JSP系列之页面跳转编码设置
【摘要】
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
<me...
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");
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<%@page import="java.net.URLDecoder"%>
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>My JSP 'test.jsp' starting page</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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<style type="text/css">
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.news {
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width: 800px;
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margin: 0 auto;
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}
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</style>
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</head>
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<body>
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<%
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request.setCharacterEncoding("UTF-8");
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response.setContentType("text/html;charset=GBK");
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String newsbody = new String(request.getParameter("editorValue").getBytes("iso-8859-1"),"UTF-8");
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%>
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<div class="news">
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<%=newsbody%>
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</div>
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</body>
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</html>
String newsbody = new String(request.getParameter("editorValue").getBytes("iso-8859-1"),"UTF-8");
给一个编码过滤器参考
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import java.io.IOException;
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import java.nio.charset.Charset;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.annotation.WebFilter;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequestWrapper;
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import org.apache.commons.lang.StringUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @description: 编码过滤器, 解决get或post方式的乱码问题
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*/
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@WebFilter(filterName = "encodingFilter", urlPatterns = "/*")
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public class EncodingFilter implements Filter {
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private static final Logger logger = LoggerFactory.getLogger(EncodingFilter.class);
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private String encode = "UTF-8";// 默认编码集
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private String containers_encode="ISO8859-1";//web容器编码
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@Override
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public void destroy() {
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logger.info("====过滤器正在销毁====");
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response,
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FilterChain chain) throws IOException, ServletException {
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HttpServletRequest httpRequest = (HttpServletRequest) request;
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if (httpRequest.getMethod().equals("POST")) {
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logger.debug("post请求,直接设置编码");
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// 直接设置编码
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request.setCharacterEncoding(encode);
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} else {
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// 重写HttpServletRequestWrapper进行内部转码
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logger.debug("get请求,尝试转码");
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request = new Request(httpRequest);
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}
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// 设置返回客户端编码
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response.setCharacterEncoding(encode);
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chain.doFilter(request, response);// 交替权利给下一个过滤器或servlet服务
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}
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class Request extends HttpServletRequestWrapper {
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/* 构造函数 */
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public Request(HttpServletRequest request) {
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super(request);
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}
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private HttpServletRequest getHttpServletRequest() {
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return (HttpServletRequest) super.getRequest();
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}
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/**
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* 转换由表单读取的数据的内码
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*
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* @param str
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* @return
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*/
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private String changeEncode(String str) {
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if (needEncoding(str)) {
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try {
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byte[] bytes = str.getBytes(containers_encode);
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logger.debug("数据:{} 转码结果:{}", str,
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new String(bytes, encode));
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return new String(bytes, encode);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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return str;
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}
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/* 判断字符串是否需要转码 */
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private boolean needEncoding(String str) {
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/* 如果为汉字，则不需要转码 */
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return Charset.forName(containers_encode).newEncoder().canEncode(str);
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}
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@Override
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/* 单个参数 */
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public String getParameter(String arg) {
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String value = getHttpServletRequest().getParameter(arg);
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if (value != null) {
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return changeEncode(getHttpServletRequest().getParameter(arg));
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}
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return getHttpServletRequest().getParameter(arg);
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}
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@Override
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/* 多个参数 */
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public String[] getParameterValues(String arg) {
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String values[] = getHttpServletRequest().getParameterValues(arg);
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if (values != null) {
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for (int i = 0; i < values.length; i++) {
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values[i] = changeEncode(values[i]);
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}
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}
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return values;
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}
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}
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@Override
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public void init(FilterConfig config) throws ServletException {
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logger.debug("====编码过滤器启动====");
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/* 读取配置参数的编码集 */
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String encoding = config.getInitParameter("encode");
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if (StringUtils.isNotBlank(encoding)) {
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this.encode = encoding;
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}
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}
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}
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文章来源: smilenicky.blog.csdn.net，作者：smileNicky，版权归原作者所有，如需转载，请联系作者。
原文链接：smilenicky.blog.csdn.net/article/details/51108324
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