Posted on 2007-10-09 13:29
J2EE ＵＰ ＵＰ 閱讀(108)
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常見的 Tomcat 5 表單編碼提交后亂碼的解決方案有很多, 有改 Tomcat Connector 屬性的, 有加過濾器的. 但是 Tomcat 自帶的那個過濾器只解決了 POST 方式的亂碼卻不能處理 GET 方式的亂碼. 在這里那我就給出一個不需要修改任何 Tomcat 配置文件的完美解決中文問題的過濾器的代碼:
首先是我們的測試頁面:
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>表單測試頁面</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>
和普通的表單沒有任何區別.
然后就是表單提交頁面 action.jsp:
<%@ page language="java" pageEncoding="GBK"%>
<html>
<body>
參數: <%=request.getParameter("name") %> <br>
</body>
</html>接著是過濾器的配置文件 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>最后最關鍵的就是我們的過濾器代碼了, 對 GET 方式使用請求包裝器, 而 POST 方式則用 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
* 對 HttpServletRequestWrapper 進行擴充, 不影響原來的功能并能提供所有的 HttpServletRequest
* 接口中的功能. 它可以統一的對 Tomcat 默認設置下的中文問題進行解決而只需要用新的 Request 對象替換頁面中的
* request 對象即可.
*/
class Request extends HttpServletRequestWrapper
{
public Request(HttpServletRequest request) {
super(request);
}
/**
* 轉換由表單讀取的數據的內碼.
* 從 ISO 字符轉到 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();
}
/**
* 讀取參數 -- 修正了中文問題.
*/
public String getParameter(String name)
{
return toChi(getHttpServletRequest().getParameter(name));
}
/**
* 讀取參數列表 - 修正了中文問題.
*/
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 {
}
}
怎么樣, 是不是很簡單也很方便呢?
文章來源:
http://www.aygfsteel.com/beansoft/archive/2007/10/09/151368.html