EB开发乱码处理总结
在开发J2EE系统是，经常遇到jsp，数据库出现乱码问题，其解决方法分如下四个步骤：
1 首先检查jsp页面最上面的pageEncoding，将其设置为：GBK
<%@ page language="java" pageEncoding="GBK"%>
<%@ page contentType="text/html;charset=GBK"%>
2 我们开发工具用eclipse，检查ecpilpse的默认字体格式，方法是：
Project->Properties->Info 查看Text file encoding是否为GBK ，如果不是将其设置为GBK
3 给工程新建一个包，包名为filters，编写一个类SetCharacterEncodingFilter，次类在包filters里面
SetCharacterEncodingFilter实现Filter接口 ，该类的代码如下：
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;
public class SetCharacterEncodingFilter implements Filter {
protected String encoding = null ;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;
public void destroy() {
// TODO Auto-generated method stub
this.encoding = null ;
this.filterConfig = null ;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
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 {
// TODO Auto-generated method stub
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);
}
}
4 配置web.xml ,具体web.xml文件如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_2.xsd">
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>3</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>EncodingServlet</servlet-name>
<servlet-class>EncodingServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>EncodingServlet</servlet-name>
<url-pattern>/servlet/EncodingServlet</url-pattern>
</servlet-mapping>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-template.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-template.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
<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>
</web-app>
对于Java由于默认的编码方式是 UNICODE,所以用中文也易出问题,常见的解决是
String s2 = new String(s1.getBytes(“ISO-8859-1”),”GBK”);
1、utf8解决JSP中文乱码问题
一般说来在每个页面的开始处，加入：
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charset=UTF-8 的作用是指定JSP向客户端输出的编码方式为“UTF-8”
pageEncoding="UTF-8" 为了让JSP引擎能正确地解码含有中文字符的JSP页面，这在LINUX中很有效
request.setCharacterEncoding("UTF-8"); 是对请求进行了中文编码
有时，这样仍不能解决问题，还需要这样处理一下：
String msg = request.getParameter("message");
String str=new String(msg.getBytes("ISO-8859-1"),"UTF-8");
out.println(st);
2、Tomcat 5.5 中文乱码
1)只要把%TOMCAT安装目录%/ webapps/servlets-examples/WEB-INF/classes/filters/SetCharacterEncodingFilter.class文件拷到你的webapp目录/filters下，如果没有filters目录，就创建一个。
2)在你的web.xml里加入如下几行：
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3)完成.
2 get方式的解决办法
1) 打开tomcat的server.xml文件，找到区块，加入如下一行：
URIEncoding=”GBK”
完整的应如下：
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<CONNECTOR< p> 2)重启tomcat,一切OK。
3、xmlHttpRequest中文问题
页面jsp用的GBK编码
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后台java中获得的reportId是乱码，不知道该怎么转，主要是不知道xmlHttp.send(urlmsg);以后是什么编码?在后面用java来转，试了几种，都没有成功，其中有：
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