解决Tomcat 编码问题的Character Encoding 另类过滤器实现.
使用我写的这个Class，然后再Tomcat里配置一下，比在自己的Webapp里配置的过滤器还要方便，高效。
一行配置就搞定：
server.xml里增加下面的配置：
<Valve className="org.apache.catalina.valves.CharSetValve" encoding="GBK"/>
可以放到Engine, Host, 或者 Context 元素中：
例如：
<Context docBase="d:\lizongbo\mywebapp" path="/lizongbo"
privileged="true" antiResourceLocking="false" antiJARLocking="false">
<Valve className="org.apache.catalina.valves.CharSetValve" encoding="GBK"/>
</Context>
当然这个class不存在的，于是，下面是java代码，
把编译好的class放到 D:\jakarta-tomcat-5.5.7
\server\classes\org\apache\catalina\valves\下，就可以了。
java 代码：
package org.apache.catalina.valves;
import java.io.*;
import javax.servlet.*;
import org.apache.catalina.*;
import org.apache.catalina.connector.*;
import org.apache.catalina.util.*;
/**
* <p>Title: CharSetValve </p>
* <p>Description: a CharSet Filter for Tomcat Application</p>
* <p>Copyright: Apache License Version 2.0 </p>
* <p>Company: lizongbo</p>
* @author lizongbo @ gmail.com
* @version 1.0
*/
public class CharSetValve
extends ValveBase implements Lifecycle {
public CharSetValve() {
super();
}
protected LifecycleSupport lifecycle = new LifecycleSupport(this);
private StringManager sm =
StringManager.getManager(Constants.Package);
private boolean started = false;
private String encoding = System.setProperty("file.encoding", "GBK");
public String getEncoding() {
return encoding;
}
public void setEncoding(String encoding) {
this.encoding = encoding;
}
public void invoke(Request request, Response response) throws IOException,
ServletException {
request.getRequest().setCharacterEncoding(getEncoding());
getNext().invoke(request, response);
}
public void addLifecycleListener(LifecycleListener listener) {
lifecycle.addLifecycleListener(listener);
}
public LifecycleListener[] findLifecycleListeners() {
return lifecycle.findLifecycleListeners();
}
public void removeLifecycleListener(LifecycleListener listener) {
lifecycle.removeLifecycleListener(listener);
}
public void start() throws LifecycleException {
if (started) {
throw new LifecycleException
(sm.getString("accessLogValve.alreadyStarted"));
}
}
public void stop() throws LifecycleException {
if (!started) {
throw new LifecycleException
(sm.getString("accessLogValve.notStarted"));
}
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
started = false;
}
}
详情请参考：http://issues.apache.org/bugzilla/show_bug.cgi?id=32795
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/config/valve.html
对了,Tomcat的示例里：
D:\jakarta-tomcat-5.5.7\webapps\servlets-examples\WEB-INF\web.xml
里被日本人强制指定默认值为日文编码了，FT!!!!!!!!!!!!!!!!!!!!!!!!!!!
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>filters.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>EUC_JP</param-value>
</init-param>
</filter>