问题：
在你所有页面设置的编码都是utf-8的情况下仍然会出现中文乱码现象。
一、乱码出现原因
由于Struts框架直接把表单数据发送给了ActionForm，所以这里面没有对HttpRequestServlet进行SetCharacterEncoding,所以默认是按照ISO-8859-1。
二、解决办法
方法 ： 就是在表单提交到ActionForm之前对request进行编码,写一个过滤器，对所有请求进行过滤
方式一：直接在过滤器中指定编码格式
MyFilter.java
public class MyFilter extends HttpServlet implements Filter {
private static final long serialVersionUID = 1L;
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException {
// TODO Auto-generated method stub
arg0.setCharacterEncoding("utf-8"); //设置接收编码
arg1.setContentType("text/html;charset=utf-8");
arg2.doFilter(arg0, arg1); //必须
}
public void init(FilterConfig arg0) throws javax.servlet.ServletException {
// TODO Auto-generated method stub
}
}
在web.xml中添加
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>com.xidian.filter.MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
方式二：在web.xml中指定编码格式
MyFilter.java
package com.xidian.filter; import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet; public class MyFilter extends HttpServlet implements Filter {
private static final long serialVersionUID = 1L;
private String encoding; public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException {
// TODO Auto-generated method stub
arg0.setCharacterEncoding(encoding);
arg2.doFilter(arg0, arg1);
} public void init(FilterConfig arg0) throws javax.servlet.ServletException {
// TODO Auto-generated method stub
encoding=arg0.getInitParameter("encoding");
} }
在web.xml添加
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>com.xidian.filter.MyFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
下面是struts2中中文乱码的问题：
顺带再说下加上对输入数据内容的过滤的情况：
再添加一个过滤程序：
SafeFilter.java
package com.xidian.filter; 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 SafeFilter implements Filter {
private String keywords[]; public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
//这里我们接收到用户名
String name=request.getParameter("name");
request.setAttribute("err", "您不允许登录<font color='red'>"+name+"</font>");
System.out.println("第二个过滤器："+name);
if(name!=null){
//判断
for(String key:keywords){
if(key.equals(name)){
request.getRequestDispatcher("WEB-INF/ifo.jsp").forward(request, response);
return;
}
} }
chain.doFilter(request, response);
} public void init(FilterConfig filterConfig) throws ServletException {
keywords=filterConfig.getInitParameter("keywords").split(";"); } }
web.xml的配置
<!-- 部署过滤器的顺序就是执行的顺序 -->
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>com.xidian.filter.MyFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter> <filter>
<filter-name>SafeFilter</filter-name>
<filter-class>com.xidian.filter.SafeFilter</filter-class>
<init-param>
<param-name>keywords</param-name>
<param-value>拉登;小明;凤姐</param-value>
</init-param>
</filter>