java之如何在页面中设置跳转编码JSP系列

发布于 2020-8-31 19:33
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在做JSP系统时经常遇到编码问题

并且该服务器可以是Tomcat,Weblogic,Tomcat服务器的默认编码为iso-8859-1,而Weblogic的默认编码为UTF-8,因此在程序运行时请注意编码设置

在做JSP系统时经常遇到的就是编码问题

而这个服务器可以是Tomcat、Weblogic,Tomcat服务器默认的编码为iso-8859-1,Weblogic默认的编码为UTF-8,所以程序运行时要注意编码设置

现在我们以一个jsp页面的代码,解释这些编码设置pageEncoding="UTF-8"说的是页面的编码,比如标题栏<title>还有其它内容等等

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">这代码说的是上下文编码,若我们设置charset="UTF-8",那我们在点击这个页面跳到的那个Servlet或者jsp页面就要用"request.setCharacterEncoding("UTF-8");"和"String newsbody = new String(request.getParameter("editorValue").getBytes("iso-8859-1"),"UTF-8");"意思是设置接收到的字符串编码为UTF-8,响应的编码设置,可以用response.setContentType("text/html;charset=UTF-8");

 

 


 

<%@page import="java.net.URLDecoder"%>
 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 
<%
 
String path = request.getContextPath();
 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 
%>
 
 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 
<html>
 
  <head>
 
    <base href="<%=basePath%>">
 
    
 
    <title>My JSP 'test.jsp' starting page</title>
 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 
 <meta http-equiv="pragma" content="no-cache">
 
 <meta http-equiv="cache-control" content="no-cache">
 
 <meta http-equiv="expires" content="0">    
 
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 
 <meta http-equiv="description" content="This is my page">
 
 <!--
 
 <link rel="stylesheet" type="text/css" href="styles.css">
 
 -->
 
 <style type="text/css">  
 
  .news {  
 
      width: 800px;  
 
      margin: 0 auto;  
 
  }  
 
</style>  
 
 
 
 
 
  </head>
 
  
 
  <body>
 
     <%  
 
        request.setCharacterEncoding("UTF-8"); 
 
        response.setContentType("text/html;charset=GBK");
 
       String newsbody = new String(request.getParameter("editorValue").getBytes("iso-8859-1"),"UTF-8");  
 
    %>  
 
  
 
    <div class="news">  
 
        <%=newsbody%>  
 
  
 
    </div>  
 
 
 
  </body>
 
</html>


 

 

 

 

String newsbody = new String(request.getParameter("editorValue").getBytes("iso-8859-1"),"UTF-8");  

 

给一个编码过滤器参考

 

 

import java.io.IOException;
import java.nio.charset.Charset;
 
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.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
 
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
/**
 * @description: 编码过滤器, 解决get或post方式的乱码问题
 */
@WebFilter(filterName = "encodingFilter", urlPatterns = "/*")
public class EncodingFilter implements Filter {
 
	private static final Logger logger = LoggerFactory.getLogger(EncodingFilter.class);
 
	private String encode = "UTF-8";// 默认编码集
	
    private String containers_encode="ISO8859-1";//web容器编码
	
	@Override
	public void destroy() {
		logger.info("====过滤器正在销毁====");
	}
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		if (httpRequest.getMethod().equals("POST")) {
			logger.debug("post请求,直接设置编码");
			// 直接设置编码
			request.setCharacterEncoding(encode);
		} else {
			// 重写HttpServletRequestWrapper进行内部转码
			logger.debug("get请求,尝试转码");
			request = new Request(httpRequest);
		}
		// 设置返回客户端编码
		response.setCharacterEncoding(encode);
		chain.doFilter(request, response);// 交替权利给下一个过滤器或servlet服务
	}
	class Request extends HttpServletRequestWrapper {
		/* 构造函数 */
		public Request(HttpServletRequest request) {
			super(request);
		}
		private HttpServletRequest getHttpServletRequest() {
			return (HttpServletRequest) super.getRequest();
		}
		/**
		 * 转换由表单读取的数据的内码
		 * 
		 * @param str
		 * @return
		 */
		private String changeEncode(String str) {
			if (needEncoding(str)) {
				try {
					byte[] bytes = str.getBytes(containers_encode);
					logger.debug("数据:{} 转码结果:{}", str,
							new String(bytes, encode));
					return new String(bytes, encode);
				} catch (Exception e) {
					e.printStackTrace();
				}
				return null;
			}
			return str;
		}
		/* 判断字符串是否需要转码 */
		private boolean needEncoding(String str) {
			/* 如果为汉字,则不需要转码 */
			return Charset.forName(containers_encode).newEncoder().canEncode(str);
		}
		@Override
		/* 单个参数 */
		public String getParameter(String arg) {
			String value = getHttpServletRequest().getParameter(arg);
			if (value != null) {
				return changeEncode(getHttpServletRequest().getParameter(arg));
			}
			return getHttpServletRequest().getParameter(arg);
		}
		@Override
		/* 多个参数 */
		public String[] getParameterValues(String arg) {
			String values[] = getHttpServletRequest().getParameterValues(arg);
			if (values != null) {
				for (int i = 0; i < values.length; i++) {
					values[i] = changeEncode(values[i]);
				}
			}
			return values;
		}
	}
	@Override
	public void init(FilterConfig config) throws ServletException {
		logger.debug("====编码过滤器启动====");
		/* 读取配置参数的编码集 */
		String encoding = config.getInitParameter("encode");
		if (StringUtils.isNotBlank(encoding)) {
			this.encode = encoding;
		}
	}
}

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已于2020-9-1 16:41:30修改
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