我目前正在开发一个Java WebService项目。
想象一下，我有这个课程：
@XmlRootElement
public class person{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
所以，我的Request对象看起来像是：
<person>
<name>Something</name>
</person>
但我希望与之合作：
<PERSON>
<NAME>Something</NAME>
</PERSON>
，即不区分大小写。
我知道这个问题已经由几个人提出。 用于回答此问题的链接是：
http://blog.bdoughan.com/2010/12/case-insensitive-unmarshalling.html
这篇文章有几年（+ 5年），所以我不知道是否有一个特殊的注释用于此目的，如：
@XmlElement(lower-case(name="No matter what you InTroDuCe i allways be introduce"))
public String getName() {
return name;
}
修改
我提供的链接获取.xml文件。我不想使用XML文件，因为我需要编组y请求Java对象到XML。所以我的问题是：
可以使用Filter类并将我的HttpServletRequest更改为小写，还是有更好的方法？
我的过滤器类（由Netbeans生成）：
public class NewFilter implements Filter {
private static final boolean debug = true;
// The filter configuration object we are associated with. If
// this value is null, this filter instance is not currently
// configured.
private FilterConfig filterConfig = null;
public NewFilter() {
}
private void doBeforeProcessing(ServletRequest request, ServletResponse response)
throws IOException, ServletException {
if (debug) {
log("NewFilter:DoBeforeProcessing");
}
// Write code here to process the request and/or response before
// the rest of the filter chain is invoked.
// For example, a logging filter might log items on the request object,
// such as the parameters.
/*
for (Enumeration en = request.getParameterNames(); en.hasMoreElements(); ) {
String name = (String)en.nextElement();
String values[] = request.getParameterValues(name);
int n = values.length;
StringBuffer buf = new StringBuffer();
buf.append(name);
buf.append("=");
for(int i=0; i < n; i++) {
buf.append(values[i]);
if (i < n-1)
buf.append(",");
}
log(buf.toString());
}
*/
}
private void doAfterProcessing(ServletRequest request, ServletResponse response)
throws IOException, ServletException {
if (debug) {
log("NewFilter:DoAfterProcessing");
}
// Write code here to process the request and/or response after
// the rest of the filter chain is invoked.
// For example, a logging filter might log the attributes on the
// request object after the request has been processed.
/*
for (Enumeration en = request.getAttributeNames(); en.hasMoreElements(); ) {
String name = (String)en.nextElement();
Object value = request.getAttribute(name);
log("attribute: " + name + "=" + value.toString());
}
*/
// For example, a filter might append something to the response.
/*
PrintWriter respOut = new PrintWriter(response.getWriter());
respOut.println("<P><B>This has been appended by an intrusive filter.</B>");
*/
}
/**
*
* @param request The servlet request we are processing
* @param response 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 {
if (debug) {
log("NewFilter:doFilter()");
}
doBeforeProcessing(request, response);
Throwable problem = null;
try {
chain.doFilter(request, response);
} catch (Throwable t) {
// If an exception is thrown somewhere down the filter chain,
// we still want to execute our after processing, and then
// rethrow the problem after that.
problem = t;
t.printStackTrace();
}
doAfterProcessing(request, response);
// If there was a problem, we want to rethrow it if it is
// a known type, otherwise log it.
if (problem != null) {
if (problem instanceof ServletException) {
throw (ServletException) problem;
}
if (problem instanceof IOException) {
throw (IOException) problem;
}
sendProcessingError(problem, response);
}
}
/**
* Return the filter configuration object for this filter.
*/
public FilterConfig getFilterConfig() {
return (this.filterConfig);
}
/**
* Set the filter configuration object for this filter.
*
* @param filterConfig The filter configuration object
*/
public void setFilterConfig(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
}
/**
* Destroy method for this filter
*/
public void destroy() {
}
/**
* Init method for this filter
*/
public void init(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
if (filterConfig != null) {
if (debug) {
log("NewFilter:Initializing filter");
}
}
}
/**
* Return a String representation of this object.
