一、表单POST的数据的中文乱码解决
这类型的数据中文可以通过filters来实时过滤。filters代码如下：
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.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);}}
filters配置（配置web.xml）：
＜filter＞ ＜filter-name＞Set Character Encoding＜/filter-name＞ ＜filter-class＞filters.SetCharacterEncodingFilter＜/filter-class＞ ＜init-param＞ ＜param-name＞encoding＜/param-name＞ ＜param-value＞GBK＜/param-value＞ ＜/init-param＞＜/filter＞＜filter-mapping＞ ＜filter-name＞Set Character Encoding＜/filter-name＞ ＜url-pattern＞/*＜/url-pattern＞＜/filter-mapping＞
二、将中文数据存入数据库乱码问题
以mysql为例，改写连接字符串即可：
jdbc:mysql: // localhost: 3306 / workshopdb? useUnicode = true & characterEncoding = GBK三、 通过url传递参数和识别中文文件名问题
问题表现：１、通过url传递参数，例如：
http://localhost:81/crjy/admin/articlelist.jsp?levelId=64&levelName=学生党建 通过request.getParameter("levleName")得到的值为乱玛。２、识别中文文件名，例如：
< img src ="./pic/四川地图.jpg" > 图片不能显示。解决之道：
１、如果只想解决第一个问题那很简单，两句代码即可：
String role = request.getParameter( " chara " );role = new String(role.getBytes( " ISO-8859-1 " ), " GB2312 " );out.println(role);因为tomcat服务器默认用 ISO-8859-1 字符集的。但是这样只能解决第一个问题不能解决中文文件名问题
２、两个问题一起解决，修改server.xml，找到下列语句添加URIEncoding="GB18030"，这样两个问题就一起解决了（不需要role=new String(role.getBytes("ISO-8859-1"),"GB2312");转化，得到的参数即为正常的中文）
< Connector acceptCount ="100" connectionTimeout ="20000" debug ="0" disableUploadTimeout ="true" enableLookups ="false" maxSpareThreads ="75" maxThreads ="150" minSpareThreads ="25" port ="81" redirectPort ="8443" />