有时候web项目莫名的乱码问题很令人头疼,很好的一种解决方式就是用过滤器对WEB应用的HTTP请求响应做相应的编码处理。
CharsetFilter.java
package com.filter;
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.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CharsetFilter implements Filter{
private FilterConfig config;
//初始化配置参数
private static final String INIT_PARAM_ENCODE="encode";
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
String encode = config.getInitParameter(INIT_PARAM_ENCODE);
if(encode != null && !encode.isEmpty())
{
req.setCharacterEncoding(encode);
}
chain.doFilter(request, response);
if(encode != null && !encode.isEmpty())
{
resp.setCharacterEncoding(encode);
}
}
//初始化方法
@Override
public void init(FilterConfig config) throws ServletException {
this.config = config;
}
}
web.xml配置:url-pattern路径下的所有jsp都将经过过滤。
<filter>
<filter-name>CharsetFilter</filter-name>
<filter-class>com.filter.CharsetFilter</filter-class>
<init-param>
<param-name>encode</param-name>
<param-value>GBK</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharsetFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>