struts2 中文乱码的解决办法分享

2019-11-26 15:42:37

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适合情况 -> 从jsp传入到action时的乱码情况,这里以GBK为例

1.建立一个用于转换编码的filter
文件位置举例:src.util.SetCharacterEncodingFilter.java

package 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;
import javax.servlet.UnavailableException;

/**
* Example filter that sets the character encoding to be used in parsing the
* incoming request
*/
public class SetCharacterEncodingFilter implements Filter {

    /**
     * Take this filter out of service.
     */
    public void destroy() {
    }
    /**
     * Select and set (if specified) the character encoding to be used to
     * interpret request parameters for this request.
     */
    public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain)throws IOException, ServletException {

request.setCharacterEncoding("gbk");

    // 传递控制到下一个过滤器
    chain.doFilter(request, response);
    }

public void init(FilterConfig filterConfig) throws ServletException {
}
}

2.修改web.xml,在struts的FilterDispatcher映射之前添加2个filter

复制代码代码如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
    <filter>
  <filter-name>Set Character Encoding</filter-name> 
  <filter-class>util.SetCharacterEncodingFilter</filter-class> 
 </filter> 
 <filter-mapping> 
     <filter-name>Set Character Encoding</filter-name>
     <url-pattern>/*</url-pattern> 
 </filter-mapping>

    <filter> 
        <filter-name>struts-cleanup</filter-name> 
        <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class> 
    </filter>
    <filter-mapping>
        <filter-name>struts-cleanup</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    

    
 <filter>
  <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
 </filter>
  <filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
</web-app>

3.你的JSP头应该有
<%@ page language="java" pageEncoding="GBK"%>

4.在struts.xml中修改默认的编码设定

复制代码代码如下:

...
...
...

</struts>

基本上就这样可以解决大多传入的字符乱码问题

PS:如果是数据库提取字符乱码,比如mysql,确认你的数据库内字符是gbk,并且连接字符串指定了字符编码
<property name="url" value="jdbc:mysql://localhost/database?useUnicode=true&characterEncoding=gbk"></property>

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