jsp字符过滤器的设置

 

本文介绍过滤器来设置字符编码的问题，通过编写一个servlet和配置web.xml来即可实现
 这样不必在每个jsp页面社自豪字符编码了，值需要在web.xml配置需要的编码即可。

web.xml配置内容如下：

 

<!-- 字符过滤器 -->
    <filter>
        <filter-name>encodeFilter</filter-name>
        <filter-class>
            test.servlet.CharacterEncodingFilter
        </filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
      </filter>

    <filter-mapping>
        <filter-name>encodeFilter</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>encodeFilter</filter-name>
        <url-pattern>*.do</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>encodeFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Filter内容如下：

 

package test.servlet;

import javax.servlet.*;
import java.io.IOException;

 

public class CharacterEncodingFilter implements Filter  {

 
 protected String encoding = "UTF-8";

    protected FilterConfig filterConfig = null;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
     }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // Conditionally select and set the character encoding to be used
        if (request.getCharacterEncoding() == null) {
            String encoding = selectEncoding(request);
            if (encoding != null) {
                request.setCharacterEncoding(encoding);
            }
        }
        // Pass control on to the next filter
        chain.doFilter(request, response);
    }

    protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }

    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }

}

 

 

转： 字符页面设置方式：

 

1. pageEncoding:<%@ page pageEncoding="UTF-8"%>

jsp页面编码: jsp文件本身的编码 

 

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

web页面显示编码:jsp的输出流在浏览器中显示的编码 

 

3. html页面charset:<META http-equiv="Content-Type" content="text/html; charset=UTF-8">

web页面输入编码: 输入框输入的字体编码   

 

4. setCharacterEncoding:request.setCharacterEncoding(),response.setCharacterEncoding()

web服务器输入的请求流: web Server相应浏览器的请求数据  

 

5 .setContentType:response.setContentType()

web服务器输出的响应流: web Server相应浏览器的输出数据 

 

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/XinVSYuan/archive/2009/02/05/3864853.aspx