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,FilterChainchain)throwsIOException,ServletException{request•setCharacterEncoding(nu

3、tf-8n);response•setCharacterEncoding(lfutf-8,f);chain.doFilter(requesresponse);publicvoidinit(FilterConfigargO)throwsServletException{//TODOAuto-generatedmethodstub}}程序在dofilter的方法中设置了request和response的编码为utf-8,这样便可以解决开发屮的乱码问题，配置文件web.xml这样写：encoding

4、lter-name>filter•Encodeencoding/*

5、an.dateSjavabean.mysql.loginjavabean.partpages"屈login■JavaEE5Libraries味Referen匚edLibraries业JRESystemLibrary[jdkl.7.0]▲年WebRoot[&META-INF▲齡pagesaccounterI•&css&images&picture(>usermanagej*a匚匚ounterindex.jspbossindex.jsp/error.jspj"login.jsp『loginerrorjspj"saleindex.jsp&pictu

6、re▲&WEB-INFDlib吋web.xml所有的页面文件都在pages的文件夹下（包括第一个登陆页面）。先建一个Unlogin,java,内容为：packagefilter;〃防止未登录访问页面的过滤器importjava.io」OException;importjavax.servlet.Filter;importjavax.servlet.FilterChain;importjavax.servlet.FilterConfig;importjavax.servlet.RequestDispatcher;importjavax.serv

7、let.ServletException;importjavax.servlet.ServletRequest;importjavax.servlet.ServletResponse;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;publicclassUnloginimplementsFilter{publicvoiddestroy(){/

8、/TODOAuto-generatedmethodstub}publicvoiddoFilter(ServletRequestrequest,ServletResp