JSP garbled summary and custom filter Encoding

1. Write a filter by yourself.

Charsetencodingfilter. Java

package filter;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class CharsetEncodingFilter implements Filter {private String encoding;public void destroy() {System.out.println("--------destroy---------");}public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {System.out.println("--------doFilter---------");arg0.setCharacterEncoding(encoding);arg2.doFilter(arg0,arg1);}public void init(FilterConfig arg0) throws ServletException {System.out.println("--------init---------");this.encoding = arg0.getInitParameter("encoding");System.out.println(encoding);}}

Web. xml configuration

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>    <filter><filter-name>CharsetEncodingFilter</filter-name><filter-class>filter.CharsetEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>CharsetEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>    <filter-mapping><filter-name>CharsetEncodingFilter</filter-name><url-pattern>/servlet/*</url-pattern></filter-mapping></web-app>

2. on the page

<%@ page contentType="text/html;charset=UTF-8" %><%request.setCharacterEncoding("UTF-8");%>

<%@ page contentType="text/html;charset=UTF-8"%>

<%response.setCharacterEncoding("UTF-8");%>

 

3. If a garbled like this occurs: % E4 % B8 % 8e % E6 % A8 % a1 % E5 % BC % 8f %

<%URLDecoder.decode(str,"UTF-8");%>

4. Manually convert Codes

String str = (String) request.getParameter("username");byte[] temp = str.getBytes("ISO-8859-1");str = new String(temp,"UTF-8");out.print(str);

5. Modify the default Tomcat encoding.

By default, Tomcat uses the encoding method of the iso8859-1
Modify the conf/server. xml file in Tomcat
Find the following code:
<Connector Port = "8080" protocol = "HTTP/1.1" connectiontimeout = "20000" redirectport = "8443"/>
This Code specifies the port number of Tomcat to listen to HTTP requests.
You can add an attribute here: uriencoding, which is set to a UTF-8 so Tomcat (default ISO-8859-1 encoding) can process get requests in UTF-8 encoding.
The changed code is as follows:
<Connector Port = "8080" uriencoding = "UTF-8" protocol = "HTTP/1.1" connectiontimeout = "20000" redirectport = "8443"/> In addition
You can also add the usebodyencodingforuri = "true" attribute to set the same encoding for post and get.
The changed code is as follows:
<Connector Port = "8080" usebodyencodingforuri = "true" uriencoding = "UTF-8" protocol = "HTTP/1.1" connectiontimeout = "20000" redirectport = "8443"/>

6. Pay attention to the location relationship between response. setcontenttype ("text/html; charset = UTF-8"); and printwriter out = response. getwriter,

Remember to put printwriter out = response. getwriter (); behind response. setcontenttype ("text/html; charset = UTF-8"); otherwise, the encoding will be invalid.

7. Others

Http://fiona777.iteye.com/blog/385934

Http://handonghandong.iteye.com/blog/758866

Http://gaobaolu.blog.edu.cn/2012/722247.html