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jsp字符编码过滤器的实现

2017-09-30 20:24 281 查看

1.新建一个Dynamic Web Project项目，里面新建1个filter文件和1个jsp文件，整体的框架如图所示：

2.SetCharacterEncodingFilter.java里面的代码如下所示：

package 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;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

@WebFilter(filterName = "setCharacterEncodingFilter", urlPatterns = { "/*" }, initParams = { @WebInitParam(name = "encoding", value = "utf-8") })
public class SetCharacterEncodingFilter implements Filter {

public static String encoding;

public void destroy() {
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
request.setCharacterEncoding(encoding);
chain.doFilter(request, response);
}

@Override
public void init(FilterConfig fConfig) throws ServletException {
encoding = fConfig.getInitParameter("encoding");
}

}

3.one.jsp里面的代码如下所示：
<%@page import="java.util.Date"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example</title>
</head>
<body>
<h2>Test</h2>
</body>
</html>

4.在浏览器里面输入http://localhost:8080/Servlet/one.jsp运行之后得到的结果如下所示：

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