JAVA WEB 中的编码分析
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JAVA WEB 中的编码分析
Table of Contents
1 常见编码格式的区别
1.1 为什么要编码
1.2 常见编码格式
2 需要编码的场景
2.1 磁盘IO
2.2 内存中
- 字符和字节之间的转换demo
- 内存字符占用字节数验证
2.3 网络IO
但是还是强烈的不建议使用操作系统的默认编码,因为这样,你的应用程序的编码格式就和运行环境绑定起来了,在跨环境下很可能出现乱码问题。
genesys sdk 的demo 示例,怎么来解决的?
2.4 java 中编解码的原理
2.4.1 编码类图
2.4.2 编码时序图
2.4.3 各种编码格式编码后的字节数组示例
3 JAVA WEB 中涉及的编码问题
3.1 HTTP请求中涉及到编码的地方
3.2 URL中的编码
- ServletPath和PathInfo中的中文
- QueryString中的中文
public void service(org.apache.coyote.Request req,
org.apache.coyote.Response res)
throws Exception { Request request = (Request) req.getNote(ADAPTER_NOTES);
Response response = (Response) res.getNote(ADAPTER_NOTES); if (request == null) { // Create objects
request = connector.createRequest();
request.setCoyoteRequest(req);
response = connector.createResponse();
response.setCoyoteResponse(res); // Link objects
request.setResponse(response);
response.setRequest(request); // Set as notes
req.setNote(ADAPTER_NOTES, request);
res.setNote(ADAPTER_NOTES, response); // Set query string encoding
req.getParameters().setQueryStringEncoding
(connector.getURIEncoding()); }
所以,结论是,queryStringEncoding编码的优先级是,第一是随contentType(设置了useBodyEncodingForURI),第二随URIEncoding(没有设置useBodyEncodingForURI),第三则是默认编码(即没有设置contentType,设置了useBodyEncodingForURI=true)
protected void parseParameters() { parametersParsed = true; Parameters parameters = coyoteRequest.getParameters();
boolean success = false;
try {
// Set this every time in case limit has been changed via JMX
parameters.setLimit(getConnector().getMaxParameterCount()); // getCharacterEncoding() may have been overridden to search for
// hidden form field containing request encoding
String enc = getCharacterEncoding(); boolean useBodyEncodingForURI = connector.getUseBodyEncodingForURI();
if (enc != null) {
parameters.setEncoding(enc);
if (useBodyEncodingForURI) {
parameters.setQueryStringEncoding(enc);
}
} else {
parameters.setEncoding
(org.apache.coyote.Constants.DEFAULT_CHARACTER_ENCODING);
if (useBodyEncodingForURI) {
parameters.setQueryStringEncoding
(org.apache.coyote.Constants.DEFAULT_CHARACTER_ENCODING);
}
}
<Connector executor="tomcatThreadPool" protocol="org.apache.coyote.http11.Http11NioProtocol"
port="" URIEncoding="UTF-8" useBodyEncodingForURI="true" compression="off" enableLookups="false"
maxKeepAliveRequests="" bufferSize="" connectionTimeout=""
redirectPort="" server="DPServer"/>
3.3 HTTP header 中的编码
3.4 POST 的编码
/**
* Get the character encoding used for this request.
*/
public String getCharacterEncoding() { if (charEncoding != null) {
return charEncoding;
} charEncoding = getCharsetFromContentType(getContentType());
return charEncoding; }