JSP乱码笔记整理-希望对大家有所帮助

ゞ浴缸里的玫瑰 2022-10-02 05:45 103阅读 0赞

java web 中的乱码解决笔记

by rc

1.-------------------------------  
jsp页面乱码  
确保保存的文件内容为UTF-8编码格式  
解决：<%@ pageEncoding="utf-8" %>  
2.-------------------------------  
调用servlet页面显示乱码  
使用response对内容输出之前，  
设定内容的编码为utf-8  
解决：执行response.setContentType("text/html;charset=utf-8");  
3.-------------------------------  
post提交表单传递参数乱码  
jsp、html或 servlet的表单元素提交参数给对应的jsp页面或servlet，jsp页面或servlet接收的中文参数值乱码  
在接收参数之前设定接受参数的内容使用utf-8编码  
解决：1.request.setCharaterEncoding("utf-8");  
2.使用过滤器，接收参数之前，设定传递参数的内容编码为utf-8（代码附于文后）  
4.-------------------------------  
get方式传递参数乱码（表单post、链接方式）  
server.xml中修改<Connetctor port="8080" protocol="HTTP/1.1" maxThreads="150" connectctionTimeout="20000"

redirectPort="8443"/>添加 URIEncoding="UTF-8"  
解决：<Connetctor port="8080" protocol="HTTP/1.1" maxThreads="150" connectctionTimeout="20000" redirectPort="8443"

URIEncoding="UTF-8"/>

\---代码---------web.xml----------------  
<filter>  
<filter-name>CharacterEncodingFilter</filter-name>  
<filter-class>filter.CharacterEncodingFilter</filter-class>  
<init-param>  
<param-name>encoding</param-name>  
<param-value>UTF-8</param-value>  
</init-param>  
</filter>  
  
  
<filter-mapping>  
<filter-name>CharacterEncodingFilter</filter-name>  
<url-pattern>/\*</url-pattern>  
</filter-mapping>  
\--------filter.CharacterEncodingFilter-------  
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;

/\*  
\* Licensed to the Apache Software Foundation (ASF) under one or more  
\* contributor license agreements. See the NOTICE file distributed with  
\* this work for additional information regarding copyright ownership.  
\* The ASF licenses this file to You under the Apache License, Version 2.0  
\* (the "License"); you may not use this file except in compliance with  
\* the License. You may obtain a copy of the License at  
\*  
\* [http://www.apache.org/licenses/LICENSE-2.0][http_www.apache.org_licenses_LICENSE-2.0]  
\*  
\* Unless required by applicable law or agreed to in writing, software  
\* distributed under the License is distributed on an "AS IS" BASIS,  
\* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  
\* See the License for the specific language governing permissions and  
\* limitations under the License.  
\*/

public class CharacterEncodingFilter implements Filter \{  
// ----------------------------------------------------- Instance Variables

/\*\*  
\* The default character encoding to set for requests that pass through  
\* this filter.  
\*/  
protected String encoding = null;

/\*\*  
\* The filter configuration object we are associated with. If this value  
\* is null, this filter instance is not currently configured.  
\*/  
protected FilterConfig filterConfig = null;

/\*\*  
\* Should a character encoding specified by the client be ignored?  
\*/  
protected boolean ignore = true;

// --------------------------------------------------------- Public Methods

/\*\*  
\* Take this filter out of service.  
\*/  
public void destroy() \{

this.encoding = null;  
this.filterConfig = null;

/\*\*  
\* Select and set (if specified) the character encoding to be used to  
\* interpret request parameters for this request.  
\*  
\* @param request The servlet request we are processing  
\* @param result The servlet response we are creating  
\* @param chain The filter chain we are processing  
\*  
\* @exception IOException if an input/output error occurs  
\* @exception ServletException if a servlet error occurs  
\*/  
public void doFilter(ServletRequest request, ServletResponse response,  
FilterChain chain)  
throws IOException, ServletException \{

// Conditionally select and set the character encoding to be used  
if (ignore || (request.getCharacterEncoding() == null)) \{  
String encoding = selectEncoding(request);  
if (encoding != null)  
request.setCharacterEncoding(encoding);  
\}

// Pass control on to the next filter  
chain.doFilter(request, response);

/\*\*  
\* Place this filter into service.  
\*  
\* @param filterConfig The filter configuration object  
\*/  
public void init(FilterConfig filterConfig) throws ServletException \{

this.filterConfig = filterConfig;  
this.encoding = filterConfig.getInitParameter("encoding");  
String value = filterConfig.getInitParameter("ignore");  
if (value == null)  
this.ignore = true;  
else if (value.equalsIgnoreCase("true"))  
this.ignore = true;  
else if (value.equalsIgnoreCase("yes"))  
this.ignore = true;  
else  
this.ignore = false;

// ------------------------------------------------------ Protected Methods

/\*\*  
\* Select an appropriate character encoding to be used, based on the  
\* characteristics of the current request and/or filter initialization  
\* parameters. If no character encoding should be set, return  
\* <code>null</code>.  
\* <p>  
\* The default implementation unconditionally returns the value configured  
\* by the <strong>encoding</strong> initialization parameter for this  
\* filter.  
\*  
\* @param request The servlet request we are processing  
\*/  
protected String selectEncoding(ServletRequest request) \{

return (this.encoding);

\}  
\}

转载于:https://blog.51cto.com/robinc/232758

[http_www.apache.org_licenses_LICENSE-2.0]: http://www.apache.org/licenses/LICENSE-2.0