1）JSP页面中显示中文乱码
在JSP文件中使用page命令指定响应结果的MIME类型，如<%@ page language="java" contentType="text/html;charset=gb2312" %>
2）表单提交乱码
表单提交时（post和Get方法），使用request.getParameter方法得到乱码，这是因为tomcat处理提交的参数时默认的是iso-8859-1，表单提交get和post处理乱码问题不同，下面分别说明。
(1)POST处理
对post提交的表单通过编写一个过滤器的方法来解决，过滤器在用户提交的数据被处理之前被调用，可以在这里改变参数的编码方式，过滤器的代码如下：
Java代码
package example.util;
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() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
<STRONG><SPAN style="COLOR: #ff0000"> FilterChain chain) throws
|IOException, ServletException {
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null) {
request.setCharacterEncoding(encoding);
}
}</SPAN>
</STRONG>
// Pass control on to the next filter
chain.doFilter(request, response);
}
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 String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
package example.util;
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() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
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 {
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 String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
文中红色的代码即为处理乱码的代码。
web.xml文件加入过滤器
Xml代码
<filter>
<filter-name>Encoding</filter-name>
<filter-class>
example.util.SetCharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>gbk</param-value>
<!--gbk或者gb2312或者utf-8-->
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter>
<filter-name>Encoding</filter-name>
<filter-class>
example.util.SetCharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>gbk</param-value>
<!--gbk或者gb2312或者utf-8-->
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>Xml代码
<filter-mapping>
<filter-name>Encoding</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>Encoding</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
(2) Get方法的处理
tomcat对post和get的处理方法不一样，所以过滤器不能解决get的乱码问题，它需要在其他地方设置。
打开<tomcat_home>\conf目录下server.xml文件，找到对8080端口进行服务的Connector组件的设置部分，给这个组件添加一个属性：URIEncoding="GBK"。修改后的Connector设置为：
Java代码
<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true"
<SPAN style="COLOR: #ff0000">URIEncoding="GBK"</SPAN> />
<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true"
URIEncoding="GBK" />
* 注意修改后重新启动tomcat才能起作用。
