j2ee 字符集过滤

最新推荐文章于 2022-06-21 17:15:56 发布

原创最新推荐文章于 2022-06-21 17:15:56 发布 · 569 阅读

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文章标签：

#filter #javaee #character #servlet #string #web开发

以前，老师说JAVA的WEB开发，是一个面向配置文件的面向对象，当时听着不以为然。

现在感觉，那些配置文件设置的十分合理，有人说配置文件麻烦，不过目前虽然我感觉到了它的麻烦，但是面对它们还是比较有信心，至少感觉那些配置文件一个也不能缺！

下面是一个CharaterEncodingFilter，将JAVAEE的处理字符集ISO-8859-1转换为UTF-8.

//对客户端的所有请求进行，编码的转换。ISO-8859-1(latin-1)->utf-8
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;

public class CharacterEncodingFilter implements Filter{

    //过滤器配置
    protected FilterConfig filterConfig = null;
    protected String encodingName = null;
    protected boolean enable ;

    public CharacterEncodingFilter() {
        this.encodingName = "UTF-8";
        this.enable = false;
    }

    public void destroy() {
        // TODO Auto-generated method stub

    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        if(this.enable) {
            request.setCharacterEncoding(this.encodingName);
            System.out.println("set request character");
        }
        System.out.println("not enable");
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        this.filterConfig = filterConfig;
        loadConfigParams();
    }

    private void loadConfigParams() {
        this.encodingName = this.filterConfig.getInitParameter("encoding");
        String strIgnoreFlag = this.filterConfig.getInitParameter("enable");
        if(strIgnoreFlag.equalsIgnoreCase("true")) {
            System.out.println("enable = true");
            this.enable = true;
        }else {
            this.enable = false;
        }
    }

}

对配置文件的修改十分的重要，在WEB.xml中，加入如下：

<filter>
<display-name>CharacterEncodingFilter</display-name>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>CharacterEncodingFilter</filter-class>
<init-param>
   <description>编码方式</description>
   <param-name>encoding</param-name>
   <param-value>UTF-8</param-value>
</init-param>
<init-param>
   <description>是否使用</description>
   <param-name>enable</param-name>
   <param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>