为什么这样编写的jsp文件还是出现乱码
代码
<%@ page language= "java " contentType= "text/html; charset=GBK "%>
<%
//request.setCharacterEncoding( "GBK ");
String contentId = request.getParameter( "contentId ");
%>
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=GBK ">
<title> Jsp Test </title>
</head>
<body>
<form method = "post " action= "ActionVerify.jsp ">
<table>
<tr>
<td>
<input name = "contentId " type = "text " value= " <%=contentId %> ">
</td>
<td>
<input name = "submit " type = "submit " value= "提交 ">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language= "java " contentType= "text/html; charset=GBK "%>
<%
//request.setCharacterEncoding( "GBK ");
%>
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=GBK ">
<title> Insert title here </title>
</head>
<body>
<form action= " ">
<table>
<tr>
<td>
<%=request.getParameter( "contentId ") %>
</td>
</tr>
</table>
</form>
</body>
</html>
我已经设置了编码方式为GBK，但是我设置了request.setCharacterEncoding( "GBK ");就可以正常显示， <%@ page language= "java " contentType= "text/html; charset=GBK "%> 不能起到当前页面全局作用的效果吗？
第一个为index.jsp第二个为Actionverify.jsp
[解决办法]
1、将所有jsp页面编码方式统一，(我设置的是 "GBK ",)然后在jsp页面中加两句话：
<%@ page contentType= "text/html;charset=GBK " language= "java " pageEncoding= "GBK " %>
<META http-equiv=Content-Type content= "text/html; charset=GBK ">
2、将tomcat安装目录下conf文件夹下的server.xml 里加入字符编码方式：URIEncoding= "GBK "
<Connector
port= "8080 " maxThreads= "150 " minSpareThreads= "25 " maxSpareThreads= "75 "
enableLookups= "false " redirectPort= "8443 " acceptCount= "100 "
debug= "0 " connectionTimeout= "20000 "
disableUploadTimeout= "true " URIEncoding= "GBK " />
3、设置编码转换过滤器，写一个设置字符的类，并在web.xml配置该文件。
一.filter类的代码 :
package com.yourpackage;
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;
/** *//**
* Example filter that sets the character encoding to be used in parsing the
* incoming request
* 字符集过滤器，解决Java中文问题，非常有效
*/
public class SetCharacterEncodingFilter implements Filter ...{
/** *//**
* Take this filter out of service.
*/
public void destroy() ...{
}
/** *//**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)throws IOException, ServletException ...{
request.setCharacterEncoding( "GB2312 ");
// 传递控制到下一个过滤器
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException ...{
}
}
二.web.xml里面的配置:
<filter>
<filter-name> Set Character Encoding </filter-name>
<filter-class> netstore.framework.util.SetCharacterEncodingFilter </filter-class>
</filter>
<filter-mapping>
<filter-name> Set Character Encoding </filter-name>
<url-pattern> /* </url-pattern>
</filter-mapping>
4、如果以上方法都不行，检查开发环境是否有问题，我之前就是因为用的eclipse+lomboz整合版导致中文乱码和一些jsp页面编译后会出现少 "\ "的错误，换成myeclipse就OK了！
[解决办法]
JSP就是会出现这种情况，还有像什么读数据库里的值它也回出先乱码，这很正常。
像你说的这个，其实 <%@ page language= "java " contentType= "text/html; charset=GBK "%>
确实是起全局作用，就是说整个页面的编码方式是GBK，但是对从别的页面传过来的值就可能不起作用。你必须再转换一次编码方式，一般这种情况只会出现在传中文的时候，你自己写的那是一种解决方法，还可以这样转换：(request.getParameter( "contentId ").getBytes( "ISO8859_1 "), "GBK ")
[解决办法]
<%=new String(request.getParameter( "contentId ").getBytes( "ISO-8859-1 "), "GBK ") %>
[解决办法]
<%=new String(request.getParameter( "contentId ").getBytes( "ISO-8859-1 "), "GBK ") %>
or
<%=new String(request.getParameter( "contentId ").getBytes( "ISO-8859-1 "), "gb2312 ") %>