基于过滤器的中文乱码解决

最新推荐文章于 2021-05-02 20:16:46 发布

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最新推荐文章于 2021-05-02 20:16:46 发布

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本文链接：https://blog.youkuaiyun.com/qq_43501944/article/details/103045293

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本文介绍了一种通过设计过滤器解决POST提交方式下参数值中文乱码问题的方法。利用filter统一设置字符编码，避免了在每个servlet中重复设置，简化了代码，确保了中文字符的正确处理。

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设计一个过滤器统一处理Post提交方式下参数值中文乱码问题。

1、index.jsp

<form action="servlet1" method="post">
输入姓名:<input type="text" name="name">
<input type="submit" value="提交">

</form>
<form action="servlet2" method="post">
输入爱好:<input type="text" name="hobby">
<input type="submit" value="提交">
</form>

2、servlet
com.servlets.Servlet1

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//request.setCharacterEncoding("utf-8");
		System.out.println(request.getParameter("name"));
}

com.servlets.Servlet2:

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//request.setCharacterEncoding("utf-8");
		System.out.println(request.getParameter("hobby"));
	}

3、filter
com.filters.Filter

public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		// TODO Auto-generated method stub
		System.out.println("请求过滤...");
		arg0.setCharacterEncoding("utf-8");
		arg2.doFilter(arg0, arg1);
		System.out.println("响应过滤");
}

4、filter配置

<filter>
	<filter-name>filter</filter-name>
	<filter-class>com.filters.Filter</filter-class>
</filter>
<filter-mapping>
	<filter-name>filter</filter-name>
	<url-pattern>/servlet1</url-pattern>
</filter-mapping>
<filter-mapping>
	<filter-name>filter</filter-name>
	<url-pattern>/servlet2</url-pattern>
</filter-mapping>

**该程序中有两个servlet，在配置时可用 * 全选。**以上filter配置代码可以换成：

<filter>
	<filter-name>filter</filter-name>
	<filter-class>com.filters.Filter</filter-class>
</filter>
<filter-mapping>
	<filter-name>filter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>