常见的 Tomcat 5 表单编码提交后乱码的解决方案有很多, 有改 Tomcat Connector 属性的, 有加过滤器的. 但是 Tomcat 自带的那个过滤器只解决了 POST 方式的乱码却不能处理 GET 方式的乱码. 在这里那我就给出一个不需要修改任何 Tomcat 配置文件的完美解决中文问题的过滤器的代码: 首先是我们的测试页面: GET 方式: POST 方式: index.jsp <%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>表单测试页面</title> </head> <body> <form action="action.jsp"> GET 方式: <input type=text name="name" value="GET 中文"> <input type=submit> </form> <form action="action.jsp" method="POST"> POST 方式: <input type=text name="name" value="POST 中文"> <input type=submit> </form> </body> </html> 和普通的表单没有任何区别. 然后就是表单提交页面 action.jsp: <%@ page language="java" pageEncoding="GBK"%> <html> <body> 参数: <%=request.getParameter("name") %> <br> </body> </html> 接着是过滤器的配置文件 web.xml (用 2.5 版本也可以): <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <filter> <filter-name>TomcatFormFilter</filter-name> <filter-class>filters.TomcatFormFilter</filter-class> </filter> <filter-mapping> <filter-name>TomcatFormFilter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> 最后最关键的就是我们的过滤器代码了, 对 GET 方式使用请求包装器, 而 POST 方式则用 setCharacterEncoding(): package filters; 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.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; import javax.servlet.http.HttpServletResponse; public class TomcatFormFilter implements Filter { /** * Request.java * 对 HttpServletRequestWrapper 进行扩充, 不影响原来的功能并能提供所有的 HttpServletRequest * 接口中的功能. 它可以统一的对 Tomcat 默认设置下的中文问题进行解决而只需要用新的 Request 对象替换页面中的 * request 对象即可. */ class Request extends HttpServletRequestWrapper { public Request(HttpServletRequest request) { super(request); } /** * 转换由表单读取的数据的内码. * 从 ISO 字符转到 GBK. */ public String toChi(String input) { try { byte[] bytes = input.getBytes("ISO8859-1"); return new String(bytes, "GBK"); } catch (Exception ex) { } return null; } /** * Return the HttpServletRequest holded by this object. */ private HttpServletRequest getHttpServletRequest() { return (HttpServletRequest)super.getRequest(); } /** * 读取参数 -- 修正了中文问题. */ public String getParameter(String name) { return toChi(getHttpServletRequest().getParameter(name)); } /** * 读取参数列表 - 修正了中文问题. */ public String[] getParameterValues(String name) { String values[] = getHttpServletRequest().getParameterValues(name); if (values != null) { for (int i = 0; i < values.length; i++) { values[i] = toChi(values[i]); } } return values; } } public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpreq = (HttpServletRequest)request; if(httpreq.getMethod().equals("POST")) { request.setCharacterEncoding("GBK"); } else { request = new Request(httpreq); } chain.doFilter(request, response); } public void init(FilterConfig filterConfig) throws ServletException { } }
