项目中常用处理乱码的手段
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2022-03-06 09:48:32
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1、jsp页面指定字符集
这个主要是处理页面显示的乱码问题
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Insert title here</title>
</head>
<body>
</body>
</html>
2、修改tomcat配置文件，tomcat根目录/conf/server.xml
修改Connector，添加URIEncoding="UTF-8" 属性，这个主要是处理get请求返回的数据。
<Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
3、web应用中添加filter过滤器
编写过滤器
EncodingFilter.java
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 EncodingFilter implements Filter {
protected String encoding = null;
protected FilterConfig filterConfig = null;
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
String encoding = selectEncoding(request);
if (encoding != null) {
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
}
protected String selectEncoding(ServletRequest request) {
return this.encoding;
}
}
web.xml中配置过滤器
<filter>
<filter-name>SetChartEncoding</filter-name>
<filter-class>com.hotels.common.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SetChartEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
4、response中返回header设置content-type=“utf-8”
// 在一个servlet 中 或者在spring的一个controller中
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String path = request.getContextPath();/// hotels
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
}
5、如果是spring项目，可以添加spring的字符集过滤器
web.xml
<!-- 字符集 --> <filter> <filter-name>characterEncoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>