*/
@Override
public String toString() {
if (filterConfig == null) {
return ("NewFilter()");
}
StringBuffer sb = new StringBuffer("NewFilter(");
sb.append(filterConfig);
sb.append(")");
return (sb.toString());
}
private void sendProcessingError(Throwable t, ServletResponse response) {
String stackTrace = getStackTrace(t);
if (stackTrace != null && !stackTrace.equals("")) {
try {
response.setContentType("text/html");
PrintStream ps = new PrintStream(response.getOutputStream());
PrintWriter pw = new PrintWriter(ps);
pw.print("<html>\n<head>\n<title>Error</title>\n</head>\n<body>\n"); //NOI18N
// PENDING! Localize this for next official release
pw.print("<h1>The resource did not process correctly</h1>\n<pre>\n");
pw.print(stackTrace);
pw.print("</pre></body>\n</html>"); //NOI18N
pw.close();
ps.close();
response.getOutputStream().close();
} catch (Exception ex) {
}
} else {
try {
PrintStream ps = new PrintStream(response.getOutputStream());
t.printStackTrace(ps);
ps.close();
response.getOutputStream().close();
} catch (Exception ex) {
}
}
}
public static String getStackTrace(Throwable t) {
String stackTrace = null;
try {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
t.printStackTrace(pw);
pw.close();
sw.close();
stackTrace = sw.getBuffer().toString();
} catch (Exception ex) {
}
return stackTrace;
}
public void log(String msg) {
filterConfig.getServletContext().log(msg);
}
}
编辑2：
使用@Kenneth Clark的帮助，我做了：
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
if (debug) {
log("NewFilter:doFilter()");
}
doBeforeProcessing(request, response);
Throwable problem = null;
try {
final HttpServletRequestWrapper wrapped = new HttpServletRequestWrapper((HttpServletRequest) request) {
public String toLowerCase() {
StringBuffer jb = new StringBuffer();
String line = null;
try {
BufferedReader reader = request.getReader();
while ((line = reader.readLine()) != null) {
jb.append(line);
}
} catch (Exception e) { /*report an error*/ }
return jb.toString().toLowerCase();
}
};
chain.doFilter(wrapped, response);
} catch (IOException | ServletException t) {
// If an exception is thrown somewhere down the filter chain,
// we still want to execute our after processing, and then
// rethrow the problem after that.
problem = t;
}
doAfterProcessing(request, response);
// If there was a problem, we want to rethrow it if it is
// a known type, otherwise log it.
if (problem
!= null) {
if (problem instanceof ServletException) {
throw (ServletException) problem;
}
if (problem instanceof IOException) {
throw (IOException) problem;
}
sendProcessingError(problem, response);
}
}
但我仍然没有要求降低案件。我做错了什么？
答案 0 :(得分：1)
要阅读HttpServletRequest的内容，您可以执行以下操作，
StringBuffer stringBuffer = new StringBuffer();
String line = null;
try {
BufferedReader reader = httpServletRequest.getReader();
while ((line = reader.readLine()) != null) {
stringBuffer.append(line);
}
} catch (Exception e) { e.printStackTrace(); /// Do something with this }
然后，您可以调用包含XSL变通方法的方法来执行转换
String transformedXML = transformTheXmlString(stringBuffer.toString());
以下是XSL解决方法，下面的示例将低级大写转换为大写
<xsl:element name="{translate(local-name(),$lcase,$ucase)}">
翻转$ lcase，$ ucase切换案例
public class Transform {
public static void main(String[] args) throws TransformerException {
String inXMl = "<test>CamelCase</test>";
StringWriter writer = new StringWriter();
String inputXSLFile = "C:\\text.xsl";
TransformerFactory factory = TransformerFactory.newInstance();
StreamSource xslStream = new StreamSource(new File(inputXSLFile));
Transformer transformer = factory.newTransformer(xslStream);
StreamSource in = new StreamSource(new StringReader(inXMl));
StreamResult out = new StreamResult(writer);
transformer.transform(in, out);
System.out.println(writer.toString());
}
}
从XSL字符串转换
public class Transform {
public static void main(String[] args) throws TransformerException {
String inXMl = "<test>CamelCase</test>";
StringWriter writer = new StringWriter();
String inputXSL = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n" +
"<xsl:stylesheet version=\"1.0\"\n" +
" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">\n" +
" <xsl:variable\n" +
" name=\"lcase\">abcdefghijklmnopqrstuvwxyz\n" +
" </xsl:variable>\n" +
" <xsl:variable\n" +
" name=\"ucase\">ABCDEFGHIJKLMNOPQRSTUVWXYZ\n" +
" </xsl:variable>\n" +
"\n" +
" <xsl:template match=\"@*|node()\">\n" +
" <xsl:copy>\n" +
" <xsl:apply-templates select=\"@*|node()\"/>\n" +
" </xsl:copy>\n" +
" </xsl:template>\n" +
" <xsl:template match=\"*\">\n" +
" <xsl:element name=\"{translate(local-name(),$lcase,$ucase)}\">\n" +
" <xsl:apply-templates select=\"@*|node()\"/>\n" +
" </xsl:element>\n" +
" </xsl:template>\n" +
"</xsl:stylesheet>";
TransformerFactory factory = TransformerFactory.newInstance();
StreamSource xslStream = new StreamSource(new StringReader(inputXSL));
Transformer transformer = factory.newTransformer(xslStream);
StreamSource in = new StreamSource(new StringReader(inXMl));
StreamResult out = new StreamResult(writer);
transformer.transform(in, out);
System.out.println(writer.toString());
}
}
<强> XSL
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable
name="lcase">abcdefghijklmnopqrstuvwxyz
</xsl:variable>
<xsl:variable
name="ucase">ABCDEFGHIJKLMNOPQRSTUVWXYZ
</xsl:variable>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{translate(local-name(),$lcase,$ucase)}">
<xsl:apply-templates select="@*|node()"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
XSL Exerpt from： http://helpdesk.objects.com.au/java/how-to-convert-all-xml-element-names-to-lower-case
答案 1 :(得分：0)
您可以通过一些解决方法实现此目的：在小写中映射所有您的节点名称属性，并创建自己的XMLStreamReader包装程序，调用{{1}在它返回的所有属性/元素名称上。