解决jspstruts处理中文乱码问题的方法
一、关于jsp处理中文乱码的问题
在web.xml中设置正确的编码类型,使网页在发送表单时不会出现中文乱码。
/*
* 解决中文乱码问题,该类必须在web.xml设置,指定编码类型
*/
package com.login.app;
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;
/**
* Take this filter out of service.
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
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 String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
参照tomcat自带的filter类,自己写一个filter的子类,用来设置编码。并在web.xml上指定就可以了:
<!--filer in Chinese-->
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>com.login.app.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value><!—在此处设置相应的编码à
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
把以上代码放在web.xml中<display-name>Encoding Application</display-name>的后面.
二、在struts中处理中文乱码问题:
要解决在提交表单时,中文不会出显乱码,只须继承RequestProcessor类,重写processPreprocess这个方法,则可以解决。
package com.login.app;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.RequestProcessor;
public class MyRequestProcessor extends RequestProcessor{
public MyRequestProcessor(){}
protected boolean processPreprocess(HttpServletRequest request,
HttpServletResponse response){
try{
request.setCharacterEncoding("UTF-8");//在此设置字符集
}
catch(Exception ex){
System.out.println("字符集设置失败");
}
return true;
}
}
并在struts-config.xml设置相应的<controller>,如下所示:
<controller processorClass="com.login.app.MyRequestProcessor"/>
三、解决插入和读取数据库数据时出现的中文乱码
插入数据到数据库时出现乱码:
这种乱码会使你插入数据库的中文变成乱码,或者读出显示时也是乱码,解决方法如下:
在数据库连接字符串中加入编码字符集
String url=”jdbc:mysql://localhost/test?user=root&password=root&useUnicode=true&characterEncoding=UTF-8"
把characterEncoding的值设置成你期望的编码。
无论你是用哪种方式连接数据库,只要在url后面加上useUnicode=true&characterEncoding=UTF-8"就可以解决中文乱码问题,当然你提交的数据编码也必须是UTF-8的,总而言之,在构造一个网站,整个网站必须采用统一的编码。支持中文的编码有GBK,gb2312,UTF-8等。
例如在struts中利用数据源连接数据库,必须在struts-config.xml做如下配置:
<data-sources>
<!-- 设置数据源标识 -->
<data-source key="mysqlDB1" type="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
<!-- 设置数据库驱动对应类名 -->
<set-property property="driverClassName" value="org.gjt.mm.mysql.Driver"/>
<!-- 设置待连接数据源URL -->
<set-property property="url" value="jdbc:mysql://localhost/firststruts?useUnicode=true&charact erEncoding=UTF-8"/>
<!-- 设置同时打开连接的最大数目 -->
<set-property property="maxActive" value="5"/>
<!-- 设置登录数据库服务器用户名及密码 -->
<set-property property="username" value="root"/>
<set-property property="password" value=""/>
<!-- 设置事务处理中的自动提交 -->
<set-property property="autoCommit" value="true"/>
</data-source>
</data-sources>
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