EncodingConversionFilter的实现

水狐 — Tue, 03 Jan 2006 17:09:00 GMT

1package filter.lepapillon.bbs;
2
3import java.io.IOException;
4
5import javax.servlet.FilterChain;
6import javax.servlet.FilterConfig;
7import javax.servlet.ServletException;
8import javax.servlet.ServletRequest;
9import javax.servlet.ServletResponse;
10import javax.servlet.http.HttpServletRequest;
11
12/**
13 * Servlet implementation class for Servlet: EncodingConvFilter
14 * 本程序是实现bbs中文字符集转换的过滤器
15 *
16 */
17/**
18 * @author 刘亭宇
19 *
20 */
21public class EncodingConvFilter implements javax.servlet.Filter {
22
23    /*
24     * 定义字符串encoding，也就是字符集
25     */
26    private String TargetEncoding = "UTF-8";
27
28    /*
29     * 定义filterConfig
30     */
31    private FilterConfig filterConfig = null;
32
33    /*
34     * 过滤器销毁方法
35     *
36     * @see javax.servlet.Servlet#destroy()
37     */
38    public void destroy() {
39        // EXE 过滤器销毁方法
40        this.filterConfig = null;
41
42    }
43
44    /*
45     * 字符集过滤器初始化方法、在doFilter()前初始化字符集
46     *
47     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
48     */
49    public void init(FilterConfig request) throws ServletException {
50        // EXE 字符集过滤器初始化方法、在doFilter()前初始化字符集
51        // 从web.xml配置文件中取得encoding的值；xml文件中的默认为：UTF-8
52        this.TargetEncoding = filterConfig.getInitParameter("encoding");
53
54    }
55
56    /*
57     * 过滤器方法、对字符集进行转换
58     *
59     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
60     *      javax.servlet.ServletResponse, javax.servlet.FilterChain)
61     */
62    public void doFilter(ServletRequest srequest, ServletResponse sresponse,
63            FilterChain chain) throws IOException, ServletException {
64        // EXE 过滤器方法、对字符集进行转换
65
66        // 将ServletRequest请求转换成HttpServletRequest
67        HttpServletRequest hsrequest = (HttpServletRequest) srequest;
68        hsrequest.setCharacterEncoding(TargetEncoding);
69        chain.doFilter(srequest, sresponse);
70    }
71}

web.xml配置

    <filter>
        <description>
        字符集过滤器description>
        <display-name>
        EncodingConvFilterdisplay-name>
        <filter-name>EncodingConvFilterfilter-name>
        <filter-class>
        filter.lepapillon.bbs.EncodingConvFilterfilter-class>
        <init-param>
            <description>
            字符集description>
            <param-name>encodingparam-name>
            <param-value>UTF-8param-value>
        init-param>
    filter>

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

水狐 2006-01-04 01:09 发表评论

BlogJava-破破烂烂的盘子-文章分类-Servlet 2.4

EncodingConversionFilter的实现