乱玛问题

最新推荐文章于 2024-12-05 18:18:57 发布

yu__yfchun125

最新推荐文章于 2024-12-05 18:18:57 发布

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CC 4.0 BY-SA版权

文章标签： encoding import null filter string character

本文链接：https://blog.youkuaiyun.com/yu__yfchun125/article/details/1724218

本文介绍了一种通过自定义过滤器SetCharacterEncodingFilter来解决JSP页面乱码的方法，并详细展示了如何设置字符编码及在web.xml文件中的配置步骤。

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为保证jsp不出现乱玛问题Fiter可以这样写，供参考
SetCharacterEncodingFilter.java

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.UnavailableException;

public class SetCharacterEncodingFilter implements Filter {
protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;

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

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException,
ServletException {

// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null) {
request.setCharacterEncoding(encoding);
}
}

// Pass control on to the next filter
chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null) {
this.ignore = true;
} else if (value.equalsIgnoreCase("true")) {
this.ignore = true;
} else if (value.equalsIgnoreCase("yes")) {
this.ignore = true;
} else {
this.ignore = false;
}

}

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

}

然后在在web.xml中配置下
<web-app>
<filter>
<filter-name>setCharacterEncodingFilter</filter-name>
<display-name>setCharacterEncodingFilter</display-name>
<description>setCharacterEncodingFilter</description>
<filter-class>SetCharacterEncodingFilter类的路径</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setCharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
...
</web-app>