JSP读取内容乱码问题

Jsp: <%@ page contentType="text/html;charset=gb2312"%>
改红字部分看看，一般乱码都是因为读不出中文造成的.

后台打印下看看是不是乱码；如果不是的话，问题就出在JSP上了，把JSP的编码改成UTF-8的。

JSP页面编码改成UTF-8;还不可以你就在WEB.XML里配置过滤器filter！过滤器的编码也设为UTF-8

JSP页面默认是UTF-8的
这样改下也不行。

乱码问题要分析是哪个环节产生的，所以，采用的架构比较重要，要说清楚。
如果是单纯的jsp+mysql，get提交的话，修改server.xml URIEncoding=UTF-8

你的JSP文件保存的时候要选择保存为UTF-8的形势，而不是ASCA码的形势，

一般情况下，如果不是数据库编码的问题，在web.xml中添加一个过滤器就可以解决了
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB18030</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

按我说的去检查
1.检查数据库建库的时候所选语言是否是utf-8
2.检查jsp头是否是<%@ page contentType="text/html;charset=utf-8"%>
3.检查jsp的html头中的<meta标签是否为
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
4.增加过滤器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;
/**
* Example filter that sets the character encoding to be used in parsing the
* incoming request, either unconditionally or only if the client did not
* specify a character encoding. Configuration of this filter is based on
* the following initialization parameters:
* <ul>
* <li>encoding - The character encoding to be configured
* for this request, either conditionally or unconditionally based on
* the <code>ignore</code> initialization parameter. This parameter
* is required, so there is no default.</li>
* <li>ignore - If set to "true", any character encoding
* specified by the client is ignored, and the value returned by the
* <code>selectEncoding()</code> method is set. If set to "false,
* <code>selectEncoding()</code> is called only if the
* client has not already specified an encoding. By default, this
* parameter is set to "true".</li>
* </ul>
*
* Although this filter can be used unchanged, it is also easy to
* subclass it and make the <code>selectEncoding()</code> method more
* intelligent about what encoding to choose, based on characteristics of
* the incoming request (such as the values of the <code>Accept-Language</code>
* and <code>User-Agent</code> headers, or a value stashed in the current
* user's session.
*
* @author Craig McClanahan
* @version $Id: SetCharacterEncodingFilter.java 939521 2010-04-30 00:16:33Z kkolinko $
*/public class SetCharacterEncodingFilter implements Filter {
 // ----------------------------------------------------- Instance Variables
 /**
 * The default character encoding to set for requests that pass through
 * this filter.
 */
 protected String encoding = null;
 /**
 * The filter configuration object we are associated with. If this value
 * is null, this filter instance is not currently configured.
 */
 protected FilterConfig filterConfig = null;
 /**
 * Should a character encoding specified by the client be ignored?
 */
 protected boolean ignore = true;
 // --------------------------------------------------------- Public Methods
 /**
 * Take this filter out of service.
 */
 public void destroy() { this.encoding = null;
 this.filterConfig = null; }
 /**
 * Select and set (if specified) the character encoding to be used to
 * interpret request parameters for this request.
 *
 * @param request The servlet request we are processing
 * @param result The servlet response we are creating
 * @param chain The filter chain we are processing
 *
 * @exception IOException if an input/output error occurs
 * @exception ServletException if a servlet error occurs
 */
 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); }
 /**
 * Place this filter into service.
 *
 * @param filterConfig The filter configuration object
 */
 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 Methods
 /**
 * Select an appropriate character encoding to be used, based on the
 * characteristics of the current request and/or filter initialization
 * parameters. If no character encoding should be set, return
 * <code>null</code>.
 * 
 * The default implementation unconditionally returns the value configured
 * by the encoding initialization parameter for this
 * filter.
 *
 * @param request The servlet request we are processing
 */
 protected String selectEncoding(ServletRequest request) { return (this.encoding); }}以及配置文件
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 
 <filter>
 <filter-name>Set Character Encoding</filter-name>
 <filter-class>filters.SetCharacterEncodingFilter</filter-class>
 <init-param>
 <param-name>encoding</param-name>
 <param-value>utf-8</param-value>
 </init-param>
 </filter>
 <filter-mapping>
 <filter-name>Set Character Encoding</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping></web-app>

还有第5点：保存的时候，jsp文件存为utf-8格式。
查看方法：以eclipse为例，点击jsp文件，然后右键属性，里面有，默认为ms932，选择others，里面有utf-8可以选

前几天我也遇到这个问题了，注意，你更改为utf-8或者GBK后，重启mysql后，要把原来建的数据库删掉，然后重新建一个数据库使用，因为你做的更改，不会对原来已经存在数据库产生影响。

调试易

JSP读取内容乱码问题

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