JAVA常见中文问题的解决方法
以下解决方案是笔者在日常生活中遇到的,希望能对你解决JAVA中文问题有所帮助。
1.在jsp页面首部加上<%@page contentType=”text/html;charset=GB2312“%>
在servlet中使用httpServlerResponse.setContentTpye(“text/html; charset=GB2312”);可以避免一些中文问题
2.使用JDBC连接mysql数据库时,连接字符串写成如下形式可以避免一些中文问题:
jdbc://mysql://hostname:port/DBname?user=username&password=pwd&
useUnicode=true&characterEncoding= iso-8859-1
如果是以数据源的方式连接数据库在配置文件中使用:
<parameter>
<name>url</name>
<value>jdbc:mysql://hostname:port/DBname? &useUnicode=true&characterEncoding=iso-8859-1</value>
</parameter>
注意要使用&替换&符号,否则XML文件在解析的时候会出错。
3.从数据库读出的数据有可能是乱码,遇到这种问题可以用如下方法解决:
String desc = rs.getString(“desc”);
desc = new String(desc.getBytes(“ISO-8859-1”),”GB2312”);
4.某个页面提交中文内容给Servlet,Servlet要对提交的内容进行转码工作才能正确接收数据,
通常我们是在servlet中增加以下代码来解决问题。
httpServlerRequest.setCharacterEncoding(“GB2312”);
5. 在struts中,对资源文件进行转码,使用JDK字带的转码工具:
>native2ascii -encoding BG2312 Myresource.properties Myresource_zh.properties
6.在struts中扩展org.apache.struts.action.RequestProcessor类,并覆写其中的processPreprocess()方法:
package com.mypro.action;
public class MyProRequestProcessor extends RequestProcessor
{
protected boolean processPreprocess (HttpServletRequest request,
HttpServletResponse response)
{
try
{
request.setCharacterEncoding(“GB2312”);
//other code
}
catch(Exception e){}
return true;
}
}
写完上面代码别忘了修改struts-config.xml:
<controller processorClass=” com.mypro.action.MyProRequestProcessor”/>
7. 用filter实现(推荐)
package com.kefeiannan;
import java.io.IOException;
import javax.servlet.*;
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);
}
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);
}
}
配置你站点下的web.xml,在<web-app>后面加上
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>com.kefeiannan.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>