应用开发笔记
0%

jsp:include使用方法及中文参数乱码的解决

发表于 更新于 分类于

下面的例子是1.jsp包含index.jsp，并向index.jsp传递参数，index.jsp接收参数并显示. 1.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP '1.jsp' starting page</title>
</head>

<body>
    <jsp:include page="index.jsp">
        <jsp:param value="我是中文" name="param" />
    </jsp:include>
</body>
</html>

index.jsp接收参数:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String param=request.getParameter("param");
    out.println(param);
 %>

运行时发现，即使两个文件的Encoding都是UTF-8,中文还是显示乱码。解决方法:增加一个过滤器，把ServletRequest的编码转换成UTF-8. 新建一个类EncodeFilter，实现javax.servlet.Filter接口：

package pocketdigi;

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 EncodeFilter implements Filter {
    private FilterConfig filterConfig;
    private String encode;
    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        filterConfig=null;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain filterChain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding(encode);
        //设置编码
        filterChain.doFilter(request, response);
        //调用FilterChain中的下一个过滤器，如果这是最后一个过滤器，调用请求的资源
        //过滤器是在传送参数之后，被接收到之前调用的
        
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        this.filterConfig = filterConfig;
        encode=filterConfig.getInitParameter("Encode");
        //读取web.xml中配置的参数
    }

}

在web.xml中还需要配置过滤器：

  <filter>
      <filter-name>EncodeFilter</filter-name>
      <filter-class>pocketdigi.EncodeFilter</filter-class>
      <init-param>
          <param-name>Encode</param-name>
          <param-value>UTF-8</param-value>
          <!-- 设置参数，在过滤器中读取 -->
      </init-param>
  </filter>
  <filter-mapping>
          <filter-name>EncodeFilter</filter-name>
          <url-pattern>/*</url-pattern>
          <!-- /是相对该项目而言，并非站点根目录，这里过滤该对项目所有jsp和servlet请求 -->
  </filter-mapping>