JSPの文字コード関連のメモ
Webブラウザが文字コードを判定する基準は？：Javaの文字化け対策FAQ（1） - ＠IT
pageEncoding属性を見て無ければcharset属性を見る。
確かにTomcatでもそうなっているみたい。ただ4系と6系では結構違うみたい。
- Tomcat6系
/* * Determines page source encoding for page or tag file in JSP syntax, * by reading (in this order) the value of the 'pageEncoding' page * directive attribute, or the charset value of the 'contentType' page * directive attribute. * * @return The page encoding, or null if not found */ private String getPageEncodingForJspSyntax(JspReader jspReader, Mark startMark) throws JasperException { String encoding = null; String saveEncoding = null; jspReader.reset(startMark); /* * Determine page encoding from directive of the form <%@ page %>, * <%@ tag %>, <jsp:directive.page > or <jsp:directive.tag >. */ while (true) { if (jspReader.skipUntil("<") == null) { break; } // If this is a comment, skip until its end if (jspReader.matches("%--")) { if (jspReader.skipUntil("--%>") == null) { // error will be caught in Parser break; } continue; } boolean isDirective = jspReader.matches("%@"); if (isDirective) { jspReader.skipSpaces(); } else { isDirective = jspReader.matches("jsp:directive."); } if (!isDirective) { continue; } // compare for "tag ", so we don't match "taglib" if (jspReader.matches("tag ") || jspReader.matches("page")) { jspReader.skipSpaces(); Attributes attrs = Parser.parseAttributes(this, jspReader); encoding = getPageEncodingFromDirective(attrs, "pageEncoding"); if (encoding != null) { break; } encoding = getPageEncodingFromDirective(attrs, "contentType"); if (encoding != null) { saveEncoding = encoding; } } } if (encoding == null) { encoding = saveEncoding; } return encoding; }
- Tomcat4系
//********************************************************************* // Figure out input Document private void figureOutJspDocument(String file, String encoding, InputStreamReader reader) throws JasperException { JspReader jspReader; try { jspReader = new JspReader(ctxt, file, encoding, reader, compiler.getErrorDispatcher()); } catch (FileNotFoundException ex) { throw new JasperException(ex); } jspReader.setSingleFile(true); Mark startMark = jspReader.mark(); // Check for the jsp:root tag // No check for xml prolog, since nothing prevents a page // to output XML and still use JSP syntax. jspReader.reset(startMark); Mark mark = jspReader.skipUntil(JSP_ROOT_TAG); if (mark != null) { isXml = true; } else { isXml = false; } newEncoding = null; String pageEncoding = null; // Figure out the encoding of the page // xml parser will take care of encoding for // page in XML syntax since we pass it a stream if (!isXml) { jspReader.reset(startMark); while (jspReader.skipUntil("<%@") != null) { jspReader.skipSpaces(); if (jspReader.matches("page")) { jspReader.skipSpaces(); Attributes attrs = Parser.parseAttributes(this, jspReader); pageEncoding = attrs.getValue("pageEncoding"); if (pageEncoding == null) { String contentType = attrs.getValue("contentType"); if (contentType != null) { int loc = contentType.indexOf("charset="); if (loc != -1) { newEncoding = contentType.substring(loc+8); } } } else { newEncoding = pageEncoding; return; } } } } }
