修改tomcat的conf/server.xml解决网页乱码

——后台

转码

str= new String(str.getBytes("iso8859-1"),"gb2312");
str= new String(str.getBytes("iso8859-1"),"GBK");

servlet中
response.setContentType("text/html; charset=GBK");

——前台
JSP中乱码
<%@ page language="java" contentType="text/html;charset=GBK" pageEncoding="GBK" %>

——服务器 tomcat中

更改 Tomcat\conf\server.xml，指定浏览器的编码格式为“简体中文”：
把
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
改成
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" URIEncoding="GBK"/>

——web.xml中添加一个过滤器

<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>com.worthtech.app.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

java 代码

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 CharacterEncodingFilter implements Filter {

private String encoding=null;
private boolean ignore=true;

public void destroy() {
// TODO Auto-generated method stub
encoding=null;
}

/**
* 过滤请求，用户提交请求时起作用
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
if(ignore||request.getCharacterEncoding()==null){
String encoding=getEncoding();
if(encoding!=null){
request.setCharacterEncoding(encoding);
}
}
// System.out.println("encoding===="+encoding);
response.setContentType("text/html;charset="+encoding);
// do something here
//当前工作全部完成后，将请求放开给过滤器链的下一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 getEncoding(){
return this.encoding;
}
}