JSP Character Interceptor __jdbc

Many in the learning JSP encountered garbled problem, the solution is actually very simple, a custom character interceptor can be.

In order to be decoupled from the business code, we should separate the character conversion code into a character interceptor.

Directly on the code:

Package com.jdbc.filter;
Import java.io.IOException;
Import Javax.servlet.Filter;
Import Javax.servlet.FilterChain;
Import Javax.servlet.FilterConfig;
Import javax.servlet.ServletException;
Import Javax.servlet.ServletRequest;
Import Javax.servlet.ServletResponse;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
	
	public class Characterfilter implements Filter {private filterconfig config; public void Dofilter (ServletRequest req, Servletresponse resp, Filterchain chain) throws IOException, Servletexception
		{HttpServletRequest request = (httpservletrequest) req;
		HttpServletResponse response = (httpservletresponse) resp;
		Gets the param-value String encoding = config.getinitparameter ("encoding") in the corresponding init-param in the encoding from the Web.xml file; If you define a variable, you must judge whether it is empty, or you will report a null pointer exception if (encoding!= null) {//Specify the character encoding set of the content request format Response.setcontenttype ("text/html; charse
			t= "+ encoding);
			When requested, the canonical character encoding format request.setcharacterencoding (encoding); //Indicates the output of the format character encoding set response.setcharacterencoding (encoding);
	}//Enter the next interceptor Chain.dofilter (request, response);
	}//Filterconfig is the interceptor's global variable public void init (Filterconfig config) throws servletexception {this.config = config; public void Destroy () {}}

The next step is to have the request go into the character interceptor and configure it in the Web.xml file

<!--character encoding set interceptor-->
  <filter>
      <filter-name>CharacterFilter</filter-name>
      < Filter-class>com.jdbc.filter.characterfilter</filter-class>
      <!--configuration initialization parameters-->
      < init-param>
          <param-name>encoding</param-name>
          <param-value>utf-8</param-value >
      </init-param>
  </filter>
  <!--mapping path-->
  <filter-mapping>
      < filter-name>characterfilter</filter-name>
      <url-pattern>/*</url-pattern>
  </ Filter-mapping>  

The above is the character interceptor, independent of the business code, only need to copy to the project.

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