利用filter过滤器将字符编码转变为utf-8。
过滤器位置
1.新建EncodingFilter.java文件
package encoding;
import java.io.*;
import javax.servlet.*;
public class EncodingFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
try {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
} catch (Exception e) {
}
chain.doFilter(request, response);
}
public void destroy() {
}
}
2.修改web.xml文件（如果没有就自己新建一个）
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<filter>
<display-name>encoding</display-name>
<filter-name>encoding</filter-name>
<filter-class>encoding.EncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